Test 12 Review

Front

What indicates that a chemical reaction has occurred?

Back

Evidence of a chemical reaction includes the formation of a precipitate, a color change, a temperature change, or the production of gas. All of these are indicators.

Front

What are the reactants in a chemical equation?

Back

Reactants are the starting substances in a chemical reaction, found on the left side of the equation.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

Front

How can you tell if a chemical equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation. If they are equal, the equation is balanced.

Front

What is the significance of a gas being formed in a reaction?

Back

The formation of gas is evidence of a chemical change, indicating that new substances are being produced.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What does a color change in a reaction indicate?

Back

A color change often indicates that a chemical reaction has occurred, suggesting that new substances with different properties have formed.

Front

What is the role of temperature change in a chemical reaction?

Back

A temperature change can indicate that a chemical reaction is occurring, as energy is either absorbed or released.

Front

What is the difference between reactants and products?

Back

Reactants are the starting materials in a chemical reaction, while products are the substances formed as a result of the reaction.

Front

What does it mean for a reaction to be exothermic?

Back

An exothermic reaction is one that releases energy, usually in the form of heat, to the surroundings.