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प्रश्न
True or false
New substances are formed in a chemical change.
विकल्प
True
False
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उत्तर
True
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron pipes coated with zinc do not get rusted easily.
How do the following help in bringing about a chemical change?
catalyst .
FILL IN THE BLANK
Negatively charged ions are called ..........
What do you observe when :
an iron nail is kept in tap water for few days
Explain the term reactant and product giving examples.
Give an example of a reaction where the following are involved
Heat
Write the chemical reaction where the following changes are observed.
Colour change is noticed
What do you observe? When
Barium chloride is added to sodium sulphate solution
Give a chemical test to distinguish between the following gases.
H2 and O2
What do you observe when CO2 is passed through lime water first and then a little in excess.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
The chemical change is ______.
Limestone contains ______ mainly.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
Write the equation for the process of formation of rust.
Chemical changes are important in our day-to-day life. Give examples.
Write a note on the following:
Curdling of milk
Define the following term:
Chemical change
