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प्रश्न
Give one example of a chemical reaction.
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उत्तर
Burning of magnesium ribbon in air to give white powder of magnesium oxide is an example of chemical reaction.
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संबंधित प्रश्न
Write the balanced chemical equation for the following reaction.
\[\ce{Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water}\]
Rewrite the following information in the form of a balanced chemical equation:
Magnesium burns in carbon dioxide to form magnesium oxide and carbon.
What do you understand by exothermic reactions?
Explain the following reaction with one suitable example .
Decomposition reaction
Write word equation for the following skeletal equation:
\[\ce{CO + O2 -> CO2}\]
Write word equation for the following skeletal equation:
\[\ce{KNO3 -> KNO2 + O2}\]
Write symbolic representation for the following word equation and balance them :
Iron + Sulphur → Iron sulphide.
What is a chemical equation? Why it is necessary to balance it?
What is the limitation of the reaction given in question 2?
Balance the following equation:
Ca + N2 → Ca3N2
Balance the following equation:
S + H2SO4 → SO2 + H2O
Balance the following equation:
Pb3O4 + HCl → PbCl2 + H2O + Cl2
What information does the following chemical equation convey?
Zn + H2SO4 → ZnSO4+ 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.
Write word equation for the following molecular equation:
\[\ce{CuSO4 + 2NaOH -> Na2SO4 + Cu(OH)2↓}\]
Word equation:
State the colour of the products.
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 – lead [IV] oxide.
Representation of the results of a chemical change – is a chemical equation.
For the equation: FeCl3 + 3NH4OH 3NH4Cl + Fe(OH)3 ↓
Answer the following:
Is the equation given above a balanced equation. Give reasons.
Balance the following simple equation:
Fe + H2O ⇌ Fe3O4 + H2
What are reactants? Explain with the help of example.
Write three steps of writing chemical equations with example?
