1. WHAT ARE PHYSICAL AND CHEMICAL PROPERTIES?
Chapter 8
Lesson 2
SPI’s:

2. AT THE END OF THIS LESSON YOU WILL KNOW THE DIFFERENCE BETWEEN:
Physical and Chemical Properties

3. LET’S BREAK THIS DOWN: When the word “properties” is used, what are we really talking about?

4. Properties is a word used to describe matter.
Who remembers what matter is?

5. Recalling Prior Knowledge:
Matter is anything with mass (weight) and takes up space.
So properties describes matter

6. Every object or material you can think of has some form of matter… so every object or material will have physical or chemical properties.

7. Let’s read to find out more about Properties on PP. 296 and 297.

8. Question (Analyze)
What properties of wood and metal make them better materials for a baseball bat than paper or glass? (Remember, properties describe matter…)

9. Answer
Wood and metal are stronger and less breakable than paper or glass.
(Can you imagine a baseball bat made of paper or glass?)
wood and metal = Matter
stronger and less breakable = Properties
glass and paper = Matter

10. Question (Compare and Contrast)
How are the physical properties of paper and aluminum foil alike and different?

11. Answer Compare (Alike) Both are: Thin Flexible Flat
Contrast (Different)
Paper is white and dull
Foil is silver and shiny.

12. Question (Infer)
How do you know that a chemical change takes place when paper burns?

13. Answer
New matter is produced that has a different identity (look or appearance) and different properties from the original paper.

14. Science Journals Vocabulary:

15. VOCABULARY: boiling point chemical property conductivity density melting point solubility

16. VOCABULARY: boiling point – temperature at which a substance changes from a liquid to a gas.

17. VOCABULARY: Chemical property – ability of a material to change its chemical makeup.

18. VOCABULARY: Conductivity – ability to carry energy

19. VOCABULARY: density – mass per unit volume of a substance

20. VOCABULARY: melting point – temperature at which a substance changes from a solid to a liquid

21. VOCABULARY: solubility – measure of how much of one substance can dissolve in another substance

22. Who remembers what you’re supposed to know by the end of this lesson?

23. The difference between…
Physical and Chemical properties!!!
Let’s continue by reading
PP. 298 and 299

24. Compare and Contrast
How are the physical properties of solids and liquids alike and different?

25. Compare and Contrast
Compare: (Alike) Both have definite volume Contrast: (Different) Solids have a definite shape Liquids take on the shape of their container

26. Apply What You’re Learning
What if you have two samples of an unknown substance that have the same color, texture, and density. How could you use temperature changes to find out if they are the same substance or different substances? (Refer back to the selection if necessary)

27. Apply What You’re Learning
Find the samples’ melting and/or boiling points. If the samples have the same melting point and the same boiling point, they are probably the same substance. Ahhh, now you’re catching on…

28. Analyze
A mixture of water and rubbing alcohol is heated. At 82 degrees Celsius, the mixture begins to boil, and some of the liquid turns into gas. The rest of the liquid doesn’t turn to a gas until the temperature is increased to 100 degrees Celsius. What is happening to the mixture as it is heated? Hint: Remember, this is a mixture.

29. Answer
Rubbing alcohol’s boiling point is 82 degrees Celsius, while water’s boiling point is 100 degrees Celsius. When you heat the mixture, it first reaches rubbing alcohol’s boiling point, and the rubbing alcohol begins to turn into a gas. When it reaches water’s boiling point, the water begins to turn into a gas.

30. Let’s Continue Reading
Solubility and Conductivity PP. 300 and 301

31. What new material is formed when wood is burned?
Recall Details
What new material is formed when wood is burned?

32. Answer
Burnt wood turns to ash.

33. Question
A metal bicycle that begins to rust after being left out in the rain has undergone what type of change, physical or chemical? How do you know?

34. Chemical, because the rust is a different kind of matter than metal.
Answer
Chemical, because the rust is a different kind of matter than metal.

35. Question
What type of change is caused by cutting? Physical or chemical? Explain. What kind of change is caused by burning? Physical or chemical? Explain.

36. Answer
Cutting is a physical change because it changes the shape of the material but does not change the kind of material itself. Burning is a chemical change because it changes into a new kind of material.

37. How is a chemical property different than a physical property?
Question
How is a chemical property different than a physical property?

38. Answer
Chemical properties describe a substance’s ability to become a new substance.
For Example:
Water turns to vapor = new substance = chemical change.
Ice turns to liquid = new substance = chemical change.
Cake batter turns to cake = new substance = chemical change.
Jell-O sugar crystals turn to solid Jell-O = new substance = chemical change.

39. Question
Cooking an egg causes new kinds of matter to form. Take a look at the illustration on P Which material in the picture undergoes a chemical change when heated, the egg or the frying pan? Explain.

40. Answer
The egg because it changes from a raw egg to a cooked egg. Therefore, a chemical change happens to the egg.

41. Question
What type of change occurs when a raw egg is boiled?

42. Answer
Chemical, because new kinds of matter are formed.

43. Every hand should be in the air by now!!!
Question
What are we supposed to learn from this lesson?
Every hand should be in the air by now!!!

44. The Difference Between Physical and Chemical Properties!!!
All Together Now…
The Difference Between Physical and Chemical Properties!!!