Laboratory Activity 4.4.2: Studying the reaction of halogens with iron wool. |
Problem statement: How do chlorine, bromine and iodine react with iron?
Hypothesis: Reactivity decreases for the reaction between halogen and water when going down Group 17.
Variable:
» | Fixed variable : Iron | |
» | Manipulated variable : Type of halogen | |
» | Responding variable : Reactivity of reaction |
Material: » Chlorine gas » Bromine solution » Iodine crystals » Potassium manganate (VII) » Sodium hydroxide solution » Iron |
Apparatus: » Delivery tube » Rubber stopper » Bunsen burner » Test tube » Conical flask » Thistle funnel » Filter funnel » Beaker » Combustion tube » Retort stand and clamp |
► | The animation below shows the procedures and observation of the experiment.
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► | (A) With chlorine
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► | (B) With bromine
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► | (C) With iodine
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► | Chlorine, bromine and iodine react with iron to form iron (III) halide. | |||
► | Chlorine react vigorously with iron to produce iron (III) chloride.
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► | Bromine reacts less vigorously with iron to produce iron (III) bromide.
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► | Iodine reacts slowly with iron to produce iron (III) iodide.
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► | The reactivity of the halogens with iron decreases when going down Group 17. |
► | Halogens react with iron. | |
► | The reactivity increases down the Group 17. | |
► | The hypothesis is accepted. |
⇲ For exercise(objective and subjective), download for free on Android OS. | ||
where experimnet
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