Q. Explain the following terms:
(a) Slow and fast changes,
(b) Reversible and irreversible changes and
(c) Physical and chemical changes
Answers
Answer:
Answer:
Explanation:
(a) Slow change : Blooming of flowers.
Fast change : Breaking of glass.
(b) Reversible change : Change of ice into water.
Irreversible change : Cutting of trees.
(c) Physical change : Tearing of paper.
Chemical change : Burning of paper.
Answer :-
Explain the following terms :
(a) Slow and fast changes
Ans.
Slow changes: The changes which occurs steady or slowly are called slow changes.
Fast changes: The changes which occurs rapidly are called fast changes.
Few examples,
Slow changes → Rusting of iron.
Fast change → Bursting of crackers, balloons.
(b) Reversible and irreversible changes
Ans.
Reversible changes: The changes which can come back or reverse to it's original form is called reversible changes.
Irreversible changes: The changes which cannot come back or reverse to it's original form is called irreversible changes.
Few examples,
Reversible change → Melting of ice.
Irreversible change → Ripening of fruit, cooking of vegetables.
(c) Physical and chemical changes
Ans.
Physical changes: The changes which no new substances are formed.
The main characteristics of a physical change is :
No new substances are formed.
Temporary change
Reverse to it's orginal form.
Chemical changes: The changes in which new substances are formed are called chemical change.
The main characteristics of a chemical change is :
New substances are formed.
Permanent change
Cannot reverse to it's orginal form or irreversible.
Few examples,
Physical change → Tearing of paper, breaking of glass.
Chemical change → Rusting of iron, respiration.