Honors Thermochemistry Study Guide 2023 (no Gibbs) KEY

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Arizona State University *

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Chemistry

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Dec 6, 2023

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Honors Thermochemistry Study Guide 1. What is the heat capacity for water in calories & Joules? 1cal/g°C & 4.184 J/g°C 2. Define temperature. The average kinetic energy of a substance. 3. Define enthalpy. A measure of the total energy of molecular motion in a system. Enthalpy can be transferred between objects at different temperatures. Enthalpy depends on mass, temperature is independent of mass!! 4. List the units enthalpy. Joules or calories 5. Explain the difference between endothermic and exothermic processes. Endothermic: + Δ H, heat absorbed, PE products > PE reactants Exothermic: - Δ H, heat released, PE reactants > PE products 6. Define heat capacity. The amount of heat/enthalpy required to raise the temperature of 1g of a substance 1 ℃ . 7. How is Δ H calculated in calorimetry? Δ H = (mass)( Δ T)(Cp) 8. Define closed system. energy can escape, matter cannot 9. Define isolated system. neither matter nor energy can escape
Honors Thermochemistry Study Guide 10. Identify the following in the potential energy diagram above: A. Activation energy (Ea) forward reaction B. PE reactants C. Δ H D. PE activated complex E. Activation energy (Ea) reverse reaction F. PE products 11. How would an endothermic reaction differ from the diagram above? The products would have a higher PE than the reactants 12. How many joules are needed to warm 25.5 grams of water from 14.0 0 C to 22.5 0 ? Δ H = (25.5)(22.5 – 14.0)(4.18) = + 906J 13. Calculate the number of joules released when 75.0 grams of water are cooled from 100.0 0 C to 27.5 0 C.
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