Question

please answer these questions.. very needed

1. Write the difference between Physical and chemical change.
2. Compare the properties of solution,colloids and suspension.

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Answer 1

Answer:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

A solution is always transparent, light passes through with no scattering from solute particles which are molecule in size. ... If a suspension is allowed to stand the particles will separate out. A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid will not.

Answer 2

1.

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. ... All chemical reactions are reversible although this can be difficult in practice.

2.

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