Heat flow and temperature

How is temperature related to heat?

• Temperature is a measure of the heat of an object.

• Heat causes a change in the temperature of an object.

• Raising the temperature causes the heat of an object to increase.

• Temperature and heat are two different ways to measure the same thing.

Emerson places a beaker of water on a hotplate and turns the hotplate on. The temperature in the room is 25 ºC. After the water heats to 75 ºC, she adds pieces of ice to the beaker.

Which of the following describes a transfer of heat energy that occurs during this experiment?

• from the air to the water

• from the ice to the beaker

• from the water to the ice

• from the water to the hotplate

Jeriah places two metal cubes in contact with each other. Energy transfers as heat flows from Cube A to Cube B. What conclusion can you draw regarding Cube A?

• It is larger than Cube B.

• It is cooler than Cube B.

• It is smaller than Cube B.

• It is warmer than Cube B.

Which description defines heat?

• total thermal energy of an object or substance

• change in the temperature of a substance in degrees Celsius

• energy transferred between objects at different temperatures

• average kinetic energy of the particles that make up a substance

Which of these processes is the result of the motion of particles in a gas or liquid?

• conduction

• convection

• insulation

• radiation

Emily has a cup of hot cocoa on the counter to cool off so she can drink it safely. She watches the steam rise from the hot cocoa. Which type of thermal energy transfer is occurring as the steam rises into the surrounding air?

• conduction

• convection

• radiation

• transformation

A toaster warms a bagel for breakfast. What type of thermal energy transfer is occuring?

• conduction

• convection

• radiation

• transformation

At room temperature water is a liquid. How could the water be changed to a solid?

• add heat

• remove heat

• decrease density

• increase density

Using the picture. What was the change in the system?

• air was added to the system

• heat was added to the system

• water was added to the system

• particles were added to the system

On a hot day the lake water warms and the temperature increases. How does the movement of the particles change?

• move slower and farther apart

• move slower and closer together

• move faster and farther apart

• move faster and closer together