chemistry for grade 7

Haloalkanes with three or more carbon atoms exhibit position isomerism in which the isomers differ in the position of halogen atom. For example, C 3 H 7 I has two position isomers:..

pH is the negative logarithm of H 3 O + ion concentration in moles/litre pH of water = 7 at 298 K pH of acids = less than 7 pH of bases = greater than 7..

Periodic Table and Valency of Elements - 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..

Representative elements are those elements whose inner shells are complete and whose outer shell (valency shell) has 1 to 7 electron..

It is fairly soluble in cold water. One volume of water at 20 o C dissolves 2.7 volumes of the ga..

7. About 0.98 g of the chloroplatinate of some diacidic base when ignited left 0.39 g of platinum as residue. What is the molecular mass of the base? (Atomic mass of Pt = 198..

Representative Periodic Table for 8 Groups upto Calcium (Atomic Number -20) - Representative elements are those elements whose inner shells are complete and whose outer shell (valency shell) has 1 to 7 electrons. They are also called normal elemen..

pH plays a very significant role in biochemical reactions. For example, the blood in our bodies is buffered at a pH value of 7.36-7.42 due to bicarbonate - carbonic acid buffer. A mere change of 0.2 pH units can cause death. Certain enzymes get activated only at certain definite pH value..

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..