Unit 11: Classification of Chemical Reactions Cypress Creek HS: Chemistry 1L Chapter 10

Predicting Chemical Reactions Steps Determine what type of reaction is being presented Write the correct formulas for the product(s) Balance the equation Example: CaCl2 + Al(OH)3  ? Double-displacement reaction __CaCl2 + __Al(OH)3  __Ca(OH)2 + __AlCl3 3CaCl2 + 2Al(OH)3  3Ca(OH)2 + 2AlCl3

Predicting Chemical Reactions Practice Predict the chemical reaction from combining sodium iodide with strontium hydroxide: 2NaI(aq) + Sr(OH)2(aq)  2NaOH(aq) + SrI2(s) Predict the chemical reaction from combining magnesium and copper (II) sulfate: Mg(s) + CuSO4(aq)  Cu(s) + MgSO4(aq)

Activity Series DECREASING ACTIVITY Most Active Li Rb K Ca Na Mg Al Mn Zn Fe Ni Sn Pb H2 Cu Hg Ag Pt Au DECREASING ACTIVITY This feature is found on your handy helper. Use it to determine whether a single-displacement reaction will occur (react) or not. Active metals have a low electronegativity. They bond with nonmetals more readily because they are less stable by themselves. If a very active metal is competing with a less active metal to bond (with a nonmetal or negatively charged polyatomic ion), the more active metal will “win”. Think of it as a competing suitors who want to date the same girl! Least Active

    Activity Series DECREASING ACTIVITY Pb + MgSO4  PbSO4 + Mg  Most Active Li Rb K Ca Na Mg Al Mn Zn Fe Ni Sn Pb H2 Cu Hg Ag Pt Au DECREASING ACTIVITY Example #1: Is this combination possible? Pb + MgSO4  PbSO4 + Mg Answer: No, because Mg is more active than Pb Example #2: Is this combination possible? NaNO3 + K  Na + KNO3 Answer: Yes, because K is more active than Na       Least Active