Balancing, Writing, and Naming Equations Balancing Equations Balancing, Writing, and Naming Equations
Balancing Equations Balancing equations is based on the Law of Conservation of Matter: In a chemical reaction, matter can be neither created nor destroyed.
Balancing Equations Paraphrase: Law of Conservation of Atoms: The number of atoms of each type of element must be the same on each side of the equation. In a chemical reaction, the amount of reactants equal the amount of products.
Rule 1: The subscripts cannot be changed Hydrogen + oxygen water H2 + O2 H2O If the subscripts are changed, the compound wouldn’t be the same. Ex. H20 = water Ex. H2O2 = hydrogen peroxide
Deciding If It’s Balanced H2 + O2 H2O Draw a table. Count the atoms on each side. Are the reactant and product totals the same?
Deciding If It’s Balanced Nitrogen + hydrogen ammonia N2 + 3 H2 2 NH3 Draw a table. Count the atoms on each side. Are the reactant and product totals the same?
Deciding If It’s Balanced Ca3(PO4)2 + 3 H2SO4 2 CaSO4 + 2 H3PO4
Deciding If It’s Balanced 2 Cu + 2 H2SO4 CuSO4 + 2 H2O +SO2
Deciding If It’s Balanced Nickel + hydrochloric acid Nickel(II) chloride + hydrogen 2 Ni + 3 HCl NiCl2 + H2
STOP DAY 1
Review On what law is balancing equations based? What is rule number one when it comes to balancing equations? Why?
Review Decide if the following equation is balanced. 2 C6H6 + 15 O2 6 H2O + 12 CO2
Target: I can balance a simple chemical equation
Balancing Equations H2 + O2 H2O If the subscripts cannot be altered, how can the atoms be made equal? Adjust the number of molecules by changing the coefficients.
Balancing Equations H2 + O2 H2O Count the atoms in the initial equation. Add coefficients and recount.
Balancing Equations Balancing hints: Balance the metals first. Balance the other atoms. Save the oxygen and hydrogen until the end.
Balancing Equations H2 + O2 H2O Count the atoms in the initial equation. Add coefficients and recount.
Balancing Equations N2 + H2 NH3 Count the atoms in the initial equation. Add coefficients and recount.
Balancing Equations Ca3(PO4)2 + H2SO4 CaSO4 + H3PO4 Count the atoms in the initial equation. Add coefficients and recount.
Balancing Equations Cu + H2SO4 CuSO4 + H2O + SO2 Count the atoms in the initial equation. Add coefficients and recount.
Balancing Equations Balancing hints: Balance the metals first. Balance the other atoms. Save the oxygen and hydrogen until the end.
Balancing Equations This method of balancing equations is the inspection method. The method is trial and error. You must know if an equation is not balanced. Practice. Section 1: #2, 4, 5, 7, 8, 11, 12, 13
STOP Day 2
Nickel + hydrochloric acid Nickel(II) chloride + hydrogen Do Now Nickel + hydrochloric acid Nickel(II) chloride + hydrogen Write the corresponding formula equation and then balance the equation.
Predict the products and balance the following equation Predict the products and balance the following equation. __ C4H8 + __ O2 Do Now 04/12/2013
1) Na3PO4 + KOH NaOH + K3PO4
2) MgCl2 + Li2CO3 MgCO3 + LiCl
3) C6H12 + O2 CO2 + H2O
4) Pb + FeSO4 PbSO4 + Fe
5) CaCO3 CaO + CO2
6) P4 + O2 P2O3
7) RbNO3 + BeF2 Be(NO3)2 + RbF
8) AgNO3 + Cu Cu(NO3)2 + Ag
9) C3H6O + O2 CO2 + H2O
10) C5H5 + Fe Fe(C5H5)2
11) SeCl6 + O2 SeO2 + Cl2
12) MgI2 + Mn(SO3)2 MgSO3 + MnI4
13) ___ NO2 ___ O2 + ___N2
Section 2 1) __ C6H6 + __ O2 __ H2O + __ CO2
Section 2 2) __ NaI + __ Pb(SO4)2 __ PbI4 + __ Na2SO4
Section 2 3) __ NH3 + __ O2 __ NO + __ H2O
Section 2 4) __ Fe(OH)3 __ Fe2O3 + __ H2O
Section 2 5) HNO3 + Mg(OH)2 H2O + Mg(NO3)2
Section 2 6) H3PO4 + NaBr HBr + Na3PO4
Section 2 7) C + H2 C3H8
Section 2 8) CaO + MnI4 MnO2 + CaI2
Section 2 9) __ Fe2O3 + __ H2O __ Fe(OH)3
Section 2 10) __ C2H2 + __ H2 __ C2H6
Section 2 11) __ VF5 + __ HI __ V2I10 + __ HF
Section 2 12) OsO4 + PtCl4 PtO2 + OsCl8
Section 2 13) __ CF4 + __ Br2 __ CBr4 + __ F2
Section 2 14) __ Hg2I2 + __ O2 __ Hg2O + __ I2
Section 2 15) __ Y(NO3)2 + __ GaPO4 __ YPO4 + __ Ga(NO3)2
Section 2 __ C6H6 + __ O2 __ H2O + __ CO2
Section 2 __ C6H6 + __ O2 __ H2O + __ CO2