Balancing Chemical Equations Can’t Create or Lose Atoms A A B B A A B B A A B B 2A + 2B  AB Not Balanced You must have the same number of each type of atom on each side of an equation.

Balancing Chemical Equations Can’t Create or Lose Atoms A A B B A A B B A A B B 2A + 2B  2AB Balanced You must have the same number of each type of atom on each side of an equation. A A B B

FORMATION OF WATER You must have the same number of each type of atom on each side of an equation. Hydrogen and Oxygen Combine to form water. Write and Balance this equation.

FORMATION OF WATER H 2 + O  H 2 0 You must have the same number of each type of atom on each side of an equation. Hydrogen and Oxygen Combine to form water. Write and Balance this equation.

FORMATION OF WATER H 2 + O  H 2 0 H H O O H H H H O O You must have the same number of each type of atom on each side of an equation. H H + Hydrogen and Oxygen Combine to form water. Write and Balance this equation.

HYDROGEN AND OXYGEN ARE DIATOMIC H 2 + O 2  H 2 0 H H O O H H H H O O H H + Have No Fear Of Ice Cold Beer O O

HYDROGEN AND OXYGEN ARE DIATOMIC H 2 + O 2  H 2 0 H H O O H H H H O O H H + Have No Fear Of Ice Cold Beer O O LEFTRIGHT HOHO

HYDROGEN AND OXYGEN ARE DIATOMIC H 2 + O 2  H 2 0 H H O O H H H H O O H H + Have No Fear Of Ice Cold Beer O O LEFTRIGHT HOHO 2221 You have to balance equations by changing Coefficients!

HYDROGEN AND OXYGEN ARE DIATOMIC H 2 + O 2  2H 2 0 Have No Fear Of Ice Cold Beer LEFTRIGHT HOHO 2221 You have to balance equations by changing Coefficients! H H O O H H H H O O H H + O O H H O O H H

HYDROGEN AND OXYGEN ARE DIATOMIC H 2 + O 2  2H 2 0 Have No Fear Of Ice Cold Beer LEFTRIGHT HOHO You have to balance equations by changing Coefficients! H H O O H H H H O O H H + O O H H O O H H

HYDROGEN AND OXYGEN ARE DIATOMIC 2H 2 + O 2  2H 2 0 Have No Fear Of Ice Cold Beer LEFTRIGHT HOHO You have to balance equations by changing Coefficients! H H O O H H H H O O H H + O O H H O O H H

HYDROGEN AND OXYGEN ARE DIATOMIC 2H 2 + O 2  2H 2 0 Have No Fear Of Ice Cold Beer LEFTRIGHT HOHO You have to balance equations by changing Coefficients! H H O O H H H H O O H H + O O H H O O H H H H H H

Ethylene and Oxygen form Carbon Dioxide and Water C 2 H 4 + O 2  CO 2 + H 2 0 LEFTRIGHT CHOCHO First we need to count atoms!

Ethylene and Oxygen form Carbon Dioxide and Water C 2 H 4 + O 2  CO 2 + H 2 0 LEFTRIGHT CHOCHO First we need to count atoms! H H O O C C O O H H H H H H C C C C H H H H O O O O O O

Ethylene and Oxygen form Carbon Dioxide and Water C 2 H 4 + O 2  2CO 2 + H 2 0 LEFTRIGHT CHOCHO First we need to count atoms! H H O O C C O O H H H H H H C C C C H H H H O O O O O O C C O O O O

Ethylene Oxygen form Carbon Dioxide and Water C 2 H 4 + O 2  2CO 2 + 2H 2 0 LEFTRIGHT CHOCHO First we need to count atoms! H H O O C C O O H H H H H H C C C C H H H H O O O O O O C C O O O O

Ethylene and Oxygen form Carbon Dioxide and Water C 2 H 4 + O 2  2CO 2 + 2H 2 0 LEFTRIGHT CHOCHO First we need to count atoms! H H O O C C O O H H H H H H C C C C H H H H O O O O O O C C O O O O H H H H O O

Ethylene and Oxygen form Carbon Dioxide and Water C 2 H 4 + 3O 2  2CO 2 + 2H 2 0 LEFTRIGHT CHOCHO First we need to count atoms! H H O O C C O O H H H H H H C C C C H H H H O O O O O O C C O O O O H H H H O O O O O O O O O O

Assignment Reactants = Products #Atoms of each element on Left = #Atoms of each element on Right Change ONLY the Coefficients (NEVER change subscripts!) Use a table or draw a picture if it helps. I recommend a grid or table. Remember: Have No Fear Of Ice Cold Beer Reactants = Products #Atoms of each element on Left = #Atoms of each element on Right Change ONLY the Coefficients (NEVER change subscripts!) Use a table or draw a picture if it helps. I recommend a grid or table. Remember: Have No Fear Of Ice Cold Beer LEFTRIGHT ELEMENTS Phet Physics: Balancing Chemical Equations Run in (HTML5) Introduction: 3 problems… 1)Make Ammonia N 2 + H 2  NH 3 2)Separate Water H 2 O  H )Combust Methane CH 4 + O 2  H 2 O +CO 2

Skeleton Equations to Balance Ca + O 2  CaO N 2 + H 2  NH 3 Fe + O 2  Fe 2 O 3 Cu 2 O + C  Cu + CO 2 H 2 O 2  H 2 O + O 2

Sample Equations to Balance Ca + O 2  CaO N 2 + H 2  NH 3 Fe + O 2  Fe 2 O 3 Cu 2 O + C  Cu + CO 2 H 2 O 2  H 2 O + O 2 2Ca + O 2  2CaO N 2 + 3H 2  2NH 3 4Fe + 3O 2  2Fe 2 2O 3 2Cu 2 O + C  4Cu + CO 2 2H 2 O 2  2H 2 O + O 2

Balancing Act Write and Balance the following equations. Hydrogen and Oxygen react to form water. Calcium hydroxide and sulfuric acid react to produce calcium sulfate and water. Aluminum and Oxygen combine to form Aluminum Oxide. Hydrochloric acid and solid sodium hydrogen carbonate form aqueous sodium chloride, water and carbon dioxide. Phosphoric Acid + Sodium Hydroxide yield sodium phosphate and water Hydrochloric Acid : HCl Sulfuric Acid H 2 SO 4 Phosphoric Acid:H 3 PO 4

Balancing Act Write and Balance the following equations. Hydrogen and Oxygen react to form water. Calcium hydroxide + sulfuric acid react to produce calcium sulfate and water. Aluminum and Oxygen combine to form Aluminum Oxide. Hydrochloric acid and solid sodium hydrogen carbonate form aqueous sodium chloride, water and carbon dioxide. Phosphoric Acid + Sodium Hydroxide yield sodium phosphate and water H 2 + O 2  H 2 0 2H 2 + O 2  2H 2 0 Ca(OH) 2 + H 2 SO 4  CaSO 4 + H 2 0 Ca(OH) 2 + H 2 SO 4  CaSO 4 +2H 2 0 Al  Al 2 O 3 4Al  2Al 2 O 3 HCl (aq) + NaHCO 3 (s)  NaCl (aq) + CO 2 (g) + H 2 0 (l) Already Balanced H 3 PO 4 + NaOH  Na 3 PO 4 + H 2 O H 3 PO 4 + 3NaOH  Na 3 PO 4 + 3H 2 O