What is heat?

Ana places a cooler metal spoon in hot soup. In what direction does energy initially transfer between them?

What quantity does a thermometer measure?

Read the instrument shown. What is the water's temperature?

Water becomes warmer without boiling. How does the average speed of its particles change?

Liquid candle wax cools until it becomes hard. How does its particle arrangement change?

What state of matter keeps its own shape when moved from one container to another?

In the particle model, which box represents water that can be poured but does not fill the entire container?

How are air particles arranged inside an inflated raft?

The particles shown are in a solid. How does their motion change when the solid is warmed but does not melt?

An ice cube gains energy and becomes a puddle of water. What is this process called?

What process occurs when flowing candle wax cools and hardens?

Water in a shallow dish gradually enters the air from its surface without boiling. What process is occurring?

Water vapor touches a cooler pot lid and forms drops. What process occurs?

What process changes a solid directly into a gas without passing through the liquid state?

After prolonged boiling in an uncovered pot, why is there less water left?

Ice becomes water inside a sealed bag that does not leak. What happens to the total mass of the bag and its contents?

An adult heats ice until it becomes water, then continues until it boils. What sequence of states occurs?

What does a substance's freezing point tell us?

Candle wax is heated until it flows, then cooled until it hardens. Has the change of state produced a new substance?