Answers NY-Chemistry Term 1 HillcrestBalancing Oxidation-Reduction Equations

Balancing Oxidation-Reduction Equations Answers

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Which is an important step in the alternate method for balancing equations in redox reactions?

indicating the types of bonds found in the molecules

determining the speed at which reactions take place

determining the half reactions of chemical equations

indicating the temperature at which the reaction occurs

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Equations can be balanced by using the half-reaction method. Which step should be completed immediately after finding the oxidation states of atoms?

inserting the coefficients

balancing the half reactions

identifying the half reactions

inspecting the number of atoms

Consider the chemical reaction below. Zn(s) + 2H+(aq) Zn2+(aq) + H2(g)Which half reaction correctly represents reduction for this equation?

Zn(s) Zn2+(aq) + 2e–

2H+(aq) + 2e– H2(g)

Zn(s) Zn2+(aq) + e–

2H+(aq) + e– H2(g)

A student is asked to balance an equation by using the half-reaction method. He determines the two half reactions as shown below.What should he write as the final, balanced equation?

Upper C l subscript 2 plus 2 upper B r superscript minus right arrow upper B r subscript 2 plus 2 upper C l superscript minus.

Upper C l subscript 2 plus 2 upper B r superscript minus, plus 2 e superscript minus right arrow upper B r subscript 2 plus 2 upper C l superscript minus.

Upper C l subscript 2 plus 2 upper B r superscript minus right arrow upper B r subscript 2 plus 2 upper C l superscript minus, plus 2 e superscript minus.

Upper C l subscript 2 plus upper B r superscript minus plus 2 e superscript minus right arrow upper B r subscript 2 plus upper C l superscript minus, plus 2 e superscript minus.

What is the purpose of finding oxidation states in the half-reaction method for balancing equations?

to use as coefficients in the final equation

to identify the half reactions for the equation

to make sure the equation is balanced electrically

to find the electrons that are needed for each side of the equation

Which statement is true of the following reaction?

It is balanced for oxidation state and for number of atoms.

It is not balanced for oxidation state or for number of atoms.

It is not balanced for oxidation state but is balanced for number of atoms.

It is balanced for oxidation state but is not balanced for number of atoms.

Consider the redox reaction below.Which half reaction correctly describes the oxidation that is taking place?

Upper Z n superscript 2 plus (s) plus 2 e superscript minus (a q) right arrow upper Z n (s).

Upper Z n (s) right arrow upper Z n superscript 2 plus (a q) plus 2 e superscript minus.

2 upper H superscript plus, plus 2 e superscript minus right arrow upper H subscript 2.

Upper H subscript 2 plus 2 e superscript minus right arrow 2 upper H superscript plus.

Which equation describes a reduction?

Upper M g (s) right arrow Uper M g superscript 2 plus (a q) plus 2 e superscript minus.

2 upper C l plus 2 e superscript minus right arrow 2 upper C l superscript minus.

Upper N a (s) right arrow upper N a superscript plus (a q) plus e superscript minus.

Upper A l (s) right arrow upper A l superscript 3 plus (a q) plus 3 e superscript minus.

The information below describes a redox reaction.What is the coefficient of silver in the final, balanced equation for this reaction?

Which half-reaction correctly describes an oxidation?

Upper C a (s) plus 2 e superscript minus right arrow upper C a superscript 2 plus (a q).

Upper B r subscript 2 plus 2 e superscript minus right arrow 2 upper B r superscript minus.

Upper N a superscript plus (a q) right arrow upper N a (s) plus e superscript minus.

Upper C r (s) right arrow upper C r superscript 3 plus (a q) plus 3 e superscript minus.

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Balancing Oxidation-Reduction Equations Answers

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