5. Differences Between Mass and Weight Mass is... a measure of the amount of matter in an object. always constant for an object no matter where the object is in the universe. measured with a balance expressed in kilograms (kg), grams (g), and milligrams (mg).

6. Differences Between Mass and Weight Weight is... a measure of the gravitational force on an object. varied depending on where the object is in relation to the Earth (or any other large body in the universe). measured with a spring scale. expressed in newtons (N).

7. Particle View of Solids, Liquids, and Gases

8. Solid Particles of a solid do not move fast enough to overcome the strong attraction between them, so they are held tightly in place. The particles vibrate in place.

9. Liquid

10. Liquid Particles of a liquid move fast enough to overcome some of the attraction between them. The particles are able to slide past one another.

11. Gas

12. Gas Particles of a gas move fast enough to overcome nearly all of the attraction between them. The particles move independently of one another.

13. Gas Pressure Gas particles exert pressure by hitting the walls of a balloon

14. Gas Pressure The balloon pops because the internal pressure is more than the balloon can hold

15. Boyle’s Law Higher Pressure

16. Boyle’s Law Higher Pressure Highest Pressure

17. Relationship Between Pressure and Temperature

18. Charles’s Law

20. Graphs of Charles’s Law and Boyle’s Law

21. Evaporation and Boiling

22. Exploring Changes of State

23. The Water Cycle

25. Examples of Chemical Changes Soured milk smells bad because bacteria have formed new substances in the milk. The hot gas formed when hydrogen and oxygen join to make water helps blast the space shuttle into orbit. Effervescent tablets bubble when the citric acid and baking soda in them react in water. The Statue of Liberty is made of shiny, orange-brown copper. But the metal’s interaction with carbon dioxide and water has formed a new substance, copper carbonate, and made this landmark lady green over time.