Advertisements
Advertisements
प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Advertisements
उत्तर
A catalyst is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Fill in the blank.
Melting of ice is a _______ change.
Fill in the blank
A new substance is formed in a _______ change.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Write true or false :
No new substance is formed during a chemical reaction.
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
What do you understand by 'chemical reaction'?
What do you observe when Cobalt chloride paper is introduced in water vapour.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Explain the following statement: Digestion is a chemical change.
________ is a chemical substance which alters the speed of a chemical reaction.
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
How would you show that the settling of curd is a chemical change?
When carbon dioxide is passed through lime water ______.
