Advertisements
Advertisements
Question
Match the pairs.
a. | Photosynthesis | i. | Tendency to lose electrons |
b. | Water | ii. | Reactant in combustion process |
c. | Sodium chloride | iii. | Chemical change |
d. | Dissolution of salt in water | iv. | Covalent bond |
e. | Carbon | v. | Ionic bond |
f. | Fluorine | vi. | Physical change |
g. | Magnesium | vii. | Tendency to form anion |
Solution
a. | Photosynthesis | iii. | Chemical change |
b. | Water | ii. | Reactant in combustion process |
c. | Sodium chloride | v. | Ionic bond |
d. | Dissolution of salt in water | vi. | Physical change |
e. | Carbon | iv. | Covalent bond |
f. | Fluorine | vii. | Tendency to form anion |
g. | Magnesium | i. | Tendency to lose electrons |
RELATED QUESTIONS
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give an example of the following chemical changes.
A reaction where colour change is noticed.
What is observed in performing the following :
Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
Litmus test | ||||
Apply a burning splint to the gas | ||||
Colour of gas | colourless | colourless | colourless | greenish-yellow |
Odour of gas |
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
What is a chemical reaction?
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.
Give a suitable example with an equation to show the representation of a chemical reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
What kind of a change is associated with decaying of a plants?