Class 9 Is Matter Around Us Pure Important QuestionsImportant Questions Notes
Is Matter Around Us Pure Important Questions
- State the differences between compounds and mixtures.
- What are alloys? What are the constituents of brass?
- Differentiate between colloid, solution and suspension.
- a. What is Tyndall effect? Does true solution exhibit Tyndall effect?
b. “Tyndall effect can be seen when sunlight passes through the canopy of forest.” Explain how this occurs?
- To make a saturated solution, 36 g sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
- How crystallization is better than evaporation?
- Name the technique used to separate
a. butter from curd
b. salt from sea water
c. camphor from salt.
- Name the following:
a. A lustrous liquid metal
b. A liquid non metal
c. A metal which can be cut with a knife
d. A non metal which is a good conductor of electricity
e. An element which melts when kept on the palm
f. The best conductor of heat
- Identify solute & solvent in the following solutions:
a. Aerated drinks
b. Tincture of iodine
- State the principals of each of the following methods of separation of mixtures:
a. Centrifugation method
b. Separation using separating funnel
- What is pure substance? What are the characteristics exhibited by pure substance?
- What is emulsion? Give one example.
- What is crystallization? Give its two applications.
- How would you confirm that a colourless liquid given to you is pure water?
- 15 g of salt is dissolved in 100 g water at 293 K. Find its concentration at this temperature.
- a. Name the process used to separate a mixture of acetone and water.
b. Give the principal of this process.
c. Draw a labeled diagram of the process used to show the separation of above mixture.