G8- T2L2: Chemical Changes Quiz

What is a change that alters the form or appearance of a substance without changing it into a different substance?

• Physical change

• Chemical change

• Endothermic reaction

• Exothermic reaction

What is a change in matter that produces one or more new substances?

• Physical change

• Chemical change

• Endothermic reaction

• Exothermic reaction

What are substances that undergo chemical changes called?

• Reactant

• Product

• Physical change

• Endothermic reaction

What provides evidence that a chemical reaction has occurred?

• Changes in color

• Gas production

• Formation of a precipitate

• All of the above

In an exothermic reaction, what happens to the energy released to form the products?

• It is equal to the energy required to break the bonds of the reactants

• It is not related to the energy of the reactants

• It is less than the energy required to break the bonds of the reactants

• It is greater than the energy required to break the bonds of the reactants

What is the minimum amount of energy needed to start a chemical reaction called?

• Surface area

• Catalyst

• Energy graph

• Activation energy

What factors may affect rates of reactions?

• All of the above

• Concentration

• Temperature

• Surface area

What is a substance that lowers the activation energy needed to start a reaction called?

• Catalyst

• Inhibitor

• Product

• Reactant

What is another way to increase the rate of a chemical reaction besides temperature and concentration?

• Pressure

• Volume

• Catalyst

• Inhibitor

What is used to decrease the rate of a chemical reaction?

• Inhibitor

• Reactant

• Product

• Catalyst