Advertisements
Advertisements
Question
What are the characteristic properties of a pure substance? Why do we need them?
Advertisements
Solution
Pure substance : Pure substances have a definite set of properties such as boiling point, melting point, density, etc. They are all homogeneous i.e., their composition is uniform throughout the bulk. Both elements and compounds are pure substances.
Pure substances are needed to :
- Manufacture medicines.
- To prepare chemicals in industry.
- For scientific purposes.
- To maintain the good health of human beings.
APPEARS IN
RELATED QUESTIONS
Which of the following is not a mixture ?
Name the solvent you would use to separate a mixture of sulphur and carbon.
Name one pair of substances whose mixture can be separated by fractional distillation.
Seawater tastes salty due to the dissolved salt. the salinity (the proportion of salts in water) of some water bodies Lonar lake - 7.9 %, Pacific Ocean 3.5%, Mediterranean sea - 3.8%, Dead sea - 33.7%. Explain two characteristics of the mixture from the above information.
Give two examples of the following type of mixture.
liquid-gas
Name two substances soluble in water.
State whether the following statement is true or false. If false write – the correct statement.
Sodium chloride and water is an example of a mixture of elements and compounds.
Name the following:
A mixture of two immiscible liquids
Give a reason for the following statement:
Gunpowder is an example of a heterogenous mixture.
Suggest separation technique(s) one would need to employ to separate the following mixture.
Mercury and water
