Question 1

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two solutions are mixed.

Question 2

What is the net ionic equation for the reaction between aqueous sodium sulfate and barium chloride?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 3

A student mixes 50.0 mL of 0.100 M HCl with 50.0 mL of 0.100 M NaOH. What is the final concentration of NaCl in the solution after the reaction is complete?

Accepted Answer

$$0.100\ \mathrm{M}$$

Question 4

Which quantum number determines the shape of an orbital?

Accepted Answer

The azimuthal quantum number $$l$$

Question 5

Which element has the highest first ionization energy?

Accepted Answer

Helium ($$\mathrm{He})$$

Question 6

What is the electron configuration for the $$\mathrm{O$$^{2-}$$}$$ ion?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 7

Which of the following statements about Hund’s rule is correct?

Accepted Answer

Electrons fill degenerate orbitals singly before pairing.

Question 8

A solution is prepared by diluting 25.0 mL of 2.00 M NaCl to a final volume of 100.0 mL. What is the final concentration?

Accepted Answer

$$0.500\ \mathrm{M}$$

Question 9

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{2Na (s) + Cl_2$ (g) \rightarrow 2NaCl (s)}$$

Question 10

Which of the following ions has the largest ionic radius?

Accepted Answer

$$\mathrm{S$$^{2-}$$}$$

Question 11

What is the oxidation state of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

+6

Question 12

Which of the following best describes the Pauli exclusion principle?

Accepted Answer

No two electrons in an atom can have the same set of four quantum numbers.

Question 13

Which of the following elements has the smallest atomic radius?

Accepted Answer

Fluorine ($$\mathrm{F})$$

Question 14

A titration is performed using 0.250 M HCl and 0.200 M NaOH. If 35.0 mL of NaOH is required to neutralize 25.0 mL of HCl, what is the balanced equation and which reactant is in excess?

Accepted Answer

Balanced equation: $$\mathrm{HCl (aq) + NaOH (aq) \rightarrow NaCl (aq) + H_2O (l)}$$; HCl is in excess.

Question 15

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

Accepted Answer

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

Question 16

Which of the following best explains why the atomic radius decreases across a period?

Accepted Answer

Increasing nuclear effective charge pulls electrons closer to the nucleus.

Question 17

Which of the following is the correct set of quantum numbers for the last electron in phosphorus ($$\mathrm{P}$$)?

Accepted Answer

$$n=3,\ l=1,\ m_l=1,\ m_s=+\frac{1}{2}$$

Question 18

Which of the following reactions is an acid-base neutralization?

Accepted Answer

$$\mathrm{$$HNO_3$$ (aq) + KOH (aq) \rightarrow $$KNO_3$$ (aq) + H_2O (l)}$$

Question 19

Which of the following best describes the octet rule?

Accepted Answer

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

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

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