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.
can you explain the difference between a physical and chemical change?
Physical change :
When the physical state of the matter changes, it is physical change
Chemical change :
When a substance reacts to give one or more new substances, then it is chemical change.
For example-
- When we boil water, it changes into vapour, and if we freeze water, it will change into ice. Thus, only the physical state of water changes from liquid to solid, or gas. So, it is a physical change.
- When we put vinegar into milk, it gets clumped up and separates from liquid. Here composition of milk changes. So it is chemical change.
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