Answer :
how it looks. basically the thing that tells you how it change. for example if an ice cube was melted (heat), it only changed physically not chemically as the h20 molecules are still there. however lets say you burn woos— you cant get that would back. its ash now and it has changed chemically.
To identify if an object has undergone a physical change, one needs to know;
1) What state of matter it was
2) What its shape was
3) What its size or volume was
To identify if an object has undergone a chemical change, one needs to know;
1) What its initial colour was
2) What its initial temperature was
3) Whether it had an odour or not
A chemical change leads to the formation of a new substance while a physical change does not lead to the formation a new substance.
Chemistry is all about the study of the changes that matter undergoes. These changes may be;
- physical
- chemical
A chemical change leads to the production of new substances and it is no easily reversible. There may be absorption or evolution of heat during a chemical change. Rusting of iron is a chemical change.
We can see from the checks listed above that a physical change deals with change in appearance and not change in composition of a substance
On the other hand, a physical change is easily reversible and no new substance is formed. Melting of ice is a physical change.
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