1. Functional groups
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 wrong. For example, CN and SH are functional groups that contain no oxygen.
c. is wrong. For example, OH and SH contain no double or triple bonds.
d. is wrong. There are no functional groups in alkanes.
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2. Denaturing
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 wrong. Denaturing is the term applied only to proteins
c. is wrong. Denaturing destroys the 3D structure of an enzyme.
d. is wrong. Denaturing an enzyme destroys the catalytic action of an enzyme. Denaturing decreases the rate of an enzyme-catalysed reaction.
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3. Identifying basic solutions
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 wrong, because [H₃O⁺] > 1 × 10⁻⁷ mol·L⁻¹.
c. is wrong, because [H₃O⁺] > 1 × 10⁻⁷ mol·L⁻¹. The solution is acidic.
d. is wrong. [OH⁻] < 1 × 10⁻⁷ mol·L⁻¹. The solution is acidic.
I believe the answers of the following are right;
1. a
2. a
3. a
