15. Buffers in the human body
(A)Help to maintain a constant blood pH.
(B)Help to keep the body temperature constant.
(C)Help change the blood plasma pH when foods are eaten.
(D)Precipitate proteins so enzymes are inactive.
(E)none of these

1. How many protons, neutrons, and electrons does \(^{56}\text{Fe}\) have? (A)26 protons, 26 neutrons, 30 electrons (B)26 protons, 24 neutrons, 56 electrons (C)30 protons, 26 neutrons, 26 electrons (D)26 protons, 30 neutrons, 26 electrons (E)56 protons, 26 neutrons, 56 electrons

2. Which formula is not correct? (A)Na₂O (B)K₃PO₄ (C)HCN (D)SrCl₂ (E)Al₂O₃

3. What is the molar mass of ethanol (C₂H₅OH)? (A)45.07 (B)38.90 (C)46.07 (D)34.17 (E)62.07

4. To calculate the concentration in molarity of a salt solution, you need to know (A)The mass of the salt added and the volume of water added to the solution. (B)The mass of the salt added to the solution and the total volume of the solution. (C)The mass of the salt added, the molar mass of the salt, the volume of water added to the solution. (D)The molar mass of the salt and the total volume of the solution. (E)The mass of the salt added, the molar mass of the salt, the volume of water added, and the total volume of the solution.

5. An aqueous solution of silver nitrate is added to an aqueous solution of potassium chromate and this reaction produces a solid. What is the formula for the solid? (A)AgK (B)AgCrO₄ (C)KNO₃ (D)K₂NO₃ (E)Ag₂CrO₄

6. Aqueous solutions of sodium sulfide and copper (II) chloride are mixed together. Which statement is correct? (A)Both NaCl and CuS precipitate from solution. (B)No precipitate forms. (C)CuS will precipitate from solution. (D)NaCl will precipitate from solution. (E)No reaction will occur.

7. Which contains the largest number of molecules? (A)flask A (B)flask B (C)flask C (D)all are the same (E)none

8. In which flask are the molecules least polar and therefore most ideal in behavior? (A)flask A (B)flask B (C)flask C (D)all are the same (E)none

9. In which flask do the molecules have the highest average velocity? (A)flask A (B)flask B (C)flask C (D)all are the same (E)none

10. Consider a sample of neon gas in a container fitted with a moveable piston (assume the piston is massless and frictionless). The temperature of the gas is increased from 20.0 °C to 40.0 °C. The density of neon (A)Increases less than 10%. (B)Decreases less than 10%. (C)Increases more than 10%. (D)Decreases more than 10%. (E)Does not change.

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