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Standard VI
Chemistry
Respiration
Question

Respiration is a chemical change because:
  1. new substances are formed.
  2. change in mass.
  3. Both a and b
  4. change is temporary.

A
change is temporary.
B
new substances are formed.
C
change in mass.
D
Both a and b
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Solution
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Respiration is a chemical change as new substances like carbon dioxide and water are formed. Also there is change in the mass as glucose is oxidised by oxygen and heat is released. This change is permanent. All these factors conclude that respiration is a chemical change.

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Similar Questions
Q1
Sate which of the following pertains to- chemical changes.
a] substance retains its identity
b] The change is permanent
c] No new substance is formed.
d] is easily reversible
e] Produces one or more new substance in its composition.
f] The change is temporary
g] The composition and properties of the original substance are not altered.
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Q2
New substances are formed by
(a) physical change
(b) chemical change
(c) both of these
(d) none of these
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Q3
Respiration is a chemical change because:
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Q4
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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Q5
Matter undergoes a change. The changes are of two types: Physical and chemical change.
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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