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20 questions
A redox reaction is NOT:
all reactions
a combustion reaction
a reduction-oxidation reaction
a reaction in which electrons are transferred from one atom to another
Combustion and single-replacement reactions are __________ redox reactions.
always
never
sometimes
mostly
_____________ synthesis and decomposition reactions involve the transfer of electrons.
All
Most
No
Some
Defined as the gain of electrons.
oxidation
redox
reduction
LEO GER
Defined as the loss of electrons.
oxidation
reduction
redox
OIL RIG
Cl2 + 2e- --> 2Cl - is an example of:
a chemical reaction
redox
oxidation
reduction
These keep track of the movement of electrons.
(+) and (-) signs
oxidation numbers
coefficients
subscripts
An increase in oxidation number.
more acidic
reduction
less basic
oxidation
A decrease in oxidation number.
concentrated
reduction
oxidation
dilute
What is the oxidation number of C in SrCO3?
-4
+2
-6
+4
What is the oxidation number of Cr in Cr2O72- ?
+14
+6
-6
-14
Substance that oxidizes another substance by accepting its electrons.
reducing agent
oxidation number
combustion
oxidizing agent
Substance that reduces another substance by losing electrons.
reducing agent
half-reaction
electronegative atom
oxidizing agent
What is a half-reaction of this equation, Na + Cl --> NaCl ?
Cl + e- --> Cl-
Cl - e- --> Cl-
Na --> Na + e-
Na° + Cl°--> Na+1Cl-1
What is the reducing agent here: N2 + 3H2 --> 2NH3
N2
H2
NH3
2NH3
a compound having +2 oxidation state of O is
H2O
H2O2
OF2
O2F2
What will be the result of the following:
Br2 + NaF ->
bromine will replace Na
Na will replace Br
Br will replace F
no reaction will occur
Which change is an oxidation?
FeO to Fe2O3
Fe2O3 to FeO
H2O2 to H2O
H2O to H2
In the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________
Reduced
Synthesized
Oxidized
None of the above
What substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3
Iron
Fluorine
Oxygen
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