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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

only reduction occurs 3. reduction and oxidation occur at the same time
only oxidation occurs 4. reduction occurs first and then oxidation occurs

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

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.”)

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

Oxidation (“L.E.O.”)

Which 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

2 Oval 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)

T Oval 48 he substance reduced is:

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

4 Oval 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)

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

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

1 Oval 58 0.) 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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