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26 Iron from a blast furnace is treated with oxygen and with calcium oxide to make steel. Which substances in the iron are removed? oxygen removes   calcium oxide removes A carbon     acidic oxides
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25 Some properties of metal J are listed. ● J does not react with cold water. ● J reacts with dilute hydrochloric acid. ● No reaction occurs when the oxide of J is heated with carbon. What is J? A ...
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23 Which row describes the trend in properties of the elements in Group I as the group is descended? melting point    reactivity with water A decreases     decreases B decreases      increases
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21 Element X is in Group II of the Periodic Table. Which statements about X are correct? 1 X is a metal. 2 X has two electrons in its outer shell. 3 X is a liquid at room temperature. A 1 and ...
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17 Three separate experiments are carried out on an aqueous solution of S. The results are shown. 1 Magnesium does not react with the solution. 2 A gas is given off when ammonium sulfate is heated with the solution. 3 ...
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16 Which statement is correct? A When anhydrous copper(II) sulfate is heated its colour changes to a deeper blue. B When hydrated copper(II) sulfate is heated its colour changes to a deeper blue. C When water is added to blue ...
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15 Zinc reacts with an acid to form a gas. The volume of gas produced is measured at intervals. The results are shown as curve Z. The reaction is repeated in the presence of ...
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13 Which changes occur when hydrogen is burned in oxygen? energy change    product A endothermic    H2O only B endothermic    H2O and CO2 C exothermic    H2O only D exothermic    H2O ...
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12 The complete combustion of propane is exothermic. The equation for this reaction is shown. C3H8 + 5O2 --> 3CO2 + 4H2O Which energy level diagram represents the complete combustion of propane? energy progress ...
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