Science: Chemical Reactions - Typing Practice Lesson
Balanced equations, reaction signs and pH
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In a chemical reaction, atoms rearrange to form new substances. Chemists write reactions as equations, with reactants on the left and products on the right: 2H2 + O2 -> 2H2O. Two molecules of hydrogen gas react with one of oxygen to make two molecules of water. The equation is balanced: there are 4 hydrogen atoms and 2 oxygen atoms on each side. Atoms are never created or destroyed in a reaction, a rule called the law of conservation of mass.
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Tip: Formulas
Formulas mix capitals and digits, like H2O and CO2. Keep Shift light and quick, and check each number.