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Question
What will you take into account while identifying the following?
A chemical change in a substance.
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Solution
Chemical changes are changes that involve the reaction of substances with one another. Such reactions result in alterations in the chemical compositions of the substances involved. These changes lead to the formation of new substances.
Characteristics:
- One or more new substances are formed during a chemical change.
- Most chemical changes cannot be reversed easily.
- The chemical composition of a substance undergoing chemical change does not remain the same.
- A chemical change is always accompanied by a change in energy.
RELATED QUESTIONS
Changes in which only ______ properties of a substance change are called physical changes.
Classify the following changes as physical or chemical:-boiling
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Gas exists in three states as solid, liquid, and gas.
Adding sugar to milk is a physical change.
Explain the characteristics of physical change with examples.
