Chapter 5 Test
Friday, January 22nd

Lesson 1: Observing Chemical Change
- Changes in matter can be described in terms of physical changes and chemical changes.
- Chemical reactions involve changes in properties and changes in energy that you can often observe.

Vocabulary
physical change, chemical change, reactant, product, precipitate, exothermic reaction, endothermic reaction.

Lesson 2: Describing Chemical Reactions
- A chemical equation tells you the substances you start with in a reaction and the substances that are formed at the end.
- In a chemical reaction, all of the atoms present at the start of the reaction are present at the end of the reaction.
- Three types of chemical reactions are synthesis, decomposition, and replacement.

Vocabulary
chemical equation, law of conservation of mass, open system, closed system, coefficient, synthesis, decomposition, replacement.

Lesson 3: Controlling Chemical Reactions
- All chemical reactions need a certain amount of activation energy to get started.
- Factors that can affect rates of reactions include surface area, temperature, concentration, and the presence of catalysts and inhibitors.

Vocabulary
activation energy, concentration, catalyst, enzyme, and inhibitor.