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Unit 12 Electrochemistry
Chemistry I Accelerated
Part I. REVIEW: Assigning Oxidation Numbers
Complete the following in the space provided
1. The oxidation number of a free, neutral element is ________________.
2. Elements in group 1 of the periodic table have an oxidation number of _______________.
3. Elements in group 2 of the periodic table have an oxidation number of _______________.
4. In most compounds, aluminum has an oxidation number of _______________.
5. Fluoride has an oxidation number of _______________.
6. Hydrogen has an oxidation number of _______________ when combined with non-metals.
7. Oxygen has an oxidation number of _______________ in most compounds.
8. The sum of individual oxidation numbers of all atoms in a compound is ___________.
For each of the following compounds assign the oxidation number for each element.
1.
Sulfuric acid
2.
Barium flouride
3.
Sulfur trioxide
4.
Phosphoric acid
5.
Tetraphosphorus hexaoxide
6.
Potassium oxide
7.
Calcium dihydrogen phosphate
8.
Barium hydroxide
9.
Ammonia
10.
Cobalt(II) hydroxide
11.
Iron(III) chloride
12.
Magnesium nitride
13.
Sodium phosphate
14.
Barium sulfate
15.
Zinc carbonate
16.
Hydrogen peroxide
17.
Sulfur dichloride
18.
Chromium(III) chloride
19.
Mercury(II) sulfate
20.
Dinitrogen pentoxide
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Part II. REVIEW: Identifying the Oxidizing and Reducing Agents
In the following reactions, identify which element is oxidizing agent and which is the reducing
agent.
1.
Carbon plus chlorine produces carbon tetrachloride
2.
Phosphorus plus chlorine in a synthesis reaction
3.
Lead plus hydrochloric acid produces lead(II) chloride plus hydrogen gas
4.
Carbon dioxide plus magnesium produces carbon plus magnesium oxide
5.
Potassium dichromate plus hydrogen iodide produces potassium iodide plus chromium (III)
iodide plus Iodine gas plus water
6.
Copper plus silver nitrate produces copper(II) nitrate plus silver
Part III. Balancing Redox Reactions
Balance the following reactions using the half-reaction method. The first one is outlined for you.
1. Aqueous nitrous acid plus aqueous hydroiodic acid yields nitrogen monoxide gas plus iodine
gas.
a. Write the unbalanced formula equations
b. The element oxidized is ____________.
c. The element reduced is _____________.
d. Write the balanced oxidation half-reaction
e. Write the balanced reduction half-reaction
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f. Write the net-ionic equation
g. Write the complete balanced equation
2. Solid copper plus aqueous nitric acid yields aqueous copper (II) nitrate plus nitrogen dioxide
gas plus liquid water.
3. Solid tetrarsenic hexaoxide plus chlorine gas plus liquid water yields aqueous arseneic acid
(H3AsO4) plus aqueous hydrochloric acid.
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4. Solid phosphorus (P4) plus liquid water yields aqueous pyrophosphorus acid (H2PO2) plus
phosphorus trihydride gas.
5. Laughing gas (dintrogen monoxide) plus aqueous bleach (sodium hypochlorite) yields
aqueous sodium chloride plus aqueous sodium nitrite. Note: This is in basic solution.
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Challenge Problems
1. Aqueous sodium chromate plus aqueous hydrochloric acid yields aqueous chlorous acid
plus aqueous chromium (III) chloride. Hint: There is another compounds that are needed
to balance the reaction and you need to figure them out as you solve the problem.
2. Aqueous sodium permanganate (NaMnO4) plus solid zinc plus liquid water yields solid
manganese (IV) oxide plus solid zinc hydroxide. (Note: The reaction takes place in basic
solution)
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