1. Define the following terms.
(a) Reversible change
(b) Chemical change
(c) Physical change
Answers
Answer:
• All these are changes occurs in the substance during various different chemical or physical changes.
Explanation:
• Reversible changes : The type of changes that occur in substances which can be converted back to its former or initial stage is called as reversible change.
• Example : The conversion ice in liquid water, or water back to ice by the process of melting and freezing respectively.
• This undergoes only physical changes and not chemical changes and no new substances are formed in this changes.
• Chemical changes : The type of changes in which the substances undergoes change in their chemical composition and new substances are formed.
• New substances are formed in this type of changes, and the original composition of the substance also changes.
• Example: any type of reaction like the burning of coal, or mixing of water with acids, etc.
• Physical changes : In this type of changes only the state of substances are changed.
• No new substances are formed during this change.
• They are generally reversible in nature.
• Example : conversion of water to ice and vapour, etc.
Answer:-
(a) Reversible change is that change that can be reversed by one or more methods.
(b) A chemical change can be defined as a chemical reaction in which one or more substances undergo changes to form new substances or a new structure.
(c) A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another.
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