Advertisements
Advertisements
Question
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Advertisements
Solution
chemical change.
APPEARS IN
RELATED QUESTIONS
A physical change is temporary. Explain.
State the various conditions that favour the process of evaporation.
Solve this crossword by using the clues that follow.

Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
State four differences between physical and chemical changes.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
What is the difference between dissolution of sugar and burning of sugar ?
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
