1. <em>Functional groups
</em>
Answer:
a. Give characteristic properties to compounds that contain them.
Explanation:
a. is correct. This is what functional groups do: they change the chemical and physical properties of a compound.
b. is <em>wrong</em>. For example, CN and SH are functional groups that contain no oxygen.
c. is <em>wrong</em>. For example, OH and SH contain no double or triple bonds.
d. is <em>wrong</em>. There are no functional groups in alkanes.
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2. <em>Denaturing
</em>
Answer:
a. Denaturing occurs when a protein unfolds.
Explanation:
Denaturing involves the breaking of the attractive forces that hold the protein in its characteristic shape.
With these bonds broken, the protein structure unfolds.
b. is<em> wrong</em>. Denaturing is the term applied only to proteins
c. is <em>wrong</em>. Denaturing destroys the 3D structure of an enzyme.
d. is <em>wrong</em>. Denaturing an enzyme destroys the catalytic action of an enzyme. Denaturing <em>decreases</em> the rate of an enzyme-catalysed reaction.
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3. <em>Identifying basic solutions
</em>
Answer:
a. [OH⁻] = 2.4 × 10⁻² mol·L⁻¹
Explanation:
To be basic, a solution must have [OH⁻] > 1 × 10⁻⁷ mol·L⁻¹ or
[H₃O⁺] < 1 × 10⁻⁷ mol·L⁻¹.
a. is correct, because [OH⁻] > 1 × 10⁻⁷ mol·L⁻¹
b. is <em>wrong,</em> because [H₃O⁺] > 1 × 10⁻⁷ mol·L⁻¹.
c. is <em>wrong</em>, because [H₃O⁺] > 1 × 10⁻⁷ mol·L⁻¹. The solution is <em>acidic</em>.
d. is <em>wron</em>g. [OH⁻] < 1 × 10⁻⁷ mol·L⁻¹. The solution is<em> acidic.</em>