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प्रश्न
What do you understand by exothermic reactions?
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उत्तर
An exothermic reaction is a chemical reaction that produces heat along with products.
\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]
APPEARS IN
संबंधित प्रश्न
Correct and balance the following equation:
\[\ce{Ca + H2O -> CaOH + H}\]
Write a complete balanced equation for the following reaction:
\[\ce{Sulphur dioxide (gas) + Oxygen (gas) -> Sulphur trioxide (gas)}\]
Balance the following equation:
\[\ce{H2O2 -> H2O + O2}\]
Give one example of an exothermic reaction.
One of the following does not happen during a chemical reaction. This is:
Write symbolic representation for the following word equation and balance them :
Iron + Sulphur → Iron sulphide.
Balance the following equation. Also name the product formed.
PbCO3 → PbO +CO2
Write the chemical equation for the following word equation and balance them.
Sodium reacts with water to form sodium hydroxide and hydrogen
Balance the following equation:
Fe + H2O → Fe3O4 + H2
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
Write the balanced chemical equation for this reaction.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – zinc carbonate.
In certain reaction a change of state is observed i.e. solid to liquid, liquid to gas etc. – State the change of state of the products – to give the respective reactant.
2H2 + O2 → 2H2O
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Light energy
Balance the following simple equation:
Al + N2 → AlN
Balance the following simple equation:
SO2 + O2 ⇌ SO3
Balance the following simple equation:
H2 + O2 → H2O
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Cl2 + 2H2O + SO2 → 4HCl + H2SO4
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
PbO2 +4HCl → PbCl2 + H2O + Cl2
What is a product in a chemical equation?
