Question

iii)Explain the following terms with examples.

a)Balanced equations

b) Combination reaction

c) Displacement reaction.​

Answer 1

Displacement reaction :
A single-displacement reaction, also known as a single-replacement reaction, is a reaction by which one
(or more) element(s) replaces an/other element(s) in a compound. It can be represented generally as:
A+B−C→A−C+B
All simple metal with acid reactions are single displacement reactions. For example, the reaction
between magnesium, Mg, and hydrochloric acid, HCl, forms magnesium chloride, MgCl
2
​
, and hydrogen,
H
2
​
.
Mg(s)+2HCl(aq)→MgCl
2
​
(aq)+H
2
​
(g)
Decomposition reaction :
A decomposition reaction is a type of chemical reaction where one reactant yields two or more
products.
The general form for a decomposition reaction is
AB→A+B
Water can be separated by electrolysis into hydrogen gas and oxygen gas through the decomposition
reaction: 2H
2
​
O→2H
2
​
+O
2
​

Another example is the spontaneous decomposition of hydrogen peroxide into water and oxygen: 2
H
2
​
O
2
​
→2H
2
​
O+O
2
​

The decomposition of potassium chlorate into potassium chloride and oxygen is yet another example:
2KClO
3
​
→2KCl+3O
2
​

Combination reaction :
A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements
or compounds (reactants) combine to form a single compound (product). Such reactions may be
represented by equations of the following form : X+Y→XY.
Formation of calcium oxide by the combination elements calcium and oxygen.
2Ca+O
2
​
→2CaO
Formation of ammonia by the combination of elements nitrogen and hydrogen.
N
2
​
+3H
2
​
→2NH
3
​

Answer 2

Answer:

1.endothermic:-

it is a type of reaction held by temperature  

2.combination:-

it is a type of reaction held by two liquid or gas

3.balanced:-

when reaction is equal in both sides

4.displacement:-

when any molecule displace any molecule

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