Explain the following:. a) rusting of iron is a chemical change. b) melting of sulphur is a physical change.c) growth of a seedling into a tree is a chemical change. d) digestion of food is a chemical change. e)Burning of a wax candle is both a physical and chemical change
Answers
Explanation:
first one is rusting of iron means when you rust iron it will
changes into rust and again it was not converted into iron
means chemical change is a permanent change okkk
...
but in the case of physical change
as u told melting of sulphur ...it will changes its state and converts into liquid so ...
it can also changes into solid again when u freezes it ...
so by this conclusion is that physical change is a reversible change ...
....ok
I think this will help you
Answer:
here is your answer
Explanation:
a) iron reacts with oxygen to form iron oxide , chemical composition changes
b) as temperature rises , sulfur just melts into its liquid form , it just changes state and not the chemical composition
c) a seed changes into a tree by nutrition and growth , the constituents of the seed changes from simple nutrients to vascular bundles and many other cells and tissues
d)digestion of food causes breakdown of nutrients into simpler substances , chemical composition changes
e)melting of wax is change of state and hence physical change , burning of wick (combustion) hence chemical change