01 Notes - Heating and Cooling Curves

01 Notes - Heating and Cooling Curves - matter exist...

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Aim: How do we change between different phases of matter? QQ: What four items are you expected to bring to class every day? Do Now: What conditions can we manipulate in order to control the phase matter is in? Temperature: the average kinetic energy of the molecules in a substance, measured using a thermometer Use Kelvin or Celsius only! 273 + T C = T K Pressure: the force pushing down on a substance, measured using a barometer 1 atm = 760 torr = 760 mm Hg = 101.3 kPa Be able to convert between units! If the pressure is 1.50 atm, how many torr is that? Phase Diagrams: illustrate how changing the temperature and pressure can alter the phase of matter Critical Point: point where it is impossible to distinguish between a liquid and a gas (they are in equilibrium). After this point materials are called “super-critical fluids.” Triple Point: temperature and pressure conditions where all three phases of
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Unformatted text preview: matter exist simultaneously. Generally occurs at low temperatures and pressures. Heating/Cooling Curves: illustrate how changing the temperature can alter the phase of matter. When a substance is in a phase, adding energy increases the temperature. When a phase change occurs, energy is added, but the temperature remains constantwhy? The additional energy is used to break the intermolecular forces between molecules. Conclusions: T and P can be used to manipulate phase Different phases can be reached at a variety of temperature and pressure conditions At the triple point, all three phases of matter exist simultaneously Heating and cooling curves show the impact of temperature only on a substance At phase changes, temperature remains constant...
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