Question 1

From the diagram above describing the phase of water relative to temperature and pressure, is it possible for ice to transform to water vapor (sublime) without ever becoming liquid? At which point on the diagram does this occur?

Accepted Answer

Yes, water can be made to sublime without becoming liquid. This occurs at point D on the diagram, which represents low pressure and low temperature conditions.

Question 2

From the diagram above describing the phase of xenon relative to temperature and pressure what is the phase of xenon at  and  ?

Accepted Answer

The answer of From the diagram above describing the phase...

Question 3

Why does evaporation cool a liquid?

Accepted Answer

When molecules evaporate from the surface of a liquid, they take away some kinetic energy with them. This results in a decrease in the average kinetic energy and temperature of the remaining liquid molecules, leading to cooling of the liquid.

Question 4

Which statement best describes what is happening at the surface of liquid water?

Accepted Answer

All the statements describe processes that occur at the surface of liquid water. A) describes the dynamic equilibrium between liquid and gaseous states. B) and C) detail how water molecules can enter or leave the liquid state based on their kinetic energy. D) generalizes the exchange process between the two states.

Question 5

What is the boiling temperature of a single water molecule? Does this question make sense?

Accepted Answer

Boiling involves the separation of many molecules (plural). With only one molecule, the concept of boiling is meaningless.

Question 6

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

Accepted Answer

The answer of Why does evaporation of a liquid also...

Question 7

From the diagram above describing the phase of water relative to temperature and pressure, at which point does water exist in all three phases?

Accepted Answer

The point where water exists in all three phases (solid, liquid, and gas) simultaneously is known as the triple point. This specific condition of temperature and pressure allows all three phases to coexist in equilibrium.

Question 8

How are pressure and the boiling point of a compound related?

Accepted Answer

The boiling point of a compound decreases as the external pressure decreases because the molecules require less energy to escape into the gas phase.

Question 9

A gold ring cannot sit on the surface of water, but a thin gold wire loop of the same diameter can. Why?

Accepted Answer

The answer of A gold ring cannot sit on the...

Question 10

Does soap increase or decrease water's surface tension?

Accepted Answer

Soap decreases water's surface tension by disrupting the hydrogen bonds between water molecules. This allows the water to spread more easily, which is why soap is effective at cleaning.

Question 11

Why does sweat cool you off?

Accepted Answer

When sweat evaporates from the skin, it absorbs heat from the skin, which cools down the body. This process is called evaporative cooling.

Question 12

From the diagram above describing the phase of water relative to temperature and pressure, at which point is water boiling?

Accepted Answer

The answer of From the diagram above describing the phase...

Question 13

It easier to cool off on a dry day vs. a humid day because the rate of evaporation is ________.

Accepted Answer

On a dry day, there is less moisture in the air, which allows for more evaporation of sweat from the skin. This evaporation process requires heat energy, so as sweat evaporates, it takes heat energy with it, resulting in a cooling effect on the body. Therefore, the rate of evaporation is greater on a dry day, and more heat is lost.

Question 14

Condensation is ________.

Accepted Answer

The answer of Condensation is ________.
...

Question 15

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

Accepted Answer

According to the diagram, at the same temperature and pressure, the solid phase of xenon has a higher density than the liquid phase. Therefore, solid xenon is more dense than liquid xenon.

Question 16

Why does condensation have a tendency to raise the temperature of a liquid?

Accepted Answer

The answer of Why does condensation have a tendency to...

Question 17

What happens to the temperature of something while it is boiling?

Accepted Answer

During boiling, the temperature of the substance remains constant until all the liquid has turned into vapor. This is because the energy supplied to the substance is used to change the state of the substance instead of increasing its temperature.

Question 18

Evaporation is ________.

Accepted Answer

The answer of Evaporation is ________.
...

Question 19

Why do water drops bead on a freshly waxed surface?

Accepted Answer

The answer of Why do water drops bead on a...

Question 20

Boiling is when the ________.

Accepted Answer

Boiling is the process in which a liquid turns into vapor when its vapor pressure equals the atmospheric pressure. The other options do not accurately describe boiling.

Quiz 8: How Water Behaves