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Section 3: Half-Reactions


1.	A balanced reaction that shows only the oxidation process is a ___________. Need a Hint?
		A)	balanced chemical equation
		B)	single-replacement reaction
		C)	half-reaction
		D)	synthesis reaction


2.	Balance the following equation. How many electrons must be transferred between the reducing agent and the oxidizing agent in this reaction? H₂S + HNO₃ → S + NO + H₂0 Need a Hint?
		A)	2
		B)	3
		C)	4
		D)	6


3.	What is the net change in oxidation number of iodine in the following ionic reaction? 2MnO₄^- + I^- + H₂O → 2MnO₂ + IO₃^- + 2OH^- Need a Hint?
		A)	1
		B)	2
		C)	3
		D)	6


4.	Which of the following half-reactions represents oxidation? Need a Hint?
		A)	O₂ + 4e^- → 2O^2-
		B)	Fe³⁺ + 3e^- → Fe
		C)	Fe → Fe²⁺ + 2e^-
		D)	Cu²⁺ + 2e^- → Cu


5.	Complete and balance the following chemical reaction with the smallest set of coefficients. What is the coefficient for iodine in this reaction? HI + HNO₃ → I₂ + NO + H₂O Need a Hint?
		A)	1
		B)	2
		C)	3
		D)	4


6.	Balance the following equation with the smallest whole—number coefficients. How many moles of zinc will react with 6 moles of cobalt(III) chloride? Zn(s) + CoCl₃(aq) → ZnCl₂(aq) + Co(s) Need a Hint?
		A)	2
		B)	3
		C)	6
		D)	9