1. The aqueous solution with the highest pH is: Select one: a. 0.1 M HCl. c. 0.1

Question

1. The aqueous solution with the highest pH is:

Select one:

a. 0.1 M HCl.

c. 0.1 M formic acid (pKa = 3.75).

d. 0.1 M NaOH.

2. The variable component of the Henderson-Hasselbalch equation relates the pH of a solution to:

Select one:

a. The equilibrium constant of the weak acid.

b. The inverse of the pOH.

c. The log ratio of [dissociated form]/[acid].

3.The bonding geometry of oxygen is determined by-

Select one:

b. SP3 hybridization of the orbitals

c. The state in which the atoms are in (liquid, gas, etc)

d. All of the above

4. Including the non-bonding orbitals, the molecular geometry of ammonia is-

Select one:

a. tetrahedral

c. trigonal planar

d. trigonal bipyramidal

e. linear

5.The greatest buffering capacity of weak acids is when-

Select one:

b. They are almost completely undissociated

c. The ratio between [A-] and [HA] is very high

d. [A-] and [HA] are nearly equal

e. None of the answers is correct

6.For any weak acid is titered with half molar equivalents of a strong base, the resulting pH would be-

Select one:

a. 0.5

b. Ka

c. -log Ka

d. -log [A-]

7.Which of the following groups can be involved in hydrophobic interactions?

Select one:

b. -Carboxyl

c. -hydroxyl

d. -aldehyde

e. None of the above

8.The dominant forces that hold pure solutions of non-polar compounds are ____________, and the bonds holding together non-polar compounds that are immersed in aqueous solution are _________.

Select one:

a. dispersion;hydrogen bonds

b. hydrogen bonds;dispersion

d. dispersion;hydrophobic

9.Which of the following are TRUE about the pH changes?

Select one:

a. A pH change from 3.0 to 5.0 reflects a decrease in the proton concentration ([H+]) by a factor of 100.

b. A pH change from 5.0 to 3.0 reflects an increase in the H+ ion concentration of 25 percent.

c. A pH change from 5.0 to 3.0 reflects a decrease in the H+ ion concentration of 25 percent.

d. A pH change from 3.0 to 5.0 reflects a greater proportional increase in the H+ ion concentration than a pH change from 5.0 to 7.0

f. (b) and (d) are correct

10.In a hydrogen bond, what is required from the donor, acceptor, and the hydrogen atom?

Select one:

a. That they will all be on a straight line for maximal bond strength

b. That the donor and acceptor be partially positive, the hydrogen partially negative

d. All of the above are correct

Explanation / Answer

I've answered Q3. Repost the other questions as separate questions.

The geometry of a molecule using VSEPR theory is can determined by first finding it's hybridization. It does not depend on the physical state or the inherent orbital configuration. Hence, the answer is option b.

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