chemistry for grade 7

Alkali 1 part Water 7 parts Starch 1 pa..

Alkali 1 part Water 7 parts Starch 1 pa..

a) Group IA, IIA and IIIA consists of metals of normal elements. They have 1, 2, or 3 valence electrons which they can easily donate to acquire the configuration of nearest noble gas. They become positively charged i.e., cation..

Take about 7g of freshly powdered iron, and a little more than 4 g of sulphur. Mix them well. However well it may be mixed, the iron and sulphur particles can be seen separately. Also the above said properties of both iron and sulphur will still be exhibited by this mixtu..

A hydrocarbon was found to contain the following percentage composition. C = 92.3%, H = 7.69%. Calculate its empirical formula (C=12, H=1..

7. Identify the atoms which do not obey the octet rule in the following compounds and draw their Lewis structures? SO 2 or SF ..

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...

1 mole of N 2 = 1 GMM 1 mole of N 2 = 2 x 14g = 28g 1 mole = 28 g ? = 7 g 7g of nitrogen is equal to 0.25 mol..

A colloid is a solution in which the particle size ranges between 10 - 7 and 10 - 5 cm. For example, milk, blood, honey, smoke, ink, gum, starch solution et..