'A substance has a definite shape as well as a definite volume'. Which physical state is represented by this statement?

Academic Chemistry NCERT Class 9

Solids are substances that have a definite shape and a definite volume.

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Updated on: 10-Oct-2022

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'A substance has definite volume but no definite shape'. State whether this substance is a solid, a liquid or a gas.
A substance has neither a fixed shape nor a fixed volume. State whether it is a solid, a liquid, or a gas.
The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.(a) Name the substances (i) X (ii) Y and (iii) Z.(b) What is the process of conversion of X into Y known as?(c) At which temperature X gets converted into Y?(d) What is the process of conversion of X into Z known as?(e) At which temperature X gets converted into Z?
The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.(a) Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E(b) Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as?(c) Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.(d) Name the most common substance belonging to state A.(e) Which state of matter makes the sun and other stars to glow?
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