# Questions Asked onApril 18, 2013

1. ## Chemistry - molecular polarity

Hi Dr. Bob. Could you please take a look at the question below and my work? I'm not sure how to get the correct answer for this question. I would greatly appreciate your help! How many of the following molecules are polar? BrCl3 CS2 SiF4 SO3 A) 1 B) 2 C) 3

2. ## chemistry

Consider the following reaction: I2(g) + Cl2(g) 2ICl(g) o Kp = 81.9 at 25 C. Calculate ∆Grxn for the reaction at 25 C under each of the following conditions: a Standard conditions. b At equilibrium. c PICl = 2.55 atm; PI2 = 0.325 atm; PCl2 = 0.221 atm.

3. ## MATH

Sam is 5 years old. His older brother, Tom, is three times as old as Sam. When Sam is 20, how old will Tom be?

4. ## MATH

Sam is 5 years old. His older brother, Tom, is three times as old as Sam. When Sam is 20, how old will Tom be?

5. ## English

Please check my answers! Thanks :) 1. In Yeats’s poem “The Second Coming,” the falcon and the falconer are images that most likely represent *something out of control and unnatural. the beauty and abundance of nature. a sad, uncomfortable image of

6. ## algebra

(h=-16t^2+64t+80), after how many seconds will the object hit the ground at the bottom of the cliff.

7. ## spanish 2

ESTRUCTURA | 13.1 The subjunctive with verbs of emotion La contaminación Completa cada oración usando el subjuntivo. Sigue el modelo. 1.Su novia no recicla. (él, molestar)2.La gente se preocupa por el calentamiento global. (el gobierno, esperar) 3.Jaime

8. ## probability-April

The probability that a student passes Mathematics is 2/3 and the probability that he passes English is 4/9. If the probability that he will pass at least one subject is 4/5, then what is the probability that he will pass (i) Both the subjects? (ii) Exactly

9. ## geomtry

find the arc length of the minor arc withe degree of 120 and a radius of 8

10. ## Math

Two towns are 420 miles apart. A car leaves the first town traveling toward the second town at 55 mph. At the same time, a second car leaves the other town and heads toward the first town at 65 mph. How long will it take for the two cars to meet?

11. ## physics

A ball of mass 3.0 kg is tied to the end of a 50-cm length of string. The ball and string are swung in a circle in a vertical plane at constant speed v, which is the minimum speed necessary to keep the string taut at all times. The center of the circle is

12. ## chemistry

Calculate the compositionof the gaseous mixture obtained when 1.25 mol f carbon dioxide is exposed to hot carbon at 800 degree celcius in a 1.25 liter vessel. The equilbrim constant kc at 800 degree celcius is 14 for the reaction CO2 + C = 2C0

13. ## Chemistry

Write the balanced chemical equation for reaction the following chemical reaction ozone gas , O3 , reacts with 2,3,4,5-tetramethylheptane, CH3-CH(CH3)-CH(CH3)-CH(CH3)-CH(CH3)-CH2-CH3 , to produce carbon dioxide gas, CO2 , and water vapor, H2O

14. ## geometry...TRIANGLE

ABCD is a quadrilateral with ∠ADC=∠ACD, ∠ACB=∠ABC and CD=7. If triangles ADC and ABC have perimeter 51 and 59, respectively, what is the value of BC?

15. ## English

Identify the incorrectly punctuated sentence. A. Reesa is wearing a dark, green sweater. B. Around the collar are tiny white pearls. C. The sweater has six shiny buttons. D. She discovered the sweater in a cold, musty closet. I think it is A..?

16. ## Math

6.Sherman read 154 pages of a book in 4 days. He read 32 pages on each day of the first 2 days and y pages on the third.Which equation can be used to find p, the number of pages Sherman read on the fourth day? A.p=154-32(2xy) B.p=154-(32x2)-y

17. ## Math

The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth \$2,600. Five years after it was bought, it was worth \$2,000. If the relationship between number of years past 1998 and value of the

18. ## Math

A rose garden is designed by joining a rectangle and a semicircle, as shown below. The rectangle is 29ft long and 17ft wide. If the gardener wants to build a fence around the garden, how many feet of fence are required? (Use the value 3.14 for pi, and do

19. ## calculus

find the sum. use the summation capabilities of a graphing utility to verify your result. 5 Sigma (3a) k=2 ??

20. ## chemistry

if the amount of radioactive iodine-123 in a sample decreases from .400g to .100g in 26.2 hours, what is the half-life of iodine-123

21. ## Algebra 2

The strength of a beam varies inversely with the square of its length. If a 15-foot beam can support 500 pounds, how many pounds can a 20-foot beam support? A) 261.15 B)279.33 C)281.25 D)732.50

22. ## CHEMISTRY

after starting with 0.343g Al and excess HCl the volume of H2 gas collected over water was 472ml. the atmospheric pressure was 754 mmHg and the temp was 21c. 1 balanced chemical equation? 2calculate the pressure in atm of dry hydrogen gas in a mixture

23. ## Biomechanics

A 10 kg block sits motionless on a table in spite of an applied horizontal force of 2 N. What are the magnitudes of the reaction force and friction force acting on the block?

24. ## math

1- when a number is squared, result is five times the original number. find the number I did x^2=5x moved the 5x then x^2-5x =0 then?

25. ## english

Select the gerund phrase in the sentence below. Then, determine the noun function of the gerund. Writing a research paper sounds difficult.

26. ## government

A multi-party system a. tends to produce a stable government. b. helps one party win the support of a majority of voters. c. is composed of parties with special interests. d. promotes the ideological consensus of the public.

27. ## chemistry

According to the reaction NaOH + HCl ¨ NaCl + H2O, which is the limiting reactant when 37.0 g of HCl are mixed with 37.0 g NaOH?

28. ## Physics

A capacitor of capacity C is charged fully by a cell of emf V/2 and then it is disconnected and again connected with a cell of emf V (+ve plate of capacitor with +ve terminal of cell and vice versa). The heat developed in connecting wire during charging by

29. ## stat

A set of n = 5 pairs of X and Y values has SX = 10, SY = 20, and SXY = 10. For this set of scores, what is the value of SP?

30. ## Chemistry

Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 10.4-g sample of CaCl2 is dissolved in 102 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the

31. ## Math

8.The circumference of a circular garden is 32 feet. Which of the following expressions best represents the radius of the garden? A.32/pi B.32xpi C.32/2pi D.32x2pi pi=3 for what Im learning A

32. ## ALGEBRA.

The product of 2 positive integers is 1000. What is the smallest possible sum of these 2 integers?

33. ## Chemistry

Given the reaction: 4NH3+5O2--->4NO+6H2O When 1.20 moles of ammonia reacts, the total number of moles of products formed is: ?

34. ## chem/science

Please predict what will happen. Im not very good in chem. Iron metal and pb(NO3) Lead metal and Mg(9NO3)2 Copper metal and AL(NO3)3 Lead metal and AgNO3

35. ## maths

On children's day, a teacher brought 63 erasers and 147 sweets to distribute out completely to her class. Each student receives the same number of erasers as each other, and the same number of sweets as each other. What is the most number of students in

36. ## Chemistry

An exothermic reaction is spontaneous above 400K but non spontaneous below it. Of the deltaH for the reaction is -40.0 kcal, what are the values of deltaS and deltaG at 400K?

37. ## Math

This needs to be worked backwards. Four classmates are comparing the number of pages that they have read in a novel assigned for their language-arts class. Ken has read twice as many pages as Jenny. Alicia has read 18 pages more than Jenny and 11 pages

38. ## health

People who are taking medication to stop smoking should stick with it for at least ________. A. 2 weeks B. 6 weeks C. 12 weeks D. 20 weeks

39. ## Algebra1

1. A bicycle racer covers a 75 mile training route to prepare for an upcoming race. If the racer could increase his speed by 5 mph, he would complete the same course in 3/4 of the time. Find his average rate of speed. 2. Nina drove for 6 hours at an

40. ## statistic

Compare the two sets and describe what you discover. 46, 47, 52, 54, 61, 64, 69 57, 57, 57, 57, 58, 61, 61

41. ## Chem

A newly discovered element, Mysternium (Atomic symbol My) has two isotopes and an average atomic mass of 296.7286 amu. One of the isotopes, My-296 has a natural abundance of 61.528% and has a mass value of 295.9064 amu. What is the mass of the second

42. ## english firt additional language

english is the landscape of opportunity.Why brother to teach indegenous?

43. ## probability April-005

X is a random variable following binomial distribution with mean 2.4 and variance 1.44 find

44. ## History

4. Which of the following influenced the presidential election of 1980? high inflation low gas prices racial tensions *a war with Iraq Thank You.

45. ## geometry ( trigonometric ratios)

a girl who is standing 92 ft away from a building looks up at a angle of 86 degrees at a bird on the top of a building. What is the height, from the ground, to the bird on the top of the building ?

46. ## Physics

1. Ohm's Law states that for some circuits the voltage is proportional to the current. In other words, if you double the voltage, you will double the current. Which of these equations agrees with this statement of Ohm's Law? (∝ means "is proportional

47. ## presentation essential

dentify and evaluate the three specific credible sources of information on that topic based on the information on evaluating sources in your textbook on pages 179 – 181. Identify and discuss the criteria that were used to evaluate those three sources and

48. ## Chemistry

On strong heating, 12g of NaHSO4 release 0.9g of water vapour and a white solid is left. Deduce a chemical formula for the solid. How can I work this out? Thanks :)

49. ## physical education

why are all the pe teachers the ones that need to be the one in physical education so they could lose weight because they are the ones that are always fat and out of shape

50. ## Chemistry

What is the equation for the reaction of potassium soap with HCL?

51. ## Chemistry

A 19.9mL volume of a hydrochloric acid solution reacts completely with a solid sample of magnesium carbonate, producing 183mL of CO2 that is collected over water at 24.0 degrees C and 738 torr total pressure. The vapor pressure for water at 24.0 degrees C

52. ## maths -urgent

There is a manufacturing company who sold furniture's at the rate of Rs 31,300 per unit cost which is inclusive of 5% Value added tax. calculate the basic cost (exclusive of Value added tax) for 250 furniture's sold by the company.

53. ## chemistry

When 24.2 kg of Fe2O3 react with 14.5 kg of CO and 5.4 kg of Fe are recovered, what is the percent yield for the reaction?

54. ## Electromagnetism

A particle with a mass of 6.64x10^-27 kg and a charge of +3.2x10^-19 C is accelerated from rest through a potential difference of 2.45x10^6 V. the particle then enters a uniform magnetic field of strength 1.60 T. a) Find the particle's gain in KE as it

55. ## science

An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10È³Ê joule seconds, the speed of light is 2.998 × 10§ m/s)

56. ## math

Mrs. Browns girls scout troop had a carwash to earn some funds. they saved 1/6 of the money. They used 1/2 of the money to go horseback riding. They then had \$100 left. How much did they initially make washing cars/

57. ## Chemistory

The reaction has an equilibrium constant of = 0.154. If 6.60 of , 4.30 of , and 11.60 of are added to a reaction vessel with a volume of 5.30 , what net reaction will occur? A-The reaction will proceed to the left to establish equilibrium. B-The reaction

58. ## College Chemistry

When determining the vapor pressure of water, the bubble volume is 1.2mL at 5 degrees celsius. -How many moles of dry air were in the bubble? (assume 1 atm) -If the bubble volume is 8.6mL at 75 degrees celsius, what is the partial pressure of the dry air

59. ## Chemistry College

If KHP sample 1 requires 22.47 mL of aqueous NaOH, how many milliliters of NaOH should be needed for samples 2 and 3?

60. ## Math

Mrs.Wallace wants to buy 1 1/2 gallons of sour cream for a recipe If sour cream is sold only in 1 pint containers how many containers will she need to buy A.6 B.8 C.12 D.16 B 12.Robert has 17 games in his room He has 6 board games and the rest are video

61. ## chemistry

which metal react most vigorously? metals aluminum, copper, magnesium, lead, tin, zinc 1. which metal will react most quickly? 2. which will take the longest time to react? 3. which will react most vigorously and least vigorously? 4. list metals from order

62. ## SIMPLE physics!!!!!!

A neutral solid conducting cylinder rotates about its axis with angular speed 1600 rad/s. In addition, there is an external magnetic field of induction B directed along the cylinder's axis. What must the magnitude of the magnetic field in Teslas so that no

63. ## Calculus

Estimate ç 6 0 6−x^2 dx using 3 left rectangles.

64. ## Calculus

Estimate ç 6 0 6−x^2 dx using 3 right rectangles

65. ## Math

An object is launched upward from the ground with an initial vertical velocity of 40 feet per second. After how many seconds does the object reach a height of 25 feet?

66. ## Math

What is A Square + B square?

67. ## arithmetic mean

what is the average of 88 94 98 84

68. ## science

If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

69. ## Math

describe how you can use the graph of y=x^2 to graph the given function. y=2x^2 + 3 y=-3/4x^2 + 5

70. ## life orientation

identify and describe 3 environmental health hazards that cause ill health, crisises and or disaster within your community or any other community within south africa and globally. include evidence that is current of the identified issues. use graphs,

71. ## statistics

An oil change shop advertised to change oil within 15 minutes. Based on the data collected on a typical day, what is the probability that oil change will take 15 minutes or less time? Based on the data, do you think the business claim is valid? Explain why

72. ## science

even in multicell organisms (ex: animals) events which occur in individual cell may have profound effects on their entire organism. Prove this with detail

73. ## math

solve the following inequality. Write your solutions in interval notation. x-5/x+2>=1 I do not know what i am doing at all, please help!

74. ## math

A bicycle wheel whose radius is 30 cm covered a distancein 70 revolutions.how many kilometres was this distance

75. ## math

average cost suppose that the daily cost "C" of manufacturing bicyclesis given by c(x)=80x+5000. Then the average cost "C" is given by 80x+5000/x. How many bicyclesmust be produced each day for the average cost to be no more than \$100? I am not

76. ## Calculus

Find the area of the shaded region. The area is shaded from 0,2 on the x-axis Given: y=0 and y= x^4-2x^3

77. ## Algebra

A shingle falls straight down from the roof of a building that is 144 feet tall. a. Use a vertical motion model to write an equation that gives the height h of the shingle t seconds after it falls. b. When does the shingle hit the ground? c. If the same

78. ## Calculus

Sketch the graph and find the area of the region described below. f(x)= -3xe^((-x)^2) Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = 0 to x = 3.

79. ## math

A bicycle wheel whose radius is 30 cm covered a distancein 70 revolutions.how many kilometres was this distance

80. ## math

if one side of squre masureas (3a+2)cm and its perimerter is 44cm what is the value of varible a?

81. ## Math

Four classmates are comparing the number of pages that they have read in a novel assigned for their language-arts class. Ken has read twice as many pages as Jenny. Alicia has read 18 pages more than Jenny and 11 pages more than Mark. Mark has read 38

82. ## News opinion a

- The driver of an Okaloosa County EMS ambulance passed out before he caused a five-vehicle crash at Mary Esther Cut-Off and Wright Parkway on Tuesday evening, according to police. David M. Keller, 40, of Baker, was talking with his partner as he drove the

83. ## L.O

Identify and describe 3 environmental or any othr community within South Africa and globally.

84. ## Chemistry

Entropy is a thermodynamic quantity that predicts the spontaneity of a reaction. Is this statement always true? Explain your answer with meaningful arguments. I assume the answer is no, but I cannot give a meaningful reason.

85. ## Physics

17. A 5.6 kg toy race car moves along an x axis. The diagram below shows the force acting on the car. (The vertical axis is marked in increments of 2 N.) a) What is the momentum of the car at t = 9.0 s b) What is the car's velocity at t = 9.0 s? The graph

86. ## Math

Karen, Gavin, Nasra, and Ali each have a deck of playing cards. Each student randomly draws a card from the deck. Find the probability of these events: a) Each student draws a club. b) Karen draws a red card, Gavin draws a king, Nasra draws a black card,

87. ## chemistry

Explain why exothermic processes are mire likely spontaneous when temperature of the system is low?

88. ## Algebra

A chain store manager hs been told by the main office that daily profit, P, as related to the number of clerks working that day, x, according to the functions P=-25x^2 + 300x. What number of clerks will maximize the profit, and what is the maximum possible

89. ## math

I have to remember the facts of multiplacation. I need to remember the one times through the 12 time table. What do I do to memorize these facts.

90. ## chemistry

calculate the yield of CO2 if 30.g of C2H6 reacts with 14.0g of O2. Show work

91. ## Chemistry

Mopping the floor in a dry weather makes the floor dry quickly although detlaG0 for the water vaporization at room temperature is positive. Explain.

92. ## math

Can you check my answer to see if i really get this word problem thing A camper leaves the campsite walking due east at a rate of 3.5 mph. Another camper leaves the campsite at the same time but travels due west. In two hours the campers will be 15 miles

93. ## chemistry

Suppose you do not know the enthalpy of decomposition of the process: CaCO3 = CaO + CO2 Explain in terms of thermodynamic parameters why heating to a high temperature might turn this decomposition to a spontaneous process.

1) why is it important from a clinical standpoint to perform a B-lactamase test? Explain! 2) if the B-lactamase test was positive, what might you do to determine a viable treatment option? 3) why might Augmentin (amoxicillin clavulanate) be prescribed for

95. ## Chemistry

Four particles have free access to distribute into four different energy levels 0,5,10, and 20J. If these four particles are to create two macrostates having total energies 10J and 40J, which macrostate has more entropy?

96. ## Math Ms. Sue please

3. What is the slope of the line for the cost of subs at Sam’s Sub Shop? Sam's Sub Shop: Cost: 11 22 44 Subs: 2 4 8 2/11 5.5 1/5.5 5

97. ## Physics

A rock dropped into a pond produces a wave that takes 15 s to reach the opposite shore, 35.8 m away. The distance between consecu- tive crests of the wave is 3.3 m. What is the frequency of the wave? Answer in units of Hz

98. ## probability

A company manufactured 1, 000 televisions. Testing showed that 20 of the televisons were defective. What is the experimental probability that the next television will be defective?

99. ## physis

a cube of wood floating in water support 1 kg mass resting on the center of its top surface. when the mass is removed the cube rise 2.5cm find the length of cube? ans is 20cm

100. ## Physics

A block of mass 3.42 kg is drawn at constant speed a distance of 1.32 m along a horizontal floor by a rope exerting a constant force of magnitude 8.62 N and making an angle of 17.0 degrees above the horizontal. Compute the coefficient of friction between

101. ## chemistry

V1 = 0.55 L, P1 = 740 mm Hg, V2 = 0.79 L, P2 = ?

102. ## chemistry

The pressure in a 2.5 L container is 755.6 torr. If the volume increases to 3.6 L, what is the new pressure?

103. ## Physics

A block of mass 3.42 kg is drawn at constant speed a distance of 1.32 m along a horizontal floor by a rope exerting a constant force of magnitude 8.62 N and making an angle of 17.0 degrees above the horizontal. Compute the coefficient of friction between

Taxes: Along with incomes, peoples charitable contributions have steadily increased over the past few years. The table shows the average deduction for charitable contributions reported on individual income tax returns for the period 2007 to 2012. Find the

105. ## English

I need help getting a summery of each stanza in the poem "The Raven" by Poe.

106. ## Chemistry

Wood fragments from the floor of a palace in Syria - Syro-Hittite period. Date: 675 ± 50 years BCE , 1950 is present. PLEASE HELP!

107. ## Life oriantation

5 ways in which the human or environmental problem impacts on the community abt HIV/AIDS.Provide relevant sources to support your claims.

108. ## Maths

There are 100 runners, each given a distinct bib labeled 1 to 100. What is the most number of runners that we could arrange in a circle, such that the product of the numbers on the bibs of any 2 neighboring runners, is less than 1000?

109. ## Math

how to you multiply fractions (not mixed numbers)

110. ## Math

1=cot^2x+csc x Find all solutions

111. ## SCIENCE///////////

a region has a geothermal gradient of 180 ˚C km^-1.what type of metamorphism will occur at a pressure of 1.2×10^8 pa? answer the question by completing the sentence below. In these condition there would be ........??? metamorphism. I would appreciate if

112. ## physics

WHICH IS NOT a correct SI unit? 1- ms^-1 2-kg 3-g 4- kmh^-2 and why

113. ## Life orientation

Identify one envirnmental facters that causes ill health,accidents,crises and disasters within the community

114. ## Chemistry

Nitrosyl bromide, NOBr, readily dissociated according to the following equilibrium equation: 2 NOBr (g) ----> 2 NO(g) + Br2 (g) NOBr was placed in a 1.00 L flask at 25.0oC and allowed to dissociated. At equilibrium, 0.17 moles of Br2 are obtained. If NOBr

115. ## Physics

A 1.40 kg block moves in a straight line on a horizontal frictionless surface under the influence of a force that varies with position as F = 3x^2 - 2x. If the block's speed passing through the origin was 3.80 m/s, with what speed (in meters/second) does

116. ## physics

A car of mass 1500 kg traveling at 15.6 m/s loses its brakes and collides with the rear end of the car in front of it, which has a mass of 1020 kg and is traveling in the same direction at 12.5 m/s. If the smaller car is given a speed of 15.3 m/s by the

117. ## computer-assisted legal research part 2

what is ascii text?

118. ## Physics

A mass of 0.475 kg, on a frictionless table, is attached to a string which passes through a hole in the table. The hole is at the center of a horizontal circle in which the mass moves with constant speed. The radius of the circle is 0.510 m and the speed

119. ## math

Put this in exponent form: (3square root of x) ( square root of x cubed)

120. ## mathematics

x,y and z are complex numbers that satisfy the equations x+y+z=2, xy+yz+zx=3 and xyz=4. Given that 1/(1−x−yz)+1(1−y−zx)+1(1−z−xy)=ab, where a and b are coprime positive integers, what is the value of a+b?

121. ## Pre-Calculus

As Rita drives north on Highway 281 through San Antonio, her actual bearing is 311 degrees. If she is driving at 50mph what is her velocity in the east- west direction?

122. ## U.S/history AP

---------Great orator of Great Awakening.Former English bartender. One of 30,000 listened to him. Hellifire and brithone preacher. my answer George Whitefield

123. ## median

find median of 27, 23, 17, 14, 14

124. ## math

A segment of a circle has a 120 arc and a chord of 8^3in. Find the area of the segment.

125. ## maths

what is a mystic rose

126. ## math

Freda Pulliam and Yank Hardy are on opposite sides of a canal, pulling a barge with tow ropes. Freda exerts a force of 50 pounds at 20 degrees to the canal, and Yank pulls at an angle of 15 degrees with just enough force so that the resultant force vector

127. ## Chemistry

Calculate ∆Ssurr when a reaction having each of the following changes in enthalpy: a. ∆Hrxn0 = -287 kJ; 298 K. b. ∆Hrxn0 = 127 kJ; 77 K.

128. ## Math

how do you subtract whole numbers into fractions?

129. ## math

Any of the ten digits 0 through 9 may be used in a 6-digit code, but no digit may be used more than once. If the first two digits are 1 and 7, what is the largest possible average of all 6 digits? a)4 b)6 c)6.5 d) 7

131. ## Algebra

The value of a computer bought in 1998 decreases as time passes. Two years after the computer was bought, it was worth \$2,600. Five years after it was bought, it was worth \$2,000. If the relationship between number of years past 1998 and value of the

132. ## math

Of the following products, which has the most prime factors? a)1*121 B)11*15 C)7*19 D)6*35

133. ## science

How long does it take to prepare 4.00 g of Al by electrolysis of Al2O3 using a current of 2.50 ampere?

134. ## mathematics

It can be shown that for any positive integer n, the infinitely nested radical expression (n+(n+(n+....)^1/2)^1/2)^1/2 equals a finite number. What is the largest positive integer n≤999 such that this expression is equal to a positive integer? Details

135. ## Chemistry

Nitrogen dioxide, a pollutant in the atmosphere, can combine with water to from nitric acid. One of the possible reactions is shown below. Calculate ∆G0 and Kp for this reaction at 25oC and comment of on the spontaneity of the reaction (MUST plot the

136. ## word problem

A company makes and sells notebook computers. The company’s cost function in thousands of dollars is C(x) = 0.3x + 100, and the revenue function in thousands of dollars is R(x) = 0.75x, where x is the number of notebook computers. (a) Evaluate and

137. ## chemistry

You are studying the formation of HI(g) from its gaseous elements H2(g) and I2(g). The free energy of formation of HI(g) is –10.10 kJ/mol at 500 K. When the free energy change of the process at 500 K is zero, the reaction mixture shows partial pressures

138. ## physics

The time needed for a water wave to change from the equilibrium level to the crest is 0.4185 s. What fraction of a wavelength is this? What is the period of the wave? Answer in units of s. What is the frequency of the wave? Answer in units of Hz

139. ## Science

For an Indian Youth Environment camp essay why should someone be chosen to go?

140. ## probability April-02

Suppose flaws occur on the surface of glass with density of 3 per square meter. What is the probability of there being exactly 4 flaws on a sheet of glass of area 0.5 square meter?

141. ## probability April-03

How large a sample will we need to be able to assert with probability 0. 90 that the sample mean will not differ from the true mean by more then 2.5 units? Assume that it is known from past experience that

A consumer research group is interested in testing an automobile manufacturer’s claim that a new economy model will travel at least 25 miles per gallon of gasoline (H0: μ  25). a. With a .02 level of significance and a sample of 30 cars, what is the

143. ## probability April-004

In a random sample of 95 sections of pipe in a chemical plant, 16 showed signs of serious corrosion. Construct a 98% confidence interval for the true proportion of pipe sections showing signs of serious corrosion, using the large sample confidence interval

144. ## Chemistry

How much water must be added to 6 mL of a 0.05M stock solution to diltue it to 0.02M ? The answerI got is 15 mL. Is this correct? Thanks

ok ive got pretty much my whole test done but am stuck on this one question Regarding management and leadership, Which statement is most accurate? A. leaders can be good managers,and good managers can be good leaders. B. leaders arent managers and managers

146. ## english first additional language

traditional african mariage is an advantage for men only not women.True or false,reason why or why not,Write two paragraphs

147. ## Mathematics

Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

148. ## math

A tiny spiffy widget is a square with sides that are 6mm long. what is the widget area

149. ## Math

Dr. Michael Lewis bought a bike that cost \$455 plus 7 1/2 percent sales tax. Find the final cost

150. ## Math

How to solve I want to build fence. Around garden garden is 4 meters wide and 7 meters long? How many meters of fencing needed to buy

151. ## Chemistry

A student uses 57.4 ml of 0.2m of RbOH to titrate 25.0ml of HcLo3. What is the concentration of HcLo3?

152. ## physical

During July 1995 the comet Shemaker-Levy 9 smashed into Jupiter in a spectacular fashion. The comet actually consisted of 21 distinct pieces, the largest of which had a mass of about 4x1012 kg and a speed of 6x104 m/s. Jupiter, the largest planet in the

153. ## Meteorology

What weather word has the letters pedtidnw

154. ## physics

A narrow ray of yellow light from glowing sodium (λ 0 = 589 nm) traveling in air strikes a smooth surface of water at an angle θi = 16.5◦ . Find the angle of refraction, θr. Answer in units of ◦

155. ## Functions

what is the oblique asymptote of this rational function: (x ^ 3) / (x ^ 2+1)

156. ## Math

How do we rewrite 7/a - 9/b so that both terms have the denominator ab?

157. ## english

this is for the book to kill a mockingbird what is significant about Mr. Cunningham kneeling down and saying to Scout "i'll tell him you said hey, little lady"

158. ## math

choose the correct operation to make this statement true;10^3[?]9^2[?]190=10

159. ## statistics

A person is selected at random from a population that has the following characteristics: 65% of the people are men; the others are women 12% of the men are smokers 7% of the women are smokers 1. Find the chance that the selected person is a non-smoker,

160. ## Science

What is one reason that there are more evergreen trees in the Rocky Mountain range, instead of deciduous trees?

161. ## Calc

Which rectangular equation corresponds to this set of parametric equations? x = t + 2 and y = t^2 + 3 A. y = (x − 2)^2 − 3 B. y = (x + 2)%2 + 3 C. y = (x − 2)^2 D. y = (x + 2)^2 − 3 E. y = (x − 2)^2 + 3

What does 5 fracture each 1/2 mean?

163. ## math

Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3¡îx)(¡îx©ø) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. Thanks so

164. ## Calc

Which expression is equivalent to sin(3x) + sin x? A. 2cos(2x)sin x B. 2sin(2x)sin x C. -2sin(2x)cos x D. 2sin(2x)cos x E. -2cos(2x)sin x

165. ## chemistry

If 275 mL of hydrogen gas is produced at STP, what is the mass of lithium that reacted

166. ## Physics

Why would normal force be set to zero to calculate the minimum possible speed a rider can have at the top of a loop. Please i need help, this is due in few hours

167. ## Calc

What is the solution of this system? 2x + 3y = 32 11y − 2x = 52 A. x = 3/2 , y = 5 B. x = 4, y = 8 C. x = 7, y = 6 D. x = 10, y = 4 E. x = 8, y = 16/3

168. ## Biology

even in multicell organisms (ex: animals) events which occur in individual cell may have profound effects on their entire organism. Prove this with detail

169. ## Math

Hey everyone!! please help.. Find a function f such that the graph of f has a horizontal tangent at (1,0) and f"(x)=10x?? Thanks

170. ## Biochemistry

Based on free energies of hydrolysisgiven below, for each of the followingreactions: i)Determine the overall ∆G of thereaction ii)State whether it is favorable(spontaneous)as written ∆Ghydrolysis Phosphocreatine  

171. ## Math

Max asked 50 students in his school which breakfast cereal they prefer. The table below shows the results of his survey. What decimal represents the fraction of students who prefer Fruit Crunchies? 12 like Yummy Flakes 25 like Choco Crunch 13 Like Fruit

172. ## Biology

even in multicell organisms (ex: animals) events which occur in individual cell may have profound effects on their entire organism.

173. ## gr 11 Math

Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3square root of x) ( square root of 3 cubed) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using

174. ## chemistry

wat chemical reactions are considered to be of importance to healthcare professionals? describe rational.

175. ## Math

What is the difference of applied, basic and pure research? So my thoughts is applied research is done to determine something happens and applied research is the application of knowledge. Can you give an example of a question that would guide applied

176. ## Chemistry

What are the healthcare applications of biochemical, pharmaceutical and diagnostic chemical reactions?

177. ## math

the product code used by pitz toyz consist of a letter followed by another letter such as A1A how many diffrent codes?

178. ## algebra

In a survey of a TriDelt chapter with 50 members, 21 were taking mathematics, 33 were taking English, and 6 were taking both. How many were not taking either of these subjects? members

179. ## Math

Melanie is going to read a 219 page book. She reads at a rate of 20 pages per day. BAsed on this info which of the following statements is a reasonable conclusion A.she will have read less than 1/2 of the book after 5 days B.She will have read more than 13

180. ## Algebra 1

1.What is the value of x-y if 5x-3y=3 and -x+3y=9 ? 2.Rewrite -2x^-1 /x^2y^-1 with positive exponents 3. What is the value of xy if x+5y=26 and -x+y=4 ?

181. ## Math

This table shows the income of each team 5.Number of teams League income 2 1430 6 4290 9 6435 10 7150 s l Which expression could be used to find l the income the soccer league would earn if it had s teams A.715s B.s+2145 C.1430s D.s+2860 A

182. ## math

the product of 2 consecutive integers is 156. find the integers. I found them mentally 12 and 13 but, how do I find them while solving?

183. ## english

this is for to kill a mockingbird why does scout call the boy 'a pocket Merlin"? AND briefly describe mr.radley?

184. ## physics

The accompanying diagram shows two metal shperes suspended by srtings and separated by a distance of 3.0 meters. the charge on spere A is +5.0*10^-4 coulumb and the charge on speher B is +3.0*10^-5 coulumb. which statement best describes the electrical

185. ## math

Your store’s average basket (transaction) size for the month of March was \$11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of \$9.00 for the month of March

186. ## life orientation

what are recommedations of pollution?

187. ## Math

Expand the following expression. 3(m+2) + 4(6+m)

188. ## Accounting Associates

I have re and re-read all of the Leadership vs. Management paragraphs in my textbook, Even looked at all the figures and graphs a hundred times. I can still cannot see a clear understanding.. I have narrowed it to two possible answers, I think I am stuck

189. ## Algebra

Solve for x. (3/x+1)+4/x=2

190. ## Life orientation

Name two inastitution that are involved in supporting or giving redress to alcoholism and explain how these organisations are involved in providing a safe and healthy environment

191. ## physics

The accompanying diagram shows two metal shperes suspended by srtings and separated by a distance of 3.0 meters. the charge on spere A is +5.0*10^-4 coulumb and the charge on speher B is +3.0*10^-5 coulumb. which statement best describes the electrical

192. ## chemistry

What is the charge carried by electrons as 0.120 mole of Cr(s) is oxidized to Cr3+(aq)?

193. ## Life orientation

In 10-15 lines critically discuss 7 Ways in which the human or environmental proble impacts on the community coused by water pollution

194. ## Maths/ Calc

Supplies are dropped from a stationary (not moving up or down) helicopter and, after some amount of time, land on the ground with a velocity of -160 feet per second. Assumptions: Start time at t = 0 and ignore air resistance. Recall that the height

12d-9=15d+9

Xenophobia

197. ## Java programming

can u give me some example of withdrawal money program using array to store ten information of user. including the attributes: (i) Name of the depositor (ii) Account number (iii) Type of account (iv) Balance amount And the methods: (i) Deposit (ii)

198. ## calculus (gr 12)

Determine the maximum and minimum of each function on the given interval. f(x) = 12x − x^3 ,  x∈ [−3,5]

199. ## social studies

how is the Great Wall of China a national symbol today?

Determine the absolute extrema of each function on the given interval. Illustrate your results by sketching the graph of each function. f(x) = (x − 1)^2 , 0 ≤ x ≤ 2

asked by i am dying helppp

The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3 , where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c)

202. ## Science

I am doing a project on blizzards and I am having a hard time trying to find 3 good interactive websites. Help please? Thanks!

203. ## Chemistry

What is the pH of a buffer system that contains 0.18M NH4+ and 0.14M NH3? The pKa of NH4+ is 9.25.

204. ## health

The ________ muscle mass belongs to the posterior group

205. ## trig

Solve exactly over the indicated interval: 2sinx+cscx=3, 0

206. ## Chemistry

In saponification, does sudsing show after adding acid. Why?

207. ## calculus

Evaluate each of the following. Show all your calculations.  f" (1/3) if f(x) = −2x^5 + 2x − 6

208. ## calculus (gr 12)

Evaluate each of the following. Show all your calculations. f' (−2) if f(x) = 2x^3 + 4x^2 − 5x + 8

209. ## calculus (gr 12)

Evaluate each of the following. Show all your calculations. f" (−3) if f(x)  = 4x^3 − 3x^2 + 2x − 6

210. ## Physics

the side of a tent makes an angle of 65 to the ground. if a boy who is 1.1m tall stands inside the tent with his head touching the tent's peak, how long is the fabric that makes up the side of the tent

211. ## ELECTROLYSIS OF ZnI2

ELECTROLYSIS OF ZnI2 if you have done this experiment Please help me answer these questions as i missed the last half of my chem lab today. 1. What color change occurred when the wire is first heated. -next question is... What is the identity of the

212. ## science

how to prepare 24 μL of 5% H3BO3

213. ## calculus

Evaluate each of the following. Show all your calculations. f′ (3/4)if f(x) = −3x^3 − 7x^2 + 4x − 11

214. ## HELP non linear equations

A company mixes peanuts, cashews, and almonds to obtain 22 oz package worth 6.91 dollars. If peanuts, cashews, and almonds cost 18, 45, and 50 cents per oz respectively, and the amount of cashews is equal to the amount of almonds, how much of each is in

215. ## CALC

Evaluate each of the following. Show all your calculations. f'(3) if f(x)  = x^4 − 3x

asked by i am dying helppp
216. ## chemistry

how to prepare 24 μL of 5% H3BO3

217. ## algebra 1

is the last term a prefect square 24y if so factor it

218. ## algebra 1

Do you know of any Mutiplying and dividing rational expression calculators that shows the steps?

219. ## algebra

divide and simplify -16+2w/3 121w-968/9

220. ## Algebra 2 ..

1. An artist is designing triangular mirrors. Determine the number of different triangles that she can form using the given measurements. Then solve the triangles. Round to the nearest tenth. a=4.2 cm b= 5.7 cm measure angle A= 39 degrees 2. What angle in

221. ## math

what is 10^3 ( )9^2 ( )190 = 10. i try to work it out;( 1000 - 190 ) divided by 190 = 10 But when i think about BODMAS then i do not know how to choose the correct operation to make this statment true,can u help me please ,thanks

222. ## algebra

multiply and simplify. 3b^2-27/12b^2-300 x 48b+240/4b-12

223. ## Chemistry

What method of purification is used to separate iodoethane from traces of hydrogen iodide? Thanks :)

224. ## MECHANICAL ENGINEERING

Need help with some engineering math problems? 1. You wish to determine the total system efficiency of your hydraulic press that is powered by an electric motor. The characteristics of the hydraulic press are as follows: •Electric motor utilizes 5 amps

225. ## chemistry

Hey guys please help me answer these chemistry questions.? 1. can a strong acid be diluted. explain in detail 2. can a weak acid be diluted. explain in detail 3. how does your observation of sunlight change when you place two different concentrations of

226. ## chemistry

Which of the following statements about boiling points are true? A. The boiling point of 0.1 m NaF(aq) is lower than the boiling point of 0.1 m methanol(aq). B. The boiling point of a 0.5 m aqueous solution of LiOH is the same as the boiling point of a 0.5

227. ## Math

4.At the school pep rally 3 out of 7 students wore colors. Based on this info if 350 students attend the next pep rally how many of these students will wear school colors A.150 B>50 C>200 D.not here A

228. ## chemistry

Hey guys please help me answer these chemistry questions.? 1. can a strong acid be diluted. explain in detail 2. can a weak acid be diluted. explain in detail 3. how does your observation of sunlight change when you place two different concentrations of

229. ## english

serious accident was happened at the corner of Main Street and First Avenue last night."

230. ## math

2 csc x - 3 = - 5

231. ## life orientation

10 WAYS IN WHICH THE ENVIRONMENT HEALTH HAZARD CAN IMPACT NEGATIVELY ON ONE'S HEALTH

232. ## Math

Cary told Tony that she wants to build a rectangular patio in her backyard with an area of x^2-3x-10 square feet. If the width needs to be at least 4 feet, what are two sets of possible dimensions for Cary's patio?

233. ## Math

a person deposited \$500 in a savings account that pays 5% annual interest that is compounded yearly. at the end of 10 years, how much money will ve in the savings account?

234. ## chemistry

how many gram of h2 needed to react with 3.10 n2

235. ## chemistry

how many gram of h2 needed to react with 3.10 n2

236. ## Algebra 1

1.To solve the linear system below, which substitution of unkowns is proper ? A.substitute 5x-16 for y in the first eqn B.substitute 5x+16 for y in the first eqn C.substitute 5x+12 for y in the first eqn D.substitute 7y-4 for x in the second eqn 2.A line

237. ## chemistry

When sodium is heated with sulfur,sodium sulfide is product. What mass of sodium sulfide can be formed by heating 12.8 g of sulfur with 9.2g of sodium?

238. ## Math

Pam gave 252 water balloons to the people who came to a summer party. Each person received 18 balloons. Which equation can be used to find n, the number of people who came to the party?

239. ## math

Where would 1/10 3/6 2/5 and 9/10 be on a number line

240. ## Chemistry

some ammonia gas is dissolved in water. The exact concentration of the solution is unknown and has to be determined. Describe an experiment that would determine the concentration of the aqueous ammonia.

241. ## Chemistry

You are given the following decomposition reaction of ammonia NH3 ---> H2 + N3 unbalanced When you decompose 12.0g of NH3you produce 1.87 g of H2 Calculate the percent yield of H2

242. ## social studies

word for tartetfeleewihg

243. ## College Chemistry

When determining the vapor pressure of water, the bubble volume is 1.2mL at 5 degrees celsius. -How many moles of dry air were in the bubble? (assume 1 atm) -If the bubble volume is 8.6mL at 75 degrees celsius, what is the partial pressure of the dry air

244. ## College Chemistry

When determining the vapor pressure of water, the bubble volume is 1.2mL at 5 degrees celsius. -How many moles of dry air were in the bubble? (assume 1 atm) -If the bubble volume is 8.6mL at 75 degrees celsius, what is the partial pressure of the dry air

245. ## Life orientation

Name two institution that are involved in supporting veldfires

246. ## science

what is the differnts between asexual and sexual reproduction

247. ## math

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form ab, where a and b are coprime integers.

248. ## TRIGONOMETRY

5y3 − 16y2 − 38y + 60/ 5y − 6

249. ## math

How many ordered tuples of 7 integers x1,x2,x3,x4,x5,x6,x7 are there, such that x1+x2+x3+x4+x5+x6+x7−x1x2x3x4x5x6x7=6, and 1≤xi≤8.

250. ## physics

Find the magnitude of electric field at point p in figure due to the charges q1 = 3.3 μc, q2 = 11.1 μc and q3 = -9.2 μc

251. ## science

what is the purpose of meiosis

252. ## chemistry

The number of moles of o2 in 45.0L} of 02} gas.

253. ## algeBRA

How many integer values x satisfy the inequality 2

254. ## ALGEBRA.....URGENT

Find the number of solutions to the equation 1/a+1/b+1/c+1/d=1 where a, b, c, d are positive integers and a≤ b≤ c≤ d.

255. ## algebra 2

10,000 raffle tickets were sold and you buy 12 tickets. Whats the odds against winning

256. ## GEOMETRY......circle

Circles Γ1 and Γ2 intersect at 2 distinct points A and B. A line l through A intersects Γ1 and Γ2 at points C and D, respectively. Point E is the intersection of the tangent to Γ1 at C and the tangent to Γ2 at D. If ∠CBD=30∘, what is the measure

257. ## probability!!!!!!!!!!

41 different balls are drawn from a bag containing balls labelled 1,2,…,300. The probability that the number of balls drawn that are labelled with an odd number is larger than the number of balls drawn that are labelled with an even number can be

258. ## Science(Chemistry)

Suppose that 23 mL of 0.6 M K2CrO4(aq) reacts with 13.7 mL of AgNO3(aq) completely. What mass of NaCl is needed to react completely with 38.5 mL of the same AgNO3 solution? Answer in units of g

259. ## Math

Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3square root of x) ( square root of 3 cubed) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using

260. ## l.o

describe in five sentences the importance of managing one's finances

261. ## chemistry

what is the word and balanced chemical equation for oxalic acid and marble?

262. ## Physics

A helicopter of mass M and weight ,W,rises with vertical acceleration, a, due to the upward thrust ,u, generated by its rotor.The crew and passengers of total mass ,m, and total weight,w, exert a combined force R on the floor of the helicopter.Write an

263. ## simple PHYSICS

The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds?

264. ## science

What is the equatorial circumference of Saturn the planet example: (C=3.14 x radius x radius)

265. ## southeast

A ball is thrown downward with an initial velocity of 11 m/s. Using the approximate value of g = 10 m/s2, what is the velocity of the ball 1.6 seconds after it is released?

266. ## Algebra

An object is launched upward from the ground with an initial vertical velocity of 40 feet per second. After how many seconds does the object reach a height of 25 feet? I need to use the vertical motion model. Here is my work so far. h = -17t^2 + 40t + 25

267. ## Algebra2---

1. An artist is designing triangular mirrors. Determine the number of different triangles that she can form using the given measurements. Then solve the triangles. Round to the nearest tenth. a=4.2 cm b= 5.7 cm measure angle A= 39 degrees 2. What angle in

268. ## life orientation

Identify one human factor that causes ill health;accident and disaster.

269. ## math

melissa walks 1 and a half miles to school. After school she walks 7 eights of a mile to the park. how many more miles does she walk to school?

270. ## life orientation

discuss in a paragraph of 150 words in which one can take responsibility to provide safe and healthy living environment

271. ## math

what is the elapsed time between 10a;46P.M. and 3:28A.M.

272. ## Chemistry

What is a supernatant

273. ## Math

Solve for the following system of equAtions for y: 2x + y = 10 3x =y