Each of the questions is graderd over 5 points. Answer 90 points. Oxidation is t

Question

Each of the questions is graderd over 5 points. Answer 90 points. Oxidation is the___ loss of mass. loss of protons. gain of protons. loss of electrons. gain of electrons. Glancing at a periodic table, where do you expect to find elements that are good reducing agents? on the left in groups 16 and 17 in group 17 at the bottom in the middle What is the oxidation number of chromium in the ionic compound ammonium dichromate. (NH_4)Cr_2O_7? + 3 +6 +4 + 5 +7 The following reaction occurs in basic solution. Identify the reducing agent. (Note: The equation is not balanced.) Zn(s) + NO_3 (aq) Rightarrow Zn(OH)_4 2-(aq) + NH_3(aq) H_2O(l) Zn(s) OH^-(aq) NO_3 -(aq) NH_3(aq) You have a job as a summer intern in an orange juice processing plant. Part of your job is to determine the amount of vitamin C in a given quantity of orange juicc. To make this determination, you titrate the orange juicc with I_J^-, the triiodide ion. To make sure you know what you arc doing, your supervisor asks you how many electrons are transferred in the reaction. The reaction describing the titration is given below. What is your response? Ascorbate + H_2O + I_3^- dehydroascorbate + 2H^- 3I^- 0 1 2 3 4 Which one of the following items does not characterize an oxidizing agent'? An oxidizing agent gains electrons. An oxidizing agent causes another species to be oxidized. The oxidation number of an oxidizing agent decreases. An example of a good oxidizing agent is an alkali metal, such as Na. A good oxidizing agent is a metal in a high oxidation state, such as Mn?'. Which statement about an anode in a voltaic cell is correct? Chemical spccies can have their oxidation number decreased at the anode. Reduction occurs at the anode Usually the anode is a bridge connects the two solutions of the cell In the external circuit, electrons flow toward the anode. Oxidation occurs at the anode.

Explanation / Answer

1)D

2)A

3)B

4)B

5)A

6)D

7)E

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