Two or more substances in variable proportions, where the composition is constant throughout are a compound. an element. a heterogeneous mixture. a homogeneous mixture. a crystalline solid.
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.
A compound is a chemical species that is formed when two or more atoms join together chemically, with covalent or ionic bonds.
Compounds may be categorized according to the type of chemical bonds holding the atoms together:
- Molecules are held together by covalent bonds.
- Ionic compounds are held together by ionic bonds.
- Intermetallic compounds are held together by metallic bonds.
- Complexes are often held together by coordinate covalent bonds.
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