Short Answer Practice

A fish tank consists of a bowl with water in it. Explain why both Henry’s law and Raoult’s law are important to this system (assuming you care about your fish and live in a part of the country with dry air).

Chapter 6

Short Answer Practice

Suppose nitrogen has a Henry’s coefficient of 1x103 bar in water and oxygen has a Henry’s coefficient of 4x103 bar in water. What is the ratio of the mole fraction of nitrogen to the mole fraction of oxygen in water assuming the air above it is at atmospheric conditions?

Chapter 6

Short Answer Practice

A sealed container contains both liquid and vapor composed of benzene and toluene at pressure P and 90 °C. The mole fraction of benzene in the liquid phase is x. Will the mol fraction of benzene in the vapor phase (y) be greater than, equal to, or less than x? Justify your answer. (this should take < 1 minute)

Chapter 6

Short Answer Practice:

• Would injecting CO2 beneath the ocean floor be a good long term storage solution? Why?

• What would be the effect of increased CO2 levels in the ocean on the pH? What about increased temperature?

Chapter 6

Short Answer Practice:

If the “greenhouse effect” results in the oceans warming, what will happen to the CO2 dissolved in the ocean? What equation relates this effect?

Chapter 6

Short Answer Practice:

• Which cooks faster, an egg in salt water or an egg in fresh water?

Chapter 6

Short Answer Practice:

• At a Carolina Hurricanes game, you notice wisps of fog near the surface of the ice. What are those wisps (phase and species) and how do they form?

Chapter 6

Short Answer Practice:

• Explain why the vapor leaving the spout of a whistling tea kettle is transparent, but appears hazy farther from the spout.

Chapter 6

Short Answer Practice:

• A cold can of soda is opened. Describe the state of the can’s contents before the can is open. What happens upon opening the can? Describe this in terms of Henry’s Law.

• A warm can of soda is opened. How does this differ from the previous example?

Chapter 6

Short Answer Practice:

• Using Raoult’s law as a basis, explain why your throat may feel dry when you wake up on a winter morning. Why do some people use humidifiers in the winter?

Chapter 6

Short Answer Practice

Suppose the gas in your car is a vapor-liquid mixture of four hydrocarbons. You know that the tank is at 25°C. Based on the degree of freedom analysis, how many other intensive variables must be determined before the other intensive variables can be calculated?

Chapter 6

Short Answer Practice

Does it take longer to cook a hard-boiled egg at a ski resort or at the beach? Why?

Chapter 6