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Name ______________________________ Date ______________________ Section ____________ Introduction to Balancing Equations The Law of Conservations of Mass tells us that the total amount of matter is neither created nor destroyed during any physical or chemical change. Therefore, the mass stays the same before and after a chemical reaction. Chemical equations demonstrate this principle because they are always balanced. The total mass of the reactants must equal the total mass of the products. You can check to see if an equation is balanced by counting up the number of atoms- it has to be the same on each side of the equation. To balance an equation, you can adjust the coefficients until there are the same number of each type of atom on both sides. You are never allowed to change the smaller numbers that make up the chemical formulas. is bala See! This nced! N2 + 3 F2 2 NF3 6 ogens and and 2 nitr this side! n fluorines o s and 6 2 nitrogen n this side fluorines o Practice Balance each equation using the law of conservation of mass. There is a chart above each problem to help you. Use the chart to make sure that you have the same number of atoms on each side. the First- Count up s you number of atom e. Write currently hav the that number in sides of chart for both the equation. Second- If the numbers don’t m atch, try adjusting the coefficients one at at time. Make sure to change the num ber in the chart. ou can’t Remember- y mulas! change the for 1. Reactants Products H H O O ____ H2 2. + ____ O2 Reactants Products P P O O ____ P4 + ____ H2O ____ O2 ©2015 Adventures in Science ____ P2O3 You should do this in pencil! Reactants Products N H ____ N2 5. + Reactants Products N K K H Cl Cl ____ H2 4. ____ NH3 ____ K 6. + Reactants ____ Cl2 Reactants Products C C Ga Ga F F F F Br Br Cs Cs ____ KCl Products ___ CF4 + ___ Br2 ___ CBr4 + ___ F2 ___GaF3 + ___ Cs ___ CsF + ___ Ga 7. 8. Reactants Products Products Ag Ag Ba Ba N N S S O O Pt Pt Cu Cu F F ___ AgNO3 + ___ Cu ___ Cu(NO3)2 + ___ Ag 9. Reactants ___ BaS + ___ PtF2 ___ BaF2 + ___ PtS Reactants Products Na Na Mg Mg P P F F O O Li Li K K C C H H O O ___ Na3PO4 + ___ KOH ___ NaOH + ___ K3PO4 10. Reactants Products ___ MgF2 + ___ Li2CO3 ___ MgCO3 + ___ LiF ©2015 Adventures in Science 3. Answers Name ______________________________ Date ______________________ Section ____________ Introduction to Balancing Equations The Law of Conservations of Mass tells us that the total amount of matter is neither created nor destroyed during any physical or chemical change. Therefore, the mass stays the same before and after a chemical reaction. Chemical equations demonstrate this principle because they are always balanced. The total mass of the reactants must equal the total mass of the products. You can check to see if an equation is balanced by counting up the number of atoms- it has to be the same on each side of the equation. To balance an equation, you can adjust the coefficients until there are the same number of each type of atom on both sides. You are never allowed to change the smaller numbers that make up the chemical formulas. is bala See! This nced! N2 + 3 F2 2 NF3 6 ogens and and 2 nitr this side! n fluorines o s and 6 2 nitrogen n this side fluorines o Practice Balance each equation using the law of conservation of mass. There is a chart above each problem to help you. Use the chart to make sure that you have the same number of atoms on each side. the First- Count up s you number of atom e. Write currently hav the that number in sides of chart for both the equation. Second- If the numbers don’t m atch, try adjusting the coefficients one at at time. Make sure to change the num ber in the chart. ou can’t Remember- y mulas! change the for 1. Reactants Products H 4 H 4 O 2 O 2 2 H2 ____ 2. + ____ O2 Reactants 2 H 2O ____ Products P 4 P 4 O 6 O 6 ____ P4 + 3 O ____ 2 ©2015 Adventures in Science 2 PO ____ 2 3 You should do this in pencil! Reactants 4. Reactants Products N 2 N 2 K 2 K 2 H 6 H 6 Cl 2 Cl 2 ____ N2 5. Products 3 H ____ 2 + Reactants 2 NH ____ 3 Products 2 K ____ 6. ____ Cl2 + Reactants 2 KCl ____ Products C 1 C 1 Ga 1 Ga 1 F 4 F 4 F 3 F 3 Br 4 Br 4 Cs 3 Cs 3 2 Br ___ CBr + ___ 2 F ___ CF4 + ___ 2 4 2 3 Cs ___ 3 CsF + ___ Ga ___GaF3 + ___ 7. 8. Reactants Products Reactants Products Ag 2 Ag 2 Ba 1 Ba 1 N 2 N 2 S 1 S 1 O 6 O 6 Pt 1 Pt 1 Cu 1 Cu 1 F 2 F 2 2 AgNO3 + ___ Cu ___ Cu(NO3)2 + ___ 2 Ag ___ ___ BaS + ___ PtF2 ___ BaF2 + ___ PtS 9. 10. Reactants Products Reactants Products Na 3 Na 3 Mg 1 Mg 1 P 1 P 1 F 2 F 2 O 7 O 7 Li 2 Li 2 K 3 K 3 C 1 C 1 H 3 H 3 O 3 O 3 3 KOH ___ 3 NaOH + ___ K3PO4 ___ Na3PO4 + ___ 2 LiF ___ MgF2 + ___ Li2CO3 ___ MgCO3 + ___ ©2015 Adventures in Science 3.