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प्रश्न
Explain the term with examples.
Endothermic reaction
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उत्तर
Endothermic reaction:
An endothermic reaction is any chemical reaction that absorbs heat from its environment. The absorbed energy provides the activation energy for the reaction to occur. A hallmark of this type of reaction is that it feels cold.
A good example of an endothermic reaction involves dissolving a salt. The salt doesn't have to be table salt, and the solvent doesn't need to be water.
- The reaction of barium hydroxide octahydrate crystals with dry ammonium chloride
- Dissolving ammonium chloride in water
- The reaction of thionyl chloride (SOCl2) with cobalt(II) sulphate heptahydrate
- Mixing water and ammonium nitrate
- Mixing water with potassium chloride
- Reacting ethanoic acid with sodium carbonate
- Photosynthesis (chlorophyll is used to react carbon dioxide plus water plus energy to make glucose and oxygen)
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संबंधित प्रश्न
Define endothermic reactions. Give two examples of each.
State the effect of an endothermic reaction.
FILL IN THE BLANK
In a................ reaction heat energy is absorbed.
Give scientific reason.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Identify the endothermic and exothermic reaction.
HCl + NaOH → NaCl + H2O + heat
Identify the endothermic and exothermic reaction.
\[\ce{2KClO_{3(s)}->[\Delta] 2KCl_{(s)} + 3O2}\]
Give scientific reasons.
While preparing dil. Sulphuric acid from concentrated conc. sulphuric acid in the laboratory the concentrated sulphuric acid is, add slowly to water with constant stirring.
Complete the following statement.
On heating, hydrated copper sulphate changes its colour from ________ to __________.
Why energy is involved in a chemical change?
Name a nitrate which produces oxygen as the only gas.
Give an example of the following chemical changes.
An exothermic and an endothermic reaction involving carbon as one of the reactants.
Differentiate between the following:
A catalyst and a promoter.
Give an example with a balanced equation, of the following reaction:
exothermic reaction
Give an example with a balanced equation, of the following reaction:
electrochemical reaction
Supply of energy may be required to initiate a reaction. State the different forms with a suitable example of reactions initiated by the supply of energy.
Select the correct answer from the options given below:
State the gaseous product formed, when
An exothermic reaction takes place between ammonia and neutral gas.
True or False. If false, give the correct answer.
Tarnishing of silver is an example of endothermic change.
Mention any two exothermic reactions.
The Dissolution of glucose in water is also an ______ change.
