Question 1

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Question 2

Given the unbalanced equation: $$\mathrm{C_3H_8 (g) + O_2$ (g) \rightarrow CO_2$ (g) + H_2O (g)}$$, what are the correct coefficients to balance the equation?

Accepted Answer

$$1, 5, 3, 4$$

Question 3

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

Accepted Answer

$$\mathrm{AgCl}$$

Question 4

What is the net ionic equation for the reaction between aqueous solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$?

Accepted Answer

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

Question 5

Which species is being oxidized in the following reaction? $$\mathrm{Zn (s) + $$CuSO_4$$ (aq) \rightarrow $$ZnSO_4$$ (aq) + Cu (s)}$$

Accepted Answer

$$\mathrm{Zn}$$

Question 6

How many molecules are present in 0.25 moles of $$\mathrm{CO_2$}$$? (Avogadro’s number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$3.01 	imes 10$$^{23}$$

Question 7

What is the molar mass of $$\mathrm{Ca(NO_3$)_2}$$?

Accepted Answer

$$164 \ \mathrm{g/mol}$$

Question 8

A reaction has a theoretical yield of 10.0 g but only 7.5 g of product is actually obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 9

Which of the following is the correct balanced equation for the reaction of aluminum with oxygen to form aluminum oxide?

Accepted Answer

$$4\mathrm{Al (s) + 3O_2 (g) \rightarrow 2Al_2O_3 (s)}$$

Question 10

If 5.0 g of $$\mathrm{H_2$}$$ reacts with 40.0 g of $$\mathrm{O_2$} to $$form water, which is the limiting reagent? (Molar masses: $$\mathrm{H_2$} = 2.0 \ \mathrm{g/mol}$$, $$\mathrm{O_2$} = 32.0 \ \mathrm{g/mol})$$

Accepted Answer

$$\mathrm{O_2$}$$

Question 11

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two solutions are mixed.

Question 12

How many grams of $$\mathrm{NaCl}$$ are needed to prepare 0.50 moles? (Molar mass of $$\mathrm{NaCl} = 58.5 \ \mathrm{g/mol})$$

Accepted Answer

$$29.25 \ \mathrm{g}$$

Question 13

Which of the following is the oxidizing agent in the reaction: $$\mathrm{2Fe (s) + 3Cl_2 (g) \rightarrow 2FeCl_3 (s)}$$?

Accepted Answer

$$\mathrm{Cl_2$}$$

Question 14

A solution contains $$\mathrm{$$KNO_3$$}$$ and $$\mathrm{$$AgNO_3$$}. $$Which anion is a spectator ion in a reaction with $$\mathrm{NaCl}$$?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 15

Which of the following is the correct net ionic equation for the reaction of $$\mathrm{HCl}$$ with $$\mathrm{NaOH}$$?

Accepted Answer

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

Question 16

If you have 3.0 moles of $$\mathrm{O_2$}$$, how many grams do you have? (Molar mass of $$\mathrm{O_2$} = 32.0 \ \mathrm{g/mol})$$

Accepted Answer

$$96.0 \ \mathrm{g}$$

Question 17

Which of the following is NOT a redox reaction?

Accepted Answer

$$\mathrm{HCl (aq) + NaOH (aq) \rightarrow NaCl (aq) + H_2O (l)}$$

Question 18

A student mixes $$\mathrm{Pb(NO_3$)_2}$$ and $$\mathrm{KI} in $$water and observes a yellow precipitate. What is the identity of the precipitate?

Accepted Answer

$$\mathrm{$$PbI_2$$}$$

Question 19

Which of the following best describes the role of a reducing agent in a chemical reaction?

Accepted Answer

It donates electrons and is itself oxidized.

Chemistry 1110 Exam 3 Study Guide: Classification & Balancing of Chemical Reactions and Mole & Mass Relationships

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