Question

Compose an activity to arrange calcium magnesium and Iron  The decreasing order of their reactivity

Answer 1

Answer:

Step 1:- Take metals calcium (Ca), Magnesium (Mg) and iron (Fe). step 2:- place separately small pieces of those metals in beakers with small amount of water in them. step 3:- if the metal react with cold water, then reaction will be vigorous. if the metal doesn't react with cold water, then treat it with hot water.

Explanation:

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Answer 2

Answer:

step 1:- Take metals calcium (Ca), Magnesium (Mg) and iron (Fe).

step 2:- place separately small pieces of those metals in beakers with small amount of water in them.

step 3:- if the metal react with cold water, then reaction will be vigorous.

if the metal doesn't react with cold water, then treat it with hot water.

step 4:- Record the observations and arrange the metals in decreasing order of reactivity.

we observe :

Ca + 2H2O(cold water) => Ca(OH)2 + H2

Mg + 2H2O (hot water) => Mg(OH)2 + H2

3Fe + 4H2O( steam) => Fe3O4 + 4H2

hence, reactivity order Ca > Mg > Fe

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