Advertisements
Advertisements
Question
How is cream separated from milk ?
Advertisements
Solution
Cream is separated from milk by the process of centrifugation. It is the process of separating the suspended particles from a liquid. The mixture is rotated at high speed in a centrifuge.
When milk is centrifuged, the cream and skimmed milk are separated. Cream, being lighter, starts floating on the skimmed milk and hence, can be separated.
APPEARS IN
RELATED QUESTIONS
Name two processes which provide the best evidence for the motion of particles in matter.
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
What is meant by saying that non-metals are brittle ?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Give reason why copper metal is used for making electric wires.
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Choose the correct answer.
A 15% alcohol solution means :
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
State whether the following statement is true or false :
Sponge is an example of solid sol.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Which of the following represents the solubility of sugar in water at 20°C ?
Name the process by which the various gases of the air are separated.
What difference in the properties of oil and water enable their separation by a separating funnel ?
Name the process which can be used to purify an impure sample of copper sulphate.
Diffentiate between absorption and adsorption.
Liquids cannot be compressed and they have fixed volume.
Give an example of a molecule.
