(a)
Interpretation:
Whether a pure substance is an electrolyte or a nonelectrolyte should be determined experimentally.
Concept introduction:
A substance that has a fixed chemical composition through a cell is called pure substance.
(b)
Interpretation:
The cause for a cold glass of beer to go“flat” upon warming is to be determined.
Concept introduction:
Two gases (nitrogen and carbon dioxide) are basically used to make beer. As the temperature increases solubility of the gas also decreases.
(c)
Interpretation:
The cause for the molality of a soluteto be ordinarily larger than its mole fraction is to be determined.
Concept introduction:
Molality is a concentration unit based on number of moles of solute divided by kilogram of solvent.
(d)
Interpretation:
The cause for the boiling point to raise in the presence of a solute is to be determined.
Concept introduction:
Temperature at which the vapor strain of liquid equal to environmental pressure surrounded by liquid is known as boiling point.
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