Unit Five Self-Assessment Questions.docx

A moo 2 h 2 o h 2 moo 3 b moo 2 4 h 2 mo 2 h 2 o c 2

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a. MoO 2 + H 2 O H 2 MoO 3 b. MoO 2 + 4 H 2 Mo + 2 H 2 O c. 2 MoO 2 + O 2 2 MoO 3 d. MoO 2 + 4 H + Mo 4+ + 2 H 2 O 5) According to the following equation, Cl 2 is 3 Cl 2 + 2 Al 2 AlCl 3 a. Both oxidized and reduced b. Neither oxidized nor reduced c. Oxidized only d. Reduced only 6) According to the following partial equation, manganese Mn Mn 2+ + 2 e - a. Gains electrons and is oxidized b. Gains electrons and is reduced c. Loses electrons and is oxidized d. Loses electrons and is reduced 7) When an element is oxidized, its oxidation number a. Decreases, as electrons are gained b. Decreases, as electrons are lost c. Increases, as electrons are gained d. Increases, as electrons are lost 8) What are the oxidation numbers of sodium and oxygen atoms in Na 2 O, respectively? a. 0, 0 b. +1, +1 c. +1, -2 d. +1, -1 9) What is the oxidation number of manganese in KMnO 4 ? a. +7 b. +8 c. +1 d. +6 10) Which of the following statements is correct in regards to assigning oxidation numbers? a. Alkali metals can have an oxidation number of either 1+ or -1 b. Halogens can never have an oxidation number of -1 c. Oxygen must always have an oxidation number of -2, even in elemental form d. The oxidation number of alkaline earth metals in ionic compounds is always +2 11) What is the charge of the PO 4 n- ion, in which phosphorus has the oxidation number of +5 and each of the oxygen atoms has the oxidation number of -2? a. 0 b. 1- c. 2- d. 3- Section Two 1) A reducing agent a. Gains electrons b. Gains protons c. Loses electrons d. Loses protons 2) When a compound gains two electrons, it is
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Unit Five Test on March 31, 2017 a. An oxidizing agent b. A reducing agent c. Oxidized d. A double-reducing agent 3) If an oxidation number of an atom in a compound increases from 2+ to 4+, the compound a. Is a reducing agent b. Is an oxidizing agent c. Gains electrons d. Gains protons 4) Which substance is the oxidizing agent in the following reaction? Cu (s) + 2 Ag + (aq) Cu 2+ (aq) + 2 Ag (s) a. Ag b. Ag + c. Cu d. Cu 2+ 5) In the following reaction, the reducing agent is Al (s) + Cr 3+ (aq) Al 3+ (aq) + Cr (s) a. Al (s) b. Al 3+ (aq) c. Cr 3+ (aq) d. Cr (s) 6) What is the oxidizing agent in the following reaction? Zn (s) + 2 Tl + (aq) Zn 2+ (aq) + 2 Tl (s) a. Tl (s) b. Tl + (aq) c. Zn (s) d. Zn 2+ (aq) 7) What is the reducing agent in the following reaction? 12 H + (aq) + 2 IO 3 - (aq) + 10 Fe 2+ (aq) 10 Fe 3+ (aq) + I 2 (s) + 6 H 2 O (l) a. Fe 2+ (aq) b. H + (aq) c. I 2 (s) d. IO 3 - (aq) Section Three 1) In an electrochemical cell, electrons flow from the a. Anode to the cathode b. Cathode to the anode c. Anode to the salt bridge d. Salt bridge to the cathode 2) In the electrochemical cell whose overall reaction is represented by the following equation, the negative electrode is Zn (s) + Cu 2+ (aq) Zn 2+ (aq) + Cu (s) a. Cu (s) b. Cu 2+ (aq) c. Zn (s) d. Zn 2+ (aq) 3) In the zinc-carbon cell, the anode is ___ and the cathode is ___.
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