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Question
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
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Solution
Glowing of an electric bulb is a PHYSICAL change as no change in the composition of filament takes place is reversible, the only filament glows when electricity is passed and returns to its original form on switching off the electric current.
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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.
Classify the following as chemical or physical change:
Dissolving common salt in water.
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
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
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
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.
Is a change of state of matter – a physical or a chemical change. Give reasons.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
Select the chemical changes from the following list of changes
Drying of a fruit
Select the chemical changes from the following list of changes
Breaking of glass
