Lab safety
Metals and acids
Variables and hypothesis
Matter
Changes of state
100
What safety procedure is missing from this classroom?
Safety goggles!
100
Metals are found where on the periodic table?
The left and centre.
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 pH of lemon juice? What colour would litmus paper turn?
Between 1-6, red.
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 pH of sodium hydroxide?
Between 8-14.
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
Name 3 metallic elements.
Gold, copper, iron, silver, sodium, calcium, mercury, etc...
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
Use 3 words to describe metals.
Shiny, sonorous, malleable, ductile, conductors, dense, high melting point, etc...
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