Physical Science Review

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties, often involving a reaction that produces gas, heat, or light.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as changes in state, shape, or size.

Front

What are the states of matter?

Back

The states of matter are solid, liquid, and gas, characterized by the arrangement and motion of particles.

Front

How does particle motion vary among the states of matter?

Back

In solids, particles are closely packed and vibrate in place; in liquids, particles are close but can move past each other; in gases, particles are far apart and move freely.

Front

What is evaporation?

Back

Evaporation is the process by which liquid turns into vapor, usually occurring at the surface of the liquid.

Front

What is a solution?

Back

A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent), such as saltwater.

Front

What is the law of conservation of energy?

Back

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

What happens to energy during combustion?

Back

During combustion, chemical energy in a substance (like wood) is converted into heat and light energy.

Front

What is refraction?

Back

Refraction is the bending of a wave, such as light, as it passes from one medium to another due to a change in speed.

Front

Why does light bend when entering water from air?

Back

Light bends when entering water from air because its speed decreases in water, causing the wave to change direction.