1) Is this a picture of a gas, liquid or solid? a) solid b) liquid c) gas 2) Is it a gas, liquid or solid? The particles move fast and freely. They are very far from each other. a) solid b) liquid c) gas 3) Is this a picture of a solid, liquid or gas?  a) solid b) liquid c) gas 4) Is it a gas, liquid or solid? The particles are arranged regularly and they are very close together. a) solid b) liquid c) gas 5) Which picture shows a gas?  a) b) c) 6) Is tea a solid, liquid or gas? a) solid b) liquid c) gas 7) Is salt a solid, liquid or gas?  a) solid b) liquid c) gas 8) Is helium (in party baloons) a solid, liquid or gas? a) solid b) liquid c) gas 9) On a hot summer day chocolate will ___________ a) freeze b) melt 10) If we put water in a freezer, it will ___________ a) melt b) freeze 11) Which material is best for making a window because it lets light pass through? a) wood b) glass c) rubber d) metal 12) Which of these is a chemical reaction? a) Modelling play-dough b) Paper burning in a fire c) Water freezing in the winter d) Ice melting in the sun 13) Which of these is NOT a reaction? a) Rusting a bike b) An apple turning brown c) Freezing water d) Milk going sour ( = kyslý) 14) Which of these can be a reaction? a) The shape changes b) A new colour appears c) The object is moved d) The colour stays the same 15) Which of these can be a reaction? Be careful - more answers are correct. Find them all. a) When we feel a new smell b) When we see a colour change. c) When we see bubbles d) When the substance does not change.

5-minute test: Materials

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