Advertisements
Advertisements
Question
Describe a method to separate a mixture of camphor and sand.
Solution
Sublimation method is used to separate a mixture of camphor and sand. Camphor is a volatile solid and can be separated from any other non-volatile substance by heating. Sand is a non-volatile substance. When a mixture of sand and camphor is heated, sand will remain in the container but camphor will vaporise. These vapours are collected and condensed on a cold surface.
APPEARS IN
RELATED QUESTIONS
All kinds of matter
Explain why air is used to inflate tyres.
Define matter. Give four examples of matter.
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Give reason why copper metal is used for making electric wires.
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
The element which is not common between the compounds called baking soda and soda ash is
Which one of the following is not a metalloid ?
The elements which normally exist in the liquid state are :
What is the difference between solutions and colloids ?
Explain what happens when a beam of light is passed through a colloidal solution.
Which of the following is not an emulsion ?
Write a method to separate a mixture of sand and potash alum.
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.