1) What is a mixture? a) A mixture is formed when a chemical reaction has occurred.  b) Two or more materials 'combined' together without any chemical reaction between them. c) 2) How could we separate raisons and flour a) Pour through filter paper b) Sieve c) Use a magnet d) Pass electricity through 3) Which of the following mixtures could be separated by sieving? a) marbles and counters b) water and flour c) water and sand d) sand and gravel 4) What would you use to separate sand and water? a) A sieve b) Filter paper and a funnel 5) What word should a prediction always contain? a) prediction  b) guess c) because d) correct 6) What is filter paper? a) A plastic cone used for filtering b) Paper with very small holes, used for separating materials c) Normal writing paper, in the shape of a circle 7) What is the independent variable?  a) The variable that you measure in an experiment b) The variable that you change in an experiment c) The variables that you keep the same  8) What is the dependent variable? a) The variable that you measure in an experiment b) The variable that you change in an experiment c) The variables that you keep the same 9) What are the control variables? a) The variable that you measure in an experiment b) The variable that you change in an experiment c) The variables that you keep the same

Sieving and filtering

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