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Answer 1

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Here is a good question in chemistry

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Explain why soap form scum with hard water whereas detergents do not.

◆ Hard water contains ions of calcium and magnesium which reacts with soap molecules to form insoluble prepared called soap scum.

See the attachment above for example

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Answer 2

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Ques:What do you mean by Velocity ❓❓

Answer: Velocity is the rate of change of displacement with time .

It is a vector quantity .

Its unit is m/s

Its dimensional formula is

[M(0) L(1) T(-1)]

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