grade 9 chemistry programmes

Calculate the gram molecules present in 45g of wate..

The molecular formula is then obtained by Molecular formula = n x Empirical form..

Carbon dioxide is used in the manufacture of compounds like sodium carbonate, sodium hydrogen carbonate, white lead [Pb(OH) 2 . PbCO 3 ], etc. In the manufacture of sugar it is used to precipitate lim..

. The green chemistry programme is now a world wide effort of many governments, academia, scientific societies, industry, trade organizations, small business, non government organizations, research centers and other government agencies to promote the use of chemistry f..

These cells are based on methanol oxygen fuels and are another significant achievement of the green chemistry programme. These cells are for use in cellular phones and last for the full lifetime of the phon..

These are devices which convert the energy produced during the combustion of fuels like H 2 , CO and CH 4 directly into electrical energy. The most successful fuel cell is the H 2 -O 2 fuel cell. It was used in the Apollo space programme and the water produced used as drinking water for t..

Half-life period of a nuclide The time taken to reduce the number of nuclei to one half the origina..

There are seven periods in the periodic table and each period starts with a different principal quantum number. The first period corresponding to 'n' = 1 consists of only two elements hydrogen (1s 1 ) and helium (1s 2 ). This is because the first energy shell has only one orbital (1s), which can a..