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How Will You Indicate Exothermic Reaction in a Chemical Equation? - Science

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प्रश्न

How will you indicate Exothermic reaction in a chemical equation?

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उत्तर

Exothermic reaction is indicated by writing “heat” or “heat energy” or “energy” on the products’ side of a chemical reaction.
Example:  CH4 + 2O2 → CO2 + 2H2O + Heat

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पाठ 1: Chemical Reactions and Equations - Exercise 1 [पृष्ठ १८]

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लखमीर सिंह Chemistry (Science) [English] Class 10
पाठ 1 Chemical Reactions and Equations
Exercise 1 | Q 9.2 | पृष्ठ १८

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संबंधित प्रश्‍न

Translate the following statement into chemical equation and then balance it.

 Hydrogen gas combines with nitrogen to form ammonia


Fill in the following blank with suitable word:

 Chemical equations are balanced to satisfy the law of ............


 Potassium chlorate (KClO3) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas.


What do you understand by exothermic reactions?


You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of:
(a) potassium chloride
(b) potassium nitride
(c) potassium sulphide
(d) potassium iodide


Balance the following chemical equation :

Na20 + H20  →  NaOH


Write your observation for the following chemical reaction and name the product formed :
When ammonium chloride is heated with sodium hydroxide.


Write symbolic representation for the following word equation and balance them :

Iron + Sulphur → Iron sulphide.


Write your observation and name the product when An aqueous solution of barium chloride is added to dilute sulphuric acid.


Write the chemical equation for the following word equation and balance them.

Sodium reacts with water to form sodium hydroxide and hydrogen


Write the balanced chemical equation of the following reaction.

aluminium carbide + water → aluminium hydroxide + methane


(a) Give only one suitable chemical test to identify the following gases.

  1. Ammonia
  2. Sulphur dioxide
  3. Hydrogen Chloride
  4. Chlorine
  5. Carbon Dioxide
  6. Oxygen
  7. Hydrogen

(b) Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?

(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?

(d) State the gas responsible for bleaching action.

(e)Which gas turn blue cobalt chloride paper light pink?

 


What is thermit process? Where is this process used? Write a balanced chemical equation for the reaction involved.


Write word equation for the following molecular equation:

FeSO4 + 2NaOH →Na2SO4 + Fe(OH)2 ↓

Word equation:

State why [↓] indication is seen after Fe(OH)2 and not after Na2SO4


Write word equation for the following molecular equation:

CaO + H20 → Ca (OH)2 + Δ

Word equation:

State why [+ Δ ] is not written in the reaction, if ZnO reacts with H2O.


Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.

Pressure


Balance the following simple equation:

NaOH  +  Cl2  →  NaCl  +   NaClO  +  H2


CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]

State the information provided by the above chemical equation.


Write a balanced equation for the following word equation:

Calcium hydroxide + Ammonium chloride → Calcium chloride + Water + Ammonia


Balance the following chemical equation.

  1. Na + O2 → Na2O3
  2. Ca + N2 → Ca3N2
  3. N2 + H2 →NH3
  4. CaCO3 +HCl → CaCl2 + CO2 +H2O
  5. Pb(NO3)2 → PbO + NO2 + O2

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