Another type of displacement reaction is with Metal Oxides and metals. Again the same principle applies. The more ‘reactive’ metal, Displaces the less reactive one.
Aluminium + Iron Oxide → Aluminium Oxide + Iron.
2Al + Fe2O3 → Al2O3 + 2Fe
The Aluminium metal is more reactive than the iron metal. This means Iron is Displaced by the Aluminium.
When we combine Aluminium and iron oxide, we create a Thermit reaction. To start it, we need a lot of heat, however once the reaction starts, the heat produced can melt iron (Over 1200 degrees Celsius).
We call this an Exothermic reaction, because we are giving off heat.
Other metal and metal oxide pairs aren’t as reactive, but still react.
Iron + Copper Oxide → Iron Oxide + Copper
2Fe + 3CuO → Fe2O3 + 3Cu
In the above reaction, iron displaces copper from the oxide.
Questions
1. Explain what is meant by the term Displacement and give one example
2. What is a Diatomic molecule and give one example
3. The sentence bellow has 5 errors in it. Re-
In a displacement reaction, a less reactive metal pushes out a more reactive metal from its compound. For example, iron displaces aluminium from aluminium oxide
4. Using a real life example, draw a cartoon strip to illustrate displacement. (Similar to the example in the title).
5. Fill in the following blanks
a. Zinc + Copper sulphate → _______ Sulphate + _______
b. Iron + Zinc Chloride → __________ Chloride + _______
c. Aluminium + Copper Oxide → ________ Oxide + ________
d. Potassium + Lithium Oxide → _______ ______ + ______
e. Zinc + Lead Oxide → _______ ______ + ______
f. Copper + Silver nitrate → _______ ______ + ______
g. Calcium + Aluminium Sulphate → _______ ______ + ______
h. Calcium + Iron Oxide → _______ ______ + ______
i. Potassium + _______ Oxide → ______ _____ + Aluminium
j. Lead + Lithium Chloride → ________ _______ + _______
k. Calcium + Sodium Chloride → ________ _______ + _____
l. ______ + Magnesium Oxide → Lithium Oxide + Magnesium
m. Zinc + ______ Chloride → ______ ______ +Lead
n. ________ + ______ ______ → Copper oxide + Silver
o. _______ + Sodium ______ → Potassium Sulphate + _______
p. _______ + ______ _______ → Iron Chloride + Iron
q. ______ + _____ _____ → Zinc nitrate + Lead
6. Balance the following equations
a. Al + Fe2O3 → Al2O3 + Fe
b. Zn + Fe2O3 → Zn2O3 + Fe
c. Mg + Fe2O3 → Mg2O3 + Fe
d. Fe + CuO → Fe2O3 + Cu
e. Li + CuO → Li2O3 + Cu
7. Fill in the blanks
a. Zinc + Copper Sulphate → _______ Sulphate + _______
__ + CuSO4 → ZnSO4 + __
b. Potassium + Lithium Oxide → _______ ______ + ______
___ + Li2O → ___ + ___
c. Calcium + Sodium Chloride → ________ _______ + _____
____ + NaCl → CaCl2 + _____
d. __________ + Iron Oxide → Aluminium _____ + ______
Al + ____ → ______ + Fe
e. Silver + ______ _____ → Lead Sulphate + ______
___ + PbSO4 → ___ + Ag
