Advertisements
Advertisements
प्रश्न
Differentiate between melting point and boiling point, giving atleast one example of each.
Advertisements
उत्तर
MELTING POINT:
The temperature at which a solid starts changing into LIQUID without further increase in temperature is called MELTING POINT.” Or The constant temperature at which solid changes into liquid.”
Example: Ice (solid) melts at 0°C into water (liquid) when heated.
BOILING POINT :
“The temperature at which a LIQUID start changing in vapour without a further rise in temperature.
Or
‘The constant temperature at which a LIQUID starts changing into GAS (vapours)
Example: Boiling point of water (liquid) is 100°C.
APPEARS IN
संबंधित प्रश्न
Explain the term vaporization.
Explain the terms boiling point.
A liquid can change into vapour state at a fixed temperature.
A certain quantity of water is heated from 20°C to 100°C. Its temperature is recorded after each 1 minute. The observations are:
| Time (in minute) | Temperature (in °C) |
| 0 | 20 |
| 1 | 30 |
| 2 | 40 |
| 3 | 50 |
| 4 | 60 |
| 5 | 70 |
| 6 | 80 |
| 7 | 90 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
Assertion: The process of conversion of liquid water to its vapours by heating the liquid is called boiling.
Reason: The process of conversion of water vapours to liquid by cooling the vapours is called condensation.
Choose the correct statement of the following
Evaporation of a liquid at room temperature leads to a ____________ effect.
The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ____________.
Assertion (A): Burning of a candle is considered a physical as well as chemical change.
Reason (R): Melting of wax is a physical change melted wax turns into vapours and then bums which is a chemical change.
Assertion (A): No-new substance is formed when water is heated to get steam.
Reason (R): Conversion of water into steam is a physical change.
