Labs and Safety
What is a controlled variable?
Something that you keep the same during an experiment.
What state of matter is not a fluid?
Solid
What does a mixture contain two or more of?
Pure Substances/Types of Particles
When something can be dissolved in a solvent we say it is in that solvent.
Soluble.
What is the term for the matter that stays behind during filtration?
Residue.
What is the WHMIS symbol for "instantly toxic".
Skull and Crossbones (yarr harr maties)
What is the phase change from liquid to gas called?
Vaporization. I will accept Evaporation and Boiling.
There is only one kind of homogenous mixture. Name it.
Solution
What are detergents used for?
What is the name of the process of removing salt from water?
Desalination
What does the WHMIS symbol for "Oxidizer" look like?
Flame Over Circle
Which state of matter has the highest energy particles?
Gas. I will also accept Plasma if you're feeling fancy.
What is the term for a mixture that has two clearly distinct parts called phases?
Solute, solvent, temperature.
In distillation, the separated components of the mixture are collected as...
..condensed liquids.
Jeremy wants to test the effect of fertilizer amount on the growth of his grass.
What are the independent and dependent variables for this experiment?
Independent/Manipulated: Amount of fertilizer
Dependent/Responding: Grass Growth
What is the phase change from solid to gas called?
Sublimation
Explain the difference between a suspension and a colloid.
A suspension has small dispersed particles that settle over time. A colloid has smaller particles that do not settle.
Name three ways to increase the rate of dissolving.
Increase temperature, agitation/stirring, increase surface area, increase pressure.
What is the difference between normal and fractional distillation?
What does WHMIS stand for?
Workplace Hazardous Materials Information System
Which state of matter has a definite volume but an indefinite shape?
Liquid
Explain why water is a pure substance but air is a mixture despite both containing multiple elements.
Water is a compound, meaning the elements have fused into a single kind of particle. In air, the element particles are separate, they just mix together.
How do you create a supersaturated solution?
Make a saturated solution at a higher temperature and let it cool without disturbing it.
Do substances with low boiling points exit a fractional distillation column at the top or bottom?
At the top. A low boiling point means it stays a gas even at low temperatures.