5.Which of the following are incorrectly paired?
(A) K, alkali metal
(B) Ba, alkaline earth metal
(C) O, halogen
(D) Ne, noble gas

6.NaHCO3 is the active ingredient in baking soda. How many grams of oxygen are in 0.52 g of NaHCO3? (A) 0.099 g (B) 0.019 g (C) 6.19× 103 g (D) 0.30 g

7.What volume of 18 M sulfuric acid must be used to prepare 2.30 L of 0.145 M H2SO4? (A) 19 mL (B) 0.33 mL (C) 1.1×103 mL (D) 2.9 mL

8.Which of the following salts is insoluble in water? (A) Na2S (B) K2CO3 (C) Pb(NO3)2 (D) All of these are soluble in water.

9.In the reaction N2(g) + 3H2(g) → 2NH3(g), N2 is (A) oxidized (B) reduced (C) the electron donor (D) the reducing agent

10.Boyle's law states that: (A)Equal amounts of gases occupy the same volume at constant temperature and pressure. (B) The volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature. (C) The volume of a fixed amount of gas is directly proportional to its temperature in Kelvin at constant pressure. (D)The total pressure of a mixture of gases is the simple sum of the partial pressure of all of the gaseous compounds.

11.Body temperature is about 309 K. On a cold day, what volume of air at 276 K must a person with a lung capacity of 2.2 L breathe in to fill the lungs? (A) 2.46 L (B) 1.97 L (C) 2.08 L (D) 3.93 L

12. The partial pressures of CH4, N2, and O2 in a sample of gas were found to be 135 mmHg, 508 mmHg, and 571 mmHg, respectively. Calculate the mole fraction of nitrogen. (A) 20.4 (B) 0.470 (C) 0.418 (D) 0.751

13.Calculate the work associated with the expansion of a gas from 42.0 L to 79.0 L at a constant 14.0 atm. (A) 518 L·atm (B) –518 L·atm (C)–1.11×103 L·atm (D) 588 L·atm

14. Which of the following properties is (are) intensive properties? I.mass II.Temperature III.Volume IV.Concentration V.energy (A) I, III, and V (B) II only (C) II and IV (D) III and IV

15. Fe has __________ that is (are) unpaired in its d orbitals. (A) one electron (B) two electrons (C) three electrons (D) four electrons

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