Chemistry! ! ! 1. organic functional a. give characteristic properties to compounds that contain them. b. always contain oxygen. c. always contain a double or triple bond. d. are present in every organic compound. 2. which of the following statements about denaturing is true? a. denaturing occurs when a protein unfolds. b. denaturing occurs when a carbohydrate is heated. c. denaturing does not affect the tertiary structure of an enzyme. d. denaturing increases the rate of a chemical reaction. 3. which of the following solutions would have a ph value greater than 7? a. [oh-] = 2.4 × 10^-2 m b. [h3o+] =1.53 × 10^-2 m c. 0.0001 m hcl d. [oh^-] = 4.4 × 10^-9 m

1. Functional groups

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.

2. Denaturing

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.

3. Identifying basic solutions

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.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante