Science Unit Test Part 1 Review

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. Examples include changes in state, shape, or size.

Front

Give an example of a physical change.

Back

Ice melting is an example of a physical change.

Front

What are the three common states of matter?

Back

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

Front

What is a molecule?

Back

A molecule is a particle made of two or more atoms bonded together.

Front

Which substance has the most dense arrangement of particles?

Back

Steel has the most dense arrangement of particles compared to helium gas, olive oil, and milk.

Front

What happens to the particles in a solid?

Back

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

Front

What happens to the particles in a liquid?

Back

In a liquid, particles are close together but can move past one another, allowing liquids to take the shape of their container.

Front

What happens to the particles in a gas?

Back

In a gas, particles are far apart and move freely, filling the entire volume of their container.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an example of a chemical change?

Back

Rusting of iron is an example of a chemical change.