Advertisements
Advertisements
Question
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
Advertisements
Solution
When a candle burns, wax melts. Melting of wax is a physical change.
APPEARS IN
RELATED QUESTIONS
Classify the following as chemical or physical change:
Cutting of trees
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 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 formade | e. irreversible change |
| f. slow change |
Write short answer.
What are man-made changes ?
State whether the following is physical or chemical change.
Digestion of food —
Write true or false
Burning of paper and formation of curd are reversible changes.
Classify the following as a physical or a chemical change.
Butter getting rancid
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
