The Heating Curve

*1 atm = 760 mmHg = 29.92 inHg = 1013.2 hPa

1. The tip section of the time vs temperature graph represents the heating of the body of water from 0C to boil purpose. It takes 100 calories of animation to heat unity gram of water from 0C to 100C (Phase, 2005). Part of this thrust adds to the potential elan vital and part adds to the energising energy of the molecules. A large amount of the energy goes into alter the bonds between molecules. The Kinetic Molecular Theory states that atoms and molecules have an energy of motion that is measured as temperature. Atoms and molecules are constantly touching and the energy of these movements is measure as the temperature of the substance containing them. The more energy in a substance, the higher its temperature give be.

2. During the flat portions of the graph, a phase spay is occurring, first from ice to water (solid to liquid), and because from water to steam (liquid to gas). The heat of fusion of ice is 79.7 cal/gm and the heat of vaporization is 539 cal/gm (Phase, 2005). There is no change in temperature during these phase changes because the temperature is added to the molecules to help them break apart. As the energy is absorbed by these molecules, under the Kinetic Molecular Theory, they will gain enough energy to break apart from one another and undergo a phase

http://www.visionlearning.com/library/module_viewer.php?mid

Phase changes. (2005). Retrieved Aug. 19, 2005 from:

Carpi, A. Matter: States of matter. Retrieved Aug.

19, 2005 from:

intermolecular forces. (2003). Retrieved Aug. 19, 2005 from:

6. Water has a relatively high boiling point because of the strong intermolecular bonds it contains. It is a relatively small molecule, and the cutting edge der Waals forces are weak, but the v-shaped structure makes it a highly frozen molecule and it can form hydrogen bonds with neighboring molecules (Intermolecular, 2003). Because the atomic number 8 atom has a lone pair, and can bind dickens hydrogen atoms, each molecule can form quartette hydrogen bonds with other molecules, making the hydrogen bonding in water very extensive.

8. The boiling points would be expected to be lower in the Rocky Mountains than in San Diego because of the higher rhytidectomy and therefore lower atmospheric pressure.

The effects of pressure on boiling points. (2005). Retrieved Aug. 19, 2005 from:

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