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प्रश्न
Define chemical reaction.
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उत्तर
Any chemical change in matter that involves its transformation into one or more new substances is called a chemical reaction.
संबंधित प्रश्न
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
FILL IN THE BLANK
Negatively charged ions are called ..........
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
Write a short note on the information derived from a balanced chemical equation.
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
What do you observe? When
Water is added to the quick lime.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
What is a chemical reaction?
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
What is the use of indicator?
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
Is the conversion of milk into ice cream a chemical change?
Write the chemical reaction of baking soda with lemon.
Write a note on the following:
Curdling of milk
______ is the chemical name of rust.
What is the difference between reactants and products?
