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1) This is a... a) mixture b) element c) compound 2) This is a... a) mixture b) element c) compound 3) This is a.. a) mixture b) element c) compound 4) This is a... a) mixture b) element c) compound 5) This is a... a) mixture b) element c) compound 6) This is a... a) mixture b) element c) compound 7) The substances at the start of the reaction are called a) mixtures b) products c) reactants d) chemicals 8) The substance(s) at the end of the reaction are called a) reactants b) final c) products d) atoms 9) A sign of a chemical reaction a) It has changed colour b) It has changed shape c) It has bubbled d) It has melted e) It has produced a smell 10) TRUE or FALSE - A chemical reaction can be reversed a) TRUE b) FALSE 11) When a new substance has been made a) chemical reaction b) physical reaction 12) It can be reversed a) chemical reaction b) physical reaction 13) Melting is an example of a a) chemical reaction b) physical reaction 14) How many different elements are in H2O  ? a) 1 b) 2 c) 3 d) 4 15) How many different elements are in O2 ? a) 1 b) 2 c) 3 d) 4 16) How many atoms in total are in H2O? a) 1 b) 2 c) 3 d) 4 17) How many atoms in total are in CO2 ? a) 1 b) 2 c) 3 d) 4

Compounds and Chemical Reactions

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