8 grade chemistry


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Example: 8
Calculate the gram atoms present in 8g of oxyge..
Step 8
relation between molecular mass and emprical formula mass The value of n is obtained through the relation,..
8. Manufacture of aerated drinks
Carbon dioxide is extensively used in aerated drinks. Increasing the pressure increases the solubility of the gas. The fizz in the drink is due to carbon dioxide being liberated when the pressure is reduce..
Molecule of Oxygen (O = 8)
oxygen molecule formation An example of sharing of two pairs of electrons (Double bond). Two atoms of oxygen share two pairs of electrons to form one molecule of oxygen (Fig. 3.5). Note :..
Molecule of Water (H = 1, O = 8)
water molecules formation Two hydrogen atoms mutually share one electron each with an atom of oxygen to form a water molecule (Fig. 3.8). Note ..
Table 8.1 - Examples of Dobereiner's Triads
Element Lithium Beryllium Boron Arithmetic mean Atomic mass 7.0 9.0 11.0 9.0 Element Lithium Sodium Potassium Arithmetic Mean Atomic mass 7.0 230 39.0 23.0 Element Carbon Nitrogen Oxygen Arithmetic mean Atomic mass 12.0 14.0 16...
Molecule of Carbon Dioxide (C = 6, O = 8)
carbon dioxide formation The two atoms of oxygen mutually share two pairs of electrons each with an atom of carbon to form a molecule of carbon dioxide (Fig. 3.13). Note : In the above diagram only the valence or outermost shell of carbon and oxygen atoms are shown..
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 electron..
Environmental Chemistry
Learn through Animation Environmental Chemistry..
Environmental Chemistry
Learn through Animation Environmental Chemistry..
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