Chemical Equations Quiz

What is the Law of Conservation of Mass?

• Mass is created in chemical reactions

• Mass is destroyed in chemical reactions

• Mass is neither created nor destroyed in chemical reactions

• Mass is doubled in chemical reactions

What is the purpose of balancing a chemical equation?

• To have different numbers of atoms on both sides of the equation

• To have the same number of atoms on both sides of the equation

• To destroy atoms

• To create more atoms

What is the least common multiple of 3 and 2?

• 7

• 6

• 5

• 4

What type of reaction is represented by the equation A + B → AB?

• Synthesis (Combination) Reaction

• Decomposition Reaction

• Single Replacement Reaction

• Combustion Reaction

What is the main characteristic of a combustion reaction?

• Color change

• Precipitation (Solids falling out of liquid)

• Formation of Bubbles (Gas)

• Temperature change

What is the product of the reaction: Fuel + O2 → CO2 + H2O?

• Hydrogen Peroxide

• Water Vapor

• Carbon Dioxide

• Carbon Monoxide

What is the purpose of using coefficients in front of each formula in balancing a chemical equation?

• To have different numbers of atoms on each side

• To balance the number of atoms on each side

• To destroy atoms

• To create more atoms

What is the first step to balancing a chemical equation?

• Counting the atoms on each side of the equation

• Multiplying the coefficient of each element by the subscript of the element

• Writing all reactants on the right side

• Adding coefficients to each formula

What is the reactant of the reaction: AB + CD → AD + CB?

• AD

• CB

• AB

• CD