Question

1. 1. a chemist performs the same test on two solids, a & b. the results are shown in the table. these results would suggest that ___.

solid a solid b
melting point high, 801°c low, evaporates at 186°c
solubility in h₂o (grams per 100 g h₂o at 0°c) 35.7 3.2
electrical conductivity (in aqueous solution) good conductor nonconductor
solid a contains covalent bonds and solid b contains ionic bonds.
both solids contain only covalent bonds.
both solids contain only ionic bonds.
solid a contains ionic bonds and solid b contains covalent bonds.

Explanation:

Step1: Analyze melting point

Ionic compounds have high melting points (Solid A: \(801^{\circ}C\)), covalent compounds have low melting points (Solid B: \(186^{\circ}C\)).

Step2: Analyze solubility

Many ionic compounds are soluble in water (Solid A: \(35.7\) grams per \(100\) g \(H_2O\) at \(0^{\circ}C\)), some covalent compounds have low solubility (Solid B: \(3.2\) grams per \(100\) g \(H_2O\) at \(0^{\circ}C\)).

Step3: Analyze electrical conductivity

Ionic compounds (in aqueous solution) are good conductors (Solid A), covalent compounds (except some acids) are non - conductors (Solid B).

Answer:

Solid A contains ionic bonds and Solid B contains covalent bonds.