identity physical and chemical changes, and uunderstand the difference between atoms, elements and compounds.
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A physical change is a reversible change in which only the physical properties of a substance changes, such as colour, shape, size. Eg. Crumpling of a paper
A chemical change is an irreversible change in which the chemical composition of the substance changes. Eg. Electrolysis of water
DIFFERENCES
1) Atom- An atom is the smallest constituent unit of matter.
2) Element- An element is an atom having the same no. Of protons. Eg. Oxygen
3) Compound - it is a heterogenous combination of 2 or more elements
A chemical change is an irreversible change in which the chemical composition of the substance changes. Eg. Electrolysis of water
DIFFERENCES
1) Atom- An atom is the smallest constituent unit of matter.
2) Element- An element is an atom having the same no. Of protons. Eg. Oxygen
3) Compound - it is a heterogenous combination of 2 or more elements
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