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Question
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Solution
A change, which alters the composition of a substances,iis known as a chemical change.
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RELATED QUESTIONS
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 ?
Fill in the blank
Revolution of the earth around the sun is a ________ change.
State whether the following is physical or chemical changes.
lightning —
True or false
Is the process of digestion a physical change?
State the various conditions that favour the process of evaporation.
Define a chemical change. Give two examples of the above changes.
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.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
