Pure water can be produced by distillation Why is distillation not usually an

Pure water can be produced by distillation why is

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Pure water can be produced by distillation.Why is distillation notusually an economic method of treating water for drinking?[1 mark] (d) Drinking hard water has health benefits.State onehealth benefit of drinking hard water.[1 mark]
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4 Do not write outside the box (04) G/Jun14/CH3HP 2 (a) The structure of an alcohol is shown in Figure 2Figure 2HHHHCHCOH2 (a) (i) Draw a circle around the functional group in the structure of the alcohol.[1 mark] . 2 (a) (ii) What is the chemical name of this alcohol?[1 mark] Alcohols are used as fuels.A student plans an experiment to find the energy released per gram of alcohol burned. The student uses the apparatus shown in Figure 3 . Figure 3 Water Glass beaker Thermometer Alcohol burner 2 (b) (i)Suggest twoways that this apparatus could be improved to obtain accurate results. [2 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................
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5 Do not write outside the box 2 (b) (ii)In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate.Describe how the student should do this experiment.You should include any measurements the student should make.Do notdescribe any improvements to the apparatus.Do notdescribe how to do any calculations.[6 marks]
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6 Do not write outside the box 3 In 1869, Dmitri Mendeleev produced his periodic table of the elements.Mendeleev placed the alkali metals in the same group.3 (a) What evidence did Mendeleev use to decide that the alkali metals should be in the same group?[1 mark] Describe how the elements in the modern periodic table are arranged: in terms of protons[1 mark] in terms of electrons.[1 mark] State twoproperties of transition elements that make them more useful than alkali metals for making water pipes.[2 marks]
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7 Do not write outside the box (07) G/Jun14/CH3HP Turn over 3 (d) Describe and explain the trend in reactivity of the alkali metals (Group 1). [4 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ____ 9 Turn over for the next question
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8 Do not write outside the box
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