Advertisements
Advertisements
Question
What is inter-conversion of matter. Give the meaning of the terms involved in inter-conversion of matter
(a) Melting
(b) Vaporisation
(c) Liquefaction or condensation,
(d) Solidification or freezing
(e) Sublimation.
Solution
INTERCONVERSION OF MATTER :
“Change of state of matter from one state to another state and back to its original state is called inter-conversion of matter.”
(a) MELTING: Conversion of a solid into a liquid on heating e.g. ice to water.
(b) VAPORISATION: Conversion of a – liquid into vapours (or gas) on heating e.g. water to water vapour.
(c) LIQUEFACTION or CONDENSATION: Conversion of VAPOUR (or gas) into a LIQUID on cooling e.g. water vapour to water.
(d) SOLIDIFICATION OR FREEZING: Conversion of a LIQUID into a SOLID e.g. water to ice.
(e) SUBLIMATION: Conversion of a SOLID directly in GASEOUS (vapour) state and on cooling directly back to SOLID e.g. Naphthalene sublimes at room temperature.
APPEARS IN
RELATED QUESTIONS
A few substances are arranged in the increasing order of 'forces of attraction' between their particles. Which one of the following represents the correct arrangement?
Fill in the following blank with suitable words :
Scientists say that there are actually five states of matter : solid, liquid, gas, .................... and ...................
Explain why, naphthalene balls kept in stored clothes in our homes disappear over a period of time.
Match the following:
| Column A | Column B |
| (a) Evaporation of water | (i) Non-periodic change |
| (b) Milk turning sour | (ii) Periodic change |
| (c) Earthquake | (iii) Chemical change |
| (d) Change of seasons | (iv) Physical change |
| (e) Glowing of bulb | (v) Reversible change |
Define the following terms: Condensation
Name the phenomenon which causes the following changes:
Conversion of ice into water
State which of the following statement is true or false. If false write the correct statement.
Atoms/molecules in gases move only about their own positions.
Why does this happen?
Coconut oil thickens in winter.
Why does this happen?
Kerosene left open in a dish disappears.
Fill in the blank with the appropriate word of the statement given below:
Change of milk of curd is a _______ change.
