Q: A sample contains $2.65$ mol of oxalic acid ($\mathrm{H_2C_2O_4}$). How many hydrogen atoms are present in this sample?

$2 \times 2.65 \times 6.022 \times 10^{23}$ atoms

Q: Which of the following sets of quantum numbers is invalid, and why?

$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$;\ l$ cannot equal $n$

Q: What is the energy (in J) of a photon released when an electron in a hydrogen atom falls from $n=5$ to $n=1$? ($E_n = -2.18 \times 10^{-18}\ \mathrm{J}\ /\ n^2$)

$2.09 \times 10^{-18}\ \mathrm{J}$

Q: Which of the following is the correct net ionic equation for the reaction between Na$_2$CO$_3$(aq) and NiCl$_2$(aq)?

$\mathrm{CO_3^{2-}(aq) + Ni^{2+}(aq) \rightarrow NiCO_3(s)}$

Q: Which of the following statements about effective nuclear charge ($Z_{\mathrm{eff}}$) is correct?

$Z_{\mathrm{eff}}$ increases across a period from left to right.

Q: Which of the following best explains the anomaly in first ionization energy between Zn and Ga?

Ga has a lower first ionization energy than Zn because the added electron enters a higher energy p-orbital, which is less tightly held.

Question 1

Which of the following is the correct systematic name for the compound with the formula $\mathrm{Fe_2(SO_4)_3}$?

Accepted Answer

Iron(III) sulfate

Question 2

A sample contains $2.65$ mol of oxalic acid ($\mathrm{H_2C_2O_4}$). How many hydrogen atoms are present in this sample?

Accepted Answer

$2 	imes 2.65 	imes 6.022 	imes 10^{23}$ atoms

Question 3

What is the molarity of a solution prepared by dissolving $5.00$ g of NaCl in enough water to make $250.0$ mL of solution? ($M_{\mathrm{NaCl}} = 58.44\ \mathrm{g/mol}$)

Accepted Answer

$0.342\ \mathrm{M}$

Question 4

Which of the following pairs of elements is ranked correctly in order of increasing atomic radius?

Accepted Answer

Sn < Ru < Rb

Question 5

A $100.0$ mL sample of $1.36$ M NaBr(aq) has a density of $1.129$ g/mL. What is the mass percent of NaBr in this solution? ($M_{\mathrm{NaBr}} = 102.89\ \mathrm{g/mol}$)

Accepted Answer

$12.4\%$

Question 6

Which of the following sets of quantum numbers is invalid, and why?

Accepted Answer

$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$;\ l$ cannot equal $n$

Question 7

A solution is prepared by mixing $100.0$ mL of $0.256$ M NaBr, $200.0$ mL of $0.685$ M MgCl$_2$, and $300.0$ mL of $0.125$ M AlBr$_3$. What is the final molarity of Br$^-$ ions in the mixture?

Accepted Answer

$0.138\ \mathrm{M}$

Question 8

Which of the following bonds has the highest percent ionic character?

Accepted Answer

K–F

Question 9

What is the energy (in J) of a photon released when an electron in a hydrogen atom falls from $n=5$ to $n=1$? ($E_n = -2.18 	imes 10^{-18}\ \mathrm{J}\ /\ n^2$)

Accepted Answer

$2.09 	imes 10^{-18}\ \mathrm{J}$

Question 10

Which of the following elements has the highest first ionization energy?

Accepted Answer

O

Question 11

A $100.0$ mL sample of $0.526$ M LiF is diluted to $0.129$ M. What volume of water must be added?

Accepted Answer

$300.0$ mL

Question 12

Which of the following is the correct net ionic equation for the reaction between Na$_2$CO$_3$(aq) and NiCl$_2$(aq)?

Accepted Answer

$\mathrm{CO_3^{2-}(aq) + Ni^{2+}(aq) \rightarrow NiCO_3(s)}$

Question 13

Which of the following statements about effective nuclear charge ($Z_{\mathrm{eff}}$) is correct?

Accepted Answer

$Z_{\mathrm{eff}}$ increases across a period from left to right.

Question 14

Which of the following ions has the largest ionic radius?

Accepted Answer

O$^{2-}$

Question 15

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$\mathrm{(NH_4)_2SO_4}$

Question 16

Which of the following best explains the anomaly in first ionization energy between Zn and Ga?

Accepted Answer

Ga has a lower first ionization energy than Zn because the added electron enters a higher energy p-orbital, which is less tightly held.

Question 17

Which of the following bonds is ranked correctly in order of increasing percent covalent character?

Accepted Answer

K–F < K–S < K–Se < K–K

Question 18

A $12.5$ g sample of propane ($\mathrm{C_3H_8}$) reacts with $51.0$ g of $\mathrm{O_2}$ to form $\mathrm{CO_2}$ and $\mathrm{H_2O}$. If only $7.22$ g of $\mathrm{CO_2}$ is formed, what is the percent yield?

Accepted Answer

$22.2\%$

Question 19

Which of the following elements has the highest electronegativity?

Accepted Answer

P

General Chemistry Study Guide: Nomenclature, Conversions, and Solution Concentrations

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