What is oxidation the process of? What does it involve?
Electron loss. increase in oxidation number
1 of 26
What is reduction the process of? what do it involve?
Electron gain. Decrease in oxidation number
2 of 26
What do all uncombined elements have oxidation numbers of?
0
3 of 26
What do the oxidation numbers of the element sin a compound add up to?
0
4 of 26
What does the oxidation number of a monoatomic ion equal?
its ionic charge
5 of 26
What do the oxidation numbers of the individual elements in a polyatomic ion add up to?
Charge on ion
6 of 26
What do several elements have?
Invariable oxidation numbers in their common compounds
7 of 26
Group 1 metals?
+1
8 of 26
Group 2 metals?
+2
9 of 26
Al?
+3
10 of 26
H?
+1 (except in metal hydrides where it is -1)
11 of 26
F?
-1
12 of 26
Cl,Br,I?
-1 except in compounds with oxygen and fluorine
13 of 26
O?
-2 Except in peroxides h2o2 where it is -1 and in compounds with Fluorine
14 of 26
What is the negative ion in molecules and complex ions?
the more electronegative element
15 of 26
What is the oxidation number of Cl in CaCl2
-1 not -2 as two Cl's and want one atom of element
16 of 26
What do redox and half eqn show?
Parts of chemical eqn involved
17 of 26
What is a reducing agent?
Electron donor. Species that causes another element to reduce. oxidised in reaction
18 of 26
What is Oxidising agent?
Electron acceptor - the species that causes another element to oxidise . is reduced itself in reaction
19 of 26
What should you do when naming oxidising and reducing agents?
Refer to full name of substance not just name of element
20 of 26
How do write a half eqn?
Work out oxidation number for element being oxidised/reduced 2. add electrons to balance charge in o.n (for reduction add e- to reactants and for oxidation add e- to products). 3. check to see sum of charges on both sides are equal)
21 of 26
How do you balance a half eqn where a substance is being oxidised or reducing and contains varying amounts of O
by adding H+, OH- ions and H2O
22 of 26
What do you use in acidic conditions?
H+ and H2O
23 of 26
Steps?
1.balance change in O.N with e- 2. Add H2O is to balance O's 3. Add H+ to balance H in H2O 4. Check charges
24 of 26
How do you make full redox eqn?
Combine a reduction half eqn with oxidation half eqn
25 of 26
How?
Must be equal numbers of electrons in the 2 half eqn's so that electrons cancel out so multiply t get equal electrons then add them together and cancel electrons
26 of 26
Other cards in this set
Card 2
Front
What is reduction the process of? what do it involve?
Back
Electron gain. Decrease in oxidation number
Card 3
Front
What do all uncombined elements have oxidation numbers of?
Back
Card 4
Front
What do the oxidation numbers of the element sin a compound add up to?
Back
Card 5
Front
What does the oxidation number of a monoatomic ion equal?
Comments
No comments have yet been made