Question

give an example of each of reaction where the following are involved ​

Answer 1

$\underline{\underline{\pink{\huge\sf Answer}}}$

☯ $\underline{\green{\textsf{Evolution of Heat}}}$

When a reaction release energy in the form of heat or light is called as an Exothermic Reaction. Which means that in such a type of reaction energy is released into the surroundings. This reaction can be shown as Reactant ➝ Product + Heat

Eg - Fire also called as combustion us an example of an Exothermic Reaction( For methane :- $\sf CH_4+O_2 \to CO_2 + H_2O+Heat$

☯ $\underline{\red{\textsf{Absorbtion of Heat}}}$

When heat is absorbed during a reaction is called as an Endothermic Reaction. This is an opposite of Exothermic Reaction. Physical process can be endothermic as well,like the melting of ice cube. This reaction can be represented as Reactant ➝ Product - Heat

Eg - $\sf NH_4Cl + H_2O\to NH_4Cl-Heat$

☯ $\underline{\orange{\textsf{High Pressure}}}$

Here we increase the pressure. This has an impact in the rate in which the reaction happens.

Eg - $\sf N_2 + 3H_2 = 2NH_3 \:\: [Above \ 200 \ atm]$

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Answer 2

Answer:

i) carbon + oxygen _____ carbon dioxide

c+o2 _______ co2 ( Evolution of heat )

ii) These examples could be written as chemical reactions, but are more generally considered to be endothermic or heat - absorbing processes: melting ice cubes. melting solid salts. Evaporating liquid water.

iii) one example is the combination of iron and sulfur to form iron (ll) sulfide: Another example is simple hydrogen gas combined with simple oxygen gas to produce a more complex substance, such as water.

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