What is called sublimation?
If a solid substance converts to a gaseous substance due to the application of heat and converts to solid directly due to cooling, then the substance is called volatile substance and the process is called sublimation.
Chemistry
Formula of baking powder?
The formula of baking powder is NaHCO3.
First law of Mendeleev
Arranging the elements based on their molecular weight, their physical and chemical properties are noticed to periodically reoccur.
Why chemistry is called the key science?
Other branches of science are related to chemistry. Chemistry is used in medical science to understand the life, etiology of disease and cure them, etc. Physics works with matters, which are made up with atoms, molecules, etc. Therefore, physics needs chemistry. Semi-conductor, chips, LCD crystals of computer science are chemistry. Hence it is called the … Read more
What is diffusion?
The process of spreading solid, liquid, or gaseous substances spontaneously and uniformly in a medium is called diffusion. Diffusion is the net passive movement of molecules or particles from regions of higher to regions of lower concentration. For diffusion to occur there must be a concentration gradient. To define diffusion in the biological context, imagine … Read more
What is effusion?
The passage of gases from a region of high pressure to a region of low pressure through fine pores is called an effusion.
Why are the melting point and boiling point different for the same matter?
When a solid substance is heated, it is converted to liquid, and due to further application of heat, it is converted to the gaseous substance. For example, when ice is heated, it melts at 0°C temperature and converts to water. And when the temperature of 0°C water is increased, it boils at 100°C temperature and converts … Read more
What is distillation?
The process of heating a liquid into vapour and then retrieving the liquid from the vapour by cooling it is called distillation.