What is matter?
What does the state of matter depend on?
What is the difference between physical changes and chemical changes of matter?
How do we call the physical changes that matter undergoes when it changes from one physical state to another because of a change of temperature? Draw the diagram.
What is a pure substance? What is a mixture? What is a solution?
What is the difference between a homogeneous mixture and a heterogeneous mixture? Give examples.
What is oxidation? And combustion?
What techniques would you use to separate a mixture of oil and water, a mixture of sand and water, a mixture of salt and water, and to separate a mixture of iron and sand?
It’s very cold and you are talking outside. Why does white vapour come out of your mouth? Is this a chemical change or physical change?
Lets see what you know about water: Is it a pure substance or a mixture? Is it a simple substance or a compound? Why? What is its boiling point?
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