Chemistry – Mar 1, 2018 Agenda Homework review Gas forming reactions Get out Driving Forces 1 For a HMK Check P3 Challenge –nomenclature quiz M or N Objective – Driving forces continued Assignment: Driving Forces Worksheet 2 Agenda Homework review Gas forming reactions Electron Transfer After HMK Check, find your assigned problem to share. Writers put their answers up, checkers fix it. OR If neither has it, work together to solve. Nate and Hiep are free agents to help or fill in if someone is absent.

3) Formation of a gas If a gas is produced, it will the driving force. Acid base reactions, decomposition reactions, and combustions often form gases. Common gases are CO2, NO2, SO2, NH3, H2S, H2, N2, O2, F2, Cl2 (memorize these) If a product is a gas, then gas formation is a driving force. Ex: K2CO3 (s)  K2O (s) + CO2(g)

4) Transfer of electrons: Oxidation-Reduction How to identify a redox reaction Is there an atom that is an element on one side and in a compound on the other side? (often Single Replacement reactions) Is there an element that has a different charge ion on both sides? (Many synthesis and decomposition reactions.) Transfer of electrons is a driving force. Elements are driven to complete octets. Note: All combustion reactions are driven by electron transfer.

Activity Series For single replacement reactions, the determining factor is the place of the two metals in the activity series. In general, a metal can displace any of the metals which are lower in the activity series: Ex: Cu + AgNO3  Cu(NO3)2 + Ag Ex: Cu + Fe(NO3)3  Cu (NO3)2 + Fe Ex: Zn + Fe(NO3)3  Zn (NO3)2 + Fe

Reactivity Series for Halogens In general, a halogen can displace any of the halogens which are lower in the activity series for halogens. Notice that the activity series of halogens is just their order within the periodic table. Ex: F2 + 2 NaBr  2 NaF + Br2 Ex: Br2 + 2 NaCl  2 NaBr + Cl2

Practice ID driving forces Balance, ID type, ID driving force _____1. _____H3PO3  _____H3PO4 + _____PH3 _____2. _____Fe2O3 + _____C  _____CO + _____Fe _____3. _____FeS + _____O2  _____Fe2O3 + _____SO2 _____4. _____NH3 + _____O2  _____NO + _____H2O _____5 ._____Si + _____S8  _____Si2S4

More Practice ID driving forces _____6. _____Hg2CO3  _____Hg + _____HgO + _____CO2 _____7. _____SiC + _____Cl2  _____SiCl4 + _____C _____8. _____Al4C3 + _____H2O  _____CH4 + _____Al(OH)3 _____9. _____V2O5 + _____HCl  _____VOCl3 + _____H2O _____10. _____Ag2S + _____KCN  _____KAg(CN)2 + _____K2S

Exit Slip - Homework Exit Slip: Write the complete ionic equation then determine the net ionic equation for: NiCl2 (aq) + 2 KOH (aq)  Ni(OH)2 (s) + 2 KCl (aq) What’s Due? (Pending assignments to complete.) Finish Driving forces Worksheet 1 Driving Forces Worksheet 2 What’s Next? (How to prepare for the next day) Read p473, p286-288, p548-549, p280-282