Concept explainers
(a)
Interpretation:
A balloon is filled with helium at a temperature of
(b)
Interpretation:
A balloon is filled with helium at a temperature of
(c)
Interpretation:
If the balloon is heated, the change that is observed has to be given.
(d)
Interpretation:
If the balloon is cooled, the change that is observed has to be given.
(e)
Interpretation:
Helium is a pure substance or a mixture has to be given.
Concept Introduction:
Pure substance:
It consists of only one component. Water is a pure substance, which consists of hydrogen and oxygen atoms.
Mixture:
It is a combination of two or more pure substances in which each substance retains its own identity.
(f)
Interpretation:
Helium is an element or compound has to be given.
Concept Introduction:
Element:
It is a pure substance which cannot be changed into simple forms.
Compound:
It is formed by the combination of two or more elements in a reproducible way.
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