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Kezdőlap Jellemzők Díjcsomagok
1) Which one is not a sign of a chemical reaction? a) Gas given off b) Colour change c) Substance melts 2) Exothermic reaction a) Heat is given out b) No temperature change 3) Precipitate forms when... a) A solid melts b) Two solutions form a solid 4) Burning is an example of an exothermic reaction a) True b) False 5) Blowing bubbles into water is a chemical reaction a) True b) False 6) Cooking is a chemical reaction a) True b) False 7) An example of an endothermic reaction is... a) A heat pack used in sports injuries b) An ice pack used in sports injuries 8) When magensium reacts with acid there are bubbles produced and the temperature increases. Idenitfy the signs of a chemical reaction. a) Gas given off and a precipitate b) Energy change and colour change c) Gas given off an energy change 9) Identify the sign of a chemical reaction when toast is made from bread. a) Energy change b) Colour change c) Precipitate forms 10) When a candle burns which statement is true? a) Only the melting of the wax is a chemical reaction b) Only the burning is a chemical reaction

E Chemical Reactions

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