1) What is the chemical name for salt that we eat? a) potassium sulphate b) sodium sulphate c) sodium chloride d) hydrochloric acid 2) Which of these is a compound? a) hydrogen gas b) magnesium c) iron oxide d) sulphur 3) What is an element? a) A substance that has two or more elements bonded together. b) A substance that cannot be broken down into smaller substances. c) A mixture of different types of atoms. 4) In a solid the particles a) slide over each other. b) vibrate on the spot. c) move fast in every direction. 5) Diffusion is a) the movement of particles in random directions from where there are many to where there are less. b) the movement of particles towards the light. c) the movement of solid particles when you push them. 6) A girl measures her number of heart beats when she is jogging and when she is sitting at rest. What is the dependent variable? a) Jogging b) Sitting at rest c) The number of heart beats d) The time that she jogs for. 7) A girl measures her number of heart beats when she is jogging and when she is sitting at rest. Name an independent variable. a) Jogging b) The number of heart beats. c) The time that she runs for. 8) A girl measures her number of heart beats when she is jogging and when she is sitting at rest. Name a control variable. a) Jogging b) The number of heart beats. c) The time that she jogs for. 9) Melting is the change of state when a) a solid turns to a gas. b) a solid turns to a liquid. c) a liquid turns to a solid. 10) Condensation is when a) a solid turns to a liquid. b) a gas turns to a solid. c) a gas turns to a liquid. d) a liquid turns to a gas. 11) Sublimation is when a) a solid turns to a gas. b) a solid turns to a liquid. c) a gas turns to a liquid. 12) An example of freezing is when a) a penguin swims under water. b) an iceberg forms in the sea. c) a polar bear catches a fish. 13) Evaporation a) is when particles in a liquid turn to a gas throughout the liquid b) is when particles turn to a solid at the surface of the liquid. c) is when particles in a liquid turn to a gas at the surface of the liquid. 14) An example of evaporation is when a) a kettle produces steam. b) a puddle disappears in the sun. c) water forms on a cold window overnight. 15) The melting point of a substance is the a) speed that it melts at. b) height that it falls from as it melts. c) temperature that it melts at. 16) A substance melts at 20C and boils at 50C. At 30C the substance is a) a solid b) a liquid c) a gas 17) Which of these statements is true? a) The lower the temperature, the faster the speed of diffusion. b) The lighter the particle, the faster the speed of diffusion. c) Liquids diffuse faster than gases in the same sized container. 18) Gas pressure is a) the force per unit area. b) the number of particles in a container. c) the size or particles in a container. 19) The chemical symbol of gold is a) Ag b) Al c) G d) Au 20) Aluminium and oxygen react together to form a) oxygen alumin b) aluminium oxygenate c) aluminium oxide 21) How many types of atom are there in HCl? a) 1 b) 2 c) 3 22) How many types of atom are there in HCl? a) 1 b) 2 c) 3 23) How many types of atom are there in HCl? a) 1 b) 2 c) 3 24) How many atoms are there in a molecule of water (H2O)? a) 1 b) 2 c) 3 d) 4 25) How many types of atom are there in NaCl? a) 1 b) 2 c) 3 26) How many types of atom are there in NaCl? a) 1 b) 2 c) 3 27) How many atoms are there in H2 gas molecules? a) 1 b) 2 c) 3 28) How many types of atom are there in H2 gas molecules? a) 1 b) 2 c) 3 29) How many types of atom are there in H2 gas molecules? a) 1 b) 2 c) 3

Year 7b revision

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