Advertisements
Advertisements
प्रश्न
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Advertisements
उत्तर
Glucose and Oxygen.
APPEARS IN
संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
Define electrolysis.
What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
True or false
New substances are formed in a chemical change.
Explain the following reaction with one suitable example of Displacement reaction.
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Give an example of the following chemical change.
A reaction where colour change is noticed
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
The chemical change is ______.
______ is not a chemical change.
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.
What is the role of a catalyst in a chemical reaction?
A reaction between an acid and a base is called ______.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
What is thermochemical reactions?
Define the following term:
Chemical change
