For each of the following experiments, state all observable change(s) and write chemical
equation(s) involved. Give also the states of substances in the equations.
(a) A piece of iron is added to dilute sulphuric acid in a test tube.
(b) A small piece of potassium is placed in a trough of water.
(c) Iron powder is burnt in a Bunsen flame.
救我!!!F.4 Chem...Reactivity of metals***plz~
2006-11-05 4:10 am
回答 (2)
2006-11-05 4:36 am
✔ 最佳答案
(a) iron(s) + dilute sulphuric acid(aq) → iron sulphate(s) + hydrogen(g)During the piece of iron reacts with dilute sulphuric acid in a test tube, it gives out gas bubbles.
(b) potassium(s) + water(l) → potassium hydroxide(s) + hydrogen(g)
During the piece of iron reacts with water, it gives out hissing sound.
(c) iron(s) + oxygen(g) → iron(II, III) oxide
After the iron powder is burnt in a Bunsen flame, it is dull in colour.
2006-11-04 20:36:50 補充：
iron(s) oxygen(g) → iron(II, III) oxide (s)
2006-11-05 4:49 am
A) no reaction
b) there is gas envolved , metal is floated arround and combusted on water, brick fire is formed,explosion happen
c)black powder is formed,yellow spark is formed
2006-11-04 20:59:29 補充：
a is wrong answerFe(s) H2SO4(aq) H2O(g)----- FeSO4(aq) H2O(l)Na(s) H2O(l)----- NaOH(aq) H2(g)Fe(s) O2(g------- Fe2O3(s)
b) there is gas envolved , metal is floated arround and combusted on water, brick fire is formed,explosion happen
c)black powder is formed,yellow spark is formed
2006-11-04 20:59:29 補充：
a is wrong answerFe(s) H2SO4(aq) H2O(g)----- FeSO4(aq) H2O(l)Na(s) H2O(l)----- NaOH(aq) H2(g)Fe(s) O2(g------- Fe2O3(s)
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