chemistry for grade 7\\

Aluminium is the third most abundant element (8.3% by weight) in the earth's crust after oxygen (45.5%) and silicon (25.7%..

The possible isomers of the aromatic compound having molecular formula C 7 H 7 Cl are benzyl chloride and ortho chlorotoluene and para chlorotoluene...

7 molecule The outer electronic configuration of iodine atom is 5s 2 5p 5 . To make seven bonds, one s and two p orbitals are promoted to the higher vacant 5d orbitals as shown in fig.1.29 (b). fig 1.29 (b) - Pentagonal bipyramidal geometry of IF 7 molecule These se..

Potassium dichromate = K 2 Cr 2 O 7 GMM = (2 x 39) + (2 x 52) + (7 x 16) = 78 + 104 + 112 g = 294 ..

A true solution is a homogeneous solution in which the solute particles have diameters less than 10 - 7 cm. i.e., the solute particles are of molecular dimensions. The particles are invisible even under powerful microscope..

7. 1.375 g of cupric oxide on reduction in hydrogen gas gives 1.098 g of copper. In another experiment, 1.179 g of metallic copper produced 1.476 g of copper oxide. Show that these results illustrate the law of constant proportio..

The process of reduction of a metal oxide to the metal with the help of aluminium powder, which liberates large amount of heat to produce the metal in its molten state, is called Goldschmidt thermite process. 7. How is gold recover..

4 .7H 2 O) Magnesium sulphate heptahydrate is commonly known as epsom salt because it was formerly prepared from water of the Epsom springs in Englan..

Assuming aluminium (At mass = 27) has a density of 2.7 g cm - 3 and its unit cell has an edge of 400 pm, what is the nature of the crystal lattice for the meta..

Problems - 7. 1.375 g of cupric oxide on reduction in hydrogen gas gives 1.098 g of copper. In another experiment, 1.179 g of metallic copper produced 1.476 g of copper oxide. Show that these results illustrate the law of constant proportio..