1. Matter and Chemical Change
Unit B
Matter and Chemical Change

2. Section 1.0 Physical and Chemical Properties
Chemistry is the science of studying the properties of matter and how it changes.
Matter is anything that has mass and occupies space.

3. Section 1.1 Laboratory Safety
Household Hazardous Materials Warning Labels:
Some materials used in the lab and at home are hazardous and therefore have a hazard symbol.
These symbols show the reader two things:

4. Triangle means “caution”
1. Shape = how hazardous the material is
Triangle means “caution”
Diamond means “warning”
Octagon means “danger”
2. Picture = the type of hazard
*See fig. 1.2 (p. 94) for all hazard symbols

5. WHMIS Symbols:
The Workplace Hazardous Materials Information System is another system of warning symbols designed to protect people who use harmful substances at work.

6. In your notes, create a chart to compare and contrast warning labels and WHMIS labels.
Read Lab Safety Rules (p 95)
Read Toolbox 1 (p 478)
Do Worksheet “Safety in the Science Classroom”

7. Section 1.2 Organizing Matter
Matter exists in different states (solids, liquids and gases).
The state if matter depends on its temperature:
Low Temperature High Temperature

9. Properties - characteristics used to describe a substance
Physical Properties – these properties explain the appearance and composition of a substance.
Examples include:
Texture
Shape
Size
Colour
Odour
Mass
Density
Melting Point
- Boiling Point
- Solubility
- Ductility
- Malleability

10. Physical Change – Any change not involving a change in the substance's chemical identity. A physical change involves only a change in physical properties. In other words, the type of matter has not been changed.
Examples include:
Changes of state
Dissolving
Absorption of water into a towel
Crumpling a piece of paper
Pulling copper into a thin wire (change of shape, but not change of composition)
Cutting a material
Breaking glass
Writing on a Sheet of Paper

11. Chemical Properties – these properties explain how a substance reacts with another substance.
Examples include pH
Reactivity
Toxicity
Combustibility
Chemical stability
Behavior in air

12. Chemical Change – when two or more substances react and one or more new substances are formed having different properties from the initial substances.
Examples include:
Combustion
Mixing an acid and a base
Photosynthesis
Iron Rusting

13. Do Investigation B-1 P.100
Identifying the Mystery Substance

14. Pure Substances and Mixtures
A pure substance consists of only one kind of matter and has its own unique set of properties. Elements and compounds are pure substances.
Elements: a material that cannot be further broken down. These are the basic building blocks for compounds.

15. Compounds: two or more elements chemically combined in a
specific arrangement and proportion.

16. A mixture is a combination of pure substances
A mixture is a combination of pure substances. Each substance retains its properties since there is no chemical reaction that takes place.
There are 4 types of mixtures:
Mechanical mixture – each substance that makes up the mixture is distinct or visible. An example is chili.

17. Solution – the substances are NOT visibly distinct from each other
Solution – the substances are NOT visibly distinct from each other. One substance, the solute, is dissolved into the other, the solvent. An example is Kool-Aid. Substances dissolved into water are called aqueous solutions.

18. Suspension – tiny particles of one substance are held within another in a cloudy mixture. These particles can be filtered out. An example is tomato juice.
Colloid - another cloudy suspension, but with particles so tiny that they cannot be filtered out. An example is milk.
See Figure 1.11 on page 103

19. Now Do Check and Reflect P.104 #1-10
Answer Analyzing and Interpreting # 20,and 23

20. Section 1.3 Observing Changes in Matter
Recall from section 1.2 that in a physical change only the substance’s physical properties change. For example, a change in state. No new substances are produced.

21. A chemical change is when two or more substances react and create new materials which have different properties from the initial substances.
Evidence of chemical change is as follows . . .

22. 1. Change in color

23. 2. Change in odor

24. 3. Formation of a solid or a gas

25. 4. Release or absorption of heat or light energy

26. Sometimes, it is impossible to tell if a substance has undergone a physical or a chemical change without chemical analysis in a lab.

27. Do Investigation B-2 P. 106
Investigating Physical and Chemical Change

28. Controlling Changes in Matter
Understanding and controlling changes in matter can help us meet our basic needs.
One example is freeze-drying. Food is frozen, then put under pressure so that the ice sublimes, and about 98% of water is removed.
Food that has undergone this process is about 10% of its initial mass and can be eaten months, sometimes years later.
The technique can be used by biologists to study tissue samples or restore important water-damaged documents.

29. Another example is MRE or “Meal Ready to Eat”
Another example is MRE or “Meal Ready to Eat”. The US Army uses special packaging to heat their freeze-dried foods called a “Flameless Ration Heater”. This package contains magnesium, iron and salt – when water is added, heat is released and it warms the MRE so it is ready to eat!

30. Scientists are also able to change common materials into other substances. Corn is first fermented, then new substances are collected, purified and made into biodegradable plastics (pop bottles), solvents such as nail polish remover and gasohol which can be used as vehicle fuel.

31. Now Do Check and Reflect P.109 # 1-7
And Section Review P.110 #1,2,6,8,9,12,15