The Chemical Context of Life
I. Chemical Elements and Compounds
A. Matter consists of chemical elements in pure form and combinations called compounds.
&lt;Tab/&gt;1. Matter is anything that takes up space and has mass.
2. An element is a substance that cannot be broken down into other substances by chemical reactions.
&lt;Tab/&gt;&lt;Tab/&gt;a. Every element has its own symbol.
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D. Opposite headed arrows indicated that a reaction is reversible.
E. One of the factors affecting the rate of reaction is the concentration of the reactants.
1. The greater the concentration of reactant molecules, the more frequently they collide with one another and have an opportunity to react to form products, and vice versa for the products.
F. The point at which a reaction offsets another exactly is called a chemical equilibrium.