Ch 12. Learning Objectives The Physical States of Matter
Ch 12. Learning Objectives The Physical States of Matter
Ch 12. Learning Objectives The Physical States of Matter
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Boiling point<br />
Boiling point is the temperature at which the vapor pressure <strong>of</strong> liquids<br />
equals the atmospheric pressure. Also known as the normal boiling<br />
point. (at 1 atm).<br />
How is boiling point affected with altitude?<br />
What will happen if we continuously<br />
supply heat to a boiling liquid?<br />
Trivia:<br />
Water boils at 68 o C on Mount<br />
Everest.<br />
Melting point<br />
Melting point occurs at the temperature at which the solid and<br />
liquid phases <strong>of</strong> a substance are in dynamic equilibrium.<br />
H 2 O (s) H 2 O(l). Endothermic process.<br />
When considered as the temperature <strong>of</strong> the reverse change from<br />
liquid to solid, it is referred to as the freezing point.<br />
Trivia:<br />
In organic chemistry Carnelley’s Rule established in 1882 by<br />
Thomas Carnelley, states that high molecular symmetry is<br />
associated with high melting point. He based his rule on<br />
examination <strong>of</strong> 15,000 chemical compounds !!!<br />
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