Try Out
Name any three desirable changes from our daily life.
in which change does the temperature of the surroundings
rise-- endothermic or exothermic?
How is a reversible change different from an irreversible change?
Explain with an example.
Fill in the blanks.
a. The temperature of the surroundings rise in an
change.
b. An example of an irreversible change in which no new substance
is formed is
C. An example of a reversible change is
Answers
Answer:
The changes that we want to take place are desirable changes.
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Examples:
Souring of milk.
Rusting of iron.
Rotting of fruits & vegetables.
Global warming.
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”
A change which cannot happen backward, that is, it cannot be reversed is called an irreversible change.
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Difference between reversible changes and irreversible changes.
Reversible changes Irreversible changes
Most physical changes are reversible changes. All chemical changes are irreversible changes
exothermic reaction
When a chemical reaction happens, energy is transferred to or from the surroundings. When energy is transferred to the surroundings, this is called an exothermic reaction, and the temperature of the surroundings increases.
The tearing of paper is an irreversible change as we cannot get back the original sheet of paper from the pieces. However, there are no new substances created by tearing paper. The pieces of paper obtained have the same molecules as the original sheet of paper.
Reversible changes
A reversible change might change how a material looks or feels, but it doesn't create new materials. Examples of reversible reactions include dissolving, evaporation, melting and freezing.