The Language of Chemistry — CHEMISTRY STD 9 — Question

Identify the following substance:
A brown gas D with the irritating smell.

Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkali metal in period 3 dissolves in the water giving a strong alkali.

Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons

Fill in the blank:
Symbolic expression for a molecule is called _____.

Name the three fundamental particles of an atom.

Correct the following statement:
A molecule of sulphur is monoatomic.

Write the chemical reaction where the following changes are observed.
Precipitate is formed

The elements calcium, strontium and barium were put in one group or family on the basis of their similar properties.
What were those similar properties?

Give the balanced equation of the reaction.

Give an example of a reaction where the following are involved
Pressure