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Balance each reaction. Classify each reaction. Then decide if it is a REDOX reaction or not



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Balance each reaction. Classify each reaction. Then decide if it is a REDOX reaction or not.

Classification Redox?

3.) _2__Al + __3_Cu(NO3)2 Cu + __2_Al(NO3)3 single replacement YES

4.) ___BaCl2 + ___Na2CrO4 BaCrO4 + __2_NaCl double replacement NO

5.) ___H3PO4 + _3__KOH H2O + ___K3PO4 neutralization (double replacement) NO

6.) ___CaCO3  ___CaO + ___CO2 decomposition NO

7.) ___N2 + _3__H2  _2__NH3 synthesis YES

8.) ___CH4 + ___O2  ___CO2 + ___H2O combustion YES

9.) A redox reaction is a reaction in which



  1. oOval 51nly reduction occurs 3. reduction and oxidation occur at the same time

  2. only oxidation occurs 4. reduction occurs first and then oxidation occurs

10.) Oxidation-reduction reactions occur because of the competition between particles for

  1. neutrons 2. electrons 3. protons 4. ions


REHAB-Assignment #B: Redox Reaction Skill Drills (cont’d)

Skill #3 – Identifying Species Oxidized & Reduced (Text Reference: p. 633 – 634)

The element which is oxidized gains in oxidation number (becomes more positive)

The element which is reduced loses in oxidation number (becomes less positive).

Reduction (“G.E.R.”)



Group 32
-5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5

Oxidation (“L.E.O.”)



    1. WOval 46hich change occurs when a Sn2+ ion is oxidized to Sn4+?

1. two electrons are lost 2. two electrons are gained 3. two protons are lost 4. two protons are gained

2Oval 47.) When a substance is oxidized, it

1. loses protons. 2. gains protons. 3. loses electrons. 4. gains electrons.

3.) Given the reaction: Fe(s) + Sn4+(aq) Fe2+(aq) + Sn2+(aq)

TOval 48he substance reduced is:

1. Fe(s) 2. Sn4+(aq) 3. Fe2+(aq) 4. Sn2+(aq)

4Oval 49.) Given the reaction:  2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g )
Which substance undergoes oxidation?

1. Na 2. NaOH 3. H2 4. H2O

5.) In the reaction: Cu + 2Ag+ Cu2+ + 2Ag

The Cu atoms are oxidized when they lose 2 electrons.

(oxidized or reduced?) (gain or lose?) (how many?)

6.) In any redox reaction, the substance that undergoes reduction will gain (lose or gain?) electrons and as a result the value of the oxidation number will decrease (increase or decrease?).


REHAB-Assignment #B: Redox Reaction Skill Drills (cont’d)

7.) Given the reaction: Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2 (g)

WOval 52hich statement correctly describes what occurs when this reaction takes place in a closed system?



  1. Atoms of Zn(s) lose electrons and are oxidized. 3. There is a loss of mass.

  2. Atoms of Zn(s) gain electrons and are reduced. 4. There is a gain of mass.

8.) Given the equation: C(s) + H2O(g ) CO(g) + H2(g
Which species undergoes reduction?

1. C(s) 2. H+ 3. C2+ 4. H2(g)

9.) Given the reaction: Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s)
Which particles must be transferred from one reactant to the other reactant?

1. ions 2. neutrons 3. protons 4. electrons

1Oval 580.) Given the redox reaction: 2I-(aq) + Br2(l) 2Br-(aq) + I2(s)
What occurs during this reaction?

1. The I- ion is oxidized, and its oxidation number increases.

2. The I- ion is oxidized, and its oxidation number decreases.

3. The I- ion is reduced, and its oxidation number increases.

4. The I- ion is reduced, and its oxidation number decreases.



Potential Energy Diagram NOTES


Potential energy diagrams show conservation of energy!
Exothermic Example: S(s) + O2 (g)  SO2 (g) + energy

High PE  Low PE + heat



Total E before = Total E after



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