Counting Atoms

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

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

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

How many atoms are in a molecule of water (H₂O)?

Back

There are 3 atoms in a molecule of water: 2 hydrogen (H) and 1 oxygen (O).

Front

What is the chemical formula for magnesium hydroxide?

Back

The chemical formula for magnesium hydroxide is Mg(OH)₂.

Front

How many magnesium (Mg) atoms are in 4 Mg(OH)₂?

Back

There are 4 magnesium (Mg) atoms in 4 Mg(OH)₂.

Front

How many chlorine (Cl) atoms are in MgCl₂?

Back

There are 2 chlorine (Cl) atoms in MgCl₂.

Front

What is the chemical formula for ammonium chromate?

Back

The chemical formula for ammonium chromate is (NH₄)₂CrO₄.

Front

How many nitrogen (N) atoms are in (NH₄)₂CrO₄?

Back

There are 2 nitrogen (N) atoms in (NH₄)₂CrO₄.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.