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Nitrogen cycle : Denitrification :: carbon cycle : -----Nitrogen cycle : Denitrification :: carbon cycle : -----carbon dioxide into carbohydrateshighly reactive with other elements​

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✠Question

➤ Differentiate between :-

Physical change and Chemical change.

Compound and Mixtures.

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✠Answers

➽ Physical change :-

In a physical change, only physical properties such as colour, physical state, density volume, etc. change; chemical properties remain unchanged.

No new substance is formed in a physical change.

Very little or no energy in the form of heat, light or sound is usually absorbed or given out in a physical change.

A physical change is a temporary change.

The original form of substance can be regained by simple physical methods.

A physical change in reversible.

➽ Chemical change :-

In a chemical change, the chemical composition and chemical properties undergo a change.

A new substance is formed in a chemical change.

A chemical change is always accompanied by absorption or evaluation of energy.

A chemical change is a permanent change.

Original substance cannot be obtained by simple physical methods.

A chemical change is irreversible.

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➽ Compounds :-

Compound are formed as a result of chemical reactions between two or more elements of compounds.

The components of a compound are always present in a definite ratio by mass.

The properties of a compound are entirely different from its constituents.

Compounds are always homogeneous in nature.

Compound formation is accompanied by absorption or evolution of light, heat or electrical energy.

Melting and boiling points of a compound are usually sharp and fixed.

The constituents of a compound can be separated by chemical methods.

➽ Mixtures :-

Mixtures are formed by simply mixing two or more constituents. There are no chemical reactions between the constituents.

The components of a mixture may be present in any ratio.

The properties of a mixture are same as those of constituents.

Mixtures are usually heterogeneous (except in solutions).

Heat, light or electrical energy may not be evolved or absorbed during the formation of a mixture.

Melting and boiling points of a mixture are usually not sharp and fixed.

The components of a mixture can be easily separated by physical methods.

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Schulz Nicolas
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