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Daily Science pg. 100

Daily Science pg. 100. What is STP? Use the reaction shown below to answer the questions: CO + NO  N 2 + CO 2 Balance the equation What is the volume ratio of carbon monoxide to carbon dioxide in the equation?

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Daily Science pg. 100

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  1. Daily Science pg. 100 • What is STP? • Use the reaction shown below to answer the questions: • CO + NO  N2 + CO2 • Balance the equation • What is the volume ratio of carbon monoxide to carbon dioxide in the equation? • If 42.7 g of CO is reacted completely at STP what volume of N2 gas will be produced? • Finish working problems on the worksheet from last class

  2. Energy and chemical change Pg. 101

  3. Energy The ability to do work Energy is conserved Energy stored in a substance because of its composition- chemical potential energy Most energy is released in heat Heat flows from warmer to cooler; symbol- q

  4. Measuring heat Metric system- calorie Calorie- the energy required to raise the temp of 1g of pure water, 1 oC SI unit- joule 1 J = 0.2390 cal 1 cal= 4.184 J

  5. Specific heat The amount of heat required to raise the temperature of 1g of that substance by 1 degree C. Unique to a substance, symbol - c Water- 4.184 J/ (g x oC)  gold is only 0.129 Mass and temp affect the heat absorbed and released q = c xm xΔT

  6. Example If the temperature of 34.4 g of ethanol increases from 25.0 oC to 78.8 oC, how much heat has been absorbed by the ethanol (c= 2.44 J/ (g x oC)? A 155 g sample of an unknown substance was heated from 25.0 C to 40.0 C. The substance absorbed 5696 J of energy. What is the specific heat of the substance?

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