(a)
Interpretation:
Hot tea has to be classified as a compound or an element.
Concept Introduction:
Pure substance: A single component that has a constant composition, irrespective of the
Example: Water, sugar etc.
A pure substance can be classified into an element and a compound.
Element: A pure substance, which cannot be broken down into smaller substances by a
Example: Hydrogen gas, Magnesium ribbon and copper wire etc.
Compound: A pure substance that is formed by combination of two or more elements by chemical process is called as a compound. Example: Sodium chloride is a compound because it is formed from elements sodium and chlorine.
(b)
Interpretation:
Beach sand has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
Carbon dioxide has to be classified as a compound or an element.
Concept Introduction:
Refer to part (a).
(d)
Interpretation:
Cement has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
(e)
Interpretation:
Zinc has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
(f)
Interpretation:
Vinegar has to be classified as an element or a compound.
Concept Introduction:
Refer to part (a).
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EBK FOUNDATIONS OF COLLEGE CHEMISTRY
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