Advertisements
Advertisements
Question
Sublimation is classified as a physical change. Why ?
Advertisements
Solution
Physical changes are those in which no new substance is formed. In sublimation there is direct conversion of solid into gas and vice versa. Thus the substance remains the same.
APPEARS IN
RELATED QUESTIONS
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Give four difference between physical and chemical changes.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
Digestion of food is a physical change.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
Which of the following is a physical change?
Keeping a stone in sunlight for few hours is ______.
