7th Grade Science Review

Front

What is an element?

Back

A substance that cannot be broken down into simpler substances by chemical means.

Front

Provide an example of a compound.

Back

Water.

Front

Define physical change.

Back

A physical change is a change in which the substance's physical properties, such as shape, size, or state of matter, are altered, but its chemical composition remains the same.

Front

Give an example of an element.

Back

Oxygen.

Front

What is a chemical change?

Back

A chemical change is a process that results in the formation of new substances with different properties from the original substances.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together.

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 the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.