Advertisements
Advertisements
Question
State four conditions necessary for chemical reactions to take place.
Advertisements
Solution
Conditions necessary for chemical reactions :
- Close contact
- Solution form
- Heat
- Light
- Catalyst
APPEARS IN
RELATED QUESTIONS
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.
What do you observe when iron nail is kept in copper sulphate solution for sometime.
FILL IN THE BLANK
Negatively charged ions are called ..........
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
How is precipitate formation in a chemical reaction indicated?
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give a chemical test to distinguish between the following gases.
HCl and Cl2
What do you observe when CO2 is passed through lime water first and then a little in excess.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
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 active metal reacts with dilute sulphuric acid.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
The chemical change is ______.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
Is the conversion of milk into ice cream a chemical change?
How can we prevent rusting?
______ is a chemical substance is used in whitewashing.
