Question 1

Which of the following is the correct balanced equation for the reaction between aqueous sodium sulfate and barium chloride to form a precipitate?

Accepted Answer

$$\mathrm{Na_2SO_4\ (aq) + $$BaCl_2$$\ (aq) \rightarrow 2NaCl\ (aq) + $$BaSO_4$$\ (s)}$$

Question 2

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species, resulting in changes in oxidation states.

Question 3

A solution is prepared by diluting $$25.0\ \mathrm{mL} of$$ $$2.00\ \mathrm{M}$$ HCl to a final volume of $$100.0\ \mathrm{mL}. $$What is the final concentration of HCl?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 4

Which of the following is the correct net ionic equation for the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{H^+\ (aq) + OH^-\ (aq) \rightarrow H_2O\ (l)}$$

Question 5

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 6

Which of the following ions has the same electron configuration as neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 7

Which element has the highest first ionization energy?

Accepted Answer

$$\mathrm{Ne}$$

Question 8

Which of the following statements about the periodic trend in atomic radius is correct?

Accepted Answer

Atomic radius decreases across a period from left to right due to increasing effective nuclear charge.

Question 9

Which of the following is the correct abbreviated electron configuration for chlorine ($$\mathrm{Cl}$$)?

Accepted Answer

$$[\mathrm{Ne}]\ 3s^2$\ 3p^5$

Question 10

A $$50.0\ \mathrm{mL}$$ sample of $$0.100\ \mathrm{M}$$ NaOH is titrated with $$0.200\ \mathrm{M}$$ HCl. What volume of HCl is required to reach the equivalence point?

Accepted Answer

$$25.0\ \mathrm{mL}$$

Question 11

Which of the following best explains why the ionic radius of $$\mathrm{Cl^-} is $$larger than that of $$\mathrm{Na^+}$$?

Accepted Answer

$$\mathrm{Cl^-}$$ has more electrons, resulting in greater electron-electron repulsion and a larger radius.

Question 12

Which of the following is a precipitation reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$\ (aq) + NaCl\ (aq) \rightarrow AgCl\ (s) + $$NaNO_3$$\ (aq)}$$

Question 13

Which of the following best describes Hund’s rule?

Accepted Answer

Electrons fill degenerate orbitals singly before pairing.

Question 14

Which of the following elements is most likely to violate the octet rule?

Accepted Answer

$$\mathrm{P}$$

Question 15

What is the oxidation state of sulfur in $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$+6$$

Question 16

Which of the following statements about electron affinity is correct?

Accepted Answer

Electron affinity generally becomes more negative across a period from left to right.

Question 17

Which of the following is the correct complete ionic equation for the reaction between potassium nitrate and sodium chloride in aqueous solution?

Accepted Answer

$$\mathrm{K^+\ (aq) + NO_3$^-\ (aq) + Na^+\ (aq) + Cl^-\ (aq) \rightarrow K^+\ (aq) + Cl^-\ (aq) + Na^+\ (aq) + NO_3$^-\ (aq)}$$

Question 18

Which of the following best explains why the $$2p$$ orbitals are higher in energy than the $$2s$$ orbital in a multi-electron atom?

Accepted Answer

The $$2p$$ orbitals experience less shielding from the nucleus than the $$2s$$ orbital.

General Chemistry Study Notes: Reactions in Aqueous Solution, Periodicity, and Ionic Bonding

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