Electrochemistry Word Scramble
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Question | Answer |
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 |
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