Page 69 - ICSE Chemistry 6
P. 69
Take a Break!
Write/Choose the correct answer.
1. The intermolecular force and the intermolecular space are responsible for determining the mass of
ma er. (True/False)
2. The molecules in __________ only vibrate about their fi xed posi ons.
3. Liquids are free fl owing because the molecules are __________ packed.
4. Gases do not have a defi nite __________ and __________.
5. The intermolecular forces between the molecules of a solid are very strong. (True/False)
6. A change of state from a gas to a solid is called __________.
7. All the three states of ma er __________ on hea ng.
8. A __________ change involves the forma on of new substances.
Terms to Know
Ma er: Anything that has mass and occupies space
Mass: The measure of quan ty of ma er contained in a substance
Intermolecular space: The space between molecules of a substance
Intermolecular force: The force with which molecules a ract each other
Diff usion: The phenomenon of intermingling of substances by the natural movement of their
par cles
Mel ng: The process of conversion of a solid into a liquid
Mel ng point: The constant temperature at which a solid changes into a liquid
Freezing: The process of conversion of a liquid into a solid
Freezing point: The constant temperature at which a liquid changes into a solid
Vaporiza on: The process in which a liquid changes into gaseous or vapour state
Evapora on: The process in which a liquid gains heat energy from its surroundings and changes into
vapour state
Boiling: The process of change of a liquid into vapour state on hea ng
Boiling point: The constant temperature at which a liquid changes into vapour state
Condensa on: The process of conversion of a gas into a liquid
Condensa on point: The constant temperature at which a gas changes into a liquid
Sublima on: The process of conversion of a solid into a gas
Sublimate: The solid obtained on cooling the vapour
Sublime: The gaseous state of a solid
Chemical change: A permanent change in which new substances are formed
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