Writing Chemical Equations

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Chemical Equations, Word Equations and Balancing

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Presentation transcript:

Writing Chemical Equations Chapter 8

Chemical Equations Chemical equation Chemical reaction Chemical Equations are a chemist shorthand expression for describing a chemical change (Chemical reaction). Chemical Reaction is when one or more substances (reactants) are changed to new/different substances (products) Reactants Products A chemical reaction shows the over all change of reactants to products. The arrow indicates some change that occurs as a result of the process.

Steps to Write Chemical Equations Sample Problem In a precipitation reaction, sodium hydroxide solution is mixed with iron (II) chloride solution. Sodium chloride and insoluble iron (II) hydroxide are produced. Write the balance chemical equation, including the state symbols. Step 1 : Identify the Reactants and products and place them in a word equation. sodium + Iron (II) Sodium + Iron (II) hydroxide chloride chloride hydroxide

Step 2: Convert chemical names into chemical formulas and write the state symbols. NaOH (aq) + FeCl2 (aq) NaCl (aq) + Fe(OH)2 (s) Step 3: Balance the chemical equation 2NaOH (aq) + FeCl2 (aq) 2NaCl (aq) + Fe(OH)2 (s)