# Questions Asked onMay 4, 2010

1. ## chemistry

Sodium chloride is decomposed into the elements sodium and chlorine by means of electrical energy. How many grams of chlorine gas can be obtained from 2.50 mol NaCl?

2. ## geometry

the perimeter of a triangle is 59 inches. the longest side is 11 inches longer than the medium side, and the medium side is 3 inches more than the shortest side. Find the length of each side.

3. ## Chemistry

NH3(g) + 2O2 (g) = HNO3 (aq) + H2O (l) How do I calculate the oxidation states of Nitrogen and figure out if it is reduced, oxidized or neither? My answer is below. I am not sure if I am figuring it right. Please advise. NH3(g) + 2O2 (g) = HNO3 (aq) + H2O

4. ## physics

How long would it take a 1 200 W heater to melt 1.00 kg of ice at -12.0°C, assuming all the energy from the heater is absorbed by the ice? (Assume the specific heat of the ice is 2 090 J/kg · °C and the latent heat of fusion of water is 3.33 105 J/kg.)

5. ## Chemistry

Geraniol is a compound found in rose oil that is used in perfumes. What is the molas mass of geraniol if its vapor has a density of 0.480 g/L at a temperature of 260.0 degrees Celsius and a pressure of 0.140 atm???

6. ## chemistry!

An ideal gas has a volume of 3.0 L. If the number of moles of gas and the temperature are doubled, while the pressure remains constant, what is the new volume?

7. ## physics

what would the speed of an observer be if a red(4.688x10^14Hz) traffic light appeared green(5.555x10^14Hz) to the observer? a) 2.219x10^8 m/s b) 4.445x10^8 m/s c) 5.548x10^7 m/s d) 8.438x10^7 m/s e) 2.890x10^6 m/s

8. ## chemistry

How much energy is released when 2.55kg of diethyl ether freezes?

1 methods of controlling fullness. 2 what is fastening. 3 uses of fastening. 4 pictures of methods of controlling fullness. 5 what is controlling fullness.

10. ## Chemistry

What is the molar solubility of silver sulfide, Ag2S? (Ksp for Ag2S is 6.0 x 10^51.)

11. ## Physics

A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 373 K. If 15.0 J of work is done by the gas during this process, what is the mass of helium present? I am not sure what equations to use for this problem....

12. ## chemistry

What is the pH of a solution that is 0.20 M CH3COOH and 0.10 M CH3COONa?

If today is Tuesday, what integer stands for last Sunday?

14. ## Language arts

What are the verbs in this phrase: The earth has seven continents

15. ## math

A sheet of plywood measures 4 feet by 8 feet. Armand wants to build a dog house using one whole sheet of plywood for the floor. a. Armand needs to put a "2 by 4" under the outer edges all the way around the floor, and another "2 by 4" that runs down the

16. ## chemistry

a 14.7g ice cube is placed into 324g og water. calvulate the temperature change in the water upon complete melting of the ice. hint: determine how ,uch heat is absorbed by the melting ice and then use q=mc delta T to calculate the temperature change. use

17. ## physics

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s?

18. ## Chemistry

What is the mass of NaOH required to prepare 100.0mL of NaOH(aq) that has a pH = 13.62 ? A. 0.38g B. 0.42g C. 1.67g D. 2.40x10^-14 g OH- + H2O H3O+ + O^-2 antilog-13.62 = 0.09976 #gNaOH=(0.1-0.09976)M x 40g/mol x 0.1L = 0.40g?

19. ## Chemistry

what pH values can be assigned to acids and bases respectively?

20. ## MAth

The graph of the function y=x^3+12x^2+15x+3 has a relative maximum at x=

21. ## College Chemistry

Sulfur trioxide is made from the reaction of sulfur dioxide and oxygen. how many grams of SO3 can be made from the reaction of 1.91g SO2 with 1.29g O2? 2 SO2(g) + O2(g)---> 2SO3(g) a) 2.39g b) 3.20g c) 3.23g d) 4.77g e) 6.46g How would i solve this

22. ## world history

Given the location of the Alps, how might they have been both a help and a hindrance to the development of Italy?

23. ## chemisry

A 0.125 gram sample if a monoprotic acid of unknown molar mass is dissloved in water and titrated with 0.1003 MNaOH. The endpoint is reached after adding 20.77 ml of base. What is the molar mass of the unknown acid?

24. ## Calculus

A pilot wishes to reach an airport 350 Km due east from his present position. The wind is blowing from N25degreesE with a speed of 80 Km/h and the planes airspeed is 400 Km/h. What ground speed and what heading should the pilot steer to reach the airport?

25. ## P.O.B

NAME FOUR DEPARTMENTS OF A TYPICAL BUSINESS AND ONE FUNCTION OF EACH

26. ## Chem/Physics

"your eyes receive a signal consisting of blue light, 470nm. The energy of the signal is 2.5*10^-14J. How many photons reach your eyes?"

27. ## Chemistry

When 0.3212g of glucose was burned in bomb calorimeter of calorimeter constant 641J/K, the temperature rose by 7.943 K. Calculate a) the standard molar internal energy of combustion b) the standard enthalpy of combustion and c) the standard enthalpy of

daniels print shop purchased a new printer for \$35,000. Each year it depreciated at a rate of 5%. What will its approximate value be at the end of the fourth year?

the volume of alcohol present in 620 mL of a 40% (v/v) solution of alcohol is ______? A. 372 mL B. 40 mL C. 248 mL D. 580 mL

The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?

31. ## clothing and textile

1 what does disposal of fullness means

32. ## Trig

(2-2i)^5 find the given power write answer in rectangular form

33. ## chemistry

Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

34. ## geometry

A triangle's base is 14 inches less than 2 times its height. If h represents the height in inches, and the total area of the triangle is 54 square inches, which of the following equations can be used to determine the height?

35. ## Calculus

Two forces, F1 and F2 act on an object and the angle between them is 60 degrees. Determine the magnitude and the direction of the resultant force FR relative to F1 if F1= 50 N and F2= 30 N.

36. ## Calculus

A boat crosses a river and arrives at a point on the opposite bank directly across from its starting position. The boat travels at 4 m/s and the current is 2m/s. If the river is 600 m wide in what direction must the boat steer and how long will it take to

y =13= 72/12

38. ## chemistry

calculate the amount of heat necessary ti raise the temperature of 8.5kg of water from 12.5 to 84 degrees C

39. ## Chemistry

Sorry, I didn't finish the question: Which of the following will increase the molar sollubility of Ag2CO3? (The Ksp for Ag2CO3 is 8.1 x 10^12.) a. Add HCl b. Add AgNO3 c. Add NaCN d. a and c e. a, b, and c

40. ## geometry

A right cylinder has a radius of 3 and a height of 12. What is its surface area? If necessary, round your answer to two decimal places.

A boat crosses a river and arrives at a point on the opposite bank directly across from its starting position. The boat travels at 4 m/s and the current is 2m/s. If the river is 600 m wide in what direction must the boat steer and how long will it take to

42. ## chemisty

How many moles of carbon monoxide form at the same time that 0.337 mol CS2 forms?

43. ## geometry

basis of a right prism is a rhombus with a diagonal 8cm and 6cm.the prism height i is 12cm.find:a)the general area of prism.b)the side of prismsusurface.diagonals cutting surfaces.c)prism volume.

44. ## Language arts

What are the verbs in this phrase: Hawaii is one of the most beautiful places on earth

45. ## Chemistry

A solution is prepared by dissolving 15.6 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.00 mL sample of this stock is added to 52.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final

46. ## Math

Find the vertex, focus and directrix of the parabola. 4x - y^2 - 2y - 33 = 0 y^2+2y+1 = -4x+33+1 (y+1)^2 = -4(x+8.5) vertex:(-1,-8.5) focus:(-2,-8.5) Directrix: x=0 Is this correct?

47. ## Chemistry

Water will react most completely as an acid with A. SO3^-2 B. H2BO3- C. C6H5O- D. CH3COO- Why isn't the answer A, since H2O + SO3^-2 HSO3- + OH- so H2O and HSO3- are the conjugate acids.

48. ## Chemistry

Which of the following will increase the molar solubiity of Ag2CO3? (The Ksp for Ag2CO3 is 8.1 x 10^12.)

49. ## Chemistry

Dilution calculation: use the formula M1V1=M2V2 How many milliliters of 12 M HCl would be needed to make 200 mL of a 1.0 M HCl solution? I got 16.67 mL HCl for this part but there's a secondary question. It says: How much water would be used to make this

50. ## chemistry

calculate the pressure in atm of a balloon filled with 7.5g of helium gas if the baloons volume decreases to 7.5L suppose the balloons pressure and volume are originally 799 mmHg and 15L

51. ## Trig

Solve the equation in the interval [0•,360•] Csc theta = 1+cot theta

52. ## Chemistry

The S^2- ion is a relatively strong base with an equilibrium constant of 7.7x10^-1. What is the Ka value for HS- ? I got the equation HS^- H^+ + S^-2. Am I able to find [S^-2] with the Keq?

53. ## chemistry

the specific heat of aluminum is 0.214 cal/g degrees C. calculate the heat necessary to raise the temperature of 55.5g of aluminum from 23 to 48.6 degrees C

54. ## chemistry

if 429 grams of gas occupies 25.6L at 49 degrees C at a pressure of 759 mmHg what volume will 4.29g of gas will occupy at 53 degrees C (assume pressure is unchanged)

55. ## chem

How many moles of base are needed to neutralize 2 mol of acid for HNO3 + KOH - KNO3 + H2O?. Can u show your work please:) Thanks a bunch

56. ## HIstory

How did the Industrial Revolution impacted American Society economically, socially, politically, and morally.

57. ## Math

use Demoivre's Theorem to find the indicated power of the complex number. Express the result in standard form. (2+2i)^6 a=2 b=2 n=6 r=sqrt 2^2 + 2^2 = sqrt8 Q=7pi/4 (sqrt8)^6 = 512 512(cos 6/1 x 7pi/4) + i sin 6 x 7pi/4 512 (cos 21pi/2) + i sin (21pi/2)

58. ## Chemistry

Is 20.0 mL of 1.0M CH3COOH and 10.0mL of 1.0 M NaOH a buffer solution of 3?

59. ## chemistry URGENT

What is the total gas pressure in a sealed flask that contains oxygen at a partial pressure of 0.39 atm and water vapor at a partial pressure of 0.47 atm?

60. ## chemistry

calculate the number of moles there are when a gas occupies a volume of 3.95L at 37 degrees C and .985 atm

61. ## Chemistry

A potassium hydroxide solution has a pH of 12.90. Enough cid is added to react with half of the OH- ions present. What is the pH of the resulting solution? Assume that the products of the neutralization have no effect on pH and that the amount of

62. ## Chem

How will you make a 200 mL solution of 1 mM sucrose from a 0.1 M sucrose solution? 1. Mix 20 mL of the 100 mM sucrose and 180 mL of water. 2. Mix 50 mL of the 100 mM sucrose and 150 mL of water. 3. Mix 1 mL of the 100 mM sucrose and 199 mL of water. 4. Mix

63. ## Chemistry

a solution is prepared using .015 L of 1.0 M HCl and .020 L of .50 M HNO3. the final volume of the solution is 1.25 L. Answer th following questions. a)what are the [H3O+] and [OH-] in the final solution? b)What is the pH of the final solution?

Quan is shopping. He can buy 2 pairs of pants and 1 shirt for \$79.85 ( before tax is added). He can but 1 pair of pants and 2 shirt for \$69.85 (before tax is added). To figure out how much a shirt or a pair of pants costs,you must first identify the

65. ## Paralegal Studies

I am doing a research project for Business Law 2 from Penn Foster. has anyone done th perticular assignment? i cannot figure out the first part about corporations, non-profit, and limited liability companies?

66. ## trigonometry HARD!!

An airplane flies due north from a starting point at 234.6 mph for 40 minutes. Then turns flying 20 minutes at 252 mph in the direction N 20 degree 31 minutes East. How many miles is the airplane from the starting point?

67. ## Pre-Calc

Tee Ball is similar to baseball, but the field is a diamond 40 ft square. The pitchers mound is positioned 25 ft from homeplate. Determine the distance from the pitchers mound to 3rd base.

68. ## Stats

What is the probability that a simple random sample of 56 special orders will provide an estimate of the population proportion of special orders specifying the color black that is within plus or minus .05 of the actual population proportion,assuming p =

69. ## chemistry

what is the density of O2 gas at STP

70. ## Chemistry

For the burning of propane C3H8(g)+SO2(g)3CO2(g)+4H2O(g) which of the following is true at and temperature: i./\G0 iii./\H

71. ## Chemistry

To increase the solubility of a gas at constant temperature from 1.20 g/L at 1.4atm to 2.3 g/L the pressure would have to be increased to ______ A. 0.37 atm B. 0.7 atm C. 1.37 atm D. 2.7 atm

72. ## Chem

Write 2 separate balanced equations for the neutralization reactions of hydrochloric acid with sodium hydroxide and acetic acid with sodium hydroxide......i never get how to do that!

73. ## chemistry

Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone

74. ## Math

Logs are stacked up in apile as shown in the figure. The top row has 15 logs and the bottom row has 21 logs. How many logs are in the stack? a1= 1+14=15 an= 7+14=21 s1=(n/2)(a1+an) (n/2)(15+21) = 18 How do I figure out the n?

75. ## language arts

Who was Shakespeare's most famous patron and what did Shakespeare write to honor this patron?

76. ## Socials

Why is there so much diversity in the interior plains region ?

77. ## MATH I

x^2 + 5x +6/ x^2 - 3x -10 How do I do this? Is it asking me to divide? The answer choices are as following: A)x + 3/ x - 5 , x ≠ 5 B)x + 3/ x - 5 , x ≠ -2, 5 C)x2 + 5x + 6/ x - 5 , x ≠ 5 D)x2 + 5x + 6/ x - 5 , x ≠ -2, 5

78. ## Math

Find the center, vertices, foci, and eccentricity of the ellipse. 9x^2 + 4y^2 - 36x + 8y + 31 = 0 I know the center is (2,-1) For the vertices I had (3,-1)(1,-1) and the foci (3.8,-1)(.20,-1) and e = 1.80 but I think these are wrong.

79. ## Math

What is 54.9*10 to the 6th power in scientific notaion

80. ## chemistry

A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2

81. ## biology

explain and illustrate how the long-term survival of a species depends on resources that may be limited from time to time

82. ## physics

you are riding on a 20 meter diameter ferris wheel. when your cart is at the bottom. you feel as heavy as you normally are. what is the speed of the wheel

83. ## PHYSICS

Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right. Sphere A is at x = 23.0 cm, with a charge of -10.00 microCoulomb Sphere B is at x = 55.0 cm, with a charge of 2.00 microCoulomb Sphere C is

84. ## algebra

A rancher is putting up a rectangular electic fence to contain some horses. The rancher has 1200 feet of electric wire. The fence needs to be at least 120 feet in one direction in order to contain the barn. Which system of linear equalities describes the

85. ## hcr 230

post a 150-300-word response to the following discussion question by clicking on Reply. Explain whether or not you believe Medicare’s eligibility limitations are reasonable in scope.

86. ## Math

Find the area of the parallelogram that has the vectors as adjacent sides. u = i+2j+2k v = i+k I know that I have to use (-2,-2,2) sqrt (1-2)^2 + (2+2)^2 + (2-2)^2 = sqrt17 Area = sqrt 17. Is this correct?

Consider the wide spectrum of business organizations, ranging from gigantic corporations to working at home. Describe at least three types of business organizations that you are familiar with or that you would like to know more about. How is each one

88. ## chemistry

ind the partial pressure of oxygen in a sealed vessel that has a total pressure of 2.6 atm and also contains carbon dioxide at 1.2 atm and helium at 0.10 atm.

89. ## Math

Eliminate the parameter and write the corresponding rectangular equation whose graph represents the curve. x = sec Q y = cos Q x^2 + y^2 = 1/cos^2 + sin^2/cos^2 = x^2(1 +sin^2) = x^2(2-cos^2) x^2(2-1/x^2) = 2x^2 - 1 x^2 - y^2 = 1 My teacher said to use

i need to write 40% as a fraction in simplest form how do i do that

91. ## physics

A series RCL contains 150 ohm resistor, a 1.75x10^-6F capcitor and inductance of inductor 0.035H and voltage of generator 60.0 Hz. Determine its total impedance. a) 1500 ohm b) 1900 ohm c) 1700 ohm d) 500 ohm e) 300 ohm

92. ## algebra II URGENT

if peter received grades of 88,83,75,and 80 on four tests in English, what is the minimum grade he has to score on the fifth test to have an average of at least 85 for the course?

93. ## childcare

Why is the incubation stage of illness of concern to day care workers? A. child in this stage require a great deal of care and special attention. B.child in this stage often need special medical help c.child in this stage can often pass on the disease even

94. ## science

why do teachers tell u to go do some homework...and they have not taught u it huh???

95. ## Math

Find the angle Q between the two vectors. u = 10i + 40j v = -3j+8k cos / sqrt1700 sqrt73 cos(-120/sqrt1700 sqrt73) = .9072885394 arc cos (.9072885394) = 24.86 degrees. Is this correct?

96. ## Math (logic)

The first day you will earn 1/10 of a penny. The second day you earn twice as much (2/10 of a cent). The third day you earn double of what you earned the previous day. This payment pattern will continue for the month. What are some formulas I could use to

97. ## LAL

CHECK PLEASE are theses ALL complex sentences? 1.i will help you with your homework after you watch the baby. 2. jake stared at me as if he had seen a ghost. 3.you can order whatever you want from the menu. 4.we will be on time unless there is a traffic

98. ## Chem

Compared with a pH of 7, a solution of pH 5 has what times/fraction of the hydrogen concentration? 1. 1/100 2. nearly the same concentration 3. twice 4.5/7 5. 100 times

99. ## Chemistry

0.1 mol NaCl + 0.1 mol KCl would produce a buffer solution if dissolved in water?

100. ## Chemistry

All of the following apply to the reaction A(g)+B(g)C(g) as it is carried out at constant temperature in a rigid container EXCEPT: A)The total pressure decreases B)The rate of reaction decreases C)The entropy of the system decreases D)The number of

101. ## Trigonometry

Find all solutions for the following equation in the interval 0 ≤ x

102. ## science

According to the condensation theory, the most important factor for the formation of our planets was _____.

103. ## CHEMISTRY

2H20(l) = 2H2 (g) +O2 (g) For the above, if 1.50 mg of water is decomposed, what mass of hydrogen is procduced? (1 mg=10^6g=1 metric ton)? I came up with 0.1678475161 and rounded it to .17 mg H2. Am I on the right track and did I include the correct amount

104. ## french

le samedi, je joue ou tennis avec mon per'e

105. ## trig

use the calculator to find the trigonometric values. express your answers in ten-thousandths. sin 53 degrees 30 ft

106. ## Maroeconomics

Question 02: Consider an economy described by the following equations: Y=C+I+G Where, Y = 6,000, G = 2,000, T = 2,000 C = 300 + 0.50 (Y-T) I = 2,000 – 60r In this economy, compute: a. Private saving b. Public saving c. National saving d. The equilibrium

107. ## Chemistry

NaOH(aq) + HCl(aq)----> H20 + Nacl(aq).. solve for the amoont of energy aborbed by the solution. (50ml of 1.0M HCl is 23deg; 50ml of 1.0M NaOH is at 25deg; mixed solutuion= 31deg pls tell me the steps to take inorder to solve the question. Thanks in

108. ## Great Depression and Great Leveler/History

Hi, I just want to know if I am correct on my answer about the Great Depression and Great Leveler. I wrote, "The reason why it was called the Great Leveler was because every person was affected regardless of race and gender. Americans underwent many

109. ## grammar

John has become a rather good actor.

110. ## To SraMcJin

Sra, I want to thank you for all your help on my English poetry. You really are good at poetry. Thank you very much, I really appreciate it:-)LOL

111. ## Physical Science

How do I write and balance this chemical equation as a double replacement reaction: K2SO4(aq) + PB(NO3)2 (aq)

112. ## geometry

What is the distance between the origin and the point (5, -19)? If necessary, round your answer to two decimal places.

113. ## L.A

How should I begin my first paragraph when I'm trying to interpret a poem? The poem is Nothing Gold Can Stay by Robert Frost.Thanks

114. ## Us constitution

what the United States may have looked like had the Anti-Federalists "won" their points in the ratification debate and the writing of the Constitution

115. ## Chemistry

For the reaction NaOH + HCl---> H20 + NaCl where the mass of NaOH is 2g and the Volume of Hcl is 100ml with a 0.5 concentration. The initial temp is 25 and the final is 35, what is the amount of energy absorbed by the solution?

Date of Note March 11, length of note 200 days, Date of discount, June 28. What is the maturity date and the discount period, no leap years, exact days

117. ## chemistry

max electrostatic potential is where there are low electron density, does it mean that the larger the number of max potential indicates a strong acid strength

HOW COULD I CREATE A SENTENCE USING THREE ADJECTIVES A SUBJECT A HELPING VERB A VERB AND AN OBJECT OR A PREDICATE NOUN?? AND ALSO PUTTING THE SENTENCE IN A SENTENCE DIAGRAM.

x^2 + 5x +6/ x^2 - 3x -10 How do I do this? Is it asking me to divide? The answer choices are as following: A)x + 3/ x - 5 , x ≠ 5 B)x + 3/ x - 5 , x ≠ -2, 5 C)x2 + 5x + 6/ x - 5 , x ≠ 5 D)x2 + 5x + 6/ x - 5 , x ≠ -2, 5

120. ## Science

How is cell division responsible for growth. Could someone please tell me how it is responsible for growth clearly, thanks:-)

121. ## Algebra

How do you add or subtract rational expressions with unlike demoninators please explain with examples

A thimb is 23.0 cm from a concave mirror. The focal point is 9.0 cm. Where is the image located?

123. ## Marketing

Supposed you have been hired as a Marketing manager in a Food Supplement Company. Your company is planning to introduce Packed Branded Fresh Vegetables in the market. Selected target market for your company is Lahore. Now you are required to prepare an

124. ## Physical Science

What is the apparent contradiction in the statement that "solar energy is free" with the fact that solar cells are too expensive to use as an energy source.

125. ## Curves defined by parameteric equations

Consider the following. x = e^t - 12 y = e^2t (a) Eliminate the parameter to find a Cartesian equation of the curve.

126. ## chemistry

what happen when a solution of NaoH is add in drop and then in excess to Cacl

127. ## us history

what question was resolved with the great compromise?

128. ## Is this right

I need to express as an equivalent expression that is a sum of logarithms. logt 13ab2 is this right (log+13t+loga+log+b+log+2)

129. ## Math

Use a graphing utility to graph the function. Then use the trace or table feature to identify the limit. lim 5/x-2 x-->2 I know I posted this question before but I am still having a hard time doing this. I pressed the y= button and typed the normal

130. ## Math

A large tank contains 400-kg mixture of water and alcohol. The mixture is 64% alcohol by weight. At each step, 100 kg of the mixture will be drained from the tank, replaced with 100 kg of water and then stirred. After three steps, what percent of the final

131. ## Physics

Could someone please tell me what equations i am suppose to use to work out these problems. A capacitor in RC circuit has two overlapping plates of width 3.40 m and length 8.90 m separated by 2.60 cm. A dielectric of dielectric constant being 73.0 fills

132. ## chemistry

What is the molarity of H3O+ in a 4.97×10-2 M NH4Cl solution that hydrolyzes according to the equation. NH4+(aq) + H2O(l) = H3O+(aq) + NH3(aq)

133. ## English

I forgot to include the following sentences. I hope you can have a look at them as well. 1)Chaucer describes his appearance and profession. The merchant is a representative of the new emerging middle class in English medieval society. 2) Chaucer also wants

134. ## algebra

Rashid is helping to plan a cookout. He determines that making one making one hot dogs costs 55 cents and making a hamburger costs 90 cents. The cost must be no more than \$50, and he knows that he must at least 60 hot dogs and hamburgers. Which system of

135. ## Knowledge Management

Tacit knowledge, Explicit knowledge, General knowledge and Specific Knowledge are different types of knowledge. Case (A) An industrial engineer who has specialized in rust preventing techniques wants to build a car that would be resistant to the affects of

136. ## childcare

Following the nutritional label on the jar of peanut butter. you determine that 1 ounce of the peanut butter contains 115 calories and 9 grams of fat what percent of calories come from fat? A.30 b.40 c.70 d.80

137. ## Chemistry

For the reaction NaOH + HCl---> H20 + NaCl where the mass of NaOH is 2g and the Volume of Hcl is 100ml with a concentration of 0.5 mol/l. The initial temp is 25 and the final is 35, what is the amount of energy absorbed by the solution?

138. ## Environmental Science

For my environmental science reseaerch paper on coral reefs I wanted to copy this intro paragraph from my workbook: Coral reefs are the second richest ecosystem or interdependent environment on Earth. They have been called the rain forests of the oceans

139. ## Algebra

what would be the approximation to the nearest ten-thousandth log 8900 over log 110?

140. ## algebra

beth is two years older than julio.Gerald is twice as old as beth.debra is twice as old as gerald.the sum of theIr ages is 38.how old is beth?

141. ## Precalculus

Find the limit by direct substitution. A. lim x-> 5 square root cubed of x^2 -2x - 23. I replaced all of the x's with 5 and got -2. B. lim x-> -2 (4x^2 - 7x) / (6x + 10). I replaced all of the x's with -2 and got -15. Go to picturetrail and type in

142. ## Check Calculus

What is the sum of 3 forces in equilibrium? Is it F3 = - (F1 + F2) or 0?

143. ## Chemistry

Is 20.0 mL of 3.0 M HF a buffer solution with an approximate pH of 3?

144. ## Science

This question I posted yesterday as well, but received no help. There wasn't any info about it in my book, so I'm wonderig if you could help me with it. Why might scientists want to figure out a way to promote cell division in mature nerve cells?

145. ## Math

Find the angle Q between the two vectors. u = 10i + 40j v = -3j+8k cos / sqrt1700 sqrt73 cos(-120/sqrt1700 sqrt73) = .9072885394 arc cos (.9072885394) = 24.86 degrees. Is this correct?

146. ## chemistry

calculate the percent composition or w/v% of 3x10 to the 2nd power mL solution containing 15g of glucose

147. ## chemistry

convert 353 torr to atm

148. ## English

If you were to adapt To Kill a Mockingbird to the stage a) what changes you make to the story? b) what events would you include? how would you stage them? c) what would you leave out? why?

149. ## Math

I've been staring at this problem for an hour and have NO IDEA WHAT TO DO! "A quadratic function in the form f(x)=ax^2+bx+c contains the points (-1,0), (0,2), and (2,0)." a) determine the values of a,b, and, c b) Factorise the expression ax^2+bx+c obtained

150. ## statistics

a data set consists of a set of numerical values. which of the following is correct? a. there is no mode b. there are 2 modes c. there are 3 modes I answered a there is no mode is this correct?

151. ## math

Max is having a party with 38 people. He wants enough cupcakes to feed everyo.ne. If cupcakes are sold in packs of 6, how many packs will he need to buy? Put the answer in a complete sentence.

152. ## Calculus

A car is heading northwest at 80Km/h and a truck is heading east at 60 Km/h. Determine the velocity of the truck relative to the car.

153. ## Earth Space Science

What type of motion would have to occur to move or displace the fixed color lines produced by a gas like helium or hydrogen toward the 400 nanometer mark on the spectrum scale?

154. ## Calculus

A car is heading northwest at 80 km/h and a truck is heading east at 60km/h. Determine the velocity of the truck relative to the car.

155. ## English

Describe a memorable teacher who had a significant positive effect on you. There hasn't really been any teacher in high school like that. But, in elementary school I had quite a few. Once it was in grade one, I had to go to the hospital for a couple of

156. ## physics

a blockof mass 100 kg tied to a donkey that moves with constant accelaration of 20centimeter over second squared up a 30 degrees incline. what is the force with which the donkey pulls on the block parallel to the incline? The coefficient of kinetic

157. ## COM 220

I have to post a topic for my final project to be accepted by my instructor. I want to write a persuasive essay about drugs. My first thought was to write about why drug users use drugs but as I research this there does not seem to be anything. Do you have

158. ## chemistry

What is the concentration (in % mass) of a solution in which you dissolve 200 mg of NaHCO3 in 1.0 L of water?

159. ## Basic College Math

What numbers in a math problem adds up to 331/3?

160. ## math

help with making a frequency table and histogram using intervals of 25 meters for 20 of the tallest buildings.

161. ## Science

Could someone please have a moment to look at my science posts. I really need help on them. I'll appreciate all your help, thanks:-)

162. ## Math (URGENT)

Use calculator - answer correct to 3 places. a. 3sqrt17 + 2sqrt15 / 5sqrt7 = 10.644 b. 2sqrt11 - 3sqrt2 + 15sqrt10 + 5sqrt5 = 61.005 c. 4.3sqrt6.9 / 1.7sqrt57 = 50.163 Can someone check my answers? I keep getting the feeling these are not the right

163. ## Math

Find an equation of the parabola. vertex:(-1,2) focus:(-1,0) (x+1)^2 = 4p(y-2) (x+1)^2 = 0(y-2) (x+1)^2 = (y-2) Correct?

I am trying to understand and I hope you can help me. I just want some more explaintion about the great depression. Why do people call it a leveler? I heard some kids over at the table next to me at lunch today. Like I said I just want to know. I am

165. ## geometry

Draw three different nonconvex polygons. When you walk around a polygon, at each vertex you need to turn either right (clockwise) or left (counterclockwise). A turn to the left is measured by a positive number of degrees and a turn to the right by a

166. ## Spanish

How would you write 750 AD and 500 BC in spanish? Would it be setecientos cincuenta despues de Cristo?

Expand and simplify : (x+6)^2 (b+9)(b-9)

168. ## college

What is equivalent to 6/7=x/y^2

169. ## physics

A block of mass m= 100kg rests on a level ground. With what force, parallel to the ground, must you push the block so that it is just ready to start sliding? The coefficient of static between the block and ground is 0.40.

170. ## microbiology

Dilution Dilution Factor Colony Count 1:10000 10000 4720 1:50000 50000 1020 1:250000 250000 194 1:1000000 1000000 23 can you tell me how to calculate the colony count of the hypothetical water sample is _______CFU per ml.Thanks!

171. ## chemistry

Calculate the sodium ion concentration when 55.0 mL of 4.5 M sodium carbonate is added to 15.0 mL of 3.0 M sodium bicarbonate.

172. ## Intermediate Algebra

what is the meaning term rational expression Please give me an example how to divide rational expressions

173. ## biology

Explain why a person should believe that all life that currently exists on planet earth evolved from a simple, common ancestor through the process of mutation, natural selection, sexual selection and genetic drift.

174. ## Calc

if the integral ( [ ) ([ f(t) ,t, 0, 8) = k Find [ (3x^2f(x^3), x, 0, 2)

175. ## English

Can you check if these sentences are possible? Thank you for your invaluable help. 1) Remember to pick the children up at (or from?) the airport. 2) She promised she would give us a lift. She promised to give us a lift. 3) He is going to take the dog out

176. ## English

What are the important differences between telling a story as a novel or staging it as a play?

177. ## algebra

what the heck is the answer! "whom should yo see at the bank if you need to borrow money?

178. ## Biology

In many cases, not all of Koch's postulates can be applied to determine the cause of a human disease. Explain why.

179. ## Pre-algebra

Say that you have a triangle with sides a = 20, b = 48, and c = 51. True or false: this triangle is a right triangle.

180. ## Chemistry

Do strong and weak acids require equal numbers of drops of NaOH to neutralize? I THINK not....but i am not entirely sure......

181. ## trig

find the primary solutions. 4cos^2x-3=0 and tanx-tan^2x=0.

182. ## Technology

I'm writing an essay, and the first page is a cover page. Obviously, there shouldn't be a number there. How do I get rid of it so that there's still numbers on the other pages?

183. ## Math

use Demoivre's Theorem to find the indicated power of the complex number. Express the result in standard form. (2+2i)^6 a=2 b=2 n=6 r=sqrt 2^2 + 2^2 = sqrt8 Q=7pi/4 (sqrt8)^6 = 512 512(cos 6/1 x 7pi/4) + i sin 6 x 7pi/4 512 (cos 21pi/2) + i sin (21pi/2)

184. ## statistics

indicate whether the given statement could apply to a data set consisting of 1,000 values that are all different. a. the 29th percentile is greater than the 30th percentile. b. the median is greater than the quartile c. the third quartile is greater than

185. ## us history

who helped to expand women's rights

186. ## child psychology

I need help understanding Erickson's first five stages. I need examples of them to help me write a paper.

187. ## math

A fund drive announced that it has raised \$3276, which is 70% of its goal. How much more must be raised?

188. ## Is this algebra question right

Do you rewrite the following as an equivalent logarithmic equation yt=x as E^2-2=7.3891?

189. ## science

What is an ion?

190. ## math

What is the unit price of 5 for \$2.50

191. ## English

Recall an event when you became aware of the importance of dividing chores evenly and fairly without being influenced by gender. Can someone please explain this a little more clearly to me, I kind of get what it says, but I am not able to remember about

192. ## algebra

Which point is a solution of the inequality 1/2x - 4y

193. ## English

Can you check once more how I paraphrased the beginning of the Canterbury Tales, please? Thank you in advance. 1) He describes rain as “sweet showers fall “ which “pierce the drought of March to the root”. Paraphrase: he describes the gentle spring

194. ## mgt

what is evaluation by objectives?

Expand and simplify: -5(2x +5b)^2

196. ## general

Can you please tell me what is the Percentage of 250,800.00/2,175,000 I have 11.53% is this correct.

197. ## science

What are the two processes that use oxygen?

198. ## human service

what are the most important issues for a human service agency to address in fee setting?

199. ## english

What does this mean? If you are home studying…I hope you’re at least doing so outside! I am foreign exchange and I do not understand this. Thank You.

200. ## all

What does it mean when a school has a web based curriculum?

201. ## Chemistry

What is the pH of 50.0 M HF and 25.0mL of 1.0 M NaOH?

202. ## chemistry

does a low dipole indicate a strong acid

203. ## math

Could you help me in solving the following problem? If x varies inversely as the square of y and x=2 when y=1 find x when y=2

how is U.S. water use similar to that "water-poor" countries? how is it different?

205. ## child pahcology

I need help understanding Erickson's first five stages. I need examples of them to help me write a paper.

206. ## Math

Use a graphing utility to graph the function. Then use the trace or table feature to identify the limit. lim 5/x-2 x-->2 I know I posted this question before but I am still having a hard time doing this. I pressed the y= button and typed the normal

207. ## algebra

-21+3z/2 divide 121z-847/4

208. ## Check Calculus

What is the sum of 3 forces in equilibrium? Is it F3 = - (F1 + F2) or 0?

209. ## mgt

what is evauation of objectives?

210. ## mgt

what is evaluation by objectives?

211. ## mgt

what is evaluation by objectives?

212. ## pheonix university

Please select one of the following thesis statements: 1. America's top corporations are successful for a variety of reasons. 2. Scientists have discovered human remains thought to be more than 2 million years older than Lucy, a skeleton found in Ethiopia.

213. ## Calculus II

How do you integrate the function -- > sinx (4^cosx) from 0 to pi/2 I did "u-substitution" to make it the integral from 1 to 0 of 4^u but then i don 't know where to go from there! Thank you

214. ## science

Why do animals ( in the water) (fresh) need plants??? Why is it important ?

215. ## algebra

4 + (sqrt-4) + i

216. ## science

which best describe the desert? a.thick,waxy leaves b.many large leaves. c.a shallow root system.d.a tall,woody stem.

217. ## LAL

ARE SOME PREPOSITIONS COMPLEX LIKE USED IN A COMPLEX SENTENCE

218. ## trig1 more question

it is always true that if -1 ≤ x ≤ 1 then cos(Arccos(x)) = x Give an example showing that Arccos(cos(x))= x need NOT be true for all x

what is -4x=-76

2x^2+3x+1

221. ## french

How to answer the question: Est-ce que vous amis vous ont telephone?

222. ## Science

What mammal order has the dental formula 205/105?

223. ## math

How can you use the multiplication facts for 3 to help you find the Multiplication facts for 9?

224. ## sentences

whats a sentence for native?

How can you identify a verb/verb phrase, and how can you tell if it is present, past, future, pres. perf., past perf., future perf.?

226. ## math

what is a fraction between 1/3 and 2/3?

227. ## mgt

what is evauation of objectives?

228. ## college

On a radio ad: “Have you been fatigued, irritable, moody? If these symptoms are ignored, you might become depressed or even suicidal! Ward off the blues by taking a pill proven to cheer you up. Millions of people have, and they’re glad they did!”

229. ## mgt

what is evaluation by objectives?

230. ## economics

an accurate statement about the great depresson is

how do you scale down 46x24 picture to fit 6x4 post card

232. ## %%%%

what is the formula for finding a percentage of a dollar amount??? ex. 30 % of 233 is ??? Please help me! Thanks!

233. ## English

How to write a type sketch of "the healthy eater"?

234. ## EA ICS course

what is the optimum size for small groups? A) 3 B) 5 C) 8 D) 10

235. ## math

paul did 9 tricks in 2 minutes and 15 seconds.how many seconds did each trick take?

236. ## mgt

what is evaluation by objectives?

237. ## mgt

what is evaluation by objectives?

8d=40

240. ## matg

2/3x=4/5

what is -4x=-76

n+42=80

y-39=39

244. ## math

r|2=24 is it 48