Chemistry Unit Test

Front

What is the chemical formula for water?

Back

H₂O

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

How many protons does an element with atomic number 9 have?

Back

9 protons.

Front

What is the total number of atoms in a molecule of alanine (C₃H₇NO₂)?

Back

13 atoms.

Front

What does the Law of Conservation of Mass state?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What does the number 4 represent in the chemical formula 4NH₃?

Back

Coefficient.

Front

What is a coefficient in a chemical equation?

Back

A number that indicates how many molecules of a substance are involved in a reaction.

Front

What is a subscript in a chemical formula?

Back

A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.

Front

What is the difference between a coefficient and a subscript?

Back

A coefficient applies to the entire molecule, while a subscript applies only to the element it follows.

Front

What is the molecular formula for glucose?

Back

C₆H₁₂O₆