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प्रश्न
Define 'melting point' of a substance ? What is the melting point of ice
उत्तर
Melting point: the melting point of a substance is defined as the temperature at which a solid substance melts into a liquid at atmospheric pressure. The melting point of ice is 0°C.
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
heating of water —
Fill in the following blank with suitable words :
When steam condenses to form water, heat is .......................
How is ammonia gas liquefied ?
Define Intermodular force of attraction
Write whether the following statement is true or false:
A gas has no free surface.
Name the phenomenon which causes the following changes:
Disappearance of camphor when exposed to air
Give two examples of the following:
Substances which are rigid and not compressible
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.
State if the following is a physical property of a substance.
Water acidified with dilute sulphuric acid is a good conductor of electricity.
State which of the three states of matter Le. solids, liquids or gases – have
(a) No definite volume
(b) A definite shape
(c) High density
(d) No free surfaces
(e) Particles – which diffuse very easily.
