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Question
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.
- Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
- Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
- Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
- Name the most common substance belonging to state A.
- Which state of matter makes the sun and other stars to glow ?
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Solution
- The physical states are
- A-liquid
- B-gas
- C-solid
- D-plasma and
- E-Bose-Einstein condensate (BEC).
- Ammonium chloride; and the name of the process is sublimation.
- Carbon dioxide
- Water
- Plasma is the state of matter that allows the sun and the other stars to glow.
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