Question 1

Which of the following is the correct balanced equation for the reaction between aqueous sodium sulfate and barium chloride, and what is the precipitate formed?

Accepted Answer

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

Question 2

A student mixes $$50.0\ \mathrm{mL} of$$ $$0.200\ \mathrm{M}$$ $$\mathrm{HCl}$$ with $$25.0\ \mathrm{mL} of$$ $$0.400\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What is the limiting reactant, and what is the final solution's pH?

Accepted Answer

Limiting reactant: $$\mathrm{NaOH}$$; pH $$\u003c 7$$

Question 3

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

Accepted Answer

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

Question 4

Which of the following best describes an oxidation-reduction (redox) reaction?

Accepted Answer

A reaction in which electrons are transferred from one species to another.

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 elements has the highest first ionization energy?

Accepted Answer

$$\mathrm{Ne}$$

Question 7

What is the abbreviated electron configuration for $$\mathrm{Fe$$^{3+}$$}$$?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^5$

Question 8

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

Accepted Answer

Atomic radius increases down a group and decreases across a period from left to right.

Question 9

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

Accepted Answer

$$25.0\ \mathrm{mL}$$

Question 10

Which of the following ions has the largest ionic radius?

Accepted Answer

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

Question 11

Which of the following best describes Hund’s rule?

Accepted Answer

Electrons fill degenerate orbitals singly before pairing.

Question 12

Which of the following is the correct complete ionic equation for the reaction of $$\mathrm{HCl}$$ with $$\mathrm{NaOH} in $$aqueous solution?

Accepted Answer

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

Question 13

Which of the following is the correct set of quantum numbers for the last electron added to a phosphorus atom ($$Z=15$$)?

Accepted Answer

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

Question 14

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 15

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{H_2SO_4}$$ and $$\mathrm{Ba(OH)_2}$$?

Accepted Answer

$$2\mathrm{H^+(aq) + 2OH^-(aq) \rightarrow 2H_2O(l)}$$

Question 16

Which of the following best explains why $$\mathrm{Mg$$^{2+}$$} is $$smaller than $$\mathrm{Na^+}$$?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$}$$ has a higher nuclear charge with the same number of electrons, pulling them closer.

Question 17

A solution is prepared by diluting $$10.0\ \mathrm{mL} of$$ $$6.00\ \mathrm{M}$$ $$\mathrm{HCl} to a $$final volume of $$250.0\ \mathrm{mL}. $$What is the final concentration?

Accepted Answer

$$0.240\ \mathrm{M}$$

Question 18

Which of the following is the correct electron configuration for a chloride ion ($$\mathrm{Cl^-}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 19

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.

General Chemistry Study Notes: Chemical Reactions, Solution Stoichiometry, and Periodic Trends

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