Redox Reactions Flashcards
What is oxidation?
Gain of oxygen
Loss of electrons
What is reduction?
Loss of oxygen
Gain of hydrogen
Gain of electrons
What is the oxidation number?
The charge an atom would have if it was composed of ions
What are the rules for oxidation numbers in compounds?
Overall charge is 0
Sum of oxidation numbers must equal 0
What are the rules for oxidation numbers in molecular ions?
Sum of the oxidation numbers must equal the overall charge on the ion
What is the oxidation number for an uncombined element?
0
What is the oxidation number for combine oxygen?
-2
What is the oxidation number for combined oxygen in peroxide’s?
-1
What is the oxidation number for combined hydrogen?
+1
What is the oxidation number for combined hydrogen in metal hydrides?
-1
What is the oxidation number for a simple ion?
The charge on the ion
What is the oxidation number for combined fluoride?
-1
What is a redox reaction?
Where both oxidation and reduction occur within a reaction
What happens in oxidation or reduction in terms of oxidation number?
Oxidation - increase in oxidation number
Reduction - decrease in oxidation number
What happens when metals react with acids in terms of redox?
Metal is oxidised
Hydrogen is reduced (forms hydrogen gas)