Go Figure How do the molecules of a compound differ from the molecules of an element? (a) Atoms of an element (b) Molecules of an element (c) Molecules (d) Mixture of elements and a compound of a compound Elements are composed of only one kind of atom. Compounds must have at least two kinds of atoms. Figure 1.5 Molecular comparison of elements, compounds, and mixtures.
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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