“Matter States and Phase Change” Flashcard (P2.2)

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

What are the three main states of matter?

Back

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

Front

How does matter change from one state to another?

Back

Matter changes state through the addition and subtraction of thermal energy, also known as heat.

Front

What happens to particles in a solid?

Back

In a solid, particles are closely packed together and vibrate in place.

Front

What happens to particles in a liquid?

Back

In a liquid, particles are close together but can move past one another, allowing liquids to flow.

Front

What happens to particles in a gas?

Back

In a gas, particles are far apart and move freely, filling the entire space available.

Front

What is thermal energy?

Back

Thermal energy, or heat, is the energy that comes from the temperature of matter.

Front

What occurs when thermal energy is added to a substance?

Back

Adding thermal energy causes the particles to move faster, which can lead to a phase change.

Front

What occurs when thermal energy is removed from a substance?

Back

Removing thermal energy causes the particles to move slower, which can also lead to a phase change.

Front

What is a phase change?

Back

A phase change is a transition of matter from one state to another, such as melting, freezing, or boiling.