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प्रश्न
Fill in the blank
A new substance is formed in a _______ change.
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उत्तर
A new substance is formed in a chemical change.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
How do the following help in bringing about a chemical change?
heat.
A chemical equation is a statement that describes a chemical change in terms of
Give an example of a reaction where the following are involved:
Close contact
Give an example of a reaction where the following are involved
Catalyst
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Circle the odd one out. Give reason for your choice
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
Write a note on the following:
Fermentation
______ is the chemical name of rust.
