Science

Table B

Table B (part 1)

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• Heat of Fusion = Melting or Freezing
• water(s) ➞ water (l) water (l) ➞ water (s)
• - If grams are given, multiply 334 to see how much total energy. (for melting its +, for freeze its -)
• -If total energy is given, divide by 334 to find grams.
• Heat of Vaporization = Vaporizing or Condensing
• water(l) ➞ water (g) water (g) ➞ water (l)
• - If grams are given, multiply 2260 to see how much total energy. (for vaporizing its +, for condensing its -)
• -If total energy is given, divide by 2260 to find grams

Table B (part 2)

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• Specific Heat Capacity of H2O (l) = How much energy to change temperature.
• - If looking for total energy times temperature change and 4.18.
• - If total energy is given, divide by 4.18 and the info given.

Table H

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• Rules:
• To find the vapor pressure at a specific temperature, move to that temperature until you cross the point on the curve. Reading across gives the vapor pressure.

Measuring Gases

• 3 Things you Need to Know to Measure a Gas:
• -Volume = the amount of space that a substance or object occupies, or that is enclosed within a container, especially when great.
• -Temperature = the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
• -Pressure = continuous physical force exerted on or against an object by something in contact with it.
• FORMULA: Pressure = Force/Area

Boyle's Law

• As weights are added, the gas particles occupy a smaller volume. The pressure increases.
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Pressure and Temperature

• As gas is heated, the particles move faster and collide more often with each other and with the walls of their container. The pressure of the gas increases.
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Charles' Law

• Changing the temperature of a gas at constant pressure changes the volume similarly.
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