Melting
Trending Questions
The temperature at which a solid gets converted into its liquid state is called its :
melting point
freezing point
dew point
boiling point
Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.
Melting of ice into water is a
When a solid is heated, what happens to its molecule?
Sublimation
Boiling
Melting
Evaporation
Explain the terms melting and melting point.
Why is ice at 273K more effective in cooling than water at the same temperature. [ 3 MARKS ]
Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings.
State
(a) the melting point of ice and (b) the boiling point of water.
Adding sugar to water is a
When water is frozen, it forms ice that has different properties. Why then do we say that freezing is a physical change?
Tearing a piece of paper is a __________ change.
Fill in the blanks:
Ice, water and water vapour look different_____ properties but they are _____ the same.
1. How does a blacksmith change iron into different tools? What type of change occur in iron?
Which of the following changes represent the process of sublimation.
Solid⇢Liquid
Liquid ⇢ Solid
Solid ⇢ Gas
Gas ⇢ Liquid
- Evaporation
- Melting
- Freezing
- Condensation
In a physical change, the chemical composition of the original substance is altered.
- True
- False
How will you justify that ice, water, and steam are not different substances, but different states of the same substance?
Write “P” for physical change and “C” for chemical change in the following:
(a) Dissolving salt in water
(b) Freezing of water.
(c) Rusting of iron.
(d) Frying an egg.
(e) Heating ice to form water.
(f) Digestion of food.
- Gold
- Oil
- Water
- Air
b. Which glass is not corroded by the acids and alkalis?
- Solid
- Gas
- Liquid
- Melting
- Boiling
- Condensation
- Solidification
Freezing
Boiling
Evaporation
Melting
- Juice
- Water
- Rock
- Oxygen
- Juice
- Oxygen
- Water
- Rock
- 50
- 4
- 0
- 100
B. Statements given below are incorrect. Write the correct statements:
1. A physical change cannot be reversed.
Name the process in which a solid changes to liquid.
- solid, gas and liquid
- solid, liquid and gas
- liquid, solid and gas
- solid, liquid and liquid