Phase Changes

Question 1

Consider the temperature versus time graph below.In which region is the substance in both the solid phase and the liquid phase?

Revolt · Accepted Answer

2

Question 2

The diagram below shows the different phase transitions that occur in matter.Which statement best describes the process that arrow 1 represents?

Revolt · Accepted Answer

Molecules are speeding up as boiling occurs.

Question 3

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

Revolt · Accepted Answer

at 120°C

Question 4

Which example involves a phase change in which heat energy is released by the substance?

Revolt · Accepted Answer

freezing ice cream

Question 5

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

Revolt · Accepted Answer

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

Question 6

Which best explains the relationship between evaporation and temperature?

Revolt · Accepted Answer

A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.

Question 7

The diagrams below represent the four states of matter. Diagram 1 Diagram 2 Diagram 3 Diagram 4Which diagram represents the phase that occurs after a solid melts?

Revolt · Accepted Answer

diagram 1

Question 8

A solid substance turns directly into a gas. Which term describes this change?

Revolt · Accepted Answer

sublimation

Question 9

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

Revolt · Accepted Answer

sublimation

Question 10

The arrows in the chart below represent phase transitions.Which arrows represent the phase transitions in which heat energy is gained?

Revolt · Accepted Answer

1, 2, and 3

Phase Changes Answers

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