What is the chemical equation for the combustion of ethane (C2H6) ? PREDICTING PRODUCTS What is the chemical equation for the combustion of ethane (C2H6) ? 1) Unbalanced Equation: C2H6 + O2 → CO2 + H2O 2) Balanced Equation: 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

PREDICTION & Classification EXAMPLES… SrI2 (aq) + Br2 (g)→ SrBr2 (aq)+ I2 (s) Single Replacement BaCl2 (aq) + Na2SO4(aq) → BaSO4 (s) + 2 NaCl (aq) Precipitate H2 + Br2 → 2 HBr Synthesis Ba(ClO3)2 BaCl2 + 3 O2 Decomposition YOU ARE NOT REQUIRED TO PREDICT PRODUCTS FOR SYNTHESIS OR DECOMP RXNS  YOU WILL BE EXPECTED TO BE ABLE TO CLASSIFY THEM.

PREDICTING PRODUCTS – Practice ?’s What will be produced when aluminum is reacted with chromium (II) chloride? 1) Unbalanced Equation: Al + CrCl2 → AlCl3 (aq) + Cr (s) Single replacement 2) balanced equation: 2Al (s)+ 3CrCl2 (aq) → 2AlCl3 (aq) + 3Cr (s)

PREDICTION & CLASSIFICATION PRACTICE PROBLEMS… Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g) Single Replacement 2 AgNO3 (aq) +Na2CrO4(aq) → Ag2CrO4 (s)+ 2 NaNO3 (aq) Precipitate Cu + S → CuS Synthesis Al2(CO3)3 Al2O3 + 3 CO2 Decomposition YOU ARE NOT REQUIRED TO PREDICT PRODUCTS FOR SYNTHESIS OR DECOMP RXNS  YOU WILL BE EXPECTED TO BE ABLE TO CLASSIFY THEM.

Activity Series F2 Cl2 Br2 Foiled again – I2 Al loses to Ca! Halogen Element Reactivity Li Rb K Ba Ca Na Mg Al Mn Zn Cr Fe Ni Sn Pb H2 Cu Hg Ag Pt Au Activity Series Halogen Reactivity Ca F2 Cl2 Br2 I2 Foiled again – Al loses to Ca! Objectives: To explain the concept of an activity series for metals. To predict whether a single-replacement reaction occurs by referring to the activity series.

Examples of Activity Series Rxns Metal Reactivity Li Rb K Ba Ca Na Mg Al Mn Zn Cr Fe Ni Sn Pb H2 Cu Hg Ag Pt Au Examples of Activity Series Rxns Mg (s) + LiNO3 (aq) → NO REACTION! Zn (s)+ H2 SO4 (aq) → ZnSO4 (aq) + H2 (g) Cl2 (g) + 2 RbBr (aq) → 2 RbCl (aq) + Br2(g) Cl2 + 2 AlF3 → NO REACTION! F2 Cl2 Br2 I2 Halogen Reactivity