Question 1

Which of the following compounds would you expect to have the highest electrical conductivity when dissolved in water?

Accepted Answer

HI

Question 2

Which of the following is a correct balanced molecular equation for the reaction between lead(II) acetate and hydrobromic acid?

Accepted Answer

$$\mathrm{Pb(C_2H_3O_2)_2 (aq) + 2 HBr (aq) \rightarrow $$PbBr_2$$ (s) + 2 HC_2H_3O_2 (aq)}$$

Question 3

Which of the following is a spectator ion in the reaction between potassium chloride and silver nitrate in aqueous solution?

Accepted Answer

K$$^+$$

Question 4

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

Accepted Answer

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

Question 5

Which of the following compounds is a weak electrolyte in water?

Accepted Answer

CH\_3CH\_2OH

Question 6

In the reaction $$\mathrm{Zn (s) + 2 H^+ (aq) \rightarrow Zn$$^{2+}$$ (aq) + H_2$ (g)}$$, which species is oxidized?

Accepted Answer

Zn

Question 7

Which of the following is the correct oxidation number for oxygen in Na$$_2O$_2$$?

Accepted Answer

$$-1$$

Question 8

What is the correct net ionic equation for the reaction between manganese(II) sulfate and sodium phosphate?

Accepted Answer

$$\mathrm{3 Mn$$^{2+}$$ (aq) + 2 PO_4$^{3-} (aq) \rightarrow Mn_3$(PO_4$)_2 (s)}$$

Question 9

Which of the following is a strong acid according to the solubility and electrolyte rules?

Accepted Answer

HNO\_3

Question 10

In a redox reaction, what does the mnemonic 'OIL RIG' stand for?

Accepted Answer

Oxidation Is Loss, Reduction Is Gain (of electrons)

Question 11

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

BaSO\_4

Question 12

What is the oxidation number of chromium in Cr$$_2(Cr$_2O$_7$$)$$_3$$?

Accepted Answer

$$+6$$

Question 13

Which of the following reactions is a double displacement reaction?

Accepted Answer

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

Question 14

Which of the following is the correct net ionic equation for the reaction between lead(II) acetate and hydrobromic acid?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$ (aq) + 2 Br^- (aq) \rightarrow $$PbBr_2$$ (s)}$$

Question 15

Which of the following is the correct oxidation number for chlorine in ClO$$_4^-$$?

Accepted Answer

$$+7$$

Question 16

If a solution contains only NaCl and CH$$_3CH$_2OH$$, which statement is true about its conductivity?

Accepted Answer

It will have high conductivity due to NaCl.

Question 17

Which of the following is the correct net ionic equation for the reaction between iron(III) carbonate and nitric acid?

Accepted Answer

$$\mathrm{2 H^+ (aq) + CO_3$^{2-} (aq) \rightarrow H_2O (l) + CO_2$ (g)}$$

Question 18

Which of the following is true about spectator ions in a precipitation reaction?

Accepted Answer

They do not participate in the formation of the precipitate.

Question 19

In the reaction $$\mathrm{SO_4$^{2-} (aq) + $$MnO_4$$^- (aq) \rightarrow SO_2$ (aq) + Mn$$^{2+}$$ (aq)}$$, which element is reduced?

Accepted Answer

Manganese

Double Displacement and Redox Reactions: Conductivity, Balancing, and Net Ionic Equations

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