1. Ch. 20

2.  A characteristic that you can observe without changing or trying to change the composition of the substances.

3.  How something looks, smells, or tastes are all examples of physical properties.

4.  You can detect many physical properties with your senses.

5.  Mass is a measurement of how much matter an object contains.

6.  Weight is a measurement of force.  Weight depends on the mass of the object and on gravity.  No matter where you are in the universe your mass never changes, but your weight can.

7.  Density measures the amount of mass in a given volume.  Density= mass/volume  D=m/v

8.  Solubility is the ability of one substance to dissolve into another substance.

9.  The temperature at which a solid changes into a liquid is its melting point.

10.  The temperature at which a liquid changes into a gas is called its boiling point.

11.  Magnetism is a physical property.

12.  A chemical property is a characteristic that cannot be observed without altering the substance.

13.  Examples of chemical properties: Flammability, rusting, reacting with other substances.

14.  A physical change in one in which the form or appearance of matter changes, but not its composition.

15.  Vaporization is the process by which matter from a liquid to a gas.

16.  Condensation is the process where a gas changes into a liquid.

17.  Sublimation is the process in which a solid changes directly into a gas EX: dry ice

18.  Deposition is the process in which a gas changes into a solid.

19.  Chemical Changes occur when substances are changed into different substances.

20.  Color change is an example of a chemical change.

21.  Another sign of a chemical change is the release or gain of energy by an object.

22.  The change in odor is a clue to a chemical change.

23.  The production of bubbles is a sign that a chemical change has taken place.

24.  Another clue to chemical change is the formation of a solid.

25.  The substances produced during a chemical change cannot be changed back into the original substances by physical means.

26.  During a physical change the composition of the substance does not change, but during a chemical change the composition of the substance does change.

27.  Law of conservation of mass states that mass is neither created nor destroyed. As a result the mass of the substances before a physical or chemical change is equal to the mass of the substances present after the change.

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