Question

D Four Differentiate between the following.
1. Physical and chemical changes
2. Periodic and non-periodic changes​

Answer 1

Answer:

1.When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances. ... A chemical change is a permanent change.

Explanation:

2.Difference between the periodic motion and non-periodic motions. A motion repeating itself at regular intervals is regarded as periodic motion. A motion that repeats itself is considered a non-periodic motion but not at regular periods of time.

Answer 2

Answer:

Physical Changes :-

1). When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.

2) Physical change is a temporary change.

3) A physical change involves very little to no absorption of energy.

4) Generally, physical changes do not involve the production of energy.

Chemical Changes :-

1) When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.

2) A chemical change is a permanent change.

3) During a chemical reaction, absorption and evolution of energy take place.

4) Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)

Periodic Changes :-

Changes which are repeated after regular intervals are called periodic changes. The occurrence of day and night and even the change of periods in your school are examples of periodic changes.

Non Periodic Changes :-

Changes which do not take place periodically, such as freezing of water to form ice, are non-periodic changes.

Changes which do not repeat themselves at regular intervals are called non-periodic changes.

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