Atoms and Molecules — Science STD 9 — Question

An element has atomic number 13 and an atomic mass of 27.
How many electrons are there in each atom of the element?

Name a non-metal:
Which is known to form the largest number of compounds.

Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).

State one instance where water undergoes a physical change and one in which it undergoes a chemical change.

Determine the molecular mass of ZnSO₄ [atomic mass of Zn = 65u, S = 32u, 0 = 16u]

Calculate the mass of the following:
5 moles of aluminium borate.

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.

What is the mass of one mole of oxygen atoms?

Name the physical state of matter which can be easily compressed.

Name the physical state of matter which can be easily compressed.