BALANCING CHEMICAL REACTIONS: How do we get out what we put in? LAB BOOK?

Na3(PO4) + CaCl2 = Ca3(PO4)2 + NaCl Zn + Pb(NO3)2 = Zn(NO3)2 + Pb AlBr3 + Cl2 = AlCl3 + Br Na3(PO4) + CaCl2 = Ca3(PO4)2 + NaCl K (ClO3) = KCl + O2 Al + HCl = AlCl3 + H2 Ca (OH)2 + H3(PO4) = Ca3(PO4)2 + H2O Cu + H2(SO4) = Cu (SO4) + H2O + SO2 H2 + NO = H2O + N2

Writing Formulas

SiO2 Fe2O3 H2SO4 Mg(OH)2 C7 H5(NO2)3 Ca(H2PO4)2 C4 H10 C12 H22O11 3 NO2 = 3N 6O Ca(H2PO4)2 Ca = 1 2H2PO4 = 4H 2P 8O

In a balanced chemical equation, atoms are not lost or gained Basic Chemistry Copyright © 2011 Pearson Education, Inc.

Coefficient X subscript = # of each atom A. Na(s) + N2(g) → NaN3(s) 1Na 1Na 2N 3N not balanced B. C2H4(g) + H2O(l) → C2H5OH(l) 2C 2C 6H 6H 1 O 1 O . 2 3 2 Basic Chemistry Copyright © 2011 Pearson Education, Inc.

Coefficient X subscript = # of each atom

Equations with Polyatomic Ions Basic Chemistry Copyright © 2011 Pearson Education, Inc.

Balancing Chemical Equations STEP 1 Write an equation using the correct formulas in the reactants and products. MgCl2(aq) + Na3(PO4)1 (aq) NaCl(aq) + Mg3(PO4)2(s) STEP 2 Count the atoms (or ions) of each element in the reactants and products. Reactants Products 3Na+ 1Na+ not balanced 1 PO43 2PO43 not balanced 1Mg2+ 3Mg2+ not balanced 2Cl 1Cl not balanced

Balancing Chemical Equations STEP 3 Use coefficients to balance each element. 3MgCl2(aq) + 2Na3(PO4)1 (aq) 6NaCl(aq) + 1Mg3(PO4)2(s) STEP 4 Check the final equation for balance. Reactants Products 6Na+ 6Na+ 2PO43 2 PO43 3Mg2+ 3Mg2+ 6Cl 6Cl

Na3(PO4) + CaCl2 = Ca3(PO4) 2 + NaCl Zn + Pb(NO3) 2 = Zn(NO3) 2 + Pb AlBr3 + Cl2 = AlCl3 + Br Na3(PO4) + CaCl2 = Ca3(PO4) 2 + NaCl K (ClO3) = KCl + O2 Al + HCl = AlCl3 + H2 Ca (OH)2 + H3(PO4) = Ca3(PO4) 2 + H2O Cu + H2(SO4) = Cu (SO4) + H2O + SO2 H2 + NO = H2O + N2

Lab book

Lab book