00:01
Hello students in this question we need to classify given phenomena as chemical or physical change.
00:08
So we know that chemical change are permanent.
00:15
Chemical change is a permanent change in which new species are formed and physical change is temporary change which can can be reversed.
00:33
So physical change is temporary.
00:38
So let's see the first one.
00:39
We have heating a mixture of iron and sulfur.
00:44
So this is going to be a chemical change.
00:47
This is because new species are going to form when iron and sulphur react together.
00:54
Second we have burning magnesium piece on burner.
00:58
This is also a chemical change because reaction would take place.
01:03
Third we have dropping magnesium peas in aquus hcl.
01:09
This is also a chemical change because magnesium will react with the acid.
01:17
Fourth we have adding hcl to nah co3.
01:24
This is definitely a chemical change.
01:27
Moving on to the fifth one...