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 ________________ 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 ____________.

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 _____________ 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 _________.