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6 Polymers are large molecules built up from small molecules. (a) State the name given to the small molecules from which polymers are made. .............................................................................................................................................. [1] (b) The formula of a polymer is shown. n
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(e) Name the reagent and suggest the conditions needed to convert organic compound U into organic compound S. reagent ...................................................................................................................................... conditions .................................................................................................................................. [3] (f) Organic compound S can be converted to organic compound Q by ...
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(h) Some salts can be made by titration. In a titration experiment, 20.0cm3 of aqueous sodium hydroxide reacts exactly with 25.0cm3 of 0.100mol/dm3 dilute sulfuric acid to make sodium sulfate. 2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l) (i) Circle the name ...
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4 A student wanted to make some zinc chloride crystals. The student followed the procedure shown. step 1 Add excess zinc powder to dilute hydrochloric acid to form aqueous zinc chloride. step 2 Remove ...
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3 This question is about ammonia. (a) Nitrogen reacts with hydrogen to form ammonia in an industrial process. N2(g) + 3H2(g) --> 2NH3(g) (i) Name this industrial process. ....................................................................................................................................... [1] (ii) State the meaning of ...
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2 The elements shown are gases at room temperature and pressure. hydrogen nitrogen oxygen chlorine (a) State which one of these gases is green. .............................................................................................................................................. [1] (b) The gases shown exist as diatomic molecules. State ...
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(d) Aqueous ammonia reacts with aqueous copper(II) ions to produce compound B. The formula of compound B is CuN4H16O2. Complete the table to calculate the relative molecular mass of compound B. type of atom  ...
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8 Aqueous ammonia is an alkali. (a) Complete the dot-and-cross diagram to show the electron arrangement in a molecule of ammonia. N H H H [2] (b) Complete the word equation for the reaction of ...
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