# Exercise 7

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 UC Davis CHE 2A: General Chemistry  Instructor: Hayashi Chem 2A        Chem 2B        Chem 2C Reading Assignments Exercises Worksheets Homework Unit I: Atomic Theory            Unit II: Chemical Reactions           Unit III: Gases          Unit IV: Electronic Structure and Bonding

 1. The pressure of a gas will ? when the volume is decreased and will ? when the absolute temperature is decreased. (a) increase...increase (b) increase...decrease (c) decrease...increase (d) decrease...decrease 2. If the absolute temperature of a gas is doubled and the pressure of the gas is halved, how will the volume change? (a) It will increase by two times its original value. (b) It will decrease to one fourth of its original value. (c) It will stay the same as its original value. (d) It will increase by four times its original value. 3. If both the volume and the pressure of a gas are doubled, how will the temperature change? (a) It will increase by two times its original value. (b) It will decrease to one fourth of its original value. (c) It will stay the same as its original value. (d) It will increase by four times its original value. 4. How many milliliters of 2 M NaCl solution are required to make 1 liter of 0.4 M NaCl solution? (a) 5,000 mL (b) 800 mL (c) 200 mL (d) 0.2 mL 5. If an air bag in a car needs 44.8 L of gas when filled, how many grams of NaN3 are needed to fill the bag with nitrogen gas at standard temperature and pressure? Remember that one mole of any gas will occupy 22.4 L at STP. The balanced chemical is... (a) 56 grams (b) 87 grams (c) 130 grams (d) 1.3 grams 6. How many grams of NaOH are needed to make 100 milliliters of a 0.2 molar solution of NaOH? (a) 0.02 grams (b) 0.8 grams (c) 20 grams (d) 800 grams 7. How many grams of NaHCO3 (baking soda) would you need to neutralize 500 mL of battery acid (H2SO4) that has been spilled on your garage floor? Assume that the concentration of the battery acid is 12 molar. The balanced chemical equation is... (a) 1,008,000 grams (b) 1,008 grams (c) 504 grams (d) 252 grams 8. The solubility of a gas will _?_ when a solution containing the gas is heated and the solubility of a gas in a solution will _?_ when the pressure over the solution is decreased. (a) decrease...decrease (b) decrease...increase (c) increase...decrease (d) increase...increase 9. If 16 grams of O2 react with excess C2H6, how many grams of CO2 will be formed? The formula mass of O2 = 32 amu and the formula mass of CO2 = 44 amu. The balanced chemical equation is... (a) 22 grams (b) 13 grams (c) 9 grams (d) 7 grams 10. If 64 grams of O2 react with 45 grams of C2H6, how many grams of CO2 will be formed? The formula mass of O2 = 32 amu, C2H6 = 30 and the formula mass of CO2 = 44 amu. The balanced chemical equation is... (a) 132 grams (b) 66 grams (c) 50 grams (d) 44 grams