AP Chem Chapter 1&2

A systematic approach to research

• Scientific Method

• Hypothesis

• Law

• Theory

A tentative explanation for a set of observations

• Hypothesis

• Scientific Method

• Theory

• Chemistry

A concise statement of a relationship between phenomena that is always the same under the same conditions

• Law

• Hypothesis

• Chemistry

• Mixture

A unifying principle that explains a body of facts and/or those laws that are based on them.

• Theory

• Chemistry

• Matter

• Subsatnce

The study of matter and changes it undergoes

• Chemistry

• Theory

• Hypothesis

• Mixture

Anything that occupies space and has mass

• Matter

• Substance

• Mixture

• Physical Means

A form of matter that has a definite composition and distinct properties

• Substance

• Matter

• Substance

• Compound

A combination of 2 or more substances in which the substance retain their distinct identities

• Mixture

• Substance

• Matter

• Compound

A substance composed of atoms of two or more elements chemically united in fixed proportions

• Compound

• Mixture

• Substance

• Matter

Does not alter the composition or identity of a substance- phase change

• Physical Change

• Chemical Change

• Exstensive Properties

• Mass