Chemistry Questions

___ is the number of shells for elements of the 3rd period.

Fill in the blank with the most appropriate option.

Ethanol is denatured to ___.

Apart from proposing atomic theory, what did John Dalton researched on?

Electron configuration of cobalt 2+?

Isotopes have ______.

I. similar physical quantities and different chemical properties

II. different physical properties

III. similar chemical properties

Washing soda is used ______.

I. for removing permanent hardness of water

II. for disinfecting drinking water

III. as a cleaning agent for domestic purpose

____ are atoms/molecules/ions containing the same number of electrons.

Which statement(s) is/are CORRECT regarding Dalton’s Atomic theory?

I. All matters are made of very tiny particles.

II. Atoms of different elements have different masses and chemical properties.

III. The relative number of atoms is variable in any compound.