Question

Differentiate between :-

1. Physical change and Chemical change.
2. Compound and Mixtures.

Answer 1

Answer:

1) ●A chemical change is a permanent change. 

●A Physical change affects only physical properties i.e. shape, size, etc.

●Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.

● A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

2) ●Compound are substances which can be formed by chemically combining two or more elements.

● Mixtures are substances that are formed by physically mixing two or more substances. Compounds can be of three types, which are: covalent compounds, metallic compounds and ionic compounds.

Explanation:

Hope it helps.

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Answer 2

Explanation:

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➤ Differentiate between :-

• Physical change and Chemical change.
• Compound and Mixtures.

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➽ 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.