7th Grade MEGA Review - Units 1-3

Front

What kind of weather does a High Pressure system bring?

Back

Fair and sunny.

Front

What property does helium have if a match held above it goes out?

Back

Helium is less dense than air.

Front

Is the melting of ice an example of a physical or chemical change?

Back

Physical change.

Front

What type of property is sour taste?

Back

Chemical property.

Front

Are atoms and molecules in motion in solids, liquids, and gases?

Back

True.

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the definition of a chemical property?

Back

A characteristic of a substance that can only be observed during a chemical reaction.

Front

What happens to the density of a substance when it is heated?

Back

It generally decreases.

Front

What is the main difference between solids, liquids, and gases in terms of particle movement?

Back

In solids, particles vibrate in place; in liquids, they move more freely; in gases, they move rapidly and are far apart.

Front

What is an example of a chemical change?

Back

Burning wood.