Give pics of your chemistry ch1 chemical reactions and equations please
please . i mark brainliest !!!Send pic of your notebook , CBSE chemistry ch1 class 10
Answers
Explanation:
Chapter 1
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 Chemical Reactions, visit here.
Chemical Reactions and Equations I
Word equation
A word equation is a chemical reaction expressed in words rather than chemical formulas. It helps identify the reactants and products in a chemical reaction.
For example,
Sodium + Chlorine → Sodium chloride
The above equation means: “Sodium reacts with chlorine to form sodium chloride.”
and products is known as a chemical equation.
Chemical Reactions and Equations-3
• For solids, the symbol is “(s)”.
• For liquids, it is “(l)”.
• For gases, it is “(g)”.
• For aqueous solutions, it is “(aq)”.
• For gas produced in the reaction, it is represented by “(↑)”.
• For precipitate formed in the reaction, it is represented by “(↓)”.
To know more about Chemical Equation, visit here.
Short-cut technique for balancing a chemical equation
Example:
aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3
Set up a series of simultaneous equations, one for each element.
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:
40,090
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
To know more about Precipitation Reaction, visit here.
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.
Chemical Reactions and Equations-11
To know more about Redox Reaction, visit here.
Endothermic and exothermic reaction
Exothermic reaction – heat is evolved during a reaction. Most of the combination reactions are exothermic.
Al + Fe2O3 → Al2O3 + Fe + heat
CH4 + 2O2 → CO2 + 2H2O + heat
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Endothermic – Heat is required to carry out the reaction.
6CO2 + 6H2O + Sunlight → C6H12O6 + 6O2
Glucose
Most of the decomposition reactions are endothermic.
To know more about Endothermic Reaction, visit here.
Corrosion
Gradual deterioration of a material, usually a metal, by the action of moisture, air or chemicals in the surrounding environment.
Rusting:
4Fe(s) + 3O2(from air) + xH2O(moisture) → 2Fe2O3.xH2O(rust)
Corrosion of copper:
Cu(s) + H2O(moisture) + CO2(from air) → CuCO3.Cu(OH)2(green)
Corrosion of silver:
Ag(s) + H2S (from air) → Ag2S(black) + H2(g)
To know more about Corrosion, visit here.
Rancidity
It refers to the oxidation of fats and oils in food that is kept for a long time. It gives foul smell and bad taste to food. Rancid food causes stomach infection on consumption.
Prevention:
(i) Use of air-tight containers
(ii) Packaging with nitrogen
(iii) Refrigeration
(iv) Addition of antioxidants or preservatives
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Answer:
Yes the answer is really correct.