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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.
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
Define precipitation reaction.
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
Explain the following reaction with one suitable example of Double decomposition reaction.
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
What do you understand by precipitation reaction? Explain with examples.
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 CO2
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
Give a suitable example with an equation to show the representation of a chemical reaction.
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
The percentage composition of Nitrogen in Ureas is ______.
Water boiling into water vapour is an example of chemical change.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Beating an egg to make a cake is a ______.
Write the chemical reaction of baking soda with lemon.
Write the characteristics of chemical change.
Photosynthesis is a chemical charge. Justify your answer.
When carbon dioxide is passed through lime water ______.
