Exam 8: How Water Behaves

Dip a paper clip into water and then slowly pull it out. You'll find that for a short distance, the water is brought up with the metal. Are these adhesive or cohesive forces at work?

If the heat of melting of a sample is 135 J/g, how much heat would be required to melt 5.00 grams of material?

Given the following specific heats and that each sample had the same mass, which would require the greatest amount of heat energy to increase its temperature 50°C?

Maple syrup is made from the sap of the sugar maple tree. Why does is take so much energy to make maple syrup?

Surface tension is the ________.

Why are polar oceans most fertile in the autumn?

If water had a lower specific heat, would ponds be more likely to freeze or less likely to freeze?

What is the temperature change if you cool water from 100°C to 55°C?

The formation of hydrogen bonds between water molecules ________.

Why does adding heat to ice-water disfavor the rate of ice formation?

Your inventor friend proposes a design of cookware that will allow boiling to take place at a temperature less than 100°C so that food can be cooked with less energy. Comment on this idea.

Why does evaporation of a liquid also cool the gas above it?

Given the following specific heats and that each sample had the same mass, which of the following materials would cool the fastest?

Would you expect the surface tension of water to increase or decrease with temperature?

Which of the following statements does not describe a property of water?

Heat is absorbed by a substance when that substance ________.

Why does water not freeze at 0°C when either ions or molecules other than O are present?

From the diagram above describing the phase of xenon relative to temperature and pressure which is more dense: liquid xenon or solid xenon?

If all of the capillaries pictured above were the same size diameter, which would contain the liquid with the greatest capillary action?

How much heat is required to raise the temperature of 100,000 grams of iron by 30°C?