Balancing Oxidation-Reduction Equations

In the reaction Zn + H+ Zn2+ + H2, Zn is oxidized and H is reduced. How many electrons would be produced and used in the balanced half-reactions? Complete the balanced half-reactions:

2 2H+ +2e- ->1H2 1Zn->1Zn2+ +2e-

Which reactions are oxidation-reduction reactions? Check all that apply.

2Na+Cl2—>2NaCl Cu+2A个NO3—>Cu（NO3）2+2Ag CH4+2Ｏ2—>CO2+H2O

You are given the reaction Cu + HNO3 → Cu(NO3)2 + NO + H2O. Half-reactions: Complete the final balanced equation based on the half-reactions.

3Cu +8HNO3 ->3Cu(NO3)2 +2NO +4H2O

Given the two half-reactions, what must be done in the next step before the reaction can be balanced? How many electrons are produced/used in this redox reaction when it is balanced? Au3+->Au |`->|2

6

How many electrons would be exchanged in the iron-oxygen redox reaction? electrons

6

You are given the reaction Cu + HNO3 Cu(NO3)2 + NO + H2O.Which pair of half-reactions represents the balanced half-reactions for the reaction?

A

Consider the reaction Cu + AgNO3 Ag + CuNO3. Which element is reduced? Which element is the oxidizing agent?

Ag Ag

Given the reaction C + O2 CO2 which pair of reactions represents the two half-reactions?

C → CO₂ + 4e₋ O₂ + 4e₋→ CO₂

In the reaction Mg + 2HCl MgCl2 + H2 which element's oxidation number does not change?

Cl

You are given the reaction Cu + HNO3 Cu(NO3)2 + NO + H2O. Which element is oxidized? Which element is reduced?

Cu N

Which of these is an oxidation half-reaction?

Fe+O2—>Fe2O3

Consider this reaction: Fe2O3 + S Fe + SO2 Reduction half-reaction: 2Fe+3 + 6e- 2Fe Oxidation half-reaction: S S+4 +4e- After balancing the chemical equation, what are the coefficients for these compounds? Fe SO2

Fe->4 SO2->3

Consider this reaction: H2S + HNO3 S + NO + H2O Reduction half-reaction: N+5 + 3e- N+2 Oxidation half-reaction: S-2 S + 2e-After balancing the chemical equation, what are the coefficients for these compounds? H2S HNO3

H2S->2 HNO3->3

Use this oxidation-reduction reaction to answer questions about half-reactions: Mg +2HCl->MgCl2+H2 Classify these half-reactions by typing in "O" for "oxidation half-reaction," "R" for "reduction half-reaction," and "N" for "neither."

HCl->MgCl2 N Mg->MgCl2 +2e` O 2HCl +2e`->H2 R

In the reaction which element is reduced in the reaction?

O2

Given the two half-reactions, what must be done in the next step before the reaction can be balanced?

Show the number of electrons being lost or gained.

Given the two half-reactions, what must be done in the next step before the reaction can be balanced? Au3+->Au |`->|2

Show the number of electrons being lost or gained.

Consider the reaction 2Na + Cl2 → 2NaCl. Na is________and is the________

oxidized reducing agent