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Interpretation:
The result of a chemical change and its four indicators needs to be explained.
Concept introduction:
In a chemical change, the new substance is formed. The composition of new substance is different from the original substance. The chemical change is irreversible.
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Answer to Problem 12SSC
The formation of new substance and different ratio of elements are the resultant of a chemical change.
There are four indicators of a chemical change.
- Production of gas.
- Releasing energy or gain of energy.
- Color change.
- Formation of precipitation.
Explanation of Solution
A chemical property describes how a substance reacts with other substances. In a chemical change, a new substance is formed and absorption of energy or loss of energy occurs; it is an irreversible change. For example, rusting, dissolving, etc.
The main four indicators with example are as follows-
- Production of gas (Sodium ignites when reacting with water, hydroxide is formed and hydrogen gas released.)
- Releasing of energy or gain of energy (Burning of wood, is the example where the heat loss by the production of ash and gases)
- Color change (The color changes when leaves fall).
- Irreversible change (Iron rusting, when the iron reacts with moisture an oxide of iron is formed which cannot be converted into iron).
Required indicators are mentioned below:
- Production of gas
- Releasing of energy or gain of energy
- Color change
- Irreversible change
Chapter 3 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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