 The study of the composition, structure, and properties of matter and the changes it undergoes

 Analytical Chemistry Study that focuses on the composition of matter  Physical Chemistry Study that focuses on the changes in matter – the rate of change, energy transfer

 Organic Chemistry Study of all chemicals containing carbon  Mainly organisms  Inorganic Chemistry Study of chemicals that do not contain carbon  Mainly nonliving objects  Biochemistry Study of the processes that take place in organisms  Muscle contraction, digestion

An organized set of investigation procedures

1. State the problem The “how” or “why” 2. Gather information 3. Form a hypothesis A possible explanation for a problem using what you know and what you observe A suggested explanation for an observation

4. Test the hypothesis by performing an experiment 5. Analyze data Record observations Organize data into tables and graphs

6. Draw conclusions If your data supports the hypothesis, your hypothesis was correct. If your data does not support the hypothesis, your hypothesis was not correct. Change your hypothesis and begin again.

 Tests the effect of one by using controlled conditions  Uses variables or a quantity that can have more than a single value

 Independent: the variable you can change or manipulate to see how it affects the dependent variable  Dependent: the variable that changes because of the independent variable

 Constant: a factor that does not change when other variables change  Control: standard by which the test results can be compared