Advertisements
Advertisements
प्रश्न
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Advertisements
उत्तर
A change in which the substance can be brought back to its original state is called a reversible change.
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
Name three biochemical catalysts found in the human body.
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Fill in the blank
A new substance is always formed in a _______ change.
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Define the following term:
Precipitate
Give an example of a reaction where the following are involved
Light
Give an example of a reaction where the following are involved
Electricity
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
Give a suitable example with an equation to show the representation of a chemical reaction.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
A reaction between an acid and a base is called ______.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
Iron and rust are the same substances.
______ is the chemical name of rust.
What are the chemical reactions that occur in everyday life?
