grade 6 chemistry

Six bond pairs in a molecule are distributed octahedrally around the central atom. A molecule having six bond pairs around its central atom has an octahedral shape. In a molecule of the type AB 6 , the six 'B' atoms are placed octahedrally around 'A'. Thus, ..

Balance other atoms except H and O a..

Calculate the mass of 0.4 moles of wate..

Calculate the number of moles of carbon dioxide present in 1.1 g of carbon dioxide. (C=12, O=1..

Carbon dioxide is readily absorbed by alkalis such as sodium hydroxide and potassium hydroxide, to form their respective carbonates. The above reaction of carbon dioxide with potassium hydroxide is used to purify air. When air is passed through a solution of potassium hydroxide, it absorbs ..

Student A B C Salt KNO 3 NaCl NaNO 3 Temperature 20 0 C 20 0 C 20 0 C Mass of water 100g 100g 100g Mass of salt used to saturate 31.6g 36g 88g What is the conclusion? The same mass of a solvent, at the same temperature, has the ability to dissolve,..

Baking powder is used in all the food preparations. The addition of baking powder during baking, produces carbon dioxide which, makes the dough "rise". The small pores in a loaf of bread are the spaces in which carbon dioxide was formed (Fig.11.13). ..

The elements of this family have high electron affinities. The values decrease down the group from sulphur to polonium. Oxygen unexpectedly has low electron affinity. This is attributed to the small size of oxygen atom so that its electron cloud is distributed over a small region of space and ther..

i) Nylons are insoluble in common solvents, have good strength and absorb little moisture. ii) It is used for tyre cords, fabrics, ropes, carpets and manufacture of garmen..

H 2 N - (CH 2 ) 6 - NH 2 is the compound which is a raw material in the production of polymers. A number of N containing compounds which act as bases occur in nature These are known as alkaloids. In these compounds nitrogen may be present in the form of primary, secondary and tertiary ..