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level: Oxidation-Reduction Rxns

Questions and Answers List

Question	Answer
What does the term Redox mean?	REDuction and OXidation
How many reactions are occuring in a redox reaction?	2
What does a reduction reaction mean?	There is a loss of oxygen, gain of electrons and decrease in oxidation number.
What does a oxidation reaction mean?	There is a gain of oxygen, loss of electrons and increase in oxidation number.
What is the oxidation number H in H2O?	+1
Oxygen always has an oxidation number of...	-2
Is calcium oxidized or reduced in the following reaction? 2CaO--> 2Ca + O2	Reduced
In the reaction 2Ca(s) + O2(g) --> 2CaO(s), calcium is __________	Oxidised
In the reaction Zn + H2O --> ZnO2 + H2 which element, if any, is oxidized?	Zinc
What substance is oxidized in the following reaction? 4Fe + 3O2 --> 2Fe2O3	Iron
If in a reaction, copper is reduced; its number of electrons has:	increased
If an atom loses electrons during a chemical reaction, the atom was:	oxidised
What is the oxidation number of N in NO2-1?	+3
What is oxidation number of Cr in Cr2O72-?	+6
What is oxidation number of Fe in FeO ?	+2
What is oxidation number of O in O2 ?	0