Chapter 7 Chemistry Notes

Hg22 ag pb2 so42except group 2a pb2 mostly insoluble

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Unformatted text preview: soluble Group 2A) CO32- , PO43- Continue to read Chapter 7 and work on homework. Plan ahead For example: H2SO4 (aq) + Ba(OH)2(aq) 2H2O(l) + BaSO4(s) Breath contains CO2 (g) which can dissolve to form H2CO3 (aq) H2CO3 (aq) + Ca(OH)2 (aq) 2H2O (aq) + CaCO3(s) Egg shell is mainly CaCO3 (s). What do you expect to happen when an egg is placed in vinegar? H2O(l) + CO2(g) + HC2H3O2 (aq) + CaCO3 (s) Ca(C2H3O2)3 (aq) You need to work enough problems that you can quickly, confidently, and reliably: First balance chemical equations by hand (before inputing) Recognize soluble and insoluble ionic substances alone & in the context of a reaction Write molecular, complete, and net ionic reactions styles Recognize an acid & base (alone and in context). predict the products of an acid base reaction Including acid/base reactions that give ppt and gases as products. Friday: vinegar-egg, oxidation-reduction, & more categories. What happened to our egg? Chapter 7C - Chemical Reactions Oxidation-reduction (REDOX) Reactions Observations Electron transfer Examples Electrochemistry (batteries and fuel cells) Types of reactions Chapter Outline • • • Chemical Equations: Quest for Balance √ Solubility and electrolytes √ Types of Reactions: (by types of chemistry) • • • • • Precipitation & Solubility √ Acid-Base (H+, OH-) √ Gas Evolution (Bubbles) √ Oxidation-Reduction (electron transfer) ◄ Some Observations • • • Synthesis (Make Stuff, A + B AB) ◄ Decomposition (Destroy Stuff, AB A + B) ◄ Single Displacement (A + BC AC + B) ◄ Double Displacement (AB + CD AD + CB) Observed:____________________________________________ ____________________________________________________ Zn (s, metal) + HCl(aq) Types of Reactions: (by atom exchange pattern) • Zn (s, metal) + Cu(NO3)2(aq) Observed:____________________________________________ ____________________________________________________ http://www.youtube.com/watch?v=0fdbzEpm4DI base Ag+(aq) + glucose (aq) !! → ! Observed:______________________________________________ __________________________________________________ http://www.youtube.com/watch?v=oKETXMWtkBE&sns=em 7 9/27/2013 Making the Connection Copper/Zinc Copper(s) coats zinc & zinc ions diffuse into solution. Cu2+ Zn Making the Connection Copper/Zinc Copper(s) coats zinc & zinc ions diffuse into solution. Cu2+ Zn Cu2+ (s) Copper ions move in solution & can collide with Zn metal. e- Zn 2+ Zn e 2-electrons are transferred Cu2+ Copper ions move in solution & can collide with Zn metal. Cu(s) Zn2+ Macro/submicroscopic Relationships e-Zn2+ Zn e Zn2+ Cu(s) 2-electrons are transferred Zn Sub-microcopic Picuture Draw Zn(s) in HCl(aq) solution Zn Draw H2(g) and Zn2+ (aq) ions being formed Zn Zn How does Zn change?__________________________ How does H+ change?__________________________ 8 9/27/2013 Oxidation-Reduction Reactions (aka Redox Reactions) Examples of Redox-reactions Zn (s, metal) + Cu(NO3)2(aq) Cu(s, metal) + Zn(NO3)2(aq) Oxidation-reduction reactions involve the transfer of electrons. The element that becomes more positive is oxidized. For example: Zn(s) Zn2+ (aq) + 2 e- . Zinc atoms lose electrons and are therefore oxi...
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