# Margaret

Popular questions and responses by Margaret
1. ## Chemistry

4NH3+5O2 = 4NO + 6 H20 If a container were to have 10 molecules of O2 and 10 molecules of NH3, initially, how many total molecules (reactants plus products) would be present in the container after this reaction goes to completion?

2. ## Chemistry

10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

3. ## ENGLISH

Many people are surprised to learn how __1__ poverty is __2__ America. Today millions live below the poverty line, and the number seems to escalate daily. Judy and Martin Reed exemplify the old saying, “Opposites attract.” A __3__ Judy chooses work

4. ## Algebra

A truck can be rented from Company A for \$90 a day plus \$0.70 per mile. Company B charges \$60 a day plus \$0.80 per mile to rent the same truck. How many miles must be driven in a day to make the rental cost for Company A a better deal than Company B?

5. ## Chemistry

10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

6. ## Math

how is the following simplified 3x to the third power plus 5x to the fifth power

7. ## Chemistry

A sample of gaseous PCl5 was introduced into an evacuated flask so that the pressure of pure PCl5 would be 0.54 atm at 425 K. However, PCl5 decomposes to gaseous PCl3 and Cl2, and the actual pressure in the flask was found to be 0.85 atm. Calculate Kp for

8. ## physics

Certain neutron stars (extremely dense stars) are believed to be rotating at about 100 rev/s. If such a star has a radius of 10 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?

9. ## Math

The dimension of a rectangular pool are 32.5 feet by 15 feet. The depth of the water is 5 ft. Each cubic feet contains 7.48 gallons of water. How many gallons of water to the nearest tenth are needed to fill the pool to 75 %

10. ## math

Felicia's mom is 4 times as old as Felicia. In 16 years years her mom will be twice her age. How old is Felicia now?

11. ## math

a radio station is giving every third caller a t shirt and every tenth caller a mug. which caller will be the first to receive both prizes

12. ## Psychology

Much research is being conducted on repairing faulty sensory organs through devices such as personal guidance systems and eyeglasses, among others. Do you think that researchers should attempt to improve normal sensory capabilities beyond their

13. ## Science

Two students measured the outside temperature at noon from a thermometer hung in the playground. The two students recorded very different measurements. Give two possible reasons for why the students got such different measurements. I know one reason is one

14. ## Science

How much time is required for reflected sunlight to travel from the Moon to Earth if the distance between Earth and the Moon is 3.85 x 10 to the 5th exponent?

15. ## physics

A red bead releasd from rest at height H slides down a wire without sticking to a green bead initally at rest. The mass of the green bead is half that of the stuck together beads both continue to slide down the wire and then slide back up. With the

16. ## engineering physics

An object of mass m is dropped at t=0 from the roof of a building of hdight h. A wind blowing parallel to the face of the building exerts a constant force F on the object. At what time t does the object strike the ground? Express t in terms of g and h.

17. ## math

is x to the 4th power plus x to the 4th power equal to x to the 8th power?

18. ## math

Heidi spent \$60 on clothing items. she bought 2 pairs of shorts \$10 each. some t-shirts for \$4 each and some sandals for \$12 each. How many of each clothing item did she purchase

19. ## Math

Explain why the great white shark can grow to a length of 4.9 m.

20. ## Math

the great white shark can grow length of 4.9 m. the mako shark can grow to a length of 40 dm.which shark can grow to the greater length? explain answer

21. ## statistics

The time needed to complete a final examination in a particular college course is normally distributed with a mean of 79 minutes and a standard deviation of 8 minutes. Answer the following questions. Assume that the class has 60 students and that the

22. ## Psychology

A researcher strongly believes that physicians tend to show female nurses less attention and respect than they show male nurses. She sets up an experimental study involving observations of health clinics in different conditions. In explaining the study to

23. ## math

The Fourier series expansion for the periodic function,f(t) = |sin t|is defined in its fundamental interval. Taking π = 3.142, calculate the Fourier cosine series approximation of f(t), up to the 6th harmonics when t = 1.09. Give your answer to 3 decimal

24. ## Physics

A 2.5 kg block sits on an inclined plane with a 30 degree inclination. A light cord attached to the block passes up over a light frictionless pulley at the top of the plane and is tied to a second 2.5 kg mass freely hanging vertically. The coefficients of

25. ## Chemistry

Calculate the pH after 0.013 mole of gaseous HCl is added to 272.0 mL of each of the following buffered solutions. (Assume that all solutions are at 25°C.) (a) 0.080 M C5H5N and 0.19 M C5H5NHCl (b) 0.72 M C5H5N and 1.52 M C5H5NHCl

26. ## Chemistry

Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25°C.) (a) pH = 4.70 (b) pH = 5.26 (c) pH = 5.42 (d) pH = 4.96

27. ## Chemistry

Calculate the pH of a solution that is 0.124 M C2H5NH2 and 0.124 M C2H5NH3Cl. (Assume that the solution is at 25°C.)

28. ## Chemistry

Determine the theoretical field of aspirin for a student who started the experiment with 2.489 g of salicylic acid. Show your work.

29. ## Science

How many minutes are required for a radio signal to travel from Earth to a space station on Mars if Mare is 7.83 x 10 to the 7th power km?

30. ## Economics

To improve its standard of living, a nation’s economy must A. remain stable. B. grow through innovation. C. reach economic equity. D. allow the central government to make economic decisions. Reset Selection

Let U = {9, 10, 11, 12, 13, 14, 15, 16, 17, 18}, A = {10, 12, 14, 16}, B = {13, 17}, and C = {10, 13, 16, 17, 18}. List all the members of each of the sets. (Enter solutions from smallest to largest. If there are any unused answer boxes, enter NONE in the

What can you conclude about the effect of the thermal expansion of water on sea level?

33. ## Physics

A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? b. To

34. ## physics

A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? To

35. ## Physics 112

Two stationary point charges of 5.00 and 2.00 are separated by a distance of 60.0 . An electron is released from rest at a point midway between the charges and moves along the line connecting them. What is the electric potential energy of the electron when

36. ## Physics

A 21.0-kg box rests on a frictionless ramp with a 15.1° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 43.6° with the horizontal, what is the smallest force F the mover will have to exert to

37. ## Marketing Foundation

Select a purchase you personally have made recently and describe your buying process, including any other parties involved in the buying process and their roles in your purchase decision. To do this, please complete the following template and make sure to

Susan has red, blue, and yellow sweaters. Joanne has green, red, and white sweaters. Diane's sweaters are red, blue, and mauve. Each girl has only one sweater of each color and will pick a sweater to wear at random. Find the probability that each girl

39. ## Managerial Economics

From Table 4-1 in the text, determine by how much the demand for Florida Indian River oranges would change as a result of a 10 percent increase in the price of Florida interior oranges, and vice versa. Table 4-1: Type of Orange Florida Indian River Florida

can someone tell me how I can figure out what is a long i & short i, & how I can tell the diference? thank you

41. ## Spanish

The instructions say: "Change the verbs from the present tense to the present progressive" and gives the following example but no answer "Yo miro la television." What do I do?

42. ## math

a cube has an edge length of x cm write an equation for the volume v of the cube in term of x . if the length of each edge were doubled how would the volume change if the length were tripled how would volume x³ i mean the equation would be v=x³

43. ## math

faces of alarge cube are painted 864 are painted on one face what is the length edge of large cube how many are unpainted how many are painted on two faces and three faces See my response to your previous question. Use that information for this problem. I

44. ## math

a large cube is built from centimeter cube. faces of large cube are painted 1000 are unpainted what is the edge length ,how many are painted on one face two face and three faces If 1000 are unpainted, that must mean that the inner dimensions are 10x10x10.

45. ## math

a cube has an edge length of 12cm faces of large cube are painted how many are painted on 3,2,1 and how many are unpainted This makes absolutely no sense to me. Sorry.

46. ## chem

Can someone please help me with the following questions? 1:Suppose you were given an ancient wooden box. If you analyze the box for carbon-14 activity and find that it is 50% of that of a new piece of wood of the same size, how old is the wood in the box?

47. ## Sociology

Government institution,family institution which is more important in the society?

48. ## BC Calculus

Solve this problem algebraically, using your knowledge of derivatives. Do not solve by graphing. If 800 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed?

49. ## AP Physics

Hi! I'm supposed to derive an algebraic formula to solve for the acceleration using one of the linear kinematics formulas of an elevator with a person inside that begins to accelerate from rest moving downward. If it travels a know distance, d, in reaching

50. ## Health And Physical Education

Identify a common defense mechanism that protects you from an uncomfortable? A.reaction formation B.abstinence C.mature behaviors D.acceptance I would like to know if anyone knew the answer and if so can you please tell me my parents are getting on to me

51. ## geography

Some have a hundred some have none Clues given -It is very colourful -You see it every morning

An amount of k20.000 is invested for 5 years in a credit union which pays an annual untreated rate of 4.5 percent. Find accumulated value after 4 years if intrest rate is a: annually b:semi annually c:quarterly e:monthly

53. ## science

How much sodium bromide do I need to make 100 ml of 0.2m solution?

54. ## Math

Suzy earned \$6.10 per hour in 2008 and \$9.15 in 2011. How many times greater was the amount Suzy earned per hour in 2011 then in 2008? \$9.15 - \$6.10= \$3.05

55. ## Algebra 2

Can someone please tell me how to solve and graph this system of trinomial quadratic inequalities? {y is greater than or equal to x^2+6x+12} {y

56. ## Algebra 2

Can someone please tell me how to solve and graph this system of trinomial quadratic inequalities? {y is greater than or equal to x^2+6x+12} {y

57. ## Chemistry

I have water pH 7.0 insulation with various other things that do not affect pH, I am trying to add X amount of HCL to lower the solution to a pH of 1.5 I know pH=-log[HCl] but I'm not sure how to approach this problem, after this I am then trying to add

58. ## Math

you need to clean the gutters of your home. the gutters are 24 FT above the ground. for safety, the distance a ladder reaches up a wall should be four times the distance from the bottom of the ladder to the base of the side of the house. Therefore the

59. ## Accounting. Present Value.

Suppose you want to have \$5,000 saved at the end of five years. The bank will pay you 2% interest on your money. How much would you have to deposit today to have the \$5,000 you want at the end of five years.

60. ## Chemistry

How many moles of Aluminium Bromide is fromed from 4.0 moles of Aluminium in equation: 2Al + 3 Br2 = 2 AlBr3?

61. ## math

The Fourier series expansion for the periodic function,f(t) = |sin t|is defined in its fundamental interval. Taking π = 3.142, calculate the Fourier cosine series approximation of f(t), up to the 6th harmonics when t = 1.09. Give your answer to 3 decimal

62. ## Chemistry

10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

63. ## Mathmatics

A function of two variables is given by, f(x,y) = e^2x-3y Find the tangent approximation to f(0.989,1.166) near (0,0), giving your answer to 4 decimal places. Any kind soul to help on the problem. My professor raise this problem to me. i am so stuck.

64. ## English Composition 1

I need to change the syle of writing from a chapter in a book. From whatever syle it is written in to one of, gothic romance, pulp fiction or horror story. I don't know how to write in any of those styles, I don't know how to write!

65. ## Finance

Calculate the return and standard deviation for the following stock, in an economy with five possible states. If a Boom (Probability=25%) economy occurs, then the expected return is 30%. If a Good (Probability=25%) economy occurs, then the expected return

66. ## Chemistry

Consider the titration of 100.0 mL of 0.260 M propanoic acid (Ka = 1.310−5) with 0.130 M KOH. Calculate the pH of the resulting solution after each of the following volumes of KOH has been added. (Assume that all solutions are at 25°C.) (a) 0.0 mL (b)

67. ## Chemistry

Consider the titration of 41.5 mL of 0.213 M HCl with 0.123 M KOH. Calculate the pH of the resulting solution after the following volumes of KOH have been added. (Assume that all solutions are at 25°C.) (a) 0.0 mL (b) 10.0 mL (c) 40.0 mL (d) 80.0 mL (e)

68. ## Chemistry

Calculate the pH of a solution formed by mixing 124.8 mL of 0.481 M KF and 130.7 mL of 0.084 M HClO3.

69. ## Chemistry

What volumes of 0.47 M HF and 0.47 M NaF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.50? HF NaF

70. ## Chemistry

You make 1.00 L of a buffered solution (pH = 5.10) by mixing propanoic acid and potassium propanoate. You have 1.00 M solutions of each component of the buffered solution. What volume of each solution do you mix to make such a buffered solution? propanoic

71. ## Chemistry

How many moles of NaOH must be added to 1.0 L of 2.2 M HF to produce a solution buffered at each pH? (a) pH = pKa (b) pH = 4.24 (c) pH = 4.60

72. ## Chemistry

A buffered solution is made by adding 48.6 g C2H5NH3Cl to 1.00 L of a 0.77 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

73. ## Chemistry

Calculate the pH after 0.016 mole of NaOH is added to 1.05 L of a solution consisting of 0.138 M HONH2 and 0.127 M HONH3Cl, and calculate the pH after 0.016 mole of HCl is added to 1.05 L of the same solution of HONH2 and HONH3Cl. (Assume that all

74. ## Chemistry

Calculate the pH after 0.14 mole of NaOH is added to 1.07 L of a solution that is 0.54 M HF and 1.15 M NaF, and calculate the pH after 0.28 mole of HCl is added to 1.07 L of the same solution of HF and NaF. 0.14 mole of NaOH 0.28 mole of HCl

75. ## Chemistry

Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).

76. ## Chemistry

Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).

77. ## Chemistry

Would you expect the pressure of a 12.5 mL syringe of natural gas to be the same as the pressure of 12.5 mL of air? In other words, is Boyle's Law dependent on the type of gas that is being measured?

78. ## Chemistry

Given the following functions, answer the questions: Temperature (°C) Kw 0 1.1410−15 25 1.0010−14 35 2.0910−14 40. 2.9210−14 50. 5.4710−14 Is the autoionization of water exothermic or endothermic? (b) What is the pH of pure water at 35°C? (c)

79. ## Chemistry

Determine if the solubility would increase, decrease, or stay the same: 1) A saturated solution of sugar water is cooled from room temp to 0 degrees Celsius. 2) A solution of ocean water with dissolved oxygen is heated from 10 degrees Celsius to 15 degrees

80. ## Chemistry

What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. What is the % V/V concentration for the solution? Please show work.

81. ## Chemistry

How many grams of magnesium sulfate would you need to make 0.500 L of a 10.0% M/V solution in water? Please show work.

82. ## Chemistry

If you want to make 75 mL of a 0.015 M solution of B(OH)3 in water, how many grams of B(OH)3 would you need?

83. ## Chemistry

Given the following equilibrium constants are given at 377°C, 1/2 N2(g) + 1/2 O2(g) NO(g) K1 = 110−17 1/2 N2(g) + O2(g) NO2(g) K2 = 110−11 N2(g) + 3/2 O2(g) N2O3(g) K3 = 210−33 N2(g) + 2 O2(g) N2O4(g) K4 = 410−17 determine the values for the

84. ## Chemistry

At a particular temperature, 13.7 mol of SO3 is placed into a 3.9-L rigid container, and the SO3 dissociates by the reaction given below. 2 SO3(g) 2 SO2(g) + O2(g) At equilibrium, 3.8 mol of SO2 is present. Calculate K for this reaction.

85. ## Science

At 25°C, Kp = 2.910−3 for the following reaction. NH4OCONH2(s) 2 NH3(g) + CO2(g) In an experiment carried out at 25°C, a certain amount of NH4OCONH2 is placed in an evacuated rigid container and allowed to come to equilibrium. Calculate the total

86. ## Math

X^3+9x^2-108¡Ý0

87. ## physics

2) Tube (b) is also filled with water, A1 is 0.05m2 and A2 is 0.08m2 Two pistons are placed in both ends of the tube and forces, F1 and F2 are exerted on the pistons so that they remain at the same height. If F1 = 20N what is F2? (I got the answer to this

88. ## Statics

The right angle uniform slender bar AOB has mass m. Assuming a frely hinged pivot O, determine the magnitude of the normal force at A and the magnitude of the pin reaction at O.

89. ## Health

What causes depression? A. Genetic issues B. Biochemical issues C. There is no known cause D. Environmental issues Reset Selection

90. ## Science

In black and white photography, a photon energy of about 4.00 x 10 to the negative 19th power I is needed to bring about the changes in the silver compounds used in the film. Explain why a red light used in a darkroom does not affect the film during

91. ## Economics

How does the market price of a good in a monopoly market compare with the market price of the same good in a perfectly competitive market? A. The price is higher. B. The price is lower. C. The prices cannot be compared. D. The prices are the same.

92. ## Penn

I need to write a paragraph why i choose medical billing. It has to have different experiences that motivate you to choose that field

93. ## writing

what is the behaviors associated with editing

94. ## Microeconomics

What is the definiton of marginal proficiency consumer?

95. ## chemistry lab

Explain how the differences in the solubility products of AgI and AgCl make this experiment possible. Include in your discussion a narrative of what is happening to the electrode potentials and the I-, Cl-, and Ag+ ions.

96. ## G-Chem

How man grams of Fe+3 are required to make 1.0L of an aqueous solution of 10 ppm Fe+3: (Assume the densit of water is 1.00g/mL)

97. ## physics

A ball is thrown upward. After reaching a maximum height, it continues falling back to- ward Earth. On the way down, the ball is caught at the same height at which it was thrown upward.If the time (up and down) the ball remains in the air is 2.3 s, find

98. ## physics

A stone is thrown straight up from the ground with an initial speed of 30.5 m/s . At the same instant, a stone is dropped from a height of h meters above ground level. The two stones strike the ground simultaneously.Find the height h. gravity is 9.8 m/s2 .

99. ## algebra

. Solve using the multiplication principle. 5¡Á¡Ý-4