Fechar
What is the difference between a physical and chemical change?
Why is it that physical changes can often be easily reversed?
What is the simplest example of a physical change?
What is the difference between expansion and contraction?
What is melting?
What happens when liquid water is put in the freezer?
What is a solution?
What happens in a solution?
What are the four indications of a chemical change?
Why is it that change in colour is likely a chemical change?
What is an example of a physical change that can also cause a change in colour?
What indicates the production of gas in a chemical change?
What indicates that a chemical change occurred when two solutions mix?
Why is it that light or change in temperature indicates a chemical change?
Why does a chemical ice pack feel icy cold?
What is an example of a physical change that causes a change in temperature?
Why is it that recycling is a series of physical changes and not chemical changes?
Why is it that heating the air inside a hot-air balloon allows it to float?
Give an example of an exothermic reaction.
Why is aluminium recycled?
