chemistry grade 4

Molecule having four bond pairs of electrons around the central atom, arrange their electrons tetrahedrally. These molecules have tetrahedral shapes and the four bond pairs are at an angle of 10928' with respect to each other. Some molecules which show tetrahedral geometry are ..

Methane burns in oxygen to form water vapour and carbon dioxide according to the equation: 200 ml of methane is mixed with 500 ml of oxygen and ignited. Calculate the total gaseous volume after the combusti..

The increase and decrease in oxidation number per atom can be indicated as: O.N. increases by 2 per ato..

This solution removes the vapours of hydrogen chloride from the carbon dioxide gas. The gas is now passed through concentrated sulphuric acid to remove water vapour. It is then collected over mercury. Remember : Dilute sulphuric acid should not be used in this preparation as it forms a white insolu..

Calculate the volume at S.T.P. of 7.1g of chlorin..

Oxygen is the second most electronegative element, the first being fluorine. The electronegativity decreases on going down the group. This is due to increase in size of the atom..

Nitrogen is a non-metal. The non-metallic character of the VA group decreases on going down the group..

When the polymerization takes place at C 1 and C 4 of butadiene, an unbranched polymer is formed. This product is different from that formed from an alkene in having a double bond which at each of its carbons is substituted by different groups. Due to this the product can exist either ..