# Questions Asked onJanuary 13, 2013

1. ## AP Chem

MnS(s) + 2 H+ --> Mn2+ + H2S(g) At 25 C the solubility product constant, Ksp, for MnS is 5 x 10-15 and the acid dissociation constants K1 and K2 for H2S are 1 x 10-7 and 1 x 10-13, respectively. What is the equilibrium constant for the reaction represented

2. ## space science?

Which star is the densest: Antares, Spica, or Polaris?

3. ## chemistry

at 20 C the vapor pressure of dry ice is 56.5 atm. if 32 g of dry ice is placed in an evacuated .25 l chamber at a constant temperature of 20 C will all the dry ice sublime

4. ## Physics

Two forces are applied to a car in an effort to accelerate it, as shown below. The first force, F1 = 364 N, is applied at an angle α = 33° to the forward dashed line. The second force, F2 = 522 N, is applied at an angle β = 11° to the forward dashed

5. ## Physics

According to the Guinness Book of World Records (1990 edition, p. 169), the highest rotary speed ever attained was 2010 m/s (4500 mph). The rotating rod was 15 cm (5.9 in) long. Assume the speed quoted is that of the end of the rod. What is the centripetal

6. ## maths

One type of lubricating oil weighs approximately 52 pounds per cubic foot, or 7 pounds per gallon. A 42-gallon barrel will hold approximately how many cubic feet of such oil?

7. ## Physics.

A punter kicks a football at an angle of 45 degrees to the ground. The football has an initial velocity of 25 m/s, make a diagram and calculate: a) How long was the football in the air? b) How far does the football travel horizontally? c) What is the

8. ## Chemistry

How do you write the chemical equation of the dissociation of nicotinic acid, C5H4NCOOH, in water?

9. ## chemistry

Use the reaction shown to calculate the mass of iron that must be used to obtain 0.500 L of hydrogen at STP: 3Fe(s) + 4H2O(l) pr029-1.jpg Fe3O4(s) + 4H2(g

10. ## Chemistry

Which of the following solutions would have the highest osmotic pressure? 0.15 M KCl 0.2 M C6H12O6 0.2 M C12H22O11 0.2 M CH3COOH 0.15 M CaCl2

11. ## physics

a red blood cell travels at a speed of 40 cm/s in a large artery. a sound with a frequency of 100 kHz enters a blood opposite the direction flow. calculate the frequency of sound reflected from the cell and detected by a receiver. (v = 1500 m/s)

12. ## science

Can somebody write an acrostic poem for the ELEMENT mercury?? Thank you very much

13. ## science

list two things that car manufacturers do to improve a car's efficiency

14. ## Geometry

If m< JKN = 8x + 2 and m< MKL = 3x + 5, what is m< MKN? I know the answer but can you give an explanation

15. ## chemistry

A chemist decomposes several samples of carbon monoxide into carbon and oxygen and weighs the resultant elements. The results are shown below: Sample Mass of Carbon Mass of Oxygen 1 6 8 2 12 16 3 18 24 Do you notice a pattern in these results? Next, the

16. ## earth

#37 whenever scientist carefully measure any quantity many times they expect that: a. all the measurements will be exactly the same b. only two of the measurements will be exactly the same c. all but one of the measurements will be exactly the same d. the

17. ## physics

Suppose the charge q2 can be moved left or right along a line connecting charges q1 and q3. Given that q = +15 µC, find the distance from q1 where q2 experiences a net electrostatic force of zero? (The charges q1 and q3 are separated by a fixed distance

18. ## math

Zaineb is deciding whether to buy a stereo at \$695 plus GST and PST now, or to invest the money to buy the stereo in a year. Her account pays 7.35% per annum, compounded monthly. If she can buy the stereo at the same price next year, how much would she

19. ## Chemistry

In planning to administer a gaseous anesthetic to a patient, a. Why must the anesthesiologist take into account the fact that during surgery the gaseous anesthetic is used both at room (18 degrees C) and the patient's body temperature (37 degrees C)? The

20. ## physics

Sound is passing perpendicularly through an open window whose dimensions are 1.1 m  0.75 m. The sound intensity level is 95 dB above the threshold of hearing. How much sound energy comes through the window in one hour?

21. ## science

you read about a rope and pulley machine that was able to produce equal amounts of output work. was this a realistic example why or why not?

22. ## Physics

A coil of 50 turns has a cross-sectional area of 4.2x10^-3 m^2. It is placed at an angle to a uniform magnetic field of flux density 2.8 x 10^-2 T, so that the angle = 50degrees. What is the change in flux linkage when the coil is rotated anticlockwise

23. ## physics

A collision occurs between two pucks on an air-hockey table. Puck A has a mass of 0.020 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.040 kg and is initially at rest. The collision is

24. ## AP Chem

A valid Lewis structure of __________ cannot be drawn without violating the octet rule. Answer: BeH2 Why would BeH2 break the octet?

A pizza box top with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch squares from the corners and the middle sections and folding up the sides. If the area of the base is to 144 in^2, what piece of cardboard should

26. ## physics

sphere A has a mass of 4.2*10^-2 kg and is tethered to a wall by a thin thread. Sphere a has an excess of 1.2 *10^12 electrons. Sphere B has a deficit of 3.5*10^12 electrons and is o.23 m from sphere A a) determine the angle between the thread and the wall

27. ## Medical Coding

A 12-year-old boy presents with his father to the ER due to open wounds to his arm' hand, and upper leg. The injury occurred when the boy fell on a barbed-wire fence at the farm while running. Diagnosis: Multiple open wounds to the right forearm, right

28. ## Physics

In one cycle, an engine burning a mixture of air and methanol (methyl alcohol) absorbs 525 J and expels 413 J. How much work is done by this engine?

29. ## Python programming

A standard problem in mathematics is to measure the area under a curve (or to integrate the function defining the curve). A simple way to do this is to approximate the area with a series of rectangles (whose areas are easy to compute). For example, we

30. ## Chemistry

The atomic number of an electrically neutral atom is equal to the number of: Choose all that apply. Neutrons Electrons Protons I chose Electrons but somehow my homework program is telling me it's wrong? I also tried checking all of them.

31. ## Social Studies

"How was the free-trade trial of 1849 a victory for the Metis?" Was it because the 4 Metis offenders were given mercy and it also ended the HBC monopoly?

32. ## Math

Mary is blowing up a birthday balloon.After the first breath, the balloon has a 5 cm diameter . the diameter increases at a constant rate of 20% each second. What is the diameter of the balloon after 3 seconds?

33. ## Chem 2

If we burn a strip of magnesium in air, there will be two main products, magnesium oxide and magnesium nitride. If we then treat that mixture with water, the nitride ion is converted to ammonia. After boiling away the water and ammonia, we would be left

34. ## physics

A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 188.0 N at an angle of 26° with the horizontal. The box has a mass of 30 kg, and the coefficient of kinetic friction between the box and

35. ## chemistry

at 20 C the vapor pressure of dry ice is 56.5 atm. if 32 g of dry ice is placed in an evacuated .25 l chamber at a constant temperature of 20 C will all the dry ice sublime

36. ## PHYSICS

WHEN SIX PEOPLE WHOSE AVERAGE MASS IS 84 KG SIT DOWN IN A CAR, THEY FIND THAT THE CAR DROPS .84 CM LOWER ON ITS SPRINGS. THEN THEY HAVE GET OUT OF THE CAR AND BOUNCE IT UP AND DOWN. THE ACCELERATION OF GRAVITY IS 9.8 M/S^2. WHAT IS THE FREQUENCY OF THE

37. ## maths-urgent

Suppose a+4b+9c+16d+25e=-13, 4a+9b+16c +25d +36e =-8, 9a+16b+25c+36d+49e=3, Find the value of 16a+25b+36c+49d+64e=?

38. ## physics

In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner?

39. ## Physics

When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1500 kg automobile traveling at 42 m/s comes to a halt after its brakes are applied,

40. ## Geometry

A triangular entraceway has walls with corner angles of 50, 70, 60. The designer wants to place a tall bronze sculpture on a round pedestal in a central location equidistant from the three walls. How can the designer find where to place the sculpture?

41. ## AP Chemistry

The principal quantum number of the electrons that are lost when tungsten forms a cation is ? Tungsten is a transition metal.

42. ## Physics

A 1060 N crate is being pulled across a level floor by a force F of 300 N at an angle of 35° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Find the magnitude of the acceleration of the crate in m/s^2

43. ## CHEMISTRY...

1. Balance the reaction below, then use it to answer the following questions. C2H2(g)+O2(g)-->CO2(g)+H2O(l) a) How many grams of oxygen are needed to make 4.84 moles of water? Is the correct answer 387 grams of O2? b) How many grams of water will be

44. ## AP Chemistry

The Lewis structure of PF3 shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs. Is the answer 1, 3 Is it 1 because it asked for PAIRS- so there are two electrons not bonded- so one pair?

45. ## physics

as light passes from air to water vi/vr=4/3 find the angle of incidence of a ray of light if the angle or refration is 25 degrees 40 minutes (i is the angle of incidence and r is the angle of refraction)

46. ## Pre-Calculus

Point B is 12 km north of point A. Point C is 9 km from point B on a bearing of 060°. Find the distance from A to C.

47. ## Geometry

An aircraft takes off and climbs at a constant 29 degree angle until it reaches and altitude of 6 miles. At that point, how far away is the plane from the airport?

48. ## Chemistry

at which temperature will water boil when the external pressure is 30 kPa?

49. ## Principles of Finance

Determine the size of the M1 money supply using the following information. Currency \$700 billion Money market mutual funds \$2,000 billion Demand deposits \$300 billion Other checkable deposits \$300 billion Traveler’s checks \$10 billion

50. ## Chemistry

Solutions are made that contain 0.1 moles of each of the following compounds below in 100g of H20. Choose the compound whose solution will have the lowest freezing point? NaBr CO2 KClO3 MgCl2 MgSO4

51. ## chem

Which compound has a higher boiling point and why? a. PF3 b. PF5

52. ## Physics

A 4.2 kg rock is initially at rest at the top of a cliff. Assuming the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water, how high is the cliff if the temperature of 1.5 kg of water is raised

53. ## AP Chemistry

The principal quantum number of the electrons that are lost when tungsten forms a cation is ? Tungsten is a transition metal.

54. ## Machanics

An electron moving at a speed of 5 multiply by 10 raise to power six m/s was shot through a sheet of paper which is 2.1 multiply by 4cm thick.the electron emerges from the paper with a speed of 2 multiply by 10 raise to power six m/s,find the time taken by

55. ## Thermodynamic Physics

When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1500 kg automobile traveling at 42 m/s comes to a halt after its brakes are applied,

56. ## Chemistry

If a sample of gas is cooled at a constant pressure until it shrinks to one-fourth its initial volume, what change in its kelvin temperature must have occurred?

57. ## math

A board is 244 inches long, is cut into pieces that are 7 5/8 inches long. How many pieces can be cut?

58. ## chemistry

which is more endothermic in water, ammonium chloride or potassium nitrate

59. ## biochemistry

A 20.0 mL sample of gastric juice was taken from a patient suspected of having hypochloridia (low stomach acid). The sample was taken several hours after a meal so there was no ingested food or drink, and it was assumed no buffers were present. The sample

60. ## physics

An athlete whirls a 6.6 kg hammer tied to the end of a 1.2 m chain in a horizontal circle. The hammer moves at the rate of 0.432 rev/s. What is the centripetal acceleration of the hammer? Assume his arm length is included in the length given for the chain.

61. ## Algebra

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is \$4.60, how many of each kind does she have? I can't figure out

62. ## Algebra

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is \$4.60, how many of each kind does she have? I can't figure out

63. ## science

Suppose you put your lunch up on a shelf. Name two kinds of energy it has, and explain why. I think it would have potential energy because it has stored energy being off the ground, but what other energy?

64. ## physics

A 33.1 g ring that appears to be silver is heated to a temperature of 77°C, and then placed in a calorimeter containing 5.00 10-2 kg of water at 24.0°C. The calorimeter is not perfectly insulated, however, so that 0.14 kJ of energy is transferred by heat

65. ## math

Find the LCM: z^4-14z^3+49z^2,3z^2-147 and 5z+35

66. ## Chemistry

Why is AgCl not soluble in nitric acid while Ag3PO4 is?

67. ## history

in what ways was the economy different in 1860 from what it had been in 1800? how would you explain those differences?

John has a 25-gallon fish tank. John filled his tank today with 23-gallons of water. The water evaporates at a rate of 1.5 gallons per week. John adds 2 gallons to the tank every other week. At what following time will the tank contain 16.5 gallons?

69. ## physics

A 3.40 kg block is pushed along the ceiling with an constant applied force of F = 82.0 N that acts at an angle θ = 50° with the horizontal. The block accelerates to the right at 5.80 m/s2. Determine the coefficient of kinetic friction between the block

70. ## maths

theatre sold the students tickets for Rs Rs3.25 and full price ticket Rs 5. on saturday 16 more fullprice ticket sold than student ticket .the total sales on that day was Rs 740. How many tickets sold ineach.

71. ## earth

#40 which type of rock is a result of a rock changing by heat and pressure? a. metamorphic rock b. igneous rock c. sedimentary rock d. metal ores

72. ## CHM

As the number of solute particles in a given volume of solution increase will: freezing point increase, vapor press decrease? or vice versa or boiling point increase, vapor pressure decrease? or vice versa?

73. ## social studies

2013 social studies fair project: A turn in history Walt Disney Pre-Draft Please

74. ## Chemistry

Why is AgCl not soluble in nitric acid while Ag3PO4 is?

75. ## physics

two forces of 5 N respectively act on an object.when will the resultant of the two vectors be at a maximum?

76. ## AP Chemistry

The Lewis structure of shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs. Is the answer 1, 3 Is it 1 because it asked for PAIRS- so there are two electrons not bonded- so one pair?

77. ## GENERAL CHEMESTRY

Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines with a reactant (substrate) to form an unstable intermediate.

78. ## Physics

When one gallon of gasoline is burned in a car engine, 1.20 108 J of internal energy is released. Suppose that 0.99 108 J of this energy flows directly into the surroundings (engine block and exhaust system) in the form of heat. If 5.0 105 J of work is

79. ## physics

The masses of the earth and moon are 5.98 × 1024 and 7.35 × 1022 kg, respectively. Identical amounts of charge are placed on each body, such that the net force (gravitational plus electrical) on each is zero. What is the magnitude of the charge placed on

80. ## maths-urgent

if xi 's are the mid points of the class interval of grouped data, fi 's are the corresponding frequinces and x^u is the mean, then (sum of) fi( xi-x^u) is?

81. ## Physics

A mass of 4.77 kg of chilled water at 0C is placed in a freezer which is kept at −19.2C. Approximately how much electric energy is needed to operate the compressor to cool this water to −19.2 C if the room temperature is maintained at 24.2C? The

82. ## Chemistry

H2O2 + Heat = H2O + O2 Would this be combustion or decomposition? Since the products are H2O and O2, I thought it would be combustion but then H2O can be decompose into H2O and O2 which would be decomposition.

83. ## social studies

List three continents that are located in both the northern and western hemisphere?

84. ## chemistry

A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 5.908×10−10 m. Determine the frequency (in hz) of the interacting photon.

85. ## math

Solve for time. Principle - \$400 / Int 5% / simple interest \$100

86. ## Physics

A 4.90-kg ball, moving to the right at a velocity of +2.50 m/s on a frictionless table, collides head-on with a stationary 8.00-kg ball. Find the final velocities of the balls if the collision meet the following conditions. (a) elastic 4.9-kg ball = 8-kg

87. ## science

Can somebody write an acrostic poem for the ELEMENT mercury?? Thank you very much

88. ## math

I ONLY HAVE ONES AND TENTHS DIGITS. I AM LESS TAHN 9. ONE OF MY DIGITS IS 3 MORE THAN THE OTHER. WHAT NUMBER AM I?

89. ## Algebra

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is \$4.60, how many of each kind does she have? I can't figure out

90. ## physics

A 200kg turtle running at a speed of .4m/s jumps onto a stationary skateboard that masses 3.6kg. the turtle slows to .2m/s by shooting the skateboard out from under him. how fast is the skateboard moving as a result?

91. ## Ethics and the Administration of Justice

Please Help!!!· In previous weeks, you examined the professional code of ethics for a field in criminal justice and analyzed ethical dilemmas for several fields. How does your code of ethics compare to the professional code of ethics? What are the

92. ## math

x=6y/5-8y-3y+9y,what is the value of y in terms of x ?

93. ## To Breanne

I responded to that chocolate milk/ice problem. Here is a link to it. http://www.jiskha.com/display.cgi?id=1357962576#1357962576.1358029768

94. ## history

did the industrial and market revolutions make america a more or less republican society? how so?

95. ## math

Kerry Stutsman has \$500 in a saving account earning .45% interest. She is considering buying a 1-year certificate of deposit (CD) that pays 3.25% interest. What will be the annual difference in her interest earnings between the savings account and the CD?

96. ## algebra

1.2X 10log6 by 1/16=

97. ## Math

Plz cud sombdy show me long division method of x^4/(x-1)(x^2+1)???? Plz note (x-1)(x^2+1) is in the denominator.

98. ## chemistry

In the previous example, how many ml of 0.1M KMN04 are required to react with 30ml of 0.05M H2o2? The answer 3ml who helps

99. ## math

Describe how the slope of a line relates to a trend line.

100. ## Analytic Geometry

A point is equidistant from (-2,4) and (3,5). It is also equidistant from (-2,-3) and (6,-1). Find the point Please I need Help with this

101. ## Chemistry

I need to write the total ionic equation for this equation. Copper(ii)sulfate + iron = iron(iii)+ copper. Won't it be Cu2+ + SO4-2 + Fe = Fe3+ + Cu ? The answer key say 3Cu2+ + 3SO4-2 + 2Fe = 2Fe3+ + 3SO4-2 + 3Cu Where did they get the sulfate for the

102. ## Chemistry

Let say you were given this equation: NiBr2 + Co = Ni + CoBr2 How can you tell which is liquid,gas,solid,aqueous? Do you just use what you know and figure it out? Like since NiBr2 can be broken down because of the solubility rule, you can assume it aq then

103. ## chemistry

– (b) Which are likely to have much lower critical micelle concentrations? (c) Which ... (e) You wish to use a solution of this surfactant in water to dissolve oil. Which region will be required to do this? (f) How much oil will dissolve in the

104. ## Math

Explain it How can you use a pattern to find the product of 5x12?

105. ## Algebra

Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is \$4.60, how many of each kind does she have? I can't figure out

106. ## algebra

an investor invested a total of \$2100 in two mutal funds. one fund earned a 9% profit while the other earned a 7% profit.if the total profit was \$161 how much was invested in each fund

107. ## Earth Science

1. What are one internal and one external source of energy in the Earth system? 2. Earth scientists assume that the causes of natural events of phenomena can be discovered through... 3. Science constantly creates new technology. Does this new technology

108. ## Math 9

use exponent rules to simplify. Write as a single power, don't need to find the value. [ (11/20)^4 x (11/20)^-8]^5 and (11/20)^-6 you cant leave an number to the power of a negative exponent. You have to change it like this ex : 2^-3 = 1/2^3 = 1/8

109. ## physics

Two pieces of metal (A and B) are identical in every way, except that A has a much larger thermal expansion coefficient. If equal amounts of heat are added to both pieces of metal, which metal does more work on its surroundings? 1. A 2. B 3. They do the

110. ## physics

a block of ice released from rest at top of 400 m long ramp slides to the bottom in 2.20 seconds. what is the angle between the ramp and the horizontal

111. ## put was or were in the space

Tom and Ben ( ) playing

112. ## physics

A 1.62 kg mass attached to a light string rotates on a horizontal, frictionless table. The radius of the circle is 0.986 m, and the string can support a mass of 32.5 kg before breaking. The acceleration of gravity is 9.8 m/s 2 . What maximum speed can the

113. ## Math

A single card is drawn from a deck. Find the probability of selecting a 10 or a diamond.

114. ## accounting

a tabular analysis of the transactions made during august 2010 by witten company during its first month of operations is shown below each increase and decrease in stockholders' equity is explained.

115. ## physics

1. What are the examples of supersonic waves? 2. What is match cone, match no? 3. Define echo? 4. What is the effect of frequency on the velocity of sound in a gas? 5. Mathematical expression of beats. ''based on wave motion''

116. ## earth

#10 which of the following is an effect of divergent plate movement? a.) glacial activity b.) mountain building d.) canyon erosion e.) sea floor spreading

117. ## Math

Tom planted 81 plants in his garden at a total cost of \$21.85. The 81 plants consisted of peppers at 20 cents each tomatoes at 35 cents each and eggplants at 30 cents each. If the total number of peppers and tomatoes was only half the number of eggplants,

118. ## math

invest 5% compounded semiannually I want to have 23,000 in the future how much I will deposit now to have that amount 5 years from now

119. ## Physics

A satellite moves in a circular orbit around the Earth at a speed of 5.4 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 10 24 kg. The value of the

120. ## AP Chemistry

The Lewis structure of shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs. Is the answer 1, 3 Is it 1 because it asked for PAIRS- so there are two electrons not bonded- so one pair?

121. ## enc1101

Correcting run-on sentences 1. I had the opening part, I remember it like it was yesterday ”good afternoon everyone and welcome to the productions of ”What's the Meaning of Life”.” 2. I looked down at my costume and I love my little tutu my mom

122. ## physics

A Hot Wheels car rolls off a table at a speed of 2.36 m/s and hits the floor a distance of 95.1 cm from the table's edge. Determine the height (in cm) of the table.

123. ## math

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20

124. ## Liberal arts math

if this is the eaquation of a line y=2x+3 what is the parallel line and perpendicular line?

125. ## physics

You kick a .3kg soccer ball at a 30deg. angle. your toe provides an average force of 50N for .5m. How far does the ball go?

126. ## math

Jim spoke on the phone with all his friends last weekend.On Saturday he spoke for 3/8 of an hour and on Sunday he spoke for half an hour. During that time spent, he spoke to liam for 1/8 of an hour .What fraction of the time Jim spent talking with his

127. ## Chemistry

What is Mass % of an aqueous NaOH solution in which molality of NaOH is 16.7m? Density of the solution is 1.4339g/ml

128. ## CHM

Calculate the molecular weight of a small protein if a 0.32 g sample dissolved in 161 mL of H2O has an osmotic pressure of 9.0 mmHg at 25 degree celcius. (R=0.0821 L X atm/K X mol)

129. ## chemistry

How much oil will dissolve in the surfactant-water solution if the concentration of surfactant falls in region A?

130. ## Algebra

Factor the GCF out of 5x2 - 10x? I know I need to find the GCF of the coefficients but I need to write it using the distributive property. Help please?

131. ## chemistry

calculate the molarity of H2O2 if 25ml of H2O2 required 12 ml of 0.1M KMN04? The right answer 0.24M who helps

132. ## physicssss

Six grams of water changes from liquid to vapor at a pressure of one atmosphere. In the process, the volume changes from 1.3 cm3 to 2393 cm3. The latent heat of vaporization of water is 2.26 × 106 J/kg. Find the work done. Answer in units of J Find the

133. ## Differential Equations!

I'm struggling solving this separable differential equations: (du/dv) = ((uv+u)/(uv+v)) I multiplied both sides by dv to get on the left side just du and cancel out dv, but after that don't know where to go. I've tried integration by parts but it doesn't

134. ## Chemistry

I need to write the equation for the neutralization reaction of NaOH and nicotinic acid (C5H4NCOOH). Here is my attempt: C5H4NCOOH + NaOH → C5H4NCOONa + H2O First of all, is the formula for nicotinic acid correct? I am finding mixed answers when I search

A pizza box with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch squares from the corners and the middle sections folding up the sides. If the area of the base is to be 144 in^2, what size piece of cardboard should

136. ## math

Solve for time. Principle - \$400 / Int 5% / simple interest \$100

137. ## chemistry

The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.

138. ## physics

A box slides down a 26° ramp with an acceleration of 1.19 m/s2. Determine the coefficient of kinetic friction between the box and the ramp. μk =

139. ## science

1.2X 10log6 by 1/16=

140. ## Python programming

Consider the following class definition: class Frob(object): def __init__(self, name): self.name = name self.before = None self.after = None def setBefore(self, before): self.before = before def setAfter(self, after): self.after = after def

141. ## Anthroplpogy

Political integration is common in chiefdoms. common in band societies. common in tribal societies. rare in commercial societies.

142. ## earth science

#16 the inner core of the earth is solid because of increased__________ a> density and composition b> density and temperature c> temperature and pressure d> pressure and density

143. ## Python programming

1,000 students took an online course. 1/4th of them were from Africa, 1/4th from Europe , 1/4th from South America, and 1/4th from Asia. At the end of the course, the instructor observed that of the top 100 grades, 30 belonged to students from a single

144. ## health

The ________the concentration of HIV in semen or genital fluids, the more likely it is that HIV will be transmitted to a sex partner. A. Lower B. Weaker C. Higher D. All of the above

145. ## earth science

#25 seismic waves are similar to sound waves because_______ a/ both are produced by vibrations b/ both are caused by humans c/ they are both produced by radiation d/ seismic waves and sound waves are not similar in any way

146. ## earth science

#26 An inference is_____ A" using your sense to gather data B" a conclusion mad based on data C" a prediction about the results of an experiment D" a persons feeling or judgment about something

147. ## earth science

which of the following element are found in the Earths crust? iron oxygen calcium all of the above

148. ## Chemistry

How many moles are 400 g of Ca(HSO4)2

149. ## math

Which is greater? \$5.00 or the total value of all combinations of three coins you can make using only pennies, nickels, dimes, and quarters?

150. ## put was or were in the space

The girl has or have

151. ## earth science

#31 strike slips faults are most likely to occur along which type of plate boundary? a. convergent b. transform c. transcontinental d. divergent

152. ## Biology

What will happen to the enzyme activity if both competetive and non-competetive inhibitors appear at the same time together with substrates in a reaction? Which inhibitor will affect the rate of the reaction in more?

153. ## linear equations

theatre sold the students tickets for Rs Rs3.25 and full price ticket Rs 5. on saturday 16 more fullprice ticket sold than student ticket .the total sales on that day was Rs 740. How many tickets sold ineach.

154. ## Biology

What will happen to the enzyme activity if both competetive and non-competetive inhibitors appear at the same time together with substrates in a reaction? Which inhibitor will affect the rate of the reaction in more?

155. ## earth science

#33 When conducting an experiment that deals with boiling chemicals, which of the following pieces of equipment would be most important to protect you from being injured? a. fire blanket b. eye wash c. tongs d. goggles I cant decide between c and d because

156. ## MATH!!!

how do I do 2(3g+2)=1/2(12g+8) ? is it possible?

157. ## social studies

what are the three examples of new campaining practices that resulted from the election of 1828

158. ## Math

Plz cud sombdy show me long division method of x^4/(x-1)(x^2+1)???? Plz note (x-1)(x^2+1) is in the denominator.

159. ## chemistry

A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 1.828×10−10 m. Determine the frequency (in hz) of the interacting photon.

160. ## Analytic Geometry

A point is equidistant from (-2,4) and (3,5). It is also equidistant from (-2,-3) and (6,-1). Find the point Please I need Help with this

161. ## chemistry

(b) If the diffusivity is observed to double when the temperature is increased by 10 degrees C, what is the activation energy for diffusion? Express your answer in units of eV.

162. ## earth

#11 The state fossil of Nevada is the "Ichthyosaur", a dinosaur that lived in salt water. Why are so many of these fossils found in Nevada? a)lake mead once covered most of Nevada b)Nevada was once covered by oceans c)Ichthyosaur left the water to die

163. ## math (urgent!)

I was given a graph and told to find an equation for the temperature T in terms of the time t in the form T(t) = a sin(kt-c)+d where a, k, c and d are constants. The max was 32.9 and the min 21.1 I determined that amplitude = 5.9 vertical = 27 period =

164. ## CHEMISTRY

(a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of

165. ## algebra

Andrea caught seven more fish than Micah. Micah caught twice as many as Peter. If they caught a total of 37 fish, how may did each catch?

166. ## maths

rewrite the addition sum given below using digits. Each letter is used for a different digit. Answer the questions given below i) Which digit did you find first? ii) How did you find R and U? ........F.O.U.R ...........O.N.E ....T.H.R.E.E ....T.H.R.E.E

167. ## Chemistry

Assume that the LHMP is enclosed in a transparent polymer stucture. a. How will the gases inside LHMP be affected by hot days and cool nights? b. What design features might be incorporated in the LHMP to reduce those heating and cooling effects? I know

168. ## chemistry

In the previous example, how many ml of 0.1M KMN04 are required to react with 30ml of 0.05M H202? The answer 3ml Who helps

169. ## math

The lengths of two sides of a parallelogram are 3 are 5. which of the following is a possible value for the length of a diagonal of the parallelogram? a.2 b.2 c.8 d.10 e.15

170. ## math

If one side of a triangle is of length x and another side is of length x+6,which of the following could not be the lenght of the third side? a.5 b.7 c.9 d.11 e.13

171. ## Physics

A dog is tugging forward on a leas held by a physics student who is standing still. The dog is tugging with a force of 63N. The student estimates the leash to be at an angle of 25 degrees above the ground. What is the tension in the leash?

Dialogue: The new journalist is no longer deciding what the public should know. She is helping audiences make order out of it. This does not mean simply adding interpretation or analysis to news reporting. The first task of the new journalist/sense maker,

173. ## science

you read about a rope and pulley machine that was able to produce equal amounts of output work. was this a realistic example why or why not?

174. ## chemistry

At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 887.0 kg of PbS and 1330 kg of PbO.

175. ## math

If x=y+|-4|-|-5|+6,what is the value of y in terms of x?

176. ## math

If x=y3-80,what is the value of y in terms of x ?

177. ## MATH!!!

how do I do 3(d+12)=8-4d ? Please! need help!!!!

178. ## Science

What are functions of the pharynx, colon, caecum in a digestive system of a pig?

179. ## Math

Howmany times do u multiply

180. ## MATH!!!

How do I do w-3=w-6 ? Is it possible?

181. ## Math

simplify by factors of 1: 1280v^6y^9/100v^3y^5

182. ## math

If x=5y+2-3(y+2),what is the value of y in terms of x ?

183. ## physics

A weightlifter is bench-pressing 65kg. if at full extension the weight is .7m above his chest, then how much has he done after 10 repetitions (given that he simply lets the weights fall back down) if it takes 15 seconds?

184. ## History

1.What was the new deal's legacy? 2. new measures were taken during the new deal and what agencies were formed?

185. ## Mechanics

If a car moving at 180km/h redues to 72km,what is the percentage change in kinetic energy.

186. ## College Algebra

I need help factoring a problem and cant seem to get it right. The one I'm stumped on is 2x^2+7x+2. I have to compute as indicated and write final in the lowest terms. The whole problem is x^2-7x-18/x^2-6x-27*2x^2+7x+2/2x^2+5x+2

187. ## math

my tens digit is 3 less than my hundredths digit. The difference between my tenths and hundredths digit is 5. The sum of my digits is 10. What number am I?

188. ## Pre-calculus

Find the correct end behavior for a given polynomial function. 3.36x^4+8x^2+x-9

189. ## Physics

How would I determine the height of a mountain if I am given direction cosines of vectors from two points on the base of the mountain to the peak?

190. ## us history

I am making a Civil War newspaper and had to pick 5 topics from a list. The problem I am having is what year to put on my paper, I first was putting June 1863, but then realized some of the events have taken place throughout the Civil War. What is the

191. ## history

a distinct american identity had begun to emerge by 1820. how would you desccribe this identity? What were the forces that helped create unity? And what were the points of contention?

192. ## Chemistry

I have all of the answers but this one so if anyone knows this answer, i can trade you :) I tried using the formulas that were posted but i ended up with a weird answer that didn't work.... A photon interacts with a ground state electron in a hydrogen atom

193. ## math

a cylindrical tank with diameter 2.0m and height 3.2m is to be filled with water. how many litres of water are needed to fill the tank? 100cm3 = 1L

194. ## history

what was the impact of the economic revolution on the lives of women in various social groups

195. ## Social Studies

I've thought about this question for a long time and done some research but I still can't decide. Could someone please give me their opinions? "Was conflict over the Red River Settlement inevitable?" Thanks!

196. ## english poem

plz can anyone check my poem and mark my correct my mistakes. Lasts Forever once aparted, never met again never saw the wound heeling again once desired, beyond dreams no one i saw blessed anymore once hurtled, smashed from the roots never saw a tree

197. ## Python Programming

We have created a set of data values that sample a function y(x). The sample points are stored in two arrays: xVals and yVals. These represent measurements of a physical process that is subject to noise so that if a is the i'th entry of xVals (i.e. a =

198. ## math

5(3x+2)+2(3x+2)

199. ## Math

Simplify the rational expression 2x^3-x^2-6x ➗2x^2-7x+6 Pls show steps I want to understand thank u!

200. ## math

I have a board 18" x 18" x 1/8" I need to support it in an upright position at a 15 degree angle. How big must the base of support be to keep it from falling over.

201. ## Chemistry

In a distillation column, is it possible to achieve 100% or complete separation of the components (assuming they do not form azeotrope)?

202. ## midterm review scavenger hunt funsheet

water moves in bursts

203. ## balaji pharmacy clg ,science

why it is taken 85ml of hcl for 1 lt of solvent according to I.P. while it is 43.02ml of hcl when it is calculated?

A pizza bx with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch square from the corners and the middle sections and folding up the sides. If the area of the base is to be 144 in^2, what size piece of cardboard should

205. ## balaji pharmacy clg ,science

why it is taken 85ml of hcl for 1 lt of solvent according to I.P. while it is 43.02ml of hcl when it is calculated?

206. ## chemistry

What is the molarity of an HCl solution if 38.5 mL of it is titrated to the equivalence point with 41.6 mL of a 1.41 M NaOH solution?

207. ## Math

Plz cud sombdy show me long division method of x^4/(x-1)(x^2+1)???? Plz note (x-1)(x^2+1) is in the denominator.

208. ## Chemistry

Name this compound: H2O2

209. ## earth

#39 magma is a result of what process? a. cementation b. crystallization c. melting d. metamorphism

210. ## Hard math

2x^3-x^2-6x __________ 2x^2-7x+6

211. ## chemistry

The silicon wafer is coated with a layer of metallic aluminum which acts as an electrical contact. The x-ray diffraction pattern of aluminum is measured in a diffractometer with Fe k alpha radiation. At what angle,a , do you expect to observe the first

212. ## physics

what is the refrevtion of waves? And what are the laws'of refraction? Also about phase change.

214. ## earth

#16 the inner core of the earth is solid because of increased__________ a> density and composition b> density and temperature c> temperature and pressure d> pressure and density

215. ## Remainder Theorem

Let f(x) = ax^3 + bx^2 + 3x – 4. If f(x) is divided by (x – 2), the remainder is 2. When it is divided by (x – 1), the remainder is -2. Find a and b. (4 marks)

216. ## Math help pls

X^-2 - Y^-2 __________ X^-1 + Y-1

217. ## earth

#25 seismic waves are similar to sound waves because_______ a/ both are produced by vibrations b/ both are caused by humans c/ they are both produced by radiation d/ seismic waves and sound waves are not similar in any way

218. ## math

1. x=3y-2/4,what is the value of y in terms of x ? 2. x=y^3/3y^2+y/2,what is the value of y in terms of x ?

219. ## Physics

Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.

220. ## Physics

Stand two plane mirrors on their edges and parallel to one another. Place a coin between them near one end. How many images do you see? Draw a ray diagram to explain the formation of the images.

221. ## Physics

A car with a mass of 1815 kg is traveling down a road for 50 meters. It takes the car five seconds to travel this distance. Calculate the velocity, momentum, and kinetic energy of the car.

222. ## physics

Given three vectors a~=Ài~À4j~+2k~ , b~=3i~+2j~À2k~ , c~=2i~À3j~+k~ , calculate a~Á(b~c~)

223. ## Math

The height from the ground to the top of a tire on a chold's bike is 42 cm. What's the distance the bike travels for one revolution of the tire?

224. ## economics

Mary earns \$100/day at a flower shop. She will take 2 days off without pay to attend an out of town wedding. Transportation will cost \$180 round trip. Hotel \$99/day for 2 nights. What is the opprotunity cost?

225. ## maths

How many minutes before 1:00 pm was 88minutes ago 3 times the minutes after 10:00 am

226. ## Physics

What will happen if you try to place two bar magnets of exactly equal size one above the other such that their north poles are on the same side

227. ## AP Chemistry

The Lewis structure of shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs. Is the answer 1, 3 Is it 1 because it asked for PAIRS- so there are two electrons not bonded- so one pair?

228. ## earth

#33 When conducting an experiment that deals with boiling chemicals, which of the following pieces of equipment would be most important to protect you from being injured? a. fire blanket b. eye wash c. tongs d. goggles I cant decide between c and d because

229. ## algebra

Hi I need a formula for the following word problem. The cost of a cellphone has increased by 400% over 10 years. Does this correspond to a decrease of 4 times its cost?

35 +29=8x

231. ## Math

2x^3-x^2-6x / 2x^2-7x+6

232. ## government

What does this statement means? He believed that political liberty threatened the efficiency of the stare with anarchy.

233. ## math

what 2 numbers has a sum of 15 and a product of 56

234. ## Physics

The crate, m=68kg, is pushed up an incline, θ=24degrees, at a constant velocity with Fp=500N. μk=?

235. ## Information Technology

Write a C program computing the interest of \$100 invested at different rates of interest.

236. ## chemistry

At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 887.0 kg of PbS and 1330 kg of PbO.

asked by pls check it..urgent(limiting reagent)
237. ## algebra and trigonometry

Where can I find a complete drawing of the unit circle

238. ## maths-urgent

rewrite the addition sum given below using digits. Each letter is used for a different digit. Answer the questions given below i) Which digit did you find first? ii) How did you find R and U? ........F.O.U.R ...........O.N.E ....T.H.R.E.E ....T.H.R.E.E

239. ## math

Base is 16 cm squared, Width is 2.5 cm. what is the perimeter and height

240. ## Maths

1) In a sale a coat costing £45.90 is reduced by 35%. What is the new cost of the coat? How much was saved in the sale?

241. ## Science

Could anyone link or tell me why does oxygen ignite at high temperature? Thanks

242. ## Drivers Ed?

I just got my driving book, and I want to know... All this stuff about the different classes of licenses...is that something I'll need to know for the written test? Because its making no sense to me.

243. ## Math

What factors will give a product of 42? Show your work with repeated addition and with equal groups

howmany?

245. ## Chem 2

What are some precipitates that affect our bodies

246. ## anthropology

States have of all of the following except

247. ## Physics

I just have a question....How to know if the volt is -ve or not? and How to know if a charge has deficit or excess electrons ?

248. ## pre algebra

hi i need some help

249. ## Mary

Can someone please tell me the heat of fusion for Lauric Acid, Oxalic Acid, and Cetyl Alcohol? I've looked and can't find them anywhere! Thanks!

250. ## chemistry

What is the kd of ethanoic acid between isobitanol and water?

251. ## MATH!!!

is w+3=w+6 possible? I don't know how to do this...

252. ## math

steve, i still have two question I don't understand. 1. x=3y-2/4,what is the value of y in terms of x ? 2. x=y^3/3y^2+y/2,what is the value of y in terms of x ?

253. ## math

steve, i still have two question I don't understand. 1. x=3y-2/4,what is the value of y in terms of x ? 2. x=y^3/3y^2+y/2,what is the value of y in terms of x ?

254. ## chamistry

The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.