PHET: Phase Change LAB

Front

What is the definition of phase change?

Back

A phase change is a transition of matter from one state (solid, liquid, gas) to another, typically due to changes in temperature or pressure.

Front

What are the three main states of matter?

Back

The three main states of matter are solid, liquid, and gas.

Front

What happens to the temperature of a substance during a phase change?

Back

The temperature remains constant during a phase change, even though heat is being added or removed.

Front

What is the boiling point of water in degrees Celsius?

Back

The boiling point of water is 100 degrees Celsius.

Front

What is the melting point of ice in degrees Celsius?

Back

The melting point of ice is 0 degrees Celsius.

Front

What is the difference between atoms and molecules?

Back

Atoms are the basic units of matter, while molecules are made up of two or more atoms bonded together.

Front

Give an example of a molecule and its constituent atoms.

Back

Water (H2O) is a molecule made up of two hydrogen (H) atoms and one oxygen (O) atom.

Front

What is the significance of temperature in phase changes?

Back

Temperature determines the energy of particles; higher temperatures generally lead to phase changes from solid to liquid (melting) or liquid to gas (boiling).

Front

What is sublimation?

Back

Sublimation is the phase change from solid directly to gas without passing through the liquid state.

Front

What is condensation?

Back

Condensation is the phase change from gas to liquid, often occurring when gas cools down.