Chemistry Problems

CHEM B GIFTED FINAL EXAM REVIEW- Problems

6. Calculate the percent yield of water if 345g are produced when the theoretical yield was

547 g.

7. Calculate the pH corresponding to each of the hydrogen ion concentrations given below.

Tell whether the solution is acidic, basic, or neutral

a. [H+]= .00100 M c. [H+] = 9.18 x 10-11 M

b. [H+] = 2.19 x 10-4 M d. [H+] = 4.71 x 10-7 M

8. Calculate the hydronium ion concentration and pH for the following:

a. 1.04 x 10-4 M HCl c. 5.41 x 10-4 M HClO4

b. .00301 M HNO3

9. The air in a balloon has a volume of 6.00 L and exerts a pressure of 230. kPa at 500. K. What pressure does the air in the balloon exert if the temperature is increased to 600. K and the air is allowed to expand to 18.0 L?

10. When 1000. ml of Oz gas at 25 oC and 1.045 atm is cooled to -50.0 C and the pressure is increased to 4.00 atm, what is the new volume of the gas sample?

11. Helium occupies a volume of 3.8 L at -45 oc. What volume will it occupy at 75oC?

12. What is the difference between miscible and soluble?

13. Describe the difference between a solution and a suspension.

15. Is an alloy a solution? If so, why? In an alloy, what is the solute and solvent.

Use chart for 16-18.

16. For 150 g of NaNO3 to dissolve in 100. g of water, the water must be at what temperature?

17. How much Ce2(SO4)3 can be dissolved in water at 5oC?

18. What is the maximum amount of KCl that can be dissolved at 70oC?

19. What mass of LiF is there in 3.50 L of a 1.50 M solution?

20. What volume (in ml) of 23.0 M HBr is needed to contain 7.80 mol of HBr?

21. To how much water should 200. g of H2SO4 be added to prepare a 3.0 M solution?

22. How many moles of LiBr are contained in 500. ml of a 0.25 M solution?

23. For the synthesis of sodium chloride, calculate the percent yield if 200. g of chlorine react with excess sodium to produce 240. g of sodium chloride.

GENERAL REVIEW

1. How does gas solubility change as temperature changes?

2. How can you identify whether a substance is an electrolyte or nonelectrolyte?

3. What factors affect the rate of dissolving?

4. What is the main idea of the kinetic-molecular theory?

5. What is a Bronsted- Lowery acid and base?

6. How do conjugate acids and conjugate bases form?

7. What is gas compression? Effusion? Diffusion?

8. How do you find a mole ratio?

9. In what type of problems is a mole ratio used? How often?

1 O. What happens to pressure and volume of gases as temperature increases and decreases?

11. How do you find a limiting reactant?

12. What is a titration?

13. When would a percent yield be equal to 100%, and when would it be less?

14. What happens in a reaction when the limiting reactant runs out?