Chemical Reactions
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| molecule | a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
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| chemical bond | Any of several forces, especially the ionic bond, covalent bond, and metallic bond, by which atoms or ions are bound in a molecule or crystal.
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| chemical formula | A chemical formula is an expression which states the number and type of atoms present in a molecule of a substance. The type of atom is given using element symbols. The number of atoms is indicated by a subscript following the element symbol.
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| compound | a substance formed when two or more chemical elements are chemically bonded together. Two types of chemical bonds common in compounds are covalent bonds and ionic bonds.
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| element | are chemically the simplest substances and hence cannot be broken down using chemical methods.
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| chemical reaction | A process in which atoms of the same or different elements rearrange themselves to form a new substance.
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| reactant | a substance that takes part in and undergoes change during a reaction.
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| product | a substance that is formed as the result of a chemical reaction
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| open system | a system that freely exchanges energy and matter with its surroundings.
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| closed system | a thermodynamic system in which mass is conserved inside the system but energy enters and leaves the system freely.
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| Law of Conservation of Mass | states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants
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