Question 1

Which of the following molecules has a central atom with $$sp^3d^2$ hybridization?

Accepted Answer

SF6

Question 2

According to Molecular Orbital Theory, which of the following diatomic species is paramagnetic?

Accepted Answer

O2

Question 3

What is the bond order of the $$\mathrm{N_2$}$$ molecule based on its molecular orbital diagram?

Accepted Answer

$$3$$

Question 4

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule $$\mathrm{C_2H_2} ($$acetylene)?

Accepted Answer

3 sigma, 2 pi

Question 5

A student mixes aqueous solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}. $$What is the balanced molecular equation for the reaction, and what precipitate forms?

Accepted Answer

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

Question 6

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

$$\mathrm{NaCl}$$

Question 7

A solution is prepared by diluting $$25.0\ \mathrm{mL} of$$ $$2.00\ \mathrm{M}$$ $$\mathrm{HCl} to a $$final volume of $$500.0\ \mathrm{mL}. $$What is the final concentration?

Accepted Answer

$$0.100\ \mathrm{M}$$

Question 8

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$?

Accepted Answer

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

Question 9

A $$5.00\ \mathrm{g}$$ sample of $$\mathrm{$$CaCO_3$$}$$ reacts with excess $$\mathrm{HCl}$$ according to the equation $$\mathrm{$$CaCO_3$$(s) + 2HCl(aq) \rightarrow $$CaCl_2$$(aq) + CO_2$(g) + H_2O(l)}. $$What is the theoretical yield of $$\mathrm{CO_2$} (in $$grams)? (Molar mass of $$\mathrm{$$CaCO_3$$} = 100.1\ \mathrm{g/mol}$$, $$\mathrm{CO_2$} = 44.0\ \mathrm{g/mol})$$

Accepted Answer

$$2.20\ \mathrm{g}$$

Question 10

Which of the following is a redox reaction?

Accepted Answer

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

Question 11

Which of the following statements about acids and bases is correct according to the Brønsted-Lowry definition?

Accepted Answer

An acid is a proton donor and a base is a proton acceptor.

Question 12

Which of the following compounds is a strong base?

Accepted Answer

$$\mathrm{KOH}$$

Question 13

A $$50.0\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ $$\mathrm{NaOH} is $$neutralized by $$\mathrm{H_2SO_4}$$ according to the equation $$2\mathrm{NaOH} + \mathrm{H_2SO_4} \rightarrow 2\mathrm{H_2O} + \mathrm{Na_2SO_4}. $$What volume (in mL) of $$0.100\ \mathrm{M}$$ $$\mathrm{H_2SO_4} is $$required?

Accepted Answer

$$50.0\ \mathrm{mL}$$

Question 14

Which of the following best describes the difference between a dilute and a concentrated solution?

Accepted Answer

A dilute solution has a lower amount of solute per unit volume than a concentrated solution.

Question 15

Assign the oxidation number to sulfur in $$\mathrm{H_2SO_4}.$$

Accepted Answer

$$+6$$

Question 16

Which of the following is the correct dissociation equation for $$\mathrm{K_2SO_4} in $$water?

Accepted Answer

$$\mathrm{K_2SO_4(s) \rightarrow 2K^+(aq) + SO_4$^{2-}(aq)}$$

Question 17

A reaction has a theoretical yield of $$10.0\ \mathrm{g}$$ and an actual yield of $$7.5\ \mathrm{g}. $$What is the percent yield?

Accepted Answer

$$75\%$$

Question 18

Which of the following is the correct balanced equation for the combustion of propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

$$\mathrm{C_3H_8(g) + 5O_2(g) \rightarrow 3CO_2(g) + 4H_2O(g)}$$

General Chemistry Study Guide: Valence Bond Theory, Chemical Reactions, and Aqueous Solutions (Chapters 6-8)

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