1. Key terms REVIEW

2. IN YOUR GROUPS, SEE HOW MANY TERMS YOU CAN DEFINE… MatterChemistrySubstancePhysical property Chemical propertyElementAtom Chemical bond MoleculeCompoundChemical FormulaMixture HeterogeneousHomogeneousWeight Mass VolumeDensity Physical change Chemical change Law of Conservation of MassTemperature Thermal energyEndothermicExothermic Chemical energyPotential energyKinetic energy

3. MATTER Anything that has mass and takes up space…all of the stuff…it’s all matter

4. CHEMISTRY The study of matter and how matter changes

5. SUBSTANCE A single kind of matter that is pure…always has a specific composition

6. PHYSICAL PROPERTY A characteristic of a substance that can be observed without changing it into another substance

7. CHEMICAL PROPERTY A characteristic of a substance that describes its ability to change into difference substances

8. ELEMENT A substance that cannot be broken down into any other substances by chemical or physical means

9. ATOM The basic particle from which all elements are made

10. CHEMICAL BOND A force of attraction between two or more atoms

11. MOLECULE A group of two or more atoms held together by chemical bonds

12. COMPOUND A substance made of two or more elements that are chemically combined in a set ratio

13. CHEMICAL FORMULA Symbol representation showing the elements in compound and the ratio of atoms

14. MIXTURE Two or more substance that are together in the same place, but the atoms are not chemically bonded

15. HETEROGENEOUS Mixture where you can usually see the different parts and they are easily separated out

16. HOMOGENEOUS Mixture where the substances are evenly mixed so it is difficult to see the different parts

17. WEIGHT A measure of the force of gravity

18. MASS The amount of matter in an object

19. VOLUME The amount of space matter occupies

20. DENSITY A measure of the mass of a material in a given substance…how tightly packed matter is in an object

21. PHYSICAL CHANGE An alteration of the form or appearance of matter but does not turn any substance in the matter into a different substance

22. CHEMICAL CHANGE (REACTION) A change in matter that produces one or more new substances

23. LAW OF CONSERVATION OF MASS Matter cannot be created nor destroyed in any chemical or physical change

24. TEMPERATURE A measure of how hot or cold something is

25. THERMAL ENERGY The total energy of the motion of all of the particles in an object

26. ENDOTHERMIC A change in which energy is absorbed (gets cold )

27. EXOTHERMIC A change in which energy is released (gets hot)

28. CHEMICAL ENERGY The energy stored in the chemical bonds between atoms

29. POTENTIAL ENERGY Energy that is stored

30. KINETIC ENERGY Energy of motion and movement