Download App

Is Matter Around Us Pure? — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?4 Marks
Question
State the main points of difference between homogeneous and heterogeneous mixtures.
✓

Answer

Those mixtures in which the substances are completely mixed together and are indistinguishable from one another, are called homogeneous mixtures. They have a uniform composition throughout its mass. All the homogeneous mixtures are called solutions.
Examples: Sugar solution, salt solution, copper sulphate solution, etc.
Those mixtures in which the substances remain separate and one substance is spread throughout the other substance as small particles, droplets or bubbles, are called heterogeneous mixtures. Heterogeneous mixture does not have a uniform composition throughout its mass.
Example: Starch solution, soap solution.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 4 Mark )" from Is Matter Around Us Pure?→Is Matter Around Us Pure? — all question types→Science STD 9 question papers→Rajasthan Board STD 9 question papers→Rajasthan Board question paper generator→

Similar questions

An object is dropped from rest at a height of $150m$ and simultaneously another object is dropped from rest at a height $100m.$ What is the difference in their heights after $2s$ if both the objects drop with same accelerations? How does the difference in heights vary with time?
→
Write an activity to show that water can be made to boil even at a temperate below its normal boiling point $(100^\circ C)$.
→
What should be do to get maximum benefit from a crop field?
→
Differentiate between sclerenchyma and parenchyma tissue. Draw well labelled diagram.
→
What are ionic and molecular compounds? Give examples.
→
Which separation techniques will you apply for the separation of the following?
  1. Sodium chloride from its solution in water.
  2. Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
  3. Small pieces of metal in the engine oil of a car.
  4. Different pigments from an extract of flower petals.
  5. Butter from curd.
  6. Oil from water.
  7. Tea leaves from tea.
  8. Iron pins from sand.
  9. Wheat grains from husk.
  10. Fine mud particles suspended in water.
→
State and explain Newton’s second law of motion.
→
Discuss the method of separating a mixture containing chalk powder, iron fillings and naphthalene.
→
$A, B$ and $C$ are all liquids. Liquid $A$ has a comparatively low boiling point. On heating, liquid a vaporizes completely without leaving behind any residue. Liquid $A$ is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid $B$ has a very high boiling point. It also vaporizes completely on heating, without leaving any residue. Liquid $B$ is a conductor of electricity and used in making thermometers. Liquid $c$ has a moderate boiling point. On heating, liquid $C$ vaporises leaving behind a white solid $D$ which is used in cooking vegetables. The condensation of vapours from $C$ give a liquid $E$ which turns anhydrous $CuSO_4$ to blue.
  1. Which liquid could be an element? Name this element.
  2. Which liquid could be a mixture? Name this mixture.
  3. Which liquid could be a compound? Name this compound.
  4. What could the solid $D$ be?
  5. What do you think is liquid $E$?
→
Explain composite fish culture system with examples. State the major problem associated with this system. Can fish culture be done in any type of combination? If yes, explain.
→