Homework Assignment #8

Chapter 8.2-8.3; 9.1-9.2 Due: Monday, November 2 by 11:59 pm

1. True or False. Gases are highly compressible.

1. According to the Kinetic Molecular theory, why do gases have low densities?

1. True or False. The volume of the gas inside a balloon is the same as the volume of the balloon.

1. Boyle’s Law explains which of the following?
2. how hot air balloons float
3. why compressed air canisters must be kept cool
4. how breathing works
5. why the tire air pressure may change when the seasons change
6. True or False. The volume and temperature of an ideal gas are directly proportional if amount and pressure are constants.

1. True or False. Intermolecular forces (IMFs) are present and may affect the behavior of nonideal (“real”) gases.

1. What is the pressure (in atm) of 0.0255 moles of gas if it has a volume of 105.2 mL at a temperature of 45 °C? Hint: R = 0.08206 (L·atm)/(mol·K)

1. What is volume (in L) of 1.29 moles of gas at a temperature of 285 K and a pressure of 0.924 atm? Hint: R = 0.08206 (L·atm)/(mol·K)

1. For each pair of covalent compounds, which one is expected to be more soluble in water and why?
2. C₂H₆ vs. C₂H₅OH
3. CH₂F₂ vs. H₂
4. PH₃ vs. NH₃

10.) For each ionic compound, predict whether it should be soluble or insoluble in water and explain why.

1. LiF
2. Cu(NO₃)₂
3. Ni(OH)₂
4. K₃PO₄
5. True or False. The solubility of most solid solutes in water decreases with increasing temperature.
6. How many mL of a 3.00% w/v H₂O₂ solution are needed to provide 15.0 g H₂O₂?