The Seven Periods
1. First period The first period has two elements - hydrogen and helium. 2. Second and third period The second and third periods are known as short periods. Each consists of eight elements. The second period starts with lithium (Z = 3) and ends with inert gas neon (Z = 10)...
..The Seven Crystal System
2 SO 4 .10H 2 O Hexagonal a = b ≠ c α = β = 90°, γ = 120° Graphite, ZnO, CdS Rhombohedral a = b = c α = β = γ ≠ 90° Calcite, quartz, NaNO 3 Triclinic a ≠ b ≠ c α ≠ β ≠ γ ≠ 90° ..
Step 7
Reaction takes place in acidic medium, so add H+ ions to the side deficient in H+ and balance H and O atoms..
Reaction takes place in acidic medium, so add H+ ions to the side deficient in H+ and balance H and O atoms..7. Catenation
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..
Example: 7
How many grams of pure sulphuric acid is present in 0.05 mole of it? (H=1, S=32, O=1..
Table 6.7
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..
7) Action on heated carbon
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). ..
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). ..Molecule of Ammonia (H = 1, N = 7)
Three hydrogen atoms mutually share one pair of electrons each with a nitrogen atom to form a molecule of ammonia (Fig. 3.10). Note ..
Three hydrogen atoms mutually share one pair of electrons each with a nitrogen atom to form a molecule of ammonia (Fig. 3.10). Note ..Fig: 7.4 - Reaction between hydrogen and iodine
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..
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..See what our Users say :
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