Q. 15.0( 2 Votes )

State whether the following statements are true or false. If false give the correct statement

(a) Liquids expand more than gases on heating.

(b) A compound cannot be broken into simpler substances chemically.

(c) Water has a definite boiling point and freezing point.

(d) Buttermilk is an example of heterogeneous mixture.

e) Aspirin is composed of 60% Carbon, 4.5% Hydrogen and 35.5% Oxygen by mass. Aspirin is a mixture.

Answer :

(a) False


Gases expand more than liquid on heating since they have more intermolecular space as compared to liquid so on heating the molecules in gases gets more space to increase in size as compared to molecules in liquid.


(b) False


Compound breaks down into simpler substance during chemical change such as when heat is supplied to calcium carbonate which is compound breaks down into simpler substances which are the constituents of it.



(c) False


The boiling point of water depends upon the surrounding pressure since at boiling point, vapour pressure of the gas coming out of the liquid equals the pressure on it because of environment. So as we move up, pressure drops as a result boiling point decreases similar is the case with melting point.


(d) True


Butter and milk are immiscible into one another and a layer of butter can be seen clearly at the top.


(e) False


Aspirin is composed of 60% Carbon, 4.5% Hydrogen and 35.5% Oxygen by mass. Aspirin is a compound.


Aspirin has fixed proportion of carbon, hydrogen and oxygen combined in the ratio of their mass. So it has fixed formula and hence it cannot be mixture as mixture has no formula.


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