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Electrochemistry

Electrochemistry 12

QuestionAnswer
What is an oxidation number? The ionic charge of an element.
What is the oxidation number of a pure element? 0
What is an ON rule for hydrogen? +1 except in a metal hydride then it is -1
What is an ON rule for oxygen? -2 except with OF2 and H2O2
What must the ON add to? The total charge of the compound.
If two elements both have a + or - charge: The element with a higher electronegativity value keeps its charge
What is a redox reaction? A combination of 2 half-reactions
What are half-reactions? Oxidation and Reduction
LEOGER is... Loosing Electrons is Oxidation Gaining Electrons is Reduction
What are the methods for balancing redox reactions? 1. Half Reaction Method 2. Oxidation Number Method
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
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
How do you create a basic reaction? add OH-
How do you create an acidic reaction? add H+
What is a galvanic cell/voltaic cell? a battery that changes chemical energy into electrical energy
What reaction takes place within a battery? Redox reaction
What is an anode? Negatively charged electrode where oxidation occurs
What is a cathode? Positively charged electrode where reduction occurs
In diagrams where is the anode located? to the left
What is an electrode? conductor of electricity that takes it into and out of the cell(battery)
What is an electrolyte and its use? substance that conducts electricity when dissolved into water
What is a spontaneous reaction? a reaction that naturally happens due to a favorable change
What is the oxidization agent? elements that accept electrons and undergoes reduction
What is the reduction agent? elements that loose electrons and undergoes oxidation
What is a disproportionation reaction redox
What happens to the oxidation number in oxidation/reduction reactions? oxidation increased ON reduction decreased ON
Created by: da786