Chemical Reactions and Balancing Equations Quiz

What is the main purpose of a chemical equation?

• To indicate the temperature of a reaction

• To represent the substances before and after a reaction

• To show the physical state of substances

• To display the color of reactants and products

What is the first step in balancing a chemical equation?

• Convert words into formulas

• Write the words of the reactant and product substances

• Pick an atom type that isn't balanced

• Change a coefficient to fix the imbalance

In the reaction between hydrogen and oxygen, what is the balanced equation for water formation?

• H2 + O2 -> H2O

• 2H2 + O2 -> 2H2O

• H2 + 2O2 -> 2H2O

• 2H2 + 2O2 -> 2H2O

What is the valency of carbon in the reaction with oxygen to form carbon dioxide?

• Four

• Two

• One

• Three

In the reaction between carbon and oxygen, why is no coefficient change needed?

• Because the reaction is endothermic

• Because oxygen is more reactive

• Because carbon has a higher valency

• Because carbon and oxygen are already balanced

What is the formula for methane?

• CH3

• CH4

• C2H4

• C2H6

In the combustion of methane, which atom type should be balanced last?

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

What are the products of a hydrocarbon combustion reaction?

• Carbon monoxide and hydrogen

• Carbon dioxide and hydrogen

• Carbon dioxide and water

• Carbon monoxide and water

What is the formula for propane?

• C3H6

• C3H8

• C4H8

• C4H10

What is another name for propane when used as a fuel?

• Natural Gas

• Kerosene

• LPG

• Butane