1. MatterSection 2 2-2-1 Physical Properties 〉 Physical properties are characteristics that can be observed without changing the identity of the substance.

2. MatterSection 2 2-2-2 Physical Properties, continued Physical properties can help identify substances.

3. MatterSection 2 2-2-3 Physical Properties, continued Physical properties can be observed or measured.

4. MatterSection 2 2-2-4 Physical Properties, continued –Examples: shape, color, odor, texture, state, melting point, boiling point, strength, hardness, magnetism, the ability to conduct electricity or heat

5. MatterSection 2 2-2-5 Physical Properties, continued –melting point: the temperature and pressure at which a solid becomes a liquid

6. MatterSection 2 2-2-6 Physical Properties, continued –boiling point: the temperature and pressure at which a liquid becomes a gas

7. MatterSection 2 2-2-7 Physical Properties, continued Physical properties help determine uses.

8. MatterSection 2 2-2-8 Physical Properties, continued Density is a physical property.

9. MatterSection 2 2-2-9 Physical Properties, continued –density: the ratio of the mass of a substance to the volume of the substance

10. MatterSection 2 2-2-10 Physical Properties, continued

11. MatterSection 2 2-2-11 Physical Properties, continued –common unit of density is g/cm 3

12. MatterSection 2 2-2-12 Physical Properties, continued Density is different from weight.

13. MatterSection 2 2-2-13 Math Skills Density If 10.0 cm 3 of ice has a mass of 9.17 g, what is the density of ice?

14. MatterSection 2 2-2-14 Math Skills 1. List the given and unknown values. Given: mass, m = 9.17 g volume, V = 10.0 cm 3 Unknown: density, D = ? g/cm 3

15. MatterSection 2 2-2-15 Math Skills, continued 2. Write the equation for density. density = mass/volume, or D = m/V

16. MatterSection 2 2-2-16 Math Skills, continued 3. Insert the known values into the equation, and solve.

17. MatterSection 2 Chemical Properties 〉 Why are flammability and reactivity classified as chemical properties?

18. MatterSection 2 2-2-17 Chemical Properties A chemical property describes how a substance changes into a new substance, either by combining with other elements or by breaking apart into new substances.

19. MatterSection 2 2-2-18 Chemical Properties, continued Flammability is a chemical property. –flammability: the ability to burn

20. MatterSection 2 2-2-19 Chemical Properties, continued Reactivity is a chemical property.

21. MatterSection 2 2-2-20 Chemical Properties, continued –reactivity: the capacity of a substance to combine chemically with another substance

22. MatterSection 2 2-2-21 Chemical Properties, continued Physical and chemical properties are different.

23. MatterSection 2 2-2-22 Chemical Properties, continued Physical properties can be observed without changing the identity of a substance.

24. MatterSection 2 2-2-23 Chemical Properties, continued Chemical properties can be observed only in situations in which the identity of the substance changes.

25. MatterSection 2 2-2-1 Review Questions Define physical properties.

26. MatterSection 2 2-2-2 Review Questions What can physical properties be used for?

27. MatterSection 2 2-2-3 Review Questions List 12 examples of physical properties.

28. MatterSection 2 2-2-4 Review Questions Define melting point.

29. MatterSection 2 2-2-5 Review Questions Define boiling point.

30. MatterSection 2 2-2-6 Review Questions What do physical properties help determine?

31. MatterSection 2 2-2-7 Review Questions What kind of property is density?

32. MatterSection 2 2-2-8 Review Questions Define density.

33. MatterSection 2 2-2-9 Review Questions What is the formula for density?

34. MatterSection 2 2-2-10 Review Questions What is the common unit for density?

35. MatterSection 2 2-2-11 Review Questions Density and weight are the same. True or False

36. MatterSection 2 2-2-12 Review Questions What is the density of a rock that has a mass of 40.0 g and a volume of 10.0 cm 3.?

37. MatterSection 2 2-2-13 Review Questions What does a chemical property describe?

38. MatterSection 2 2-2-14 Review Questions List 2 chemical properties.

39. MatterSection 2 2-2-15 Review Questions Define flamability.

40. MatterSection 2 2-2-16 Review Questions Define reactivity.

41. MatterSection 2 2-2-17 Review Questions Chemical and physical properties are different. True or False

42. MatterSection 2 2-2-18 Review Questions What happens to the identity of a substance when physical properties are observed?

43. MatterSection 2 2-2-19 Review Questions What happens to the identity of a substance when chemical properties are observed?

44. MatterSection 2 2-2-20 Review Questions What happens to the identity of a substance when chemical properties are observed?