WHMIS
Science safety
Particle Theory
States of Matter
Experiments
100
What does the symbol with the picture of the fire represent?
Inflammable and combustible material
100
Why must you tie up long hair with a hair elastic?
So your hair doesn't accidentally catch on fire (bunsen burner), or get caught in a machine, when doing experiments
100
What happens to juice when you put it in the freezer? Why? What is happening to the particles?
It becomes a solid because the particles in the juice slow down and move closer together.
100
Name the state of matter: dish detergent
Liquid
100
What 2 metals did we test in the bimetal rod experiment?
Brass and steel
200
What does the symbol with the R represent?
Dangerously reactive material
200
Why must you always wear safety goggles when doing science experiments?
To protect your eyes from dangerous chemicals or from fire. Our eyes are very sensitive.
200
What happens to a spoon when you leave it in hot soup? Why? What is happening to the particles?
The spoon gets bigger because when particles are heated they move farther apart causing the spaces between the particles to get larger and the spoon expands.
200
Name the state of matter: yogurt
Liquid
200
What happened when we put the ball in the fire and tried to put it in the ring?
The ball didn't fit inside the ring.
300
What does the symbol with the skull and crossbones represent?
Toxic material (immediate effects)
300
Why must you always listen to your teacher?
Because we use dangerous materials in a Science class. We need to ensure safety by following instructions and using the equipment correctly.
300
What happens to a chocolate rabbit when it is left outside on a hot day? Why?
The rabbit melts because the particles in the solid are heating up, moving farther apart, and turning into a liquid.
300
Name the CHANGE in state gas --> liquid
Condensation
300
Name the law that explains why the ball did not enter the ring when it is heated.
Particles move faster and farther apart when heated
400
Why is it important that the same WHMIS system is used all over the world?
Because everybody uses the same chemicals and, no matter what language you speak, you should be able to identify dangerous materials and know how to handle them.
400
Why is it important not to fool around/ horseplay in science class?
It is really dangerous. You could seriously injure yourself or a classmate because there is dangerous equipment in the class (e.g., fire, chemicals)
400
Why are there spaces at regular intervals on a sidewalk?
Because in the summer it's hot and in the winter it's cold. There needs to be spaces in the sidewalk to give the cement room to expand and contract. If there were no spaces in the sidewalk, it would crack when the temperature changed.
400
Name the CHANGE of state solid--> liquid
Melting
400
When would you use steel instead of brass in the real world? Why?
-pots/pans -buildings Steel is a more stable metal. It isn't easily affected by temperature. For pots/pans, we are constantly subjecting them to heat. For buildings, we want the building to be as stable as possible so it doesn't collapse.
500
What does WHMIS stand for?
Workplace Hazardous Materials Information System
500
When heated, the rate of expansion of steel and cement is almost identical. Why is this important to consider when building sky scrapers?
We use both those materials to build sky scrapers. They would need to have identical expansion rates because if they didn't the building would crack or collapse.
500
Name the CHANGE of state solid--> gas
Sublimation
500
Why did the bimetal rod bend when it was put in the fire?
Because the brass expanded at a faster rate than the steel and both metals are attached. The particles of the brass moved farther apart then the particles of the steel.
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