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प्रश्न
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
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उत्तर
Magnesium is heated producing a bright light to form MgO in the air is a chemical change as the composition changes (MgO white powder) is formed, is irreversible. We cannot get magnesium back from MgO.
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संबंधित प्रश्न
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
Fill in the blank.
A new substance is formed in a ............... change.
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Tick the most appropriate answer.
Physical changes are
Classify the following as a physical or a chemical change.
Boiling of water
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
What will you take into account while identifying the following?
A chemical change in a substance.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Select the chemical changes from the following list of changes
Respiration in mammals.
