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.
How to determine the density of various substances ?
Density: It is defined as the ratio of mass and volume of a substance. Generally, the unit of density is gram per centimetre cube () but the S.I unit of density is .
Here, mass is expressed in grams and volume is expressed in centimetre cube .
Formula used to determine the density of a substance is:
Where,
is density of substance
is mass of substance
is volume of substance
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