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प्रश्न
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
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उत्तर
CO2 carbon dioxide.
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संबंधित प्रश्न
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Natural and man-made change.
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
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.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Grinding of wheat grain changes its size. It is a ____________ change.
Mention a few physical properties of a substance.
