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29 Cards in this Set
- Front
- Back
When charges of species in a reaction change, then it is a ______
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redox
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Redox means...
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reduction & oxidation
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Reduction means that charges do what?
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go down, from a higher # to a lower #
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Oxidation means that charges do what?
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go up, form a lower # to a higher #
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The charge on "free elements" (not ions) are all....
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zero
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A 0 charge to a +2 charge is a(n)…
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oxidation
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A +1 to a -3 charges is a(n)…
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reduction
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If an oxidation occurs, then a ____ also occurs.
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reduction
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The substance that contains the species that is oxidized is called the _____
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reducing agent
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The substance that contains the species that is reduced is called the ____
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oxidizing agent
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Oxidation occurs at the (location) ____. Anions migrate to it.
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anode
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Reduction occurs at the (location) _____. Cations migrate to it.
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cathode
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OIL RIG is...
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a mnemonic device for remembering what happens in redox
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In the mnemonic OIL RIG, OIL stands for...
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Oxidation Is Loss of electrons
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In the mnemonic OIL RIG, RIG stands for...
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Reduction Is Gain of electrons
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What happens with electrons in oxidation?
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Lost a products
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What happens with electrons in reduction?
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Gained as reactants
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The species that does not undergo redox is called....
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Spectator Ions
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The oxidation number of oxygen in a compound will nearly always be...
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-2
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The oxdiation number of hydrogen ion in a compound will nearly always be...
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+1
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The oxidation number of IA elements will always be...
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+1
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The oxdation number of IIA elements will always be...
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+2
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The oxidation numbers of a compound must algebraically add up to ....
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zero
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In a reduction half reaction, the electrons that are gained, must be written on the ____ of the arrow.
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left
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In an oxidation half reaction, the electrons that are lost, must be written on the ____of the arrow.
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right
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Double replacement reactions are _____ redox reactions
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never
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If you change the mnemonic device to OILa cRIG, it helps you remember that oxidation occurs at the _____ and reduction occurs at the ___. |
anode cathode |
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What is the oxidation number of elemental chlorine (Cl₂), hydrogen (H₂), or oxygen(O₂) or other diatomic free elements? |
zero |
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What is the oxidation number of S in sulfuric acid? |
+6 |