States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Explain the recovery of Nickel from the Spent Catalysts.
Spent catalyst :
The catalysts which are used in the process of hydrotreating of different types of petroleum industries and are deactivated physically after numerous cycles and further they cannot be used again in same process. These deactivated catalysts , are discarded in the form of solid wastes and known as 'Spent catalyst '.
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