Electrochemistry 12
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is an oxidation number? | The ionic charge of an element.
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| What is the oxidation number of a pure element? | 0
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| What is an ON rule for hydrogen? | +1 except in a metal hydride then it is -1
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| What is an ON rule for oxygen? | -2 except with OF2 and H2O2
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| What must the ON add to? | The total charge of the compound.
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| If two elements both have a + or - charge: | The element with a higher electronegativity value keeps its charge
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| What is a redox reaction? | A combination of 2 half-reactions
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| What are half-reactions? | Oxidation and Reduction
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| LEOGER is... | Loosing Electrons is Oxidation
Gaining Electrons is Reduction
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| What are the methods for balancing redox reactions? | 1. Half Reaction Method
2. Oxidation Number Method
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| What are the steps in the Half Reaction Method? | 1. break redox into oxidation and reduction
2. Balance:
non hydrogen/oxygen
oxygen using H2O
hydrogen using H+
charge using e-
3. find LCM for e- and multiply
4. cross out spectators
5. add
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| What are the steps in the Oxidation Number Method? | 1. assign ON to each element
2. find 2 elements with changed ON and which reaction each of the two was a part of
3. balance elements that underwent redox(multiply by LCM)
4. find LCM for e-
5. balance e-
6. balance the rest of the reaction
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| How do you create a basic reaction? | add OH-
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| How do you create an acidic reaction? | add H+
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| What is a galvanic cell/voltaic cell? | a battery that changes chemical energy into electrical energy
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| What reaction takes place within a battery? | Redox reaction
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| What is an anode? | Negatively charged electrode where oxidation occurs
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| What is a cathode? | Positively charged electrode where reduction occurs
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| In diagrams where is the anode located? | to the left
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| What is an electrode? | conductor of electricity that takes it into and out of the cell(battery)
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| What is an electrolyte and its use? | substance that conducts electricity when dissolved into water
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| What is a spontaneous reaction? | a reaction that naturally happens due to a favorable change
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| What is the oxidization agent? | elements that accept electrons and undergoes reduction
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| What is the reduction agent? | elements that loose electrons and undergoes oxidation
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| What is a disproportionation reaction | redox
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| What happens to the oxidation number in oxidation/reduction reactions? | oxidation increased ON
reduction decreased ON
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