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प्रश्न
A chemical equation is a statement that describes a chemical change in terms of
पर्याय
symbols and formulae
energy
number of atoms
colours
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उत्तर
symbols and formulae.
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron and rust are the same substances.
What are oxides ?
FILL IN THE BLANK
In a ............ change, new substances are formed.
TRUE \ FALSE
Ammonia is a good oxidizing agent.
What are biocatalysts ?
What do you observe when :
an iron nail is kept in tap water for few days
State what you would observe when the following substance is heated in a glass test tube red lead.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Give an example of a reaction where the following are involved
Light
Write the chemical reaction where the following changes are observed.
Physical state is changed
Give an example of a photochemical reaction.
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
What do you observe when Cobalt chloride paper is introduced in water vapour.
Give a chemical test to distinguish between the following gases.
HCl and H2S
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
______ is a chemical substance is used in whitewashing.
