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Question
Classify the following as a physical or a chemical change.
Burning of coal
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Solution
Chemical change
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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 whether the following is physical or chemical changes.
glowing of a bulb -
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical change.
Digestion of food —
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
Compare the energy changes involved during a physical and a chemical change.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
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.
Explain the characteristics of physical change with examples.
