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Chapter_05-Thermochemistry

# Chapter_05-Thermochemistry - General Chapter 5...

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Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Systems Open Closed Isolated Typical thermodynamic system: a cylinder with a gas.

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Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Perpetuum mobilus
Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Force, F – something that makes objects accelerate, i.e. change speed. SI unit: newton. F = m a 1 N = 1 kg 1 m/s 2 Work, W – the measure of the result of the force action. SI unit: joule. W = F d 1 J = 1 N 1 m Heat, Q – the energy passed through molecular motion. Unit: joule. Some basic definitions Pressure, P – a force per unit of surface. SI unit: pascal. P = F/S 1 Pa = 1 N/m 2

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Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Energy Kinetic (energy of motion) Potential (energy of position under influence of some force) mv 2 E= ----- 2 Gravitational E= mgh Electrostatic q 1 q 2 E= k----- d Energy forms can be converted one into another
Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Units of energy Unit of energy in SI units is joule . 1 J is energy needed to move an object along 1 m with a constantly applied force 1 N. (1N gives 1 kg body acceleration 1m/s 2 ). 1 J = 1 N * 1 m Widely used calorie is non-SI unit. One calorie is a heat needed to warm 1 g of water by 1 °C (at 14.5 °C) 1 cal = 4.184 J Both macroscopic energy and heat can be measured in J or cal.

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Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Heat flow Spontaneously heat flows from hotter systems to colder ones.
Chapter 5. Thermochemistry Chapter 5. Thermochemistry General General Internal energy of a system System looses internal energy to surroundings, E < 0 System gains energy from surroundings, E > 0 Internal energy of system, E – a sum of all kinetic and potential energies of all components of the system.

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Chapter_05-Thermochemistry - General Chapter 5...

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