1) In a chemical reaction a) a new substance is made b) no new substance is made 2) In a physical change a) a new substance is made b) no new substance is made 3) What are the products of a reaction between a metal and water? a) salt + hydrogen b) metal hydroxide + hydrogen c) salt + water 4) Dissolving a non-metal oxide in water makes a) an acid b) an alkali 5) What are signs of a physical change? a) a change in shape b) a change in state c) dissolving d) all of the others 6) What are the signs of a chemical change? a) a change in temperature b) a change in state c) a change in colour d) all of the above 7) What are the products of a reaction between a metal and acid? a) salt + hydrogen b) metal hydroxide + hydrogen c) salt + water 8) Dissolving a metal oxide in water makes a) an acid b) an alkali 9) What are the products of a reaction between a metal and water? a) salt + hydrogen b) metal hydroxide + hydrogen c) salt + water 10) What are the products of a reaction between an acid and an alkali? a) salt + hydrogen b) metal hydroxide + hydrogen c) salt + water 11) What is used to extract iron? a) carbon b) hydrogen c) potassium 12) The reactivity of a chemical is a) how big the bang is b) how much the colour changes c) how quickly it reacts 13) Which metal is the most reactive? a) zinc b) potassium c) magnesium 14) What is the chemical equation for rusting? a) iron + water → rust b) iron + oxygen → rust c) iron + water + oxygen → rust

Chemical Reactions Yr 8

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