This document defines and provides examples of key chemical concepts: filtration separates materials by particle size or solubility, distillation separates substances in a solution based on boiling points, evaporation isolates solids dissolved in liquids, solubility is how much solute dissolves in solvent, flammability is a substance's ability to burn in oxygen, reactivity is how readily a substance combines chemically with others. Examples given are a candle burning and copper reacting with oxygen to form copper oxide.

2. Filtration
A process that separates materials based on the size
of particles +/or solubility.

3. Distillation
A process that separates the substances in a solution based
on their boiling points.

4. Evaporation
A process used to isolate a solid dissolved in liquid.

6. solubility
 How much of a solute can dissolve in a solvent.

7. Flammability
 The ability of a substance to burn in the presence of
oxygen
 A candle wick can burn in the presence of oxygen

8. Reactivity
 How readily a substance chemically combines with
another substance.
 Ex: copper + oxygen = copper oxide

9. Questions for 2.3 review

10. When is the only time chemical
changes can be observed?

11. Composition of
matter
Does not change Does change
during during
Physical change ????????
melting ????????? ????????? rusting

12. What is the difference
between a alloy, colloide,
mixture, and a pure
substance?

13. What is the difference
between a physical change
and a chemical change?

14. What is an example of a
physical change?

15. What is an example of a
chemical change?