Advertisements
Advertisements
प्रश्न
Classify the following changes as physical or chemical.
Advertisements
उत्तर
- boiling — Physical
- curdling of milk — Chemical
- photosynthesis in plants — Chemical
- melting of a solid (wax) — Physical
APPEARS IN
संबंधित प्रश्न
Chemical changes are accompanied by changes in energy.
What role does energy play in initiating a chemical change ?
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Classify the following as physical or chemical change :
Condensation of steam
Classify the following as physical or chemical change :
Growth of a plant
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
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.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
Distinguish physical and chemical changes.
