Here you will find NCERT Activity 3.13 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 3.13.
NCERT Activity 3.13 Class 10 Science Explanation
Activity 3.13 Class 10 Science
· Take
samples of sodium chloride, potassium iodide, barium chloride or any other salt
from the science laboratory.
· What
is the physical state of these salts?
· Take
a small amount of a sample on a metal spatula and heat it directly on the flame. Repeat with other samples.
· What
did you observe? Did the samples impart any colour to the flame? Do these
compounds metal?
· Try
to dissolve the samples in water, petrol and kerosene. Are they soluble?
· Make
a circuit and insert the electrodes into
a solution of one salt. What did you observe? Test the other salt samples too
in this manner.
· What
is your inference about the nature of these compounds?
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Observations:
All the salts taken were solid. Each salt imparted a particular colour to the
flame. The compounds did not melt on heating. The compounds were soluble in
water but hot in kerosene. The electric bulb glows on passing electric current.
All these properties showed that the compounds are ionic in nature.
Conclusion:
(i) Ionic compounds are generally solids.
(ii) They impart a characteristic colour to the flame.
(iii) They are soluble in a polar solvent like water and insoluble in non-polar solvents like kerosene, petrol etc.
(iv) Their aqueous solution conducts electricity.
Related Topics -
1. Next activity - Activity 3.14
2. Previous activity -Activity 3.12
3. Solution of Chapter 3 Metals and Non-metals
5. Extra Questions of Chapter 3
6. Solutions of Class 10 Science all chapters
