Understanding Heat Energy Graphs

What are the two main functions of heat energy?

• To change the color of water and to freeze it

• To cause a change in state and to alter the temperature

• To increase the volume and to decrease the mass

• To create light and to produce sound

Which part of the heat energy graph indicates an increase in temperature?

• The upward slope

• The first straight line

• The second straight line

• The downward slope

During which part of the heat energy graph does a change of state occur?

• During the first straight line

• During the upward slope

• During the downward slope

• During the second straight line

At what temperature does water exist as both liquid and gas on the graph?

• 100 degrees Celsius

• 50 degrees Celsius

• 150 degrees Celsius

• 0 degrees Celsius

What is a common misconception about the heat energy graph?

• That heat energy is not gained during a straight line

• That water cannot exist in two states simultaneously

• That room temperature is not considered

• That temperature increases during a change of state