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Answers
Answer:
1. physical change is a change in the outer appearance of any substance for example when gold is melted only the goal changes its stake for which is a which means of that's gold from solid turns into liquid but the liquid composition does not changes or the chemical composition does not change. 2. chemical change is a change in the chemical composition of the substances which means for example if gold is changed into would then there should be some chemical reaction which should take place that will ionize the reactions.
Explanation:
3.There are many differences between physical and chemical changes and it is important to understand them to be able to understand these concepts clearly. The comparisons and differences between physical and chemical changes are given below along with their examples. To understand physical and chemical properties and changes better, it is important to know what they are. Visit physical and chemical changes to know more about them in detail. In this article, the differences between physical changes and chemical changes are provided in a tabular format.
Differences Between Physical and Chemical Change
Physical Change Chemical Change
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.
Physical change is a temporary change. A chemical change is a permanent change.
A Physical change affects only physical properties i.e. shape, size, etc. Chemical change both physical and chemical properties of the substance including its composition
A physical change involves very little to no absorption of energy. During a chemical reaction, absorption and evolution of energy take place.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.
Generally, physical changes do not involve the production of energy. Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)
In a physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance(s).
Physical change is easily reversible i.e original substance can be recovered.
4. physical change for rusting of iron, chemical changes for burning of crackers, digestion of food is a chemical change