The REAL 8th grade science final

Front

What is the statement about the number of elements in periods on the periodic table?

Back

False - Not all periods contain the same number of elements.

Front

Viscosity measures a fluid's __________.

Back

resistance to flow.

Front

How are chemical equations balanced?

Back

By changing the coefficients, not the subscripts.

Front

What happens to volume as the space in a container gets smaller?

Back

Volume decreases.

Front

What is an ion?

Back

An atom that has gained or lost electrons.

Front

What is the definition of an element?

Back

A pure substance that cannot be broken down into simpler substances.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

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

Back

A physical change alters the form of a substance, while a chemical change alters its composition.

Front

What is the pH scale used for?

Back

To measure the acidity or basicity of a solution.

Front

What is the definition of a compound?

Back

A substance formed when two or more elements chemically bond together.