chemistry for grade 7

The measurable/visible properties of the system must remain unchanged with time. Once, an equilibrium is reached the properties of the system do not change with time. When equilibrium is attained, there exists an expression of concentrations of the substances involved in equilibrium, which bec..

K 2 Cr 2 O 7 (Potassium dichromate) - It is prepared from chromite ore (FeCr 2 O 4 ). This preparation involves many ste..

Acidified potassium permanganate (or potassium dichromate) oxidises the dihydroxy compound so produced in reaction to ketone and/or carboxylic acid. For example, ..

The atoms of group 17 have seven electrons in the outermost shell, and have the general electronic configuration ns 2 np ..

The units of all physical quantities can be derived from the seven basic units. These units are called derived units because they can be derived from the basic units algebraically by multiplication and division. It is frequently necessary to convert one set of units to anoth..

Atomic Properties - Electronic Configurations - The atoms of group 17 have seven electrons in the outermost shell, and have the general electronic configuration ns 2 np ..

General Characteristics of Periods - 1. Valence shell electrons The valence shell electrons increase form one to seven as we move from left to right in a period. 2. Valency The valency of the elements with respect to hydrogen, increases form 1 to 4 and then falls from 4 to 1 across the pe..

The units of all physical quantities can be derived from the seven basic units. These units are called derived units because they can be derived from the basic units algebraically by multiplication and division. It is frequently necessary to convert one set of units to anothe..

This involves the mixing of one s three p and three d-orbitals forming seven sp 3 d 3 hybrid orbitals having pentagonal bipyramidal geometry. The geometry of IF 7 molecule can be explained on the basis of sp 3 d 3 Hybridizatio..

sp 3 d 3 Hybridization - This involves the mixing of one s three p and three d-orbitals forming seven sp 3 d 3 hybrid orbitals having pentagonal bipyramidal geometry. The geometry of IF 7 molecule can be explained on the basis of sp 3 d 3 Hybridizati..