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標題:
chem(39) - simple I.S.
發問:
1)metal A: action on cold water: no observable changeaction on dilute hydrochloric acid: reacts and produces colourless gasheating their oxides with carbon: white solids turns silverymetal B:action on cold water: reacts vigorously and a colourless gas is producedaction on dilute hydrochloric acid: don't... 顯示更多 1) metal A: action on cold water: no observable change action on dilute hydrochloric acid: reacts and produces colourless gas heating their oxides with carbon: white solids turns silvery metal B: action on cold water: reacts vigorously and a colourless gas is produced action on dilute hydrochloric acid: don't attempt!! heating their oxides with carbon: no observable change metal C: action on cold water:no observable change action on dilute hydrochloric acid: reacts and produces colourless gas heating their oxides with carbon: no observable change a) i) Suggest what metal A can be. ii) Write a word equation to represent the reaction of its oxide with carbon. b) i) Suggest why the reaction metal B should not be added to dilute hydro. acid. ii) Suggest what metal B can be. c) i) Arrange the hree metals in order of decreasing reactivity. ii) Explain your answer in ci)
最佳解答:
ai) iron ii) 2Fe2O3(s) + 3C(s) --> 4Fe(s) + 3CO2(g) bi) explosion will occur ii) sodium ci) B>C>A ii) Only B has reaction with cold water while A and C don't; C can't be extracted from its oxide by carbon reduction but A can, which means oxide of C is more stable. As more reactive metal forms more stable compound, C is more reactive than A.
其他解答:
chem(39) - simple I.S.
發問:
1)metal A: action on cold water: no observable changeaction on dilute hydrochloric acid: reacts and produces colourless gasheating their oxides with carbon: white solids turns silverymetal B:action on cold water: reacts vigorously and a colourless gas is producedaction on dilute hydrochloric acid: don't... 顯示更多 1) metal A: action on cold water: no observable change action on dilute hydrochloric acid: reacts and produces colourless gas heating their oxides with carbon: white solids turns silvery metal B: action on cold water: reacts vigorously and a colourless gas is produced action on dilute hydrochloric acid: don't attempt!! heating their oxides with carbon: no observable change metal C: action on cold water:no observable change action on dilute hydrochloric acid: reacts and produces colourless gas heating their oxides with carbon: no observable change a) i) Suggest what metal A can be. ii) Write a word equation to represent the reaction of its oxide with carbon. b) i) Suggest why the reaction metal B should not be added to dilute hydro. acid. ii) Suggest what metal B can be. c) i) Arrange the hree metals in order of decreasing reactivity. ii) Explain your answer in ci)
最佳解答:
ai) iron ii) 2Fe2O3(s) + 3C(s) --> 4Fe(s) + 3CO2(g) bi) explosion will occur ii) sodium ci) B>C>A ii) Only B has reaction with cold water while A and C don't; C can't be extracted from its oxide by carbon reduction but A can, which means oxide of C is more stable. As more reactive metal forms more stable compound, C is more reactive than A.
其他解答:
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mind the use of words. No observable does not equal no reaction.|||||ai) Magnesium ii) 2MgO(s)+C(s)->2Mg(s)+CO2(g) bi) As B is too reactive, there is explosive reaction which is dangerous. ii) Potassium ci) B>C>A ii) As B reacts with cold water while A&C cannot. As C has no reaction when heating their oxides with carbon while A can, which means C is more reactive than A.
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