1. Scientific Method Collect Facts and Data Hypothesis Test hypothesis Modify hypothesis Conclusion

2. Hypothesis Tentative explanation of the relationship between two or more variables that provide a basis for further experimentation

3. Theory Well established hypothesis…explains general phenomena…backed by facts…explain natural phenomena…accepted by scientific community until disproven or amended

4. Scientific laws Simple statement of natural phenomena to which no exceptions are known under the given condition.

5. Matter Anything that has mass and takes up space

6. Substance Matter with a definite fixed composition: pure substance. Substances are categorized as elements or compounds.

7. Elements Individual elements from the periodic table Carbon Oxygen Nitrogen Etc…

8. Compounds Two or more elements Water Sodium chloride Potassium carbonate

9. Mixture Material containing two or more substances Heterogenous or homogeneous Composition varies

10. Homogenous A solution A mixture that is the same form and composition throughout

11. Heterogenous A mixture of two or more different substances

12. Solution Homogeneous mixture Different from a pure substance A mixture has two or more substances