difference between
burning and rusting
physical change and chemical change
Answers
Rusting:
- Rusting is the process of formation of iron oxide or red oxide formed on surface of iron and its alloys when exposed to “air and moisture”.
- It requires both oxygen and moisture.
- It is a gradual process.
- Rusting occurs at low temperatures.
- Rusting takes place only in iron and its alloys.
- Rusting results in the reddish coating on the surface due to red or iron oxide formation.
Burning:
- Burning is a process where a substance reacts with the oxygen with the release of “heat and light”.
- It requires only oxygen, moisture is not required.
- It is rapid process
- It needs high temperature
- Burning takes place in fuel, rubber, paper, and many more substances.
- Burning results in black soot and smoke particles.
Physical change:
1) The chemical composition of a substance does not change in
physical change.
2) Most changes are reversible in Physical change.
3) No new substances are formed in Physical Change. For example,
Ice → Water → Steam
Chemical change:
1) The chemical composition of a substance does change in chemical
change.
2) Most changes are irreversible in Chemical Change.
3) New substances are formed in Chemical Change. For example,
Paper → Ashes
Answer: Some instance of physical alteration are freezing of water, melting of wax, boiling of water, etc. A few instances of chemical alteration are digestion of food, burning of coal, rusting, etc. ... Chemical change is irreversible i.e. original material cannot be recovered.
Explanation: