Unit 3A - Summative Exam #3A

Front

What is the total number of atoms in a molecule of CO2?

Back

There are 3 atoms in a molecule of CO2 (1 carbon atom and 2 oxygen atoms).

Front

What does the coefficient in a chemical formula represent?

Back

The coefficient represents the number of molecules of a substance in a chemical reaction.

Front

Which gas is always a reactant in a combustion reaction?

Back

Oxygen (O2) is always a reactant in a combustion reaction.

Front

What is the name of the covalent compound CO?

Back

The name of the covalent compound CO is Carbon monoxide.

Front

What is the chemical formula for Dinitrogen monoxide?

Back

The chemical formula for Dinitrogen monoxide is N2O.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What is the difference between a covalent bond and an ionic bond?

Back

A covalent bond involves the sharing of electron pairs between atoms, while an ionic bond involves the transfer of electrons from one atom to another.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.

Front

What is the general formula for combustion reactions?

Back

The general formula for combustion reactions is: Hydrocarbon + O2 → CO2 + H2O.