chemistry for grade 7\

Reaction takes place in acidic medium, so add H+ ions to the side deficient in H+ and balance H and O atoms..

How many grams of pure sulphuric acid is present in 0.05 mole of it? (H=1, S=32, O=1..

Catenation is the tendency of an atom to form bonds with identical atoms. In this group only sulphur has a strong tendency for catenation. Oxygen also shows this tendency to a limited extent. Thus the polyoxides and polysulphides of the following types are known: H 2 O 2 , H - O - O - H Polyoxides..

When carbon dioxide is passed over red-hot carbon in the form of coke charcoal, etc., the carbon dioxide loses one of its two atoms of oxygen. As a result, carbon dioxide gets reduced and becomes carbon monoxide. At the same time the hot carbon also gets converted to carbon monoxide (Fig.11.12). ..

Solute/Solubility 0 o C 20 o C 60 o C 100 o C Calcium hydroxide 1.19 0.17 0.12 0.08 Calcium sulphate 0.18 0.19 0.20 0.16 Cerium sulphate 17.35 9.16 3.73 - If the solute and solvent are both soluble liquids, like alcohol and water, there is no limit to solubility i..

Three hydrogen atoms mutually share one pair of electrons each with a nitrogen atom to form a molecule of ammonia (Fig. 3.10). Note ..

Thus, chemical equilibrium may be defined as the state in which the measurable properties of the system (such as pressure, density, colour or concentration) do not undergo any further noticeable change under given set of conditions is said to be a state of equilibrium. When a reaction is carried i..

This represents an equilibrium state and can be represented as:..

It is prepared from chromite ore (FeCr 2 O 4 ). This preparation involves many ste..