Chemistry_1031_day16_022609_actual

Chemistry_1031_day16_022609_actual - GENERAL CHEMISTRY I...

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GENERAL CHEMISTRY I CHE-1031 Dr. Jonathan M. Smith Friday, February 25
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Today Solutions to solutions… Precipitation reactions Acid-base chemistry Re-read Chapter 4 Mastering Chemistry
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Methane: CH 4 http://online.wsj.com/article/SB123561039911777481.html New Enemy in Climate Fight: Methane-Heavy Sheep Burps To convert more energy from grasses, livestock like cows and sheep have a unique digestions process that produces hydrogen, which microbes called methanogens convert into methane. That methane accounts for 48% of New Zealand’s greenhouse-gas emissions (compared to 10% in the US). No major breakthroughs in methane reduction yet, but the recent mapping of the methanogens’ genome holds promise for a less-flatulent future. Source: Wall Street Journal
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CHEMISTRY IN SOLUTIONS Chapter 4
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Example 4.10 – Write the equation for the precipitation reaction between an aqueous solution of potassium carbonate and an aqueous solution of nickel(II) chloride 1. Write the formulas of the reactants K 2 CO 3 ( aq ) + NiCl 2 ( aq ) 2. Determine the possible products a) Determine the ions present (K + + CO 3 2- ) + (Ni 2+ + Cl - ) b) Exchange the Ions (K + + CO 3 2- ) + (Ni 2+ + Cl - ) (K + + Cl - ) + (Ni 2+ + CO 3 2- ) c) Write the formulas of the products cross charges and reduce K 2 CO 3 ( aq ) + NiCl 2 ( aq ) KCl + NiCO 3
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