Question 1

A patient in a hospital receives oxygen from a tank at 2.0 atm and 300 K. If the oxygen is transferred to a mask at 1.0 atm and the temperature remains constant, what will be the final volume if the initial volume was 5.0 L? Use the combined gas law: $\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2}$.

Accepted Answer

$V_2 = 10.0\ 	ext{L}$

Question 2

Which of the following best describes the relationship between pressure and volume for a gas at constant temperature, according to Boyle's Law?

Accepted Answer

Pressure and volume are inversely proportional.

Question 3

A nurse needs to prepare 250 mL of a 0.10 M NaCl solution from a 1.0 M stock solution. What volume of stock solution should be used? Use the dilution equation: $C_1 V_1 = C_2 V_2$.

Accepted Answer

$V_1 = 50\ 	ext{mL}$

Question 4

Which formula is used to calculate the pH of a solution given the concentration of hydronium ions $[H_3O^+]$?

Accepted Answer

$	ext{pH} = -\log [H_3O^+]$

Question 5

A buffer solution contains 0.20 M acetic acid and 0.10 M acetate. If $pK_a$ for acetic acid is 4.76, what is the pH of the solution? Use the Henderson-Hasselbalch equation: $	ext{pH} = pK_a + \log \left( \frac{[A^-]}{[HA]} ight)$.

Accepted Answer

$	ext{pH} = 4.46$

Question 6

Which of the following is the correct IUPAC name for a molecule with the formula $C_3H_8$?

Accepted Answer

Propane

Question 7

A redox reaction has a reduction potential of $+0.80\ 	ext{V}$ and an oxidation potential of $-0.40\ 	ext{V}$. What is the cell potential $E_{cell}$? Use: $E_{cell} = E_{reduction} - E_{oxidation}$.

Accepted Answer

$E_{cell} = +1.20\ 	ext{V}$

Question 8

Which of the following is a secondary (2°) alcohol?

Accepted Answer

2-Propanol

Question 9

A solution has a $[H_3O^+]$ of $1.0 	imes 10^{-5}\ 	ext{M}$. What is its pH?

Accepted Answer

$	ext{pH} = 5.0$

Question 10

Which of the following is the correct condensed structural formula for ethyl group?

Accepted Answer

$CH_3CH_2-$

Question 11

A balloon filled with 3.0 L of air at 1.0 atm and 300 K is heated to 400 K at constant pressure. What is the new volume? Use the combined gas law.

Accepted Answer

$V_2 = 4.0\ 	ext{L}$

Question 12

Which of the following is the correct formula for the butyl group?

Accepted Answer

$CH_3CH_2CH_2CH_2-$

Question 13

A buffer is made by mixing 0.50 M formic acid ($pK_a = 3.75$) and 0.50 M sodium formate. What is the pH of the buffer?

Accepted Answer

$	ext{pH} = 3.75$

Question 14

Which of the following statements about dilution is correct?

Accepted Answer

The amount of solute remains constant while the volume increases.

Question 15

A solution is prepared by mixing 100 mL of 0.5 M HCl with 400 mL of water. What is the final concentration of HCl?

Accepted Answer

$C_2 = 0.10\ 	ext{M}$

Question 16

Which of the following is the correct IUPAC name for a molecule with the formula $C_4H_{10}$?

Accepted Answer

Butane

Question 17

A patient’s blood pH is measured at 7.10. Is this considered acidic, basic, or neutral?

Accepted Answer

Acidic

Question 18

Which of the following is the correct formula for the propyl group?

Accepted Answer

$CH_3CH_2CH_2-$

Question 19

A chemical reaction has $E_{reduction} = +0.34\ 	ext{V}$ and $E_{oxidation} = -0.76\ 	ext{V}$. What is the cell potential?

Accepted Answer

$E_{cell} = +1.10\ 	ext{V}$

Essential Equations and Constants in GOB Chemistry

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