Advertisements
Advertisements
प्रश्न
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
पर्याय
physical
chemical
Advertisements
उत्तर
A change in which matter undergoes a change but the total mass of the substance is unaltered is a physical change.
APPEARS IN
संबंधित प्रश्न
State whether the following is physical or chemical changes.
water cycle in nature —
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Write true or false
Burning of paper and formation of curd are reversible changes.
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Classify the following as physical or chemical change :
Formation of curd from milk
Given reason:
Burning of paper is a chemical change.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
Keeping a stone in sunlight for few hours is ______.
