Unit 4: Chemical Reactions

- A substance that changes its properties, or that changes into a different substance, can be represented by chemical equations.
- When a substance changes into a new substance, or when its properties change, no mass is lost or gained.
- A substance can chance into another substance through different processes, and the change itself can be classified by the sort of processes that produced it.

- Describe the components of and quantitative information from models and representations that illustrate both particulate-level and macroscopic-level properties.
- Formulate a hypothesis or predict the results of an experiment.
- Explain the relationship between variables within an equation when one variable changes.
- Determine a balanced chemical equation for a given chemical phenomena.
- Support a claim with evidence from experimental data.

Score a 3 or higher on the unit 4 progress check using the AP score scale:

72-100% = 5

58-71% = 4

42-57% = 3

27-41% = 2

0-26% = 1