Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s...
Transcript of Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s...
![Page 1: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/1.jpg)
Redox Reactions.
Oxidation
Reduction
100’s of free ppt’s from www.pptpoint.com library
![Page 2: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/2.jpg)
GCSE
Oxidation:
•Gain of oxygen
•Loss of electrons
Reduction:
•Loss of oxygen
•Gain of electrons
Increase in
oxidation
number
Decrease in
oxidation
number
![Page 3: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/3.jpg)
4 Experiments:
1. Burning magnesium
2. Copper in silver nitrate solution
3. Chlorine solution and potassium
iodide solution
4. Exploding hydrogen
•Word equation
•Balanced symbol equation
![Page 4: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/4.jpg)
2Mg(s) + O2(g) 2MgO(s)
Oxidised –
gains oxygen
Must be a redox!
Mg Mg2+
O O2-
Put the
e- in.
+2e-
+2e-
Oxidised – loss of e-
Reduced – gain of e-
![Page 5: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/5.jpg)
Cu(s) + 2AgNO3(aq) Cu(NO3 )2(aq) + 2Ag(s)
Ag+ Ag
Cu Cu2+
Complete the half-
equations
+e-
+2e-
Oxidised?
Reduced?
Oxidised – loss of e-
Reduced – gain of e-
![Page 6: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/6.jpg)
Try Question 1.
![Page 7: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/7.jpg)
H2(g) + ½ O2(g)H2O(g)
Covalent!
No H+ or OH-
Need a new
definition.
![Page 8: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/8.jpg)
GCSE
Oxidation:
•Gain of oxygen
•Loss of electrons
Reduction:
•Loss of oxygen
•Gain of electrons
Increase in
oxidation
number
Decrease in
oxidation
number
![Page 9: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/9.jpg)
Oxidation NumbersOxidation Numbers
• The oxidation number of an atom in an
element is zero.
E.g. Mg in Mg, O in O2.
![Page 10: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/10.jpg)
Oxidation NumbersOxidation Numbers
• The oxidation
numbers of atoms
in a compound add
up to zero.
F -1
O -2
H +1
Cl -1
Oxidation state of
C in CO2?
? – 4 = 0
? = +4Put the +!
![Page 11: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/11.jpg)
Oxidation NumbersOxidation Numbers
• The oxidation
numbers of atoms
in a compound add
up to zero.
F -1
O -2
H +1
Cl -1
Oxidation state of
Mg in MgCl2?
+2
![Page 12: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/12.jpg)
Oxidation NumbersOxidation Numbers
• The oxidation
numbers of atoms
in a compound add
up to zero.
F -1
O -2
H +1
Cl -1
Oxidation state of
N in NH3?
-3
![Page 13: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/13.jpg)
Oxidation NumbersOxidation Numbers• The oxidation
numbers of atoms
in an ion add up to
the charge on the
ion.
F -1
O -2
H +1
Cl -1
Oxidation state of
S in SO42-?
? – 8 = -2
? = +6
![Page 14: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/14.jpg)
Oxidation NumbersOxidation Numbers• The oxidation
numbers of atoms
in an ion add up to
the charge on the
ion.
F -1
O -2
H +1
Cl -1
Oxidation state of
S in S2-?
-2
![Page 15: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/15.jpg)
Oxidation NumbersOxidation Numbers• The oxidation
numbers of atoms
in an ion add up to
the charge on the
ion.
F -1
O -2
H +1
Cl -1
Oxidation state of
N in NH4+?
-3
![Page 16: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/16.jpg)
Try Question 2.
![Page 17: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/17.jpg)
H2(g) + ½ O2(g)H2O(g)
Covalent!
No H+ or OH-
Need a new
definition.
![Page 18: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/18.jpg)
GCSE
Oxidation:
•Gain of oxygen
•Loss of electrons
Reduction:
•Loss of oxygen
•Gain of electrons
Increase in
oxidation
number
Decrease in
oxidation
number
![Page 19: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/19.jpg)
H2(g) + ½ O2(g)H2O(g)
Covalent!
No H+ or OH-
Need a new
definition.
+10
-20O
H
![Page 20: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/20.jpg)
H2(g) + ½ O2(g)H2O(g)
+10
-20O
H
Oxidised?
H – increase
in oxidation
number
Reduced?
O – decrease
in oxidation
number
![Page 21: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/21.jpg)
Try Question 3.
![Page 22: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/22.jpg)
Oxidation Numbers and namesOxidation Numbers and names
• To avoid any confusion when an element can have
several oxidation numbers, the oxidation number is
usually mentioned in the compound’s name.
In names like “elementate(X)”, the number refers to
“element” and not the associated oxygens.
• So if we look at some examples , we get the following
names:-
KMnO4 potassium manganate(VII)
NaClO3 sodium chlorate(V)
POCl2F phosphorus(V) oxydichlorofluoride
NaH2PO3 sodium dihydrogenphosphate(III)
K2Cr2O7 potassium dichromate(VI)
Check the
numbers.
![Page 23: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/23.jpg)
Try any 3 in Question 7.
![Page 24: Redox Reactions. Reduction Oxidation Reaction.pdf · Redox Reactions. Oxidation Reduction 100’s of free ppt’s from library](https://reader035.fdocuments.net/reader035/viewer/2022062219/5ed28a50af2f306b9a013e61/html5/thumbnails/24.jpg)
Well done!