class 10 science chapter 1 notes
Answers
Ca: a=3c
C: a=d
O: 3a+4b=8c+3d
H: 3b=2d
P: b=2c
Let’s set c=1
Then a=3 and
d = a = 3
b = 2c = 2
So a=3; b=2; c=1; d=3
The balanced equation is
3CaCO3 + 2H3PO4 → Ca3 (PO4)2 + 3H2CO3
To know more about Balancing of a Chemical Equation, visit here.
Chemical Reactions and Equations II
Types of chemical reactions
Taking into consideration different factors, chemical reactions are grouped into multiple categories.
Few examples are:
● Combination
● Decomposition
● Single Displacement
● Double displacement
● Redox
● Endothermic
● Exothermic
● Precipitation
● Neutralisation
To know more about Types of Chemical Reaction, visit here.
Combination reaction
In a combination reaction, two elements or one element and one compound or two compounds combine to give one single product.
Chemical Reactions and Equations-4
Decomposition reaction
A single reactant decomposes on the application of heat or light or electricity to give two or more products.
Types of decomposition reactions:
a. Decomposition reactions which require heat – thermolytic decomposition or thermolysis.
Chemical-Reactions-and-Equations-5
Thermal decomposition of HgO
b. Decomposition reactions which require light – photolytic decomposition or photolysis.
Chemical-Reactions-and-Equations-6
Photolytic decomposition of H2O2
c. Decomposition reactions which require electricity – electrolytic decomposition or electrolysis.
Electrolytic decomposition of H2O
For More Information On Decomposition Reaction, Watch The Below Video:
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Displacement reaction
More reactive element displaces a less reactive element from its compound or solution.
Chemical Reactions and Equations-7
Double displacement reaction
An exchange of ions between the reactants takes place to give new products.
For example, Chemical Reactions and Equations-8
Precipitation reaction
An insoluble compound called precipitate forms when two solutions containing soluble salts are combined.
Chemical Reactions and Equations- 9
Chemical-Reactions-and-Equations-10
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Redox reaction
Oxidation and reduction take place simultaneously.
Oxidation: Substance loses electrons or gains oxygen or loses hydrogen.
Reduction: Substance gains electrons or loses oxygen or gains hydrogen.
Oxidising agent – a substance that oxidises another substance and self-gets reduced.
Reducing agent – a substance that reduces another substance and self-gets oxidised