# Questions Asked onMarch 16, 2010

1. ## Chemistry

What is the colour of: 1. Cu+ 2. Cu2+ 3. Cu3+?

2. ## Physics

An ice cube is placed in a microwave oven. Suppose the oven delivers 105 W of power to the ice cube and that it takes 32,200 J to melt it. How long does it take for the ice cube to melt?

3. ## chemistry

At 2200 degrees celsius,kp=0.050 for the reaction: n2(g)+O2(g) ->2NO(g)

4. ## Islam

How did Islamic civilization spread to encompass such an extensive empire(in the Middle East)? What practices or methods were used to spread Islam? P.S: If Ms.Sue answers this, PLAESE GIVE ME ENOUGH INFORMATION TO WRITE ON A ESSAY, I HELP WITH THIS,

5. ## Physics

A room has a volume of 120 m^3. An air-conditioning system is used to replace the air in the room every twenty minutes, using ducts that have a square cross ection. Assuming that air can be treated as an incompressible fluid, calculate the length of a side

6. ## chemistry

a 500.0 mL gas sample at STP is compressed to a volume of 300.0 ml and the temperature is increased to 35.0 C. What is the new pressure of the gas in pascals?

7. ## Chemistry

Which test for iron(II) ions is conclusive?

8. ## Probability/Math

Find the probability that a randomly thrown dart will land in the shaded area of the dartboard. A square that is 6ft width by 6ft length 4ft width by 9ft length.

9. ## Physics

If you are wearing a watch, what energy changes are taking place in it right now?

10. ## chemistry

Which of the following molecules is polar? 1. CH4 2. BH3 3. NH3 4. CF4 5. H2

11. ## Math

Write an equation to describe the variation. Use k for the constant of proportionality. x varies directly as the square of y and inversely as z

12. ## chemistry

A 24L sample of a gas at fixed mass and constant temperature exerts a pressure of 3.0 atm. What pressure will the gas exert if the volume is changed to 16L?

13. ## chemistry

The traditional method of analyzing the amount of chloride ion present in a sample was to dissolve the sample in water and then slowly add a solution of silver nitrate. Silver chloride is very insoluble in water, and by adding a slight excess of silver

14. ## English

How do I write a paragraph naming three possible agendas and one example of each that you might find in the media?

15. ## Math

Write one numerical expression and one algebraic expression. Then explain what the differnce between a numerical and algebraic expression is.

16. ## Chemistry

How does the Diethylacetal impurity arise in fermentation?

17. ## chemistry

A common laboratory system to study Boyle's law uses a gas trapped in a syringe. The pressure in the system is changed by adding or removing identical weights on the plunger. The original gs volume is 50.0 ml when two weights are present. Predict the new

18. ## Chemistry

Calculate how many milliliters of carbon dioxide would be produced theoretically from 2.0g of sucrose at 25 deg Cel and 1 atm pressure.

19. ## Chemistry

How would each of the folowing affect the accuracy of the calculated neutralizing power of the antacid (too high, too low, no effect)? Explain why. a) Titration flask was wet with distilled water b) The burette was initally not rinsed with 0.10M NaOH and

20. ## calculus HELP URGENT

Find the equation of the line through the point (3,4) which cuts from the first quadrant a triangle of minimum area.

21. ## College Physics

Two 72.0-kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 130 degrees , what is their speed after the collision?

22. ## math

What is the value of the y-coordinate of the solution to the system of equations x + 2y = 9 and x - y = 3?

23. ## physics

A stubborn, 120 {\rm kg} mule sits down and refuses to move. To drag the mule to the barn, the exasperated farmer ties a rope around the mule and pulls with his maximum force of 800 {\rm N}. The coefficients of friction between the mule and the ground are

24. ## Chemistry

A buffer solution of volume 100.0 mL is 0.150 M Na2HPO4(aq) and 0.100 M KH2PO4(aq). Refer to table 1. (a) What are the pH and the pH change resulting from the addition of 80.0 mL of 0.0500 M NaOH(aq) to the buffer solution? pH pH change (include negative

25. ## College Physics

You are holding a shopping basket at the grocery store with two 0.69-kg cartons of cereal at the left end of the basket. The basket is 0.90 m long. Where should you place a 1.8-kg half gallon of milk, relative to the left end of the basket, so that the

26. ## physical science

An electric current heats a 225 g copper wire from 20.0 °C to 40.0 °C. How much heat was generated by the electric current? (ccopper = 0.093 cal/gm-deg)

27. ## math

Which has the lower unit price? Soap. brand A:$1.34 for 3 bars. brand B:$1.44 for 4 bars. i think it is b.

28. ## physics

single-slit diffraction pattern is formed when light of 680.0 nm is passed through a narrow slit. The pattern is viewed on a screen placed one meter from the slit. What is the width of the slit (mm) if the width of the central maximum is 2.69 cm?

29. ## College Chemistry Lab

For the following mixture, determine the initial concentration of Fe^3+. 0.00250M Fe^3+ --- 8.00mL 0.00250M SCN^- --- 7.50mL 0.10M HNO3 --- 4.50mL

30. ## math

On each of four consecutive plays in a football game, a team lost 11 yd. If lost yardage is interpreted as a negative integer, write the information as a product of integers and determine the total number of yards lost.

31. ## Algebra

While traveling in a car, the centrifugal force a passenger experiences as the car drives in a circle varies jointly as the mass of the passenger and the square of the speed of the car. If the a passenger experiences a force of 100.8 newtons when the car

32. ## English

1. She is good at dancing. 2. She is good at dance. (Which one is correct? Are both correct?) 3. I am a student at Class 1-1. 4. I am a student in Class1-1. 5. I am in Class 1-1. 6. I am a first year student in Class 1-1. 7. I am a first grader of Class

33. ## math

if logx y=2, whic of the following is true?

34. ## College Chemistry Lab

Determine the molarity of FD&C Yellow #5 in the following solution that's prepared by mixing the dye solution with water and alcohol. None of the solutes react with one another. 6.35x10^-5M FD&C Yellow #5 = 6.50mL deionized water = 6.50mL ethyl alcohol =

35. ## pyhsical science

How much heat is necessary to vaporize 100 g of water at 100 °C to form steam at 100 °C?

36. ## Trig

A body of unknown mass is attached to an ideal spring with k=120 n/m. it is found to vibrate with a frequency of 4 Hz. find the period the angular frequency and the mass of the body

37. ## Biology - Pregnancy

"If the ovaries were removed between the start of pregnancy and the second month then.....because....." "If the ovaries were removed after the second month....." I'm confused because I thought that once pregnancy begins, no more ovulation occurs until

38. ## chemistry

A sample of argon gas occupies a volume of 950 mL at 25.0C. What volume will the gas occupy at 50.0C if the pressure remains constant?

39. ## Chemistry

The pH of 0.50 M HBrO(aq) is 4.50. Calculate the change in pH when 6.50 g of sodium hypobromite is added to 110. mL of the solution. Ignore any change in volume. Ka of HBrO is 2E-9 I found the amount of moles used for each (.0547 mol NaBrO, and .055 mol

40. ## chemistry

What are the probably products of... a) an aqueous solution of two ionic compounds b) a single compound c) two elements d) oxygen and a compound of carbon and hydrogen ?

41. ## Chemistry

Copper(II) chloride and lead(II) nitrate react in aqueous solutions by double replacement. Write the balanced chemical equation, the over all ionic equation, and the net ionic equation for this reaction. If 16.06g of copper(II) chloride react, what is the

42. ## chemistry

before beginning a titration, the burnet was not clean. after completing the titration,the student noticed that droplets of the titrant were clinging to the inside surface of the barrel.wolud the molarity be too high or too low?

43. ## physical science

How much heat must be removed from 500 g of water at 0 °C to form ice at 0 °C?

44. ## physics

an aluminum object has a mass of 27 kg & a density of 2700 kg/m^3. it is hung from a rope under the surface of water (density=1000 kg/m^3). what is the volume of the object and the tension in the string, while the object hangs from it & also under the

45. ## Chemistry

Identify the precipitate formed when solutions of these compounds are mixed. H2SO4 + BaCl2 ==> So when you do the double replacement reaction, would the products of this chemical equation be HCl + BaSO4? or H2Cl2 + BaSO4 ? (not balanced) also would both of

46. ## geometry

What is the volume of a cone with a radius of 3 and a height of 19?

47. ## physics

A 24V battery of internal resistance of 10ohms is connected to a variable resistor. At what value of current drawn from battery the rate of heat produced by the resistor is maximum? Hence find its value.

48. ## geometry

Two sides of a triangle measure 2x – 4 and 7x – 2 units, respectively. Which of these is a possible length for the third side of the triangle?

49. ## world history

Which has been a major change resulting from the industrialization of Western Europe? 1.increased social mobility 2.increased political power for the nobility 3.shrinking of the influence of the middle class 4.shift in wealth from northern to southern

50. ## trigonometry ?

A cottage under construction is to be 15.6m wide. The two sides of the roof are to be supported by equal rafters that meet at a 52 degree angle. Determine the length of the rafters to the nearest cm using a) the cosine law b) the sine law I am not

51. ## physical science

How much heat is necessary to vaporize 100 g of water at 100 °C to form steam at 100 °C?

52. ## Chemistry

1x10-2 mol of MgSO4 (Ksp = 9) is added to 1 L of water. Will 1x10-5 mol of CaSO4 (Ksp = 10-6) completely dissolve in the solution? I think the answer is yes...because the Q will be less than Ksp of 10^-6?? Which of the following salts would you expect to

53. ## BIS 155 Data Analysis w/Spreadsheet

How would I begin to compile data into useable data in using Excel?

Which of the following is the most important step to help improve America's business ethics

204. ## Math

Find A �� B, given A = {people who are less than 20 years old} and B = {people who have a job}. A) {people who are less than 20 years old and people who have a job} B) {people who are less than 20 years old and have a job} C) {people who are

205. ## statistics

in certain manufacturing processes parts must be machined tonwithin specified tolerences. the parts must have a mean length of of six inches plus or minus 0.26 inches .A SAMPLING PROCEDURE HAS BEEN ESTABLISHED to determine wether the ten parts are within

x+3=5 x+4=9

207. ## math

how are functions connected to right triangles?

208. ## english

what is a good adverb for put

209. ## world geography

since the 1970 european have tired to limit