Lab safety
Separation Methods
Variables and hypothesis
Matter
Changes of state
100
What safety procedure is missing from this classroom?
Safety goggles!
100
What is the process used to separate two liquids that are of different densities?
A mixture of liquids that is left to settle, so the two liquids are visible as two different layers
100
What is the proper term for an educated guess used in science?
Hypothesis
100
What are the 4 states of matter?
Solids, liquids, gases and plasma
100
What is it called when a solid turns into a liquid?
Melting
200
What have these students done correctly in this photo?
Safety glasses, worn their hair back, stand up!
200
What is the process that you use to separate a mixture of different sized solids?
sieving
200
What is an independent variable?
A variable that you change
200
Draw the particle model for a solid.
Atoms are tightly packed together in a fixed shape.
200
What is it called when a liquid turns into a solid?
Freezing
300
What does this symbol on the side of a chemical bottle mean?
Flammable
300
What is the process that you used to separate magnetic materials from non-magnetic materials?
Magnetism
300
What is a dependent variable?
The variable that you measure
300
Draw the particle model for a liquid.
Atoms are close together in a regular pattern and move past each other randomly.
300
What is it called when a liquid changes into a gas?
Boiling
400
What kind of shoes should you wear in the lab?
Closed shoes with no holes
400
What is the process that you use to separate an insoluble solid from a liquid?
Filtration
400
What is a controlled variable?
the variables that you keep the same
400
Draw the particle model for a gas.
Atoms far away from each other and moving quickly randomly within the container.
400
What is it called when a gas turns into a liquid?
Condensation
500
What does this symbol on the side of a chemical bottle mean?
Hazard to the environment/living things
500
What process is best used to separate solutions - mixtures in which a sold has dissolved in a liquid AND the process where the gas is then condensed and collected?
Evaporation and condensation
500
Why are controlled variables important?
To ensure that the change is occurring as a result of the independent variable
500
When a substance is heated the particles begin to _____________ and ______ _______.
Expand and move faster.
500
What is it called when a solid turns into a gas?
Sublimation