2.How many significant figures are there in the number 0.04560700?
(A) 4
(B) 5
(C) 7
(D) 8

3.A method of separation that employs a system with two phases of matter, a mobile phase and a stationary phase, is called (A) filtration (B) chromatography (C) distillation (D) vaporization

4.Which of the following statements from Dalton's atomic theory is no longer true, according to modern atomic theory? (A) Elements are made up of tiny particles called atoms. (B) Atoms are not created or destroyed in chemical reactions. (C) All atoms of a given element are identical. (D) Atoms are indivisible in chemical reactions.

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

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