Question 1

Given the balanced equation $$\mathrm{Pb(NO_3$)_2(aq) + 2HCl_{(aq)} \rightarrow $$PbCl_2$$(s) + 2HNO_3(aq)}$$, if you have 7.55 g of hydrochloric acid dissolved in 350.0 mL of solution, what is the molarity of the HCl solution? (Molar mass of HCl = 36.46 g/mol)

Accepted Answer

$$0.592\ \mathrm{M}$$

Question 2

Using the information from the previous question, how many liters of a $$0.525\ \mathrm{M}$$ $$\mathrm{Pb(NO_3$)_2}$$ solution are required to completely react with $$0.155\ \mathrm{L} of $$the $$0.592\ \mathrm{M}$$ HCl solution? (Use the balanced equation: $$\mathrm{Pb(NO_3$)_2(aq) + 2HCl_{(aq)} \rightarrow $$PbCl_2$$(s) + 2HNO_3(aq)})$$

Accepted Answer

$$0.0875\ \mathrm{L}$$

Question 3

Which of the following compounds is soluble in water?

Accepted Answer

$$\mathrm{K_2S}$$

Question 4

Which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 5

What is the net ionic equation for the reaction between $$\mathrm{HCl_{(aq)}}$$ and $$\mathrm{Ca(OH)_2(aq)}$$?

Accepted Answer

$$2\mathrm{H^+_{(aq)}} + 2\mathrm{OH^-_{(aq)}} \rightarrow 2\mathrm{H_2O_{(l)}}$$

Question 6

Given the reaction $$2\mathrm{LiOH_{(aq)}} + \mathrm{$$CuCl_2$$(aq)} \rightarrow 2\mathrm{LiCl_{(aq)}} + \mathrm{Cu(OH)_2(s)}$$, what is the precipitate formed?

Accepted Answer

$$\mathrm{Cu(OH)_2}$$

Question 7

What are the oxidation states of chromium and oxygen in $$\mathrm{Cr_2O_7$$^{2-}$$}$$?

Accepted Answer

Cr: $$+6$$, O: $$-2$$

Question 8

Determine the oxidation state of phosphorus in $$\mathrm{PO_4$^{3-}}.$$

Accepted Answer

$$+5$$

Question 9

In the reaction $$\mathrm{$$SiCl_4$$} + 2\mathrm{Mg} \rightarrow 2\mathrm{$$MgCl_2$$} + \mathrm{Si}$$, which element is oxidized?

Accepted Answer

Mg

Question 10

In the reaction $$\mathrm{$$SiCl_4$$} + 2\mathrm{Mg} \rightarrow 2\mathrm{$$MgCl_2$$} + \mathrm{Si}$$, what is the reducing agent?

Accepted Answer

Mg

Question 11

Which of the following best describes the role of $$\mathrm{$$SiCl_4$$} in $$the reaction $$\mathrm{$$SiCl_4$$} + 2\mathrm{Mg} \rightarrow 2\mathrm{$$MgCl_2$$} + \mathrm{Si}$$?

Accepted Answer

Oxidizing agent

Question 12

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{Ca(NO_3$)_2}$$ and $$\mathrm{$$BaSO_4$$}$$?

Accepted Answer

No reaction occurs because $$\mathrm{$$BaSO_4$$} is $$already a solid.

Question 13

A solution contains $$\mathrm{K_2S}$$ and $$\mathrm{$$BaSO_4$$}. $$Which ion would you expect to be present in the solution after filtration?

Accepted Answer

$$\mathrm{K^+}$$

Question 14

Which of the following best explains why $$\mathrm{$$BaSO_4$$} is $$used in medical imaging despite containing toxic barium?

Accepted Answer

$$\mathrm{$$BaSO_4$$} is $$insoluble in water and does not release toxic $$\mathrm{Ba$$^{2+}$$}$$ ions in the body.

Question 15

If $$0.250\ \mathrm{mol} of$$ $$\mathrm{HCl}$$ reacts with $$0.125\ \mathrm{mol} of$$ $$\mathrm{Ca(OH)_2}$$, what is the limiting reactant? (Reaction: $$2\mathrm{HCl} + \mathrm{Ca(OH)_2} \rightarrow 2\mathrm{H_2O} + \mathrm{$$CaCl_2$$})$$

Accepted Answer

$$\mathrm{Ca(OH)_2}$$

Question 16

Which of the following best describes the oxidation state of chlorine in $$\mathrm{$$CaCl_2$$}$$?

Accepted Answer

$$-1$$

Question 17

A student mixes $$\mathrm{$$CuCl_2$$}$$ and $$\mathrm{LiOH} in $$water. What is the balanced molecular equation for the reaction?

Accepted Answer

$$\mathrm{$$CuCl_2$$(aq)} + 2\mathrm{LiOH(aq)} \rightarrow \mathrm{Cu(OH)_2(s)} + 2\mathrm{LiCl(aq)}$$

Question 18

Which of the following is the correct oxidation state for chromium in $$\mathrm{CaCr_2O_7}$$?

Accepted Answer

$$+6$$

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