Category Archives: chemistry

Bases like PbO, HgO, CuO do not dissolve in water.

Acid contains hydrogen ions (H+ ions). These ions stimulate the taste buds of our tongue that detects sour taste. Therefore, the taste of acid is sour.

Avogadro’s number is the number of particles (atoms,molecules or ions) in one mole of a substance.It is 6.023×10^23.

Iron becomes non magnetic when heated above 770°C. The temperature at which the substance loses its magnetism is called Curie point. High temperature disturbs the process of magnetism i.e, when the iron is heated,the atoms of the iron are vibrated with higher kinetic energy and loses the ability to be magnetized. Higher K.E.(random motion ofContinue reading “Why does iron(or other magnetic substance) loses their magnetism when heated?”

Though aluminium is a quite reactive metal it doesn’t react with the food.This is due to the presence of an inert aluminium oxide layer on its surface which if formed when an aluminium pot is produced, the surface is oxidized instantly (aluminium combine with the oxygen of air). This thin but strong layer prevents theContinue reading “Though aluminium is a quite reactive metal,the food in aluminium pot doesn’t react with the pot, why?”

We use impure granulated zinc over metallic zinc because granulated zinc has impurities of copper which acts as positive catalyst and increases the rate(speed) of reaction. Pure zinc reacts very slowly with dilute hydrochloric acid.

Oxyhydrogen is a mixture of hydrogen and oxygen gases. This gaseous mixture is used for torches to process refractory materials and was the first gaseous mixture used for welding.Oxyhydrogen flame producing device: