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प्रश्न
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
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उत्तर
Glucose and Oxygen.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
FILL IN THE BLANK
In a ............ change, new substances are formed.
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
Explain the following reaction with one suitable example of Combination reactions .
When electric current is passed through acidulated water ______ of water takes place.
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 observe? When
Barium chloride is added to sodium sulphate solution
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
The water we drink is a combination of hydrogen and oxygen.
The chemical name of baking soda is sodium bicarbonate.
Write the characteristics of chemical change.
______ is the chemical name of rust.
