1. Chemicals and Safety

2. Helpful and Harmful Chemicals
Matter includes both helpful and harmful solids, liquids and gases.
Example 1
O2 gas is needed by all plants and animals to survive but, NO2 (nitrogen dioxide) from car exhaust is poisonous

3. Helpful and Harmful Chemicals
Example 2
Among liquids, water is essential for human survival, but sulfuric acid can cause serious burns if it comes in contacts the skin.
Brain POP- Water

4. Helpful and Harmful Chemicals
Example 3
We put salt crystals (NaCl) on our food, but crystals of sodium cyanide are a lethal poison.
Brain POP- Salt

5. How do we know if a substance is safe to use?
We must look at the warning symbols placed on containers.
Hazardous Household Product Symbols
WHMIS Symbols- Workplace Hazardous Materials Information System
See handouts- place in notebook. You are responsible for knowing these symbols!
Do WHMIS and Safety Activity

6. Discussion Questions
Why is it important to standardize safety symbols?
Do you think it is always wise to pour waste chemicals and solutions down the sink with lots of water?
Why do people wear face masks when spray painting a car?

7. Discussion Questions
Why do hairdressers wear gloves when using chemicals to straighten hair?
Why do firefighters wear breathing apparatus when entering a burning building?

8. Lab Safety

9. Activity
Matching
Groups of 2
Match the scenarios with the rules