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प्रश्न
Explain the term with examples.
Endothermic reaction
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)
APPEARS IN
संबंधित प्रश्न
What do you observe when Ammonia is brought in contact of hydrogen chloride.gas.
State the effect of an exothermic reaction on the surroundings.
Give an example of the following chemical changes.
A reaction involving blue solution.
Complete the following statement.
On heating, hydrated copper sulphate changes its colour from ________ to __________.
Why energy is involved in a chemical change?
Name a carbonate which do not decompose on heating.
State the following reaction whether heat is evolved or absorbed –
water is added to quicklime
State the following reaction whether heat is evolved or absorbed –
Two neutral gases on passage through an electric are given nitric oxide.
Give a balanced equation for the following type of reaction:
A catalytic, reversible, exothermic reaction.
Differentiate between the following:
A catalyst and a promoter.
Chemical reactions may proceed with evolution of heat. Give an example.
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.
Mention any two exothermic reactions.
Complete the following table:
| Chemical Reactions | Name reaction type |
| \[\ce{C(s) + O2(g) -> CO2(g)}\] | (a) ________ |
| \[\ce{Zn(s) + CuSO4(aq) ->}\] (b) _________ | Displacement reaction |
| \[\ce{2Cu(s) + O2(g) ->[heat] 2CuO(s)}\] | (c) _________ |
| \[\ce{C(s) + 2H2(g) -> CH4(g)}\] | (d) _________ |
| \[\ce{CaO(s) + H2O(l) -> Ca(OH)2(aq) + heat}\] | (e) _________ |
| \[\ce{CaCO3(s) + Heat ->}\] (f) _________ | Endothermic Reaction |
Give a 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.
Give scientific reasons.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
Give scientific reasons.
While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.
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.
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.
