Review for January Exam #5

1.     Gold melts at 1063 C and boils at 2970 C. Mention what forms of motion (rotation, translation, vibration) apply to gold atoms at each of the following temperatures.

a.     -273 C

b.    200 C

c.     1500 C

d.    3244 K

2.     By what factor will the pressure of a gas change if its volume is compressed from 20 L to 15 L while its temperature increases from 20 C to 30 C ?

3.     A tank containing hydrogen (H2) weighs 40.15 kg. The mass of the empty tank was 40.00 kg. According to the manometer, the pressure is 500 kPa; its temperature is 20 C. What is the volume of the tank? Is it big enough to supply you with a litre per day for a year?

4.     Fe + 0.5 O2 FeO + 266.5 kJ

2 Fe + 1.5 O2 Fe2O3 + 822.2 kJ

Find the amount of heat involved in the formation of 1 mole of Fe2O3 from O2 and FeO.

5.     Ludovic poured 200 mL of a 0.1 mol/L LiOH solution into a 300 mL solution of acetic acid. The neutralization effect increased the temperature of the aqueous solution from 20 to 35 C.

Calculate the molar heat of reaction per mole of LiOH.

6.     A group of students is trying to produce the largest quantity of hydrogen gas in the shortest time possible. They receive 1 g of Mg and 500 mL of 0.5 HCl.

o       They cannot increase the amount of magnesium or acid

o       There is no catalyst available in their cheap school.

What two things can they still do to increase the rate?

7.Given: Fe + 0.5 O2 FeO

Find the rate at which FeO is produced in moles/minute if a mg of oxygen is consumed every second.

8 SKIP. a.How do preservatives slow down the rate of oxidation in wine or cereal?

b.Give examples of how catalysts play a role in the natural production of oxygen in the atmosphere and in the unnatural destruction of ozone.

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Created:April/6/1996; Updated:Dec/26/2008