NCERT Activity 3.10 Class 10 Science Explanation

Here you will find NCERT Activity 3.10 Class 10 Science Explanation that belongs to Chapter 3 Metals and Non-metals. After reading Solutions of chapter 3 Metals and Non-metals, you will be able to understand activity 3.10. Activity 3.9 is also very important for you, so you should study it.

NCERT Activity 3.10 Class 10 Science Explanation

 

Caution: This activity needs the teacher’s assistance.

Activity 3.10

·      Collect the samples of the same metals as in activity 3.9 

·      Put small pieces of the samples separately in beakers half-filled with cold water.

·      Which metals reacted with cold water? Arrange them in the increasing order of their reactivity with cold water.

·      Did any metal produce fire on water?

·      Does any metal start floating after some time?

·      Put the metals that did not react with cold water in beakers half-filled with hot water.

·      For the metals that did not react with hot water, arrange the apparatus as shown in fig. and observe their reaction with steam.

·      Which metals did not react even with steam?

·      Arrange the metals in the decreasing order of reactivity with water.

Reaction of metals with water

Observations and Conclusion

 (i)  K, Na and Ca react with cold water. K and Na produce fire on water. This is due to the heat energy produced in the reaction that burns the hydrogen evolved.

  2K+ H₂O →2KOH + H₂ + heat energy

 2Na + H₂O →2NaOH + H₂ + heat energy

 (ii)  Ca and Mg start floating sometimes. The H₂ produced in the reactions sticks with metal in the form of bubbles so these metals start floating.

Ca +  + 2H₂O →Ca(OH)₂ + H₂

Mg+  + 2H₂O →Mg(OH)₂ + H₂

(iii)   Al, Fe, and Zn react with steam and produce H₂. Cu did not react even with steam.

 2Al+ 3H₂O → Al₂O₃  + 3H₂

_{Metals such as lead, copper, and silver do not react with water.}

(iv)  Order of reactivity of the given metals with water is:

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

 Related Topics - 

1. Next activity - Activity 3.11

2. Previous activity -Activity 3.9

3. Solution of Chapter 3 Metals and Non-metals

4. MCQ Questions of Chapter 3

5. Extra Questions of Chapter 3

6. Solutions of Class 10 Science all chapters