Question 1

Which of the following best describes what is transferred between reactants in a redox reaction?

Accepted Answer

electrons

Question 2

Determine the oxidation state of phosphorus in $$\mathrm{PO_3$^{3-}}.$$

Accepted Answer

+3

Question 3

Which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{Hg_2I_2}$$

Question 4

A balloon is initially at $$9^\circ\mathrm{C}$$ and $$4.00\ \mathrm{L}. To $$what temperature (in K) must it be heated to reach $$6.00\ \mathrm{L} at $$constant pressure?

Accepted Answer

$$423\ \mathrm{K}$$

Question 5

Which of the following is the correct definition of pressure?

Accepted Answer

Amount of force exerted per unit area

Question 6

What is the concentration of a solution prepared by diluting $$25.0\ \mathrm{mL} of a$$ $$0.188\ \mathrm{M}\ \mathrm{Mg(NO_3$)_2}$$ stock solution to $$150.0\ \mathrm{mL}$$?

Accepted Answer

$$0.0313\ \mathrm{M}$$

Question 7

A helium-filled balloon at $$20^\circ\mathrm{C} is $$taken outside where the temperature is $$29^\circ\mathrm{C}. $$The pressure remains constant and no helium escapes. What happens to the volume?

Accepted Answer

The volume increases.

Question 8

Which instrument is used to measure atmospheric pressure?

Accepted Answer

Barometer

Question 9

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{HCl(aq)}$$ and $$\mathrm{NaOH(aq)}$$?

Accepted Answer

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

Question 10

Identify the spectator ion(s) in the following reaction: $$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow Cu(s) + Zn$$^{2+}$$(aq) + SO_4$^{2-}(aq)}$$

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 11

Which species is oxidized in the reaction where $$\mathrm{Cr(OH)_4^-}$$ reacts with $$\mathrm{ClO^-}$$?

Accepted Answer

$$\mathrm{Cr(OH)_4^-}$$

Question 12

A student dissolves $$20.0\ \mathrm{g} of $$KOH in enough water to make $$150.0\ \mathrm{mL} of $$solution. What is the molarity of the stock solution? ($$\mathrm{M_{KOH} = 56.11\ g/mol})$$

Accepted Answer

$$2.38\ \mathrm{M}$$

Question 13

Given the balanced equation $$4\mathrm{$$KNO_3$$(s)} \rightarrow 2\mathrm{K_2O(s)} + 2\mathrm{N_2$(g)} + 5\mathrm{O_2$(g)}$$, how many moles of $$\mathrm{O_2$}$$ are formed from $$58.6\ \mathrm{g} of$$ $$\mathrm{$$KNO_3$$}$$? ($$\mathrm{M_{$$KNO_3$$} = 101.11\ g/mol})$$

Accepted Answer

$$0.290\ \mathrm{mol}$$

Question 14

Calculate the temperature (in K) of $$2.20$$ moles of gas occupying $$4100\ \mathrm{mL} at$$ $$2.82\ \mathrm{atm}$$. ($$R = 0.0821\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$})$$

Accepted Answer

$$62.5\ \mathrm{K}$$

Question 15

Which of the following is the correct balanced equation for the reaction: $$\mathrm{H_2$(g) + Cl_2$(g) \rightarrow HCl(g)}$$?

Accepted Answer

$$\mathrm{H_2$(g) + Cl_2$(g) \rightarrow 2HCl(g)}$$

Question 16

A $$10.0\ \mathrm{L}$$ tank contains $$48.5\ \mathrm{g} He $$and $$94.6\ \mathrm{g} CO$_2 at$$ $$398\ \mathrm{K}. $$What is the total pressure exerted by the gas mixture? ($$R = 0.0821\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$}$$; $$M_{He} = 4.00\ \mathrm{g/mol}$$, $$M_{CO_2$} = 44.0\ \mathrm{g/mol})$$

Accepted Answer

$$15.2\ \mathrm{atm}$$

Question 17

Which of the following reactions is correctly balanced?

Accepted Answer

$$2\mathrm{CO_2$(g)} + \mathrm{$$CaSiO_3$$(s)} + \mathrm{H_2O(l)} \rightarrow \mathrm{$$SiO_2$$(s)} + \mathrm{Ca($$HCO_3$$)_2(aq)}$$

Question 18

A student prepares a stock solution by dissolving $$20.0\ \mathrm{g} of $$KOH in enough water to make $$150.0\ \mathrm{mL} of $$solution. She then takes $$15.0\ \mathrm{mL} of $$the stock solution and dilutes it to $$65.0\ \mathrm{mL}. $$What is the final concentration of KOH?

Accepted Answer

$$0.549\ \mathrm{M}$$

Balancing Chemical Equations and Identifying Redox Species

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