Quick Questions
Name the process that changes a gas into a liquid.
Condensation
What is a chemical change?
When a new substance is produced, gas/bubbles are produced, heat is produced and/or there is a change in colour.
For evaporation to occur what must you add?
Heat
Name the three states of matter and give one example of each
Liquid - plus example
Solid - plus example
Gas - plus example
Name the process that changes a solid into a liquid.
Melting
Why is burning a chemical change?
A new substance is produced and heat is created.
What do you need to do to make a physical change happen?
Do both liquids and gases take the shape of the container they are in? Explain
Yes, because they are free moving
What is a physical change?
Name and explain one chemical change experiment and the chemical reaction that occurred
- skittles and hot water
- milk/detergent
Explain why melting ice is a physical change.
You can change it back (reversible)
What is matter?
Anything that has mass and takes up space.
What is the physical state called that changes a liquid to a solid?
Freezing
Why might chemical changes be dangerous?
What physical change is fog on a bathroom mirror.
condensation
When the molecules are spread out a little bit and move slowly, what state are they in?
Liquid
What are molecules?
Two or more atoms joined together.
Tell 3 ways you know that a chemical reaction has occurred.
bubbles- produced gas, new substance formed, new colour, heat produced
Name 5 physical changes
ripping, freezing, melting, condensation, evaporation
Describe the arrangement of molecules and how they move in all three states of matter.
gas- spread out, move quickly
liquid- somewhat spread out, move freely
solid- close together, vibrate a little