Hello dear students. today we are going to
demonstrate an activity of a chemical change.
For this, we will take zinc granules,test
tubes, a test tube stand, candle and dilute
hydrochloric acid, so we have to show reaction
between zinc granules and hydrochloric acid.
Take a test tube and put some zinc granules
in it. Hold the test tube like this. Now with
a dropper add HCl .You can see bubbles of
a gas are forming, Now we have to check which
gas it is, by bringing a burning match stick
near the mouth of the test tube . So we noticed
the POP sound .This POP sound when produced
indicates the presence of Hydrogen gas.
 
 
