3-Elements, Compounds and Mixtures

What is the chemical symbol of iron?

• I

• Fe

• In

• Na

Which of the following is a homogeneous mixture?

• brass

• muddy water

• milk

• chalk powder in water

Which process can be used to obtain common salt from sea water?

• evaporation

• sublimation

• sedimentation

• filtration

Which of the following is used to obtain pure copper sulphate in the form of crystals from its saturated solution?

• evaporation

• fractional distillation

• distillation

• crystallization

Which of the following processes works on the basis of the difference in the boiling points of liquids?

• sedimentation

• filtration

• decantation

• fractional distillation

Which of the following is used to separate complex mixtures like coloured dyes from ink?

• evaporation

• chromatography

• separating funnel

• distillation

1. Fill in the blanks using words from the following list:

   formula, chemical symbol, sodium, potassium, miscible, mixture, compound, immiscible, residue, atomicity, filtrate, whole number, fractional, boiling

3. The (a)   of an element is the abbreviation of its full name.

1. Fill in the blanks using words from the following list:

   formula, chemical symbol, sodium, potassium, miscible, mixture, compound, immiscible, residue, atomicity, filtrate, whole number, fractional, boiling

3. Natrium is the Latin name of (a)   .

1. Fill in the blanks using words from the following list:

   formula, chemical symbol, sodium, potassium, miscible, mixture, compound, immiscible, residue, atomicity, filtrate, whole number, fractional, boiling

3. A (a)   is always made up of the same elements combined in a fixed ratio.

1. Fill in the blanks using words from the following list:

   formula, chemical symbol, sodium, potassium, miscible, mixture, compound, immiscible, residue, atomicity, filtrate, whole number, fractional, boiling

3. The number of atoms present in a molecule of an element is called its (a)   .