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Novosadov [1.4K]
3 years ago
11

Which of the following are considered pure substances?

Chemistry
2 answers:
Tanzania [10]3 years ago
8 0

Element. Everything is else is a mixture, therefore not pure.

Ganezh [65]3 years ago
3 0

Answer: A. Element and B. Compound

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper Cu

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water H_2O

Heterogeneous mixture : It is a mixture that has non-uniform composition throughout the solution and the particle size or shapes are also different.There is a physical boundary between the dispersed phase and dispersion medium.

Homogeneous mixture:  It is a mixture that has uniform composition throughout the solution and the particle size or shapes are not different.There is no physical boundary between the dispersed phase and dispersion medium.

Thus element and compound are pure substances.

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An atom can expand its octet is it has empty d orbital

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Out of given elements only chlorine has empty d orbitals in its valence shell

Thus only chlorine can expand its octet.

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