8.1 Reactions and Equations

In the context of chemical reactions, what does the flame in Figure 1 represent?

• A chemical product

• A chemical reactant

• A chemical reaction

• A chemical equation

What do chemical reactions involve?

• Rearranging atoms to form different substances

• Creating new atoms

• Destroying atoms

• None of the above.

Chemical reactions are represented using _________.

• Mathematical equations

• Chemical equations

• Physical diagrams

• Biological models

What is a chemical reaction?

• A process that involves rearrangement of the molecular or ionic structure of a substance

• A mathematical equation

• A type of physical change

• A biological process.

Fill in the blank: A chemical equation is a symbolic representation of a ________.

• A) physical change

• B) chemical reaction

• C) biological process

• D) mathematical formula

What is a reactant in a chemical reaction?

• A substance that is consumed during the reaction

• A substance that is produced by the reaction

• A catalyst

• A byproduct.

Fill in the blank: In a chemical reaction, the substances formed as a result of the reaction are called ________.

• A) reactants

• B) products

• C) coefficients

• D) catalysts

What is a coefficient in a chemical equation?

• A number that appears in front of a formula

• A type of reactant

• A product of the reaction

• A catalyst.

What is a chemical change?

• A process in which substances are rearranged to form different substances.

• A process in which one or more substances change into one or more different substances.

• A process that does not involve any change in substances.

• A process that only involves physical changes.

A chemical reaction is a process in which the atoms of one or more substances are _______ to form different substances.

• destroyed

• rearranged

• created

• unchanged