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

What is the molarity of a solution prepared by dissolving 5.85 g of NaCl (molar mass = 58.5 g/mol) in enough water to make 0.500 L of solution?

Accepted Answer

$$0.200\ \mathrm{M}$$

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

A student needs to prepare 250 mL of a 0.100 M HCl solution from a 1.00 M stock solution. What volume of the stock solution should be used?

Accepted Answer

$$25.0\ \mathrm{mL}$$

Question 6

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 7

Which element has the highest first ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 8

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

Accepted Answer

$$\mathrm{K^+}$$

Question 9

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 10

Which of the following best explains why the ionic radius of $$\mathrm{O$$^{2-}$$} is $$larger than that of $$\mathrm{F^-}$$?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$ has more electrons than $$\mathrm{F^-}$$, resulting in greater electron-electron repulsion.

Question 11

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

Accepted Answer

$$[\mathrm{Ar}]\ 4s^2$

Question 12

A solution contains $$0.250\ \mathrm{mol} of$$ $$\mathrm{$$KNO_3$$}$$ dissolved in $$500\ \mathrm{mL} of $$water. What is the molarity of the solution?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 13

Which of the following best describes Hund’s rule?

Accepted Answer

Electrons fill degenerate orbitals singly before pairing up.

Question 14

Which of the following is the correct net ionic equation for the precipitation reaction between aqueous solutions of silver nitrate and sodium chloride?

Accepted Answer

$$\mathrm{Ag^+\ (aq) + Cl^-\ (aq) \rightarrow AgCl\ (s)}$$

Question 15

Which of the following elements is most likely to gain one electron to achieve a noble gas configuration?

Accepted Answer

Chlorine ($$\mathrm{Cl})$$

Question 16

A $$25.0\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ $$\mathrm{H_2SO_4} is $$titrated with $$0.100\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$100\ \mathrm{mL}$$

Question 17

Which of the following best explains why fluorine has a higher electron affinity than oxygen?

Accepted Answer

Fluorine has a higher effective nuclear charge, attracting electrons more strongly.

Question 18

Which of the following is the correct oxidation state of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 19

Which of the following statements about the octet rule is correct?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.

Question 20

Which of the following best describes the shape of a $$p$$ orbital?

Accepted Answer

Dumbbell-shaped

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

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