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Year 8 Chemistry Homework Due: Monday 6th October Name:_____________________ Question 1: Physical & Chemical Changes state burn reversible physical melt different particles colour irreversible chemical If you heat ice it will ____ into water. This is a _________ change. Physical changes often involve a change of _____. They are __________ which means they can be easily undone. In a physical change, no new material is formed. If you heat bread it will _____ and become toast. Burning is a ________ change. Chemical changes are ______________ meaning they are difficult to undo. We can sometimes recognise chemical changes because we see a ______ change. In a chemical change, new materials formed that are _________ to the starting materials. This is because the _________ become rearranged. a. Give an example of a chemical change. b. Give an example of a physical change. c. When a chemical change happens we sometimes see a colour change. What other observations tell you that a chemical change is happening? _______________________________________________ Question 2: Metals and Acids Fill in the blanks Q.3 Explain the difference between and exothermic and endothermic reaction Hints: Which one gives off heat and which one takes it in? Why is heat given off or taken in (bonds) Give an example of each (ice melting and combustion) _______________________________________________ _______________________________________________ _______________________________________________ Q.4 How can you use limewater to test for the presence of carbon dioxide? _______________________________________________ _______________________________________________ _______________________________________________