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BALANCING CHEMICAL EQUATIONS DAILY OBJECTIVE • The students will apply the law of conservation of mass to balance a chemical reaction. KEY TERMS 1. Chemical Equation: A representation of a chemical reaction that uses symbols to show relationships between reactants and products. 2. Reactants: A substance or molecule that participates in a chemical reaction. -What you start with -Left side of arrow 3. Products: A substance that is formed in a chemical reaction. -What you end with -Right side of arrow LABEL THE PARTS + + Methane + Oxygen CH4 + O2 Carbon Dioxide + Water CO2 + H 2O LAWS OF SCIENCE • Law of Conservation of Mass: Mass cannot be created or destroyed, it can only change forms. • Mass has to be the same on both sides of the reaction • The number of atoms has to be the same for the products and reactants. • What you start with, you must end with VIOLATION OF THE LAW OF CONSERVATION OF MASS CH4 + Reactants C= H= O= O2 CO2 + H2 O Check the Number of Atoms: Products C= H= O= HOW TO BALANCE EQUATIONS 1. You MUST have the SAME number of atoms of each element on the right and left hand side of the arrow. 2. You CANNOT change the chemical formulas. 3. LEAVE THE SUBSCRIPTS ALONE!! 4. To balance an equation we have to use coefficients (numbers placed in front of the compounds or elements). COEFFICIENTS • Coefficients go in front of a compound 4H2O -All atoms in a compound are multiplied by the coefficient Number of atoms: HydrogenOxygen- PRACTICE WITH COEFFICIENTS *List the amount of each atom in the 6 substances below: 4CH4 2O2 3Ni(NO3)2 3NH3 6HF 4Ca3(PO4)2 STEPS TO FOLLOW TO BALANCE EQUATIONS 1. Determine the number of atoms for each element. 2. Pick an element that is not equal on both sides of the equation. 3. Add a coefficient in front of the formula with that element and adjust your counts. 4. Continue adding coefficients to get the same number of atoms of each element on each side. LET’S PRACTICE Mg + O2 MgO Mg = Mg = O= O= MORE PRACTICE CH4 + O2 CO2 + C= C= H= H= O= O= H2O LET’S TRY ONE MORE Na2S + AgNO3 NaNO3 + Na = Na = S= S= Ag = Ag = N= N= O= O= Ag2S