Download App

Science Distinguish between

Changes – Physical and Chemical · Maharashtra Board STD 7 (MSBSHSE - Semi English Medium). 4 questions.

Questions

Distinguish between

Take a timed test

4 questions · self-marked practice — reveal the answer and mark yourself.

Question 14 Marks
Reversible change and Irreversible change
Answer
Reversible changeIrreversible change
1. The changes that can occur in a forward and reverse direction again and again is called reversible.1. The changes which we can not reverse back to some thing are called irreversible change.
2. E.g.: (a) Melting a wax candle and obtaining the original solid wax again, (b) Stretching a rubber or spring.2. E.g.: Burning of paper or wood cannot be undone. Wood cannot be obtained from the ash.
View full question & answer→
Question 24 Marks
Natural change and Man-made change
Answer
Natural changeMan-made change
1. Changes that occur naturally on its own are called natural changes.1. Changes that are result of human activity. Such changes are called man-made.
2. Examples ripening of a fruit, spoiling of milk, change in the climate2. Burning of fossil fuels, deforestation, pollution of air, water and soil.
View full question & answer→
Question 34 Marks
Periodic changes and Non-periodic change
Answer
Periodic changesNon-periodic change
1. Some changes occur again and again after a definite interval of time. Such changes are called periodic changes.1. In this, certain changes will recur after one occurrence, it cannot be said for sure, even if they occur interval is not fixed. Such changes are called non-periodic changes.
2. Examples: movement of clock hands in clock showing time, change of season, day and night formation, heart beat, ripening of fruit, rising and setting of the sun.2. Examples: volcanic eruption, occurrence of an earthquake, tsunami, forest fires, freezing of water to form ice, sneezing, rusting of iron.
3. They repeat themselves after a fixed interval of time.3. They do not repeat themselves after a fixed interval of time.
View full question & answer→
Question 44 Marks
Physical change and Chemical change
Answer
Physical changesChemical changes
1. In a physical change material may change its1. A change which after physical properties and
shape, size, texture or state.composition also.
2. No new compound is formed.2. New compound /substance is formed due to chemical change.
3. The change is temporary. It is reversible.3. The change is permanent and irreversible.
View full question & answer→
Generate Paper FreeAll Changes – Physical and Chemical topics