Give reason to show that the following is a chemical change:
Burning of magnesium in air.
New substance is formed with different properties.
None of these
No new substance is formed.
The reaction is reversible.
A
None of these
B
No new substance is formed.
C
The reaction is reversible.
D
New substance is formed with different properties.
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Solution
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A chemical change is one in which the identity of the substance is altered to produce one or more new substances. Burning of anything is a chemical change as new substances are formed in the process. The reaction is irreversible.
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Similar Questions
Q1
Which of the following is true for a chemical change?
(I) New substance is formed.
(II) The change is reversible
(III) The change is permanent
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Q2
Which of the following is not a feature of chemical change?
(I) Original substance can be obtained by simple physical methods. (II) It is a temporary change. (III) The new substances formed have properties different from those of the reacting substances.
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Q3
Changes, in which new substances with different properties are formed, are called
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A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.
A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.
In a chemical change, the properties that change are :
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Q5
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