Advertisements
Advertisements
प्रश्न
What is the difference between dissolution of sugar and burning of sugar ?
Advertisements
उत्तर
1. Dissolution of sugar:
- When sugar is dissolved in water it disappears. It we taste the solution, the sugar is still present in dissolved form.
- If water is evaporated we get back the sugar.
- So it is a physical and reversible change.
2. Burning of sugar:
- Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar as the chemical bonds broke.
- Energy is released in the form of smoke.
- So, burning a sugar is a chemical change.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Revolution of the earth around the sun is a ________ change.
State whether the following is physical or chemical changes.
water cycle in nature —
True or false
Is melting of ice a reversible change?
Write true or false
Deforestation is a man-made change.
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Compare the energy changes involved during a physical and 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 |
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
What kind of change is shown by tearing of paper?
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
