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प्रश्न
________ is a chemical substance which alters the speed of a chemical reaction.
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उत्तर
Catalyst is a chemical substance which alters the speed of a chemical reaction.
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संबंधित प्रश्न
State four conditions necessary for chemical reactions to take place.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Explain,giving one example of the following chemical changes:
Reversible reaction
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
______ is a natural indicator.
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
