Phase Changes

o degress C

At what temperature does the solid start melting?

5

The diagram below shows the different phase transitions that occur in matter. Which arrow would most likely represent the phase change that occurs when silver is poured into a mold and cools to become a solid bar?

evaporating

Jean has a sample of a liquid. If she changes the liquid's phase by ___________________ it, the molecules will spread out, allowing the sample to expand and fill a container of any shape or volume.

during sublimation

When does carbon dioxide absorb the most heat energy?

Heat energy is absorbed by the substance.

Which energy change occurs during boiling?

freezing ice cream

Which example involves a phase change in which heat energy is released by the substance?freezing ice cream cooking a pot of soup melting ice under sunlight watching frost disappear into air

Molecules are speeding up as boiling occurs.

Which statement best describes the process that arrow 1 represents?

at 120°C

Consider the temperature versus time graph below. At what temperature is the boiling point of this substance? at 0°C

1, 2, and 3

The arrows in the chart below represent phase transitions. Which arrows represent the phase transitions in which heat energy is gained? 1, 2, and 3 2, 3, and 5 3, 4, and 5 4, 5, and 6

A substance that has a specific shape and volume changes to a substance that has a specific volume.

A solid substance turns into a liquid. Which best describes this change?

4

Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1?

Heat energy is released by the substance.

Which best describes the energy change that takes place during deposition?

It is true because heat is released when a gas changes to a liquid.

Consider the statement below. "When nitrogen is liquefied, heat is released." Is this statement true or false?

2

In which region is the substance in both the solid phase and the liquid phase?

from a gas to a liquid

Water is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?

sublimation

In which phase transition do molecules directly move from a state involving vibration of particles in a fixed position to a state involving random movement of high-speed particles?