5. Which is NOT capable of H-bonding?
A. C2H6 B. H2O C. NH3 D. HF
6. Which is TRUE about colligative properties of solutions?
A. depend on the number of solvent particles C. have different origin
B. depend on the nature of solutes D. solutes may be atoms, molecules or ions
7. Which of the following is NOT a colligative property?
A. freezing pt lowering B. boiling pt elevation C. osmotic pressure D. density
8. A solution whose concentration is the same as that of a standard solution is called A. neutral B. hypotonic C. hypertonic D. isotonic
9. It is the area of chemistry concerned with the speed or rate at which a
10. The rate of reaction measures how fast a reactant is consumed or a product is formed. The rate is expressed as the ratio of the change in the concentration to elapsed time.
A. Only the first statement is correct. C. Both statements are correct. B. Only the second statement is correct. D. Both statements are incorrect.
11. Consider the reaction H2O(l) + heat H2(g) + O2(g) : Increasing the amount the water means a shift of equilibrium to the
A. left B. right C. left then right D. no shift
12. Increasing pressure means a shift of equilibrium to the
A. left B. right C. left then right D. no shift
13. Adding a catalyst in a reversible reaction means a shift of equilibrium to the
A. left B. right C. left then right D. no shift
14. It is defined as the negative logarithm of the hydrogen ion concentration in mol/L.
A. pH B. pOH C. pHOH D. H+
15. Which of the following is least acidic?
A. exposed water B. saliva C. vinegar D. urine
16. A solution contains 10g alcohol and 100g water. What is the % by mass concentration of the solution?
A. 1% B. 9% C. 10% D. 11%
17. Molecules of a liquid can pass into the vapor phase only under which of the following conditions?
A. Atmospheric pressure is less than 640 mm Hg.
B. The vapor pressure of the liquid is greater than the atmospheric pressure.
C. The temperature of the liquid exceeds the liquid’s normal boiling point.
D. The molecules have sufficient kinetic energy to overcome the intermolecular forces in the liquid.
18. Liquid boil at lower temperatures at higher elevations because
A. The intermolecular forces are weaker. C. the atmospheric pressure is greater. B. The intramolecular forces are weaker. D. vapor pressure at which boiling occurs is lower.
19. Which of the following statements about solutions in INCORRECT?
A. A solution is a homogeneous mixture.
B. Solutions in which both solute and solvent are solids are possible.
C. Solutions readily separate into solute and solvent if left undisturbed for 24 hr.
D. The substance present in the greatest amount is considered to be solvent.
20. What is the concentration, in mass percent, of a solution that contains 20.0 grams of NaCl dissolved in 250.0 grams of water?
A. 6.76% B. 7.41% C. 8.00% D. 8.25%
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