Question

State :
(a) Three differences between water and air
(b) Four differences between compound and mixtures





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Answer 1

Answer:

A)Difference between Air and Water:-

i)Water Is Liquid Whereas Air Is A gas

ii)Water Has Fixed Volume While Air Has No Fixed Volume

iii)Water Is A Compound Whereas Air Is A Mixture

B)Difference Between Mixture and Compound:-

i)Mixture can Be separated By Usual Physical Methods While Compund Can Only By Chemical Methods

ii)Components Of Mixture Is Constituted In Fixed Ratio While Components Of Compound are constituted in fixed ratio

iii)Mixture Show The Properties Of Their Components While Compound Do not Show The Properties Of their Components

iv)In a Mixture elements don't react to form new substance while in Compound Elements React to form New Substance

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Answer 2

Answer:

a. differences between water and air

Water :

1.The components of water are hydrogen and oxygen which are chemically combined in a fixed ratio of 1 : 8 by mass.

2.The chemical composition of water remains same from whatever source it is obtained.

3.The properties of water are completely different from the properties of elements from which it is formed i.e. hydrogen and oxygen.

4.Energy change occurs in the formation of water.

5.A molecule of water is represented by a definite formula H2O.

Air :

1.The main components of air are nitrogen, oxygen, carbon -dioxide, water vapour which are not chemically combined.

2.The composition of air varies from place to place. During rainy season the air becomes humid due to presence of more water vapour. Some impurities like sulphur dioxide, hydrogen sulphide etc. also changes its composition at some places.

3.The components of air retain their individual properties but not air.

4.No energy change occurs when components of air are mixed together.

5.Air cannot be represented by any chemical formula.

b. differences between compound and mixtures

1.Mixtures are the impure substances, made up of two or more physically mixed substances and not in the fixed ratio. Compounds are the pure form, made up of two or more chemically mixed elements and in a fixed ratio.

2.Mixtures can be homogenous or heterogeneous in nature, but compounds are generally homogenous.

3.As said earlier the composition of the substances found in the mixtures are not in fixed quantity, that means their ratio varies, but in the case of compounds the elements are present in fixed quantity, that means their ratio is fixed. Due to this the compound can be named and have certain chemical formula like Sodium Chloride (NaCl), Baking soda, Methane, Salt, etc., but this is not same for the mixtures.

4.As the ratio of the substances present in a mixture is not fixed and so their properties also vary (not fixed) as it depends on the type of substances and the quantity of the elements which are being mixed, whether it is a chemical or physical property. In compounds, new properties (physical and chemical) are retained after the formation of the new compound, and we know the quantity or ratio of the elements present in the compound.

5.Separation of the substances present in mixtures is easy by different physical methods such as filtration, chromatography, evaporation, while in case of compounds the substances are not easy to separate and if done than it is by chemical methods.

6.No new substances are formed from the mixtures, due to the unchangeable properties of its constituents, while there is always formation of the new substances, due to the mixing of the chemical properties of the different constituents.

7.There is no heat change or involvement of energy is observed when mixtures are made, but the formation of compound results in heat change as energy is used or evolved in reaction. Mixtures do not have meting or boiling point, but compounds have fixed melting and boiling point.

8.Examples of mixtures are Alloys like brass, bismuth, chromium, oceanic water (salt and water), mixtures of gases, etc., while Sodium Chloride, Baking soda, Methane, Salt, etc., are the examples of the compounds.

Explanation:

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