# Questions Asked in June 2010

## Most Popular Questions of June 2010

1. ### chemistry

what volume (in ML) of a 0.150 M HNO3 solution is required to completely react wtih 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced chemical equation? Na2CO3(aq) + 2 HNO3(aq) --> 2NaNO3(aq) + H2O(l) then, in the reaction above,

asked by samantha on June 21, 2010
2. ### chemistry

Write the formula of the conjugate base for acid H3PO4 and what is the name of the base Write the formula of the conjugate base for acid H3O+ and what is the name of the base ..........and how can i tell how to get it? i am lost

asked by michelle on June 10, 2010
3. ### physics

On a 120 km track, a train travels the first 30 km at a uniform speed of 30km/h. How fast must the train travel the next 90 km so as to average 60km\h for the entire trip?

asked by reena on June 3, 2010
4. ### Chem (HELP ASAP)

Phenol C6H5OH partially dissociates in water as shown C6H5OH + H2O --> H3O+ + C6H5O- If Ka is 1.6*10^-10 and the concentration of H3O and C6H5O are both 1.0*10^-5 M at equilibrium, what would be the concentration of phenol?

asked by maria on June 8, 2010
5. ### Physics

A 1000 kg car pushes a 2000 kg truck that has a dead battery. When the drive steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 N. a) What is the magnitude of the force of the car on the truck? b) what is the

asked by Sarah on June 12, 2010
6. ### physics

A 1000 kg sports car accelerates from 0 to 30 m/s in 10 s. What is the average power of the engine?

asked by Anonymous on June 23, 2010
7. ### Math for educators

The length of time it takes college students to find a parking spot in the library parking lot follows a normal distribution with a mean of 5.5 minutes and a standard deviation of 1 minute. Find the probability that a randomly selected college student will

asked by Anonymous on June 4, 2010
8. ### physics

What is the tension in the rope of this figure description? 60 kg person is hanging in the air on a rope attached to a pulley, with a 100 kg mass attached on other end that is touching the ground.

asked by Sarah on June 13, 2010
9. ### chemistry

for a homework problem it says to build both the high spin and low spin complex ion and it gives me spin of Fe (ox)3 3- low high I don't understand what high spin and low spin is and I don't know what Fe (ox)3 3- is suppose to be

asked by Judy on June 30, 2010
10. ### physics

a ray of light (f = 5.09 x 10^14 Hz) traveling in air strikes a block of sodium chloride at an angle of incidence of 30 degrees. What is the angle of refraction for the light ray in the sodium chloride?

asked by Anonymous on June 15, 2010
11. ### Chemistry

Calculate Delta H for 4NH3 + 5O2 --> 4NO + 6H2O using: N2 +O2 --> 2NO DH= -180.5 kJ N2 + 3H2 --> 2NH3 DH= -91.8 kJ 2H2 + O2 --> 2H2O DH= -483.6 kJ

asked by Taylor on June 30, 2010
12. ### math

how many ways can you make 75 cents with quarters, dimes, and nickels

asked by crystal on June 9, 2010
13. ### Chemistry

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

asked by Kelly on June 7, 2010
14. ### chemistry

A student completes a titration by adding 12.0 milliliters of NaOH(aq) of unknown concentration to 16.0 milliliters of 0.15 M HCl(aq). What is the molar concentration of the NaOH(aq)?

asked by taylor on June 7, 2010
15. ### physics

A ferris wheel rotates at an angular velocity of .036 rad/s. At t=0min your friend Seth is at the very top of the ride. What is Seth's angular position at t=3 min, measured counterclockwise from the top?

asked by Sarah on June 14, 2010
16. ### Physics

A woman who weighs 500N stands on an 8.0-m-long board that weighs 100N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing?

asked by Ashley on June 8, 2010
17. ### physics

It is possible to shoot an arrow at a speed as high as 100 m/s. (a) If friction is neglected, how high would an arrow launched at this speed rise if shot straight up? (b) How long would the arrow be in the air? Please help! I do not have any clue as to how

asked by sarah on June 7, 2010
18. ### Physics

A 22 cm diameter bowling ball has a terminal speed of 85 m/s. What is the ball's mass?

asked by Kara on June 11, 2010
19. ### physics

a 20 g ball of clay traveling east at 2.0 m/s collides with a 30 g ball of clay traveling 30m degrees south of west at 1.0 m/s. what are the speed and direction of the resulting 50 g of clay?

asked by mary on June 28, 2010
20. ### Chemistry

What volume of oxygen is needed to react with solid sulfur to form 6.20 L of sulfur dioxide?

asked by Anonymous on June 5, 2010
21. ### math

Calculate the finance charge and new balance using the previous balance method. Previous balance = \$179.32 Annual rate = 16% Finance charge = New purchases = \$117.42 Payments/credits = \$85.00 New balance =

asked by john on June 14, 2010
22. ### physics

A uniform 8 m 1500 kg beam is hinged to a wall and supported by a thin cable attached 2 m from the free end of the beam as shown in the figure. The beam is supported at an angle of 30 degrees above the horizontal. a) free diagram b) find the tension in the

asked by Anonymous on June 17, 2010
23. ### Physics

Two vectors A. and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B?

asked by Jay on June 30, 2010
24. ### COLLEGE PHYSICS

A 62.0 kg skier is moving at 6.50 m/s on a frictionless, horizontal snow covered plateau when she encounters a rough patch 3.50 m long. The coefficient of kinetic friction between this patch and returning to friction-free snow, she skis down an icy,

asked by Anonymous on June 9, 2010
25. ### physics!

howdy, just cant seem to get this question, can anyone express this question in words i can get?! thanks A sound wave of wavelength 0.8 m divides into two equal parts that recombine to interfere constructively, with the original difference between their

asked by johnny on June 3, 2010
26. ### chemistry

Arrange the following compounds in order of increasing viscosity: Propanol, CH3CH2CH2OH; Propanediol, CH3CH(OH)CH2OH; Propanetriol , HOCH@CH(OH)CH2OH

asked by Jim on June 23, 2010

If a man runs for an hour and a half at 8 miles an hour due south; and then he continues south on a bus traveling at 55 miles an hour, for 24 minutes. How far did he travel?

asked by Louise on June 26, 2010
28. ### physics

A meter stick is pivoted at its 50-cm mark but does not balance because of non-uniformities in its material that cause its center of gravity to be displaced from its geometrical center. However, when masses of 150 and 200 grams are placed at the 10-cm and

asked by jess on June 25, 2010
29. ### torque

A meterstick is found to balance at the 49.7 cm mark when placed on a fulcrum. When a 50.0g mass is attached at the 10.0cm mark, the fulcrum must be moved to the 39.2 cm mark for balance. What is the mass of the meterstick? All of the problems ive been

asked by sar on June 22, 2010
30. ### Calculus

Identify the coordinates of any local extrema of the function y=e^x - e^(2x).

asked by Abigail on June 15, 2010
31. ### Trigonometry

1. 4sin^2x=3tan^2x-1 2. 8cos^2x-4cos^4x=3 3. 3secx-cosx=2

asked by Michael on June 5, 2010
32. ### chemistry

Convert 3.01 x 1023 molecules of C2H6 to moles.

asked by HELP!!! on June 19, 2010
33. ### chemistry

Use the equation below to answer the questions that follow. Br2 + Cl 2 ⎯→ 2BrCl a. How many moles of BrCl form when 2.74 mol Cl2 react with excess Br2? b. How many grams of BrCl form when 239.7 g Cl2 react with excess Br2? c. How many grams of Br2 are

asked by Kyree on June 2, 2010
34. ### Statistics

A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution

asked by Alex on June 20, 2010
35. ### Physics

A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 3.5 s later. How high is the cliff

asked by Gary on June 30, 2010
36. ### Calculus

"At 9am ship A is 50 km east of ship B. Ship A is sailing north at 40km/h and ship B is sailing south at 30km/h. How fast is the distance between them changing at noon?" I can never get these type of questions where two ships are heading in different

asked by Stuck on June 17, 2010
37. ### CHEM

Calcium nitrate will react with ammonium chloride at slightly elevated temperatures, as represented in the equation Ca(NO3)2(s) + 2NH4Cl(s) ---> 2N2O(g) + CaCl2(s) + 4H2O(g) What is the maximum volume of N2O at STP that could be produced using a 6.80-mol

asked by JAS on June 21, 2010
38. ### chemistry

write the overall, balanced molecular equation and indicate which element is oxidized and which id reduced for the following reactions. Include phase abbreviations. a) Mg(s)+Cr(C2H3O2)3(aq)--->? b) Cd(s)+AgNO3(ag)---->?

asked by amanda on June 12, 2010
39. ### chemistry

LiOH and NaOH can each react with CO2 to form the metal carbonate and H2O. These reactions can be used to remove CO2 from the air in a spacecraft. a. Write a balanced equation for each reaction. b. Calculate the grams of NaOH and of LiOH that remove 288 g

asked by mikey d. on June 2, 2010
40. ### Math

A standard deck of cards is made up of four suits with 13 cards in each suit (total of 52 cards). If we randomly sample five cards from a standard poker deck, find the probability that all five cards selected are clubs.

asked by Jaime on June 21, 2010
41. ### geometry

In the diagram below, the length of the legs AC and BC of right triangle ABC are 6cm and 8cm, respectively.Altitude CD is drawm to the hypotenuse of triangle ABC. what is the lenght of AD to the nearest tenth of a centimeter?

asked by Jacqueline on June 16, 2010
42. ### chemistry

The equation for burning C2H2 is 2C2H2(g) + 5O2(g) ⎯→ 4CO2(g) + 2H2O(g) a. If 15.9 L C2H2 react at STP, how many moles of CO2 are produced? (Hint: At STP, 1 mol = 22.41 L for any gas.) b. How many milliliters of CO2 (density = 1.977 g/L) can be made

asked by rob on June 2, 2010
43. ### chemisrty

put in decreasing freezing point 0.10m Na3PO4,0.35m NaCl,0.20 m MgCl2, 0.15 m C6H12O6,0.15 m CH3COOH

asked by Anonymous on June 27, 2010
44. ### poisson distribution math

Mr Lee is planning to go fishing this weekend. Assuming that the number of fish caught per hour follows a Poisson distribution with mean 0.6, find the number of complete hours that Mr Lee needs to fish so that the probability of catching more than two fish

asked by Jazz on June 8, 2010
45. ### physics

A thin 2 kg box rests on a 6 kg board that hangs over the table. the length of the board on the table is 30 cm and the length of the board hanging off the table is 20 cm. How far can the center of the box be from the end of the table before the board

asked by Anonymous on June 19, 2010
46. ### chemistry

for SCN- if S-C has a bond order of 1, S=C and C=N have bond orders of 2, and C triple bond N hasa bond order of 3, ... Do the bond length in SCN- point to one resonance structure over the other? Which one?

asked by Jin on June 30, 2010
47. ### chemistry

what volume (in L) of 0.150 M KCl solution is required to completely react with 0.150 L of a 0.175 M Pb(NO3)2 solution according to the following balanced chemical equation? 2KCl (aq) + Pb(NO3)2 (aq) --> PbCl2 (s) + 2 KNO3 (aq)

asked by samantha on June 21, 2010
48. ### CHEMISTRRY

What is the molarity of an HCl solution if 49.0 mL is completely titrated by 68.4 mL of an NaOh solution whose concentration is 0.333 M?

asked by Mel on June 8, 2010
49. ### chemistry

A volume of 35.0 mL of nitrogen gas was collected over water at 24 degrees C and 99.1kPa. The vapor pressure of water at this temperature is 2.99 kPa. What is the pressure of the nitrogen gas alone?

asked by Edward on June 14, 2010
50. ### Riddle

what happens when the king of beasts runs in front of a train

asked by Nile on June 3, 2010
51. ### Statistics

find z such that 5.2% of the standard normal curve lies to the left of z

asked by John on June 14, 2010
52. ### geometry

The sides of a rhombus with angle of 60° are 6 inches. Find the area of the rhombus.

asked by Anonymous on June 8, 2010
53. ### math/Probability

what is the probability of rolling a sum that exceeds 4 with two dice

asked by anna on June 11, 2010
54. ### chemistry

What mass of chromium could be deposited by electrolysis of an aqueous solution of Cr2(SO4)3 for 180.0 minutes using a constant current of 10.0 amperes? (One faraday = 96,500 coulombs.)

asked by ill matic on June 11, 2010
55. ### chemistry

The normal boiling point of acetone is 56.2 (degrees)C and the molar heat of vaporization is 32.0 kj/mol. At what temperature will acetone boil under a pressure of 50.0 mmHg?

asked by Jim on June 21, 2010
56. ### Chemistry

What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 140.0 mL of 0.400 M Pb(NO3)2? I desperately need help with this, I cannot figure it out, my mind is bleeding.

asked by Casey on June 17, 2010
57. ### Finance

Suppose two athletes sign 10-year contracts for €80 million. In one case, we are told that the €80 million will be paid in 10 equal installments. In the other case, we are told that the Euros €80 million will be paid in 10 installments, but the

asked by Yesica on June 24, 2010
58. ### geometry

An isosceles trapezoid has bases of 4 and 10. If the base angle is 45°, find the area.

asked by Anonymous on June 8, 2010
59. ### English

Read the lines from Shelley's "Ode to the West Wind." O thou Who chariotest to their dark wintry bed The winged seeds, where they lie cold and low, Each like a corpse within its grave, Which best explains the metaphor in these lines? 1.The wind is compared

asked by Courtney on June 3, 2010
60. ### college math

A piece of land in Ottawa with an area of 0.4 square kilometers is priced at 5600 Canadian dollars. If there are 1.358 Canadian dollars per (U.S.) dollar, then what is the price in dollars per square mile?

asked by Leissa on June 24, 2010
61. ### Geometry

If [angle]D is a right angle and lines PN, FG, and BD are parallel to each other, prove [angle]SPN ~ [angle]SFG ~ [angle]SBD

62. ### Geometry HELP

Find the area of the parallelogram.( with base(s)=10 and the side length(s)=6cm. I don't know the height or area so how do I get my answer? here are the multiple choice answers. a.)15âˆš3 cm^2 b.)15âˆš2 cm^2 c.) 30âˆš3 cm^2

asked by Ariel on June 9, 2010
63. ### physics

A boat takes 3hr to travel 30 km down a river, then 5hr to return. How fast is the river flowing?

asked by Kara on June 7, 2010
64. ### Math

The scale of map is 1:20000. Find the area on the map which represents 124km^2

asked by Vince on June 3, 2010
65. ### Chemistry

What is the H3O+ in a solution that contains 1.48 g HNO3 in 0.560 L of solution?

asked by Angela on June 7, 2010
66. ### chemistry

Of the metals Pb, Mg, Au, and Na, which will not spontaneously donate electrons to copper in solution?

asked by Lou on June 14, 2010
67. ### Chemistry

When heated, lithium reacts with nitrogen to form lithium nitride: 6Li+N2 --> 2Li3N What is the theoretical yield of Li3N in grams when 12.4 g of Li is heated with 33.9g of N2

asked by Jerry on June 12, 2010
68. ### physics -jumper

The feet of a standing person of mass m exert a force equal to mg on the floor, and the floor exerts an equal and opposite force upwards on the feet, which we call the normal force. During the extension phase of a vertical jump, the feet exert a force on

asked by lau on June 4, 2010
69. ### College Physics

A hockey puck B rests on frictionless, level ice and is struck by a second puck A, which was originally traveling at 40.0 m/s and which is deflected 30 degrees from its original direction. Puck B acquires a velocity at a -45 degree angle to the original

asked by Anonymous on June 13, 2010
70. ### equilibrium constant

WHat is the accepted equilibrium constant for ferric thiocyanate [FeSCN2+]? I can't find a reliable number anywhere. Thanks in advance.

asked by CHeem on June 30, 2010
71. ### chm

If 0.0490g of AgIO3 DISOLVES per liter of solution, calculate the solubility product constant.

asked by ami on June 27, 2010
72. ### chemistry

what is the standard enthalpy formation of liquid diethylamine (CH3CH2)2 NH? N2O5(g) + 8CH4(g) ==> 2(CH3CH2)2NH(l) +5H2O(l), delta H= -1103kJ

asked by Ellie on June 21, 2010
73. ### accounting

"Harris Company manufactures and sells a single product. A partically completed schedule of the company's total and per unit cost over the relevant range of 30,000 to 50,000 per units produced and sold are: United produced and Sold: 30,000 ; 40,000; 50,000

asked by denise on June 3, 2010
74. ### Calculus

A cylindrical metal can is made to hold 500ml of soup. Determine the dimensions of the can that will minimize the amount of metal required(assume that the top and sides of the can are made from metal of the same thickness

75. ### Physics

What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?

asked by Katie on June 8, 2010
76. ### Statistics

find z such that 97.5% of the standard normal curve lies to the left of z

asked by John on June 14, 2010
77. ### chemistry

When 25ml of 0.10 mol/l HBr is titrated with 0.10 mol/l NaOH, what is the pH at the equivalence point?

78. ### Chemistry

What is the pH at the equivalence point for the titration of 0.26M CH3NH2(aq) with 0.26M HClO4(aq)? For CH3NH2, Kb = 3.6 x 10^-4. I arrived to the answer of pH=5.57 but its wrong. Can you tell me why it is wrong? Thanks!

asked by Ron A. on June 5, 2010
79. ### chemistry

what mass in grams of a molecular substance (mole weight=50.0g/mol) must be added to 500g of water to produce a solution that boils at 101.56(degrees)C?

asked by jimbo on June 26, 2010
80. ### Algebra 2 Honors

what is the exact value of tan375degrees

asked by Haley on June 6, 2010
81. ### chemistry

what pressure (in atm) is exerted by a column of mercury 1.4O high? The density of mercury is 13.5951 g/cm3.

asked by Alex on June 18, 2010
82. ### english

Read the lines from Wordsworth's "Tintern Abbey." The sounding cataract Haunted me like a passion: the tall rock, The mountain, and the deep and gloomy wood, Their colours and their forms, were then to me An appetite: a feeling and a love, That had no need

asked by Courtney on June 3, 2010
83. ### language

A poem's underlying message or concept _____. 1 poetic diction 2 tone 3 atmosphere 4 all of these 5 none of these I think its the tone? Is this right?

asked by Courtney on June 2, 2010
84. ### algebra

You've received an invoice for \$3,000 with terms of 3/10, 1/20, n/30. How much will you have to pay if you pay the bill in 12 days?

asked by nisha on June 22, 2010
85. ### Chemistry

10.0 mol of ammonia gas is injected into a 4.0 L container. At equilibrium 1.2 mol of nitrogen gas is found in the container. The number of moles of ammonia gas left in the container must be which of the following? N2(g) + 3H2(g) 2NH3(g) + 94 kJ a. 8.8 d.

asked by Alicia on June 8, 2010
86. ### Calculus

AN ISOSCELES TRIANGLE IS TO HAVE A PERIMETER OF 64CM. DETERMINE THE SIDE LENGTHS OF THE TRIANGLE IF THE AREA IS TO BE A MAXIMUM.

asked by Anonymous on June 17, 2010
87. ### Geometry

Which statement is true? A. The altitude drawn to the leg of a right triangle forms two triangles that are similar to each other and to the given triangle. B. The altitude drawn to the hypotenuse of a right triangle forms two triangles that are similar to

asked by Superman on June 30, 2010
88. ### chemistry

I need to find how many grams phosphorus (P) are in 0.8645 g sample of MgNH4PO4 x 6H2O How many grams P2O5 can be calculated with this many grams of P What is the percent P (as P2O5) in this

asked by Jamie on June 14, 2010
89. ### chemistry

How many atoms does 2.0 moles of He represent?

asked by HELP!!! on June 19, 2010

The proceeds of a \$7,500.00, 10% simple discounted note for 85 days is:

asked by efi on June 22, 2010
91. ### Chemistry

CuSO4(aq) + 4NH3(aq) → [Cu(NH3)4]SO4(aq) I know that adding nitric acid will reverse the reaction. But what is the actual chemical equation? [Cu(NH3)4]SO4(aq) + HNO3(aq) --> ???

asked by elin on June 10, 2010
92. ### physics

Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of

asked by brandon on June 10, 2010
93. ### statistic

Jim has a 5-year-old car in reasonably good condition. He wants to take out a \$30,000 term (that is, accident benefit) car insurance policy until the car is 10 years old. Assume that the probability of a car having an accident in the year in which it is x

asked by john on June 26, 2010
94. ### English

1. Change the numbers into the Arabic numerals. 2. Change the numerals into the Arabic numerals. 3. Write the Arabic numbers in English. (Are they all grammatical?)

asked by rfvv on June 23, 2010
95. ### Chemistry

What is the equation for the synthesis of isopropyl butanoate from isopropanol and butanoic acid

asked by Mary on June 11, 2010
96. ### Chemistry

Help with the equation for the synthesis 2-chlorobutane from 1-butene and hydrogen chloride for bromobenzene from benzene and bromine I came up with 1C6H6+1Br2->1C5H6Br+1HBr is this correct?

asked by mary on June 8, 2010
97. ### Physics

Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?

asked by Ashley on June 8, 2010
98. ### chemistry

the molar mass of an unknown gas was measured by an effusion experiment. it took 63s for te gas to effuse. where as nitrogen gas took 48sec. what is the molar mass of the gas? 32g/mol 37g/mol 24g/mol 16g/mol 48g/mol

asked by Ellie on June 21, 2010
99. ### chemistry

The equilibrium constant for the following reaction is 5.0 at 100c. If an equilibrium mixture contains [No2]=0.50 M, what is the [N2O4]? 2No2(g) N2O4 (g) I do not understand if the Kc is 100c or where that plays in!

asked by samantha on June 23, 2010
100. ### 10th chemistry

what mass of sucrose, C12H22O11, is needed to make 300.0 mL of a .50M solution?

asked by Kay on June 2, 2010