1. Mr. Quinn & Ms. TomFebruary 6, 2014 Aim: How do we predict the amount of product formed in a chemical reaction? Do Now: balance the following chemical equation. ___ H 2 SO 4 + ___ B(OH) 3  __ B 2 (SO 4 ) 3 + ___ H 2 O

2. Why balance equations? The most common reason is to determine the amounts of products you will create from a chemical reaction

3. The Steps 1.Balance the equation 2.Collect relevant information (including molar mass) 3.Convert from amount of reactant to amount of product using dimensional analysis “Balance-grams-moles-moles-grams”

4. Example 1: Getting’ Paid! $20 bills can be converted to $5 bills according to the following balanced financial equation. If you have $40 in “twenties,” how many $5 bills would you expect to receive if you exchange them at a bank? 1 $20 bill  4 $5 bill

5. Example 2: Soda The carbonation in soda comes from the decomposition of carbonic acid, according to the following balanced chemical equation. If each can of soda contains 2.77 g of H 2 CO 3, how much CO 2 is in each can? H 2 CO 3  CO 2 + H 2 O

6. Example 3: Soda Again One day at the soda factory, your boss asks if you can increase the amount of carbonic acid in a can of soda to 3.1 g. If more than 2.0 g of CO 2 are in a can of soda, it will explode. What should you tell the boss? H 2 CO 3  CO 2 + H 2 O

7. Example 4: Danger? Fluorine gas reacts with aluminum according to the following unbalanced chemical equation. It is very dangerous to create more than 4.7 g of AlF 3 at a time. If you add an excess of aluminum to 3.5 g of fluorine gas, will the resulting reaction be dangerous? Al + F 2  AlF 3

8. Your Turn!