Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products), involving the breaking and forming of chemical bonds.

Front

What evidence indicates a chemical reaction has occurred?

Back

The formation of a new substance, such as a gas, solid, or color change.

Front

What are reactants in a chemical equation?

Back

The starting substances that undergo a chemical change, found on the left side of the equation.

Front

What are products in a chemical equation?

Back

The substances formed as a result of a chemical reaction, found on the right side of the equation.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What happens to bonds during a chemical reaction?

Back

Existing bonds break and new bonds form, rearranging atoms to create new substances.

Front

What is an example of a physical change?

Back

Crushing a compound into a fine powder, which does not change its chemical identity.

Front

What is an example of a chemical change?

Back

Burning coal, which produces carbon dioxide and other substances.

Front

What is a catalyst?

Back

A substance that speeds up a chemical reaction without being consumed in the process.

Front

What is an exothermic reaction?

Back

A chemical reaction that releases energy, usually in the form of heat.