Chemistry Unit test

Front

What is the best way to get salt out of a salt-water solution?

Back

Boil away the water.

Front

How are protons and neutrons different?

Back

Protons have a positive charge, while neutrons have no charge.

Front

What is the mode in a list of numbers?

Back

The number that appears the most in a list of numbers.

Front

What best describes an ionic bond?

Back

A bond formed by the transfer of electrons from one atom to another.

Front

How is matter conserved in a chemical reaction?

Back

There are three oxygen atoms in the reactants for every three oxygen atoms in the products.

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into different substances (products).

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is an element?

Back

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

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 of a substance without changing its identity, while a chemical change results in the formation of new substances.