Lab: Measuring pH — Unit test

Question 1

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

Revolt · Accepted Answer

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

Question 2

A student balances the following redox reaction using half-reactions.How many electrons will be lost in all?

Revolt · Accepted Answer

6

Question 3

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

Revolt · Accepted Answer

identifying the half reactions

Question 4

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?

Revolt · Accepted Answer

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.

Question 5

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

Revolt · Accepted Answer

determining the half reactions of chemical equations

Question 6

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

Revolt · Accepted Answer

to identify the half reactions for the equation

Question 7

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

Revolt · Accepted Answer

2 upper C r superscript 3 plus (a q) plus 6 upper C l superscript minus (a q) right arrow 2 upper C r (s) plus 3 upper C l subscript 2 (g).

Question 8

Which equation describes a reduction?

Revolt · Accepted Answer

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

Question 9

Consider the half reaction below.Which statement best describes what is taking place?

Revolt · Accepted Answer

Copper is being reduced.

Lab: Measuring pH — Unit test Answers

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