POGIL: How Does Temperature Change...Pure Water? (7th)

Ava, Luna, and James were conducting a science experiment. They noticed that when they left a glass of water in the sun, some of the water disappeared. Which of the following best describes this phenomenon?

• The water turned from a solid to a liquid

• The water turned from a liquid to a gas

• The water turned from a liquid to a solid

• The water turned from a gas to a liquid

Answer explanation

A puddle of water may dry up.

Evaporation is the change from a liquid to a gas or vapor.

Tags

NGSS.MS-PS1-4

Mason, Grace, and Mia were conducting a science experiment. They noticed a change in state from gas to liquid. What is this process called?

• boiling

• freezing

• melting

• condensation

Answer explanation

Water droplet may form on a cold soda can.

Condensation is the change from a gas to a liquid.

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NGSS.MS-PS1-4

Which of the following shows freezing?

• solid → liquid

• liquid → gas

• liquid → solid

• gas → liquid

Answer explanation

Water freezes into ice.

Freezing is the change from a liquid to a solid.

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NGSS.MS-PS1-4

Which of the following shows melting?

• solid → liquid

• liquid → gas

• liquid → solid

• gas → liquid

Answer explanation

When ice melts, a puddle of water may form.

Melting is the change from a solid to a liquid.

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NGSS.MS-PS1-4

Heat energy is absorbed by a substance during

• vaporization

• condensation

• freezing

• deposition

Answer explanation

What can happen if a liquid gets hot enough?

Heat energy is absorbed during vaporization as a substance changes from liquid to gas. Heat energy is also absorbed during melting and sublimation.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

The graph shows the changes in the temperature of a substance as it absorbs heat at a constant rate. During which intervals on the graph is the temperature of the molecules in the sample increasing?

Answer explanation

The temperature of a substance is a measure of the average kinetic energy of its molecules. The graph shows how the temperature of the substance changes while heat is added, as a function of time. Flat areas of the graph indicate intervals when the temperature remains constant. The segments AB, CD, and EF show a rise in temperature.

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NGSS.MS-PS1-4

The graph shows the relationship between the temperature of 1 kilogram of a pure substance and the heat energy added to the substance. The freezing point of the substance is (a)  

• 400°C
• 300°C
• 200°C
• 100°C

Answer explanation

The freezing point of a substance is the temperature where the solid and liquid phases exist together.

According to the graph, the substance is a solid at temperatures below 200°C, and a liquid at temperatures above 200°C. That means 200°C must be its freezing point.

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NGSS.MS-PS1-4

The graph shows the constant cooling of a substance. The substance starts as a gas above its boiling point. BC shows when both the gas and liquid phases are present. Which segment of the curve represents a time when both the liquid and the solid phases are present?

Answer explanation

The flat areas represent phase changes.

The flat areas of the graph are where phase changes take place. Segment DE represents the time in which the liquid is changing to a solid. Both phases are present.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Lily, Abigail, and Zoe were studying the heating curve of water in their science class. They noticed a particular point on the curve where the temperature remained constant despite the heat being applied. They realized this was the freezing point of water. Can you tell what the freezing point of water is?

• 1°C

• 12°C

• 60°C

• 100°C

Answer explanation

Which region of the graph represents the part where solid and liquid exist together?

The flat part of the graph between time t1 and time t2 represents the interval in which substance is melting; the solid and liquid phases exist together. The temperature throughout this interval is 12°C. That is the freezing point of the substance

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NGSS.MS-PS1-4

The diagram shows the cooling curve for a substance. The time, in minutes, required to cool the substance from point B to a liquid at its freezing point is

• 2.5

• 10.0

• 12.5

• 15.0

Answer explanation

The freezing point is at D, and the boiling point is at B.

Point B (Boiling point) is at time = 2.5 minutes. The liquid reaches its freezing point at point D at time 15 minutes. The difference is 12.5 minutes.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4