Bài 32. Hợp chất của sắt (tiếng Anh)

Welcome to 12A2 class!!!
Checking previous lesson
1. What is the feature chemical property of Iron?
2. Write chemical equations if reactions occur when iron react with:
- Oxygen;
- Hydrocloric acid solution;
- Dilute nitric acid solution;
- Cool, concentrated sulfuric acid solution;
- Cooper sulfate solution.
Edit task
3Fe + 2O2 → Fe3O4
0
0
+8/3
-2
Fe + 2HCl ?
FeCl2 + H2
0
don’t react, Fe is inactive
Fe(NO3)3 + NO + 2H2O
Fe + 4HNO3 (d) →
Fe + 6H2SO4 (c,c) →
0
0
+6
+5
+3
+2
+1
+2
0
Fe + CuSO4 ?
FeSO4 + Cu?
0
+2
+2
0
LESSON 32:
COMPOUNDS OF IRON
Fe: 1s2 2s2 2p6 3s2 3p6
4s2 3d6
3d6 4s2
Electron configuration of iron:
Which can be abbreviated:
[Ar] 3d6 4s2
Fe: 1s2 2s2 2p6 3s2 3p6
3d6 4s2
Fe2+: 1s2 2s2 2p6 3s2 3p6 3d6
Fe3+: 1s2 2s2 2p6 3s2 3p6 3d5
Electron configuration:
How many electrons can iron give up?
Ferric ion has semi-saturated electron configuration
I. COMPOUNDS OF IRON (II)
Does ferrous ion easily give up or receive electrons in chemical reaction? Why?
Fe2+ → Fe3+ + 1e
In chemical reations, ferrous ion easily gives up 1 electron to become ferric ion, because it reach a state of semi-saturated.
The featured chemical property of compounds of iron (II) is reducing property.
In addition, ferrous ion can receive 2 electrons to become iron atom.
Fe2+ + 2e → Fe
Ferrous ion express
reducing property when
it react with oxidizers.
Ferrous ion express
oxidizing property when it
react with strong reductants.
1. Ferrous oxide (FeO)
1. Ferrous oxide (FeO)
It is structure of ferrous ion
1. Ferrous oxide (FeO)
It is black solid and not found in nature.
It is unstable.
What subtances can ferrous oxide react with?
Reacts with
acid type 1
Reacts with
acid type 2
Reacts with reductants
3Fe(NO3)3 + NO + 5H2O
3FeO + 10HNO3 (d) →
0
+5
+3
+2
FeO + 2HCl ?
FeCl2 + H2O
+2
+1
+2
+1
Oxidation number of Iron is no change (immutability)
Oxidation number of Iron increases from +2 to +3
So, ferrous ion expresses reducing property.
FeO + CO ?
Fe + CO2
+2
+2
0
+4
Oxidation number of Iron reduces from +2 to 0
So, ferrous ion expresses oxidizing property.
3FeO + NO3- + 10H+ → 3Fe3+ + NO + 5H2O
What method is ferrous oxide prepared?
Ferrous oxide is prepared
by using hydrogen (H2)
or carbon oxide (CO)
reduces ferrous oxide at 500oC
2. Ferrous hydroxide (Fe(OH)2)
Pure ferrous hydroxide (Fe(OH)2) is solid, bluish white, insoluble in water
How does colour of ferrous hydroxide turn, in the air? Why?
In the air, the colour of ferrous hydroxide turn bluish white into red brown. Because it is easily oxidized to ferric hydroxide by oxygen in the air.
I perform an experiment of iron (II) salt solution reacts with alkaline solution and you observe the change colour of ferrous hydroxide.
At first obtained bluish white precipitate, then it will be turned into red-brown precipitate
What method is ferrous hydroxide prepared?
Pure ferrous hydroxide is prepared by pouring iron (II) salt solution in alkaline solution in the absence of air
I perform an experiment of solubility of iron (II) salts in water,
Majority of iron (II) salt dissolves in water.
3. Iron (II) salt
3. Iron (II) salt
FeSO4.7H2O
FeCl2.4H2O
What are the chemical properties of iron (II) salt? When?
- Iron (II) salt express reducing property when it react with oxidizers.
- Iron (II) salt express oxidizing property when it react with strong reductants.
2FeCl2 + Cl2 ?
2FeCl3
+2
0
+3
-1
10FeSO4 + 2KMnO4 + 8H2SO4 ?
5Fe2(SO4)3 + K2SO4 + 2MnSO4 + 8H2O
+2
+3
+7
+2
Oxidation number of Iron increases from +2 to +3
So, ferrous ion expresses reducing property.
Oxidation number of Iron reduces from +2 to 0
So, ferrous ion expresses oxidizing property.
FeCl2 + Mg ?
+2
0
0
+2
Fe + MgCl2
I perform an experiment of ferrous sulfate react with potassium permanganate solution (KMnO4 ) in sulfuric acid solution.
Potassium permanganate solution losts violet and the solution appears yellow.
What method is iron (II) salt prepared?
Iron (II) salt is prepared by Fe (or FeO, Fe(OH)2) reacts with hydrocloric acid or dilute sulfuric acid solution.
Fe + 2HCl ?
FeCl2 + H2
FeO + H2SO4 ?
FeSO4 + H2O
What method to preserve iron (II) salt solution has been prepared?
We mash some iron powder in iron (II) salt solution has been prepared. If iron (II) salt is oxidized to iron (III) salt, iron (III) salt will react iron produce iron (II) salt.
Ferrous ion express
reducing property when
it react with oxidizers.
Ferrous ion express
oxidizing property when it
react with strong reductants.
CONSOLIDATION
What electron configuration of ferrous ion?
C. [Ar]3d4
B. [Ar]3d6
D. [Ar]3d3
A. [Ar]3d5
CONSOLIDATION
A. FeO
What compound of iron has reducing property and oxidizing property?
B. Fe2O3
C. FeCl3
D. Fe(NO3)3
CONSOLIDATION
A. has red-brown precipitate
Pouring slowly sodium hyroxide solution in ferrous sulfate solution. What chemical phenomenon is?
B. has blue precipitate
C. has blue precipitate, then it is dissolved gradually
D. has bluish white precipitate, then it is turned into red-brown precipitate gradually.
CONSOLIDATION
Study Part I. COMPOUNDS OF IRON (II) in the textbooks.
Prepare Lesson 32: Part II. COMPOUNDS OF IRON (III).
Answer question: What is the feature chemical property of iron (III) compounds?
REMINDING
SINCERLY THANKS
FOR
YOUR LISTENING !