Activity 3.10 Class 10 Science

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In this activity, we will study the reaction of metals with water and arrange the
metals in order of reactivity with water.

Activity 3.10 Class 10 Science

 

Reactivity of Metals with Water

 

Aim of the activity

 

To study how metals react with water

 

Materials Required

   1. Sample pieces of K,Na,Ca,Mg,Al,Zn,Fe,Cu

   2. Cold water, hot water and steam

   3. Beakers

   4. Tongs

   5. Match box

   6. Safety goggles and gloves

 

Procedure

 

We take small pieces of metals and put them into separate beakers half filled with
cold water. Now we observe formation of bubbles, fire and metal floating.

Now we repeat the same test with hot water for those metals that didn’t react with
cold water. And finally, we test with steam for those metals that didn’t react even with hot water.

 

Activity 3.10 Class 10 Science reaction with water

 

Observation

 

On the basis of the above experiment, we observe

Activity 3.10 Class 10 Science observation

 

Explanation

 

Sodium and potassium reacts with cold water violently and catch fire.

 

 2K+ H2O →2KOH + H2 + heat energy

 

 2Na + H2O →2NaOH + H2 + heat energy

 

Calcium also reacts with cold water and floats due to formation of hydrogen gas
bubbles.

 

 Ca +  + 2H2O →Ca(OH)2 + H2

 

Magnesium and zinc react with hot water.

 

  Mg+  + 2H2O →Mg(OH)2 + H2

 

 Aluminium and iron react slowly with steam.

 

   2Al+ 3H2O → Al2O3  + 3H2

 

Copper does not react with water or steam.

 

Order of reactivity of the given metals with water is:

 

K >Na > Ca > Mg > AI > Zn > Fe > Cu

 

 

Conclusion

 

This activity demonstrates that metals show different levels of reactivity with water.

Some metals are highly reactive and some are moderate.

 

 

Frequently Asked Questions

 

    1. Which metal catch fire with cold water?

Answer
Potassium and sodium

 

    2. Why do some metals float on water?

Answer
because hydrogen gas is formed and stick to the metal so metals float.

   

    3. Which metal does not react with water?

Answer
Copper

 

   4. Which gas is produced when metals react with water?

Answer
Hydrogen gas

 

   5. Why doesn’t aluminium react with water?

Answer
Aluminium has an oxide layer that prevents the  reaction with water.

 

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