Chemical Equations.

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Presentation transcript:

Chemical Equations

Chemical Equation Uses symbols and formulas to represent the products and reactants in a chemical reaction Equation must contain correct formulas of the reactants and the products

Word Equation Reactants and products represented by words Methane + Oxygen → Carbon dioxide + water “→” is read as yields

Formula Equation Formulas are substituted for words The equation below is the same as the last word equation with formulas instead CH4 + O2 → CO2 + H2O

Phases On Equations Phases of reactants and products can also be indicated in the equations (s) – solid (l) – liquid (g) – gas (aq) – aqueous (↑) – gas product (↓) – precipitate – solid product

Example HCl(aq) + Zn(s) → ZnCl2(aq) + H2(↑)

Law of Conservation of Matter Must always be satisfied in chemical reactions Number of each type of atom must be the same on both sides of the equation Atoms are neither created nor destroyed

Balancing Making the number of each type of atom the same on both sides of an equation Coefficient – whole numbers placed in front of the formulas You can only change coefficients when balancing – you can never change subscripts

Balance The Following CH4 + O2 → CO2 + H2O Fe + H2O → Fe3O4 + H2