Identify the following as a physical or chemical change: (a) water boils at 212 °F (b) applying an electric current to water causing the evolution of a gas (c) some metal statues obtain a green color after years of exposure to the atmosphere (d) evaporation of water from a saline solution leaves a solid salt residue
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.
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