HEAT OF VAPORIZATION CALCULATIONS FEBRUARY 26, 2015.

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Presentation transcript:

HEAT OF VAPORIZATION CALCULATIONS FEBRUARY 26, 2015

SCIENCE STARTER DO THE SCIENCE STARTER TAKE 3 MINUTES YOU ARE SEATED AND SILENT

AIM Can the heat of fusion formula be utilized to calculate the amount of heat required when heating water from 40˚C to 60˚C?

SCIENCE STARTER REVIEW 1. The heat of fusion of a substance is the energy measured during a a)Phase change b)Temperature change c)Chemical change d)Pressure change

2. Different masses of copper and iron have the same temperature. Compared to the average kinetic energy of the copper atoms, the average kinetic energy of the iron atoms is a)Less b)Greater c)The same

3. The number of calories per gram required to melt ice at its melting point is called a)Sublimation b)Vapor pressure c)Heat of vaporization d)Heat of fusion

4. As the temperature of a liquid increases, its vapor pressure a)Decreases b)Increases c)Remains the same

5. Which sample of water has the greatest vapor pressure? a)10.0 ml at 62ºC b)20.0 ml at 52ºC c)30.0 ml at 42ºC d)40.0 ml at 32ºC

1. What is total number of joules released when a 5.00 gram sample of water changes from liquid to solid at 100ºC?

2. How many joules of heat energy are released when 50 grams of water at 373K are completely vaporized?

3. The heat of vaporization for water is 540 calories per gram. What is the minimum number of calories needed to change 40.0 grams of water at 100ºC to steam at the same temperature and pressure?

SUMMARY You were introduced to heat of vaporization calculations

INDEPENDENT WORK LOG ONTO Go to Weekly Assignment Go to Week of Feb 23 – 27 ▫What you need to complete this week  Reading and questions  Vocabulary  Notecard  Homework  Project  AIM PROMPT – must complete each day