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Chemistry 1-4 Test Review
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Terms in this set (21)
An 80.0-gram sample of water at 10.0C absorbs 1680 Joules of heat energy. What is the final temperature of the water?
15.0C
How much heat energy must be absorbed to completely melt 35.0 grams of H2O(s) at 0C?
11,700J
What is the total number of Joules of heat energy absorbed by 15 grams of water when it is heated from 30.0C to 40.0C?
q= (15)(4.18)(30-40)
q= 62.7
q=630J
A sample of water is heated from 10.0C to 15.0C by the addition of 126 Joules of heat. What is the mass of the water?
6.00g
What is the maximum number of grams of water at 10.0C that can be heated to 30.0C by the addition of 168 Joules of heat?
2.00g
A sample of water is cooled from 45C to 35C by the removal of 84 Joules of heat. What is the mass of the water?
2.0g
At 1 atmosphere of pressure, water and ice can exist in equilibrium at a temperature of
0C
The temperature of 50.0 grams of water was raised to 50.0C by the addition of 4200 Joules of heat energy. What was the initial temperature of the water?
30.0C
The heat energy required to change a unit mass of a solid into a liquid at constant temperature is called
heat of fusion
Approximately how many Joules of heat are needed to completely change 10.0 grams of ice to water at the melting point temperature?
3,340 J
What occurs when a substance melts?
It changes from solid to liquid, and heat is absorbed
The heat of fusion of a compound is 126 Joules per gram. What is the total number of Joules of heat that must be absorbed by a 15.0-gram sample to change the compound from solid to liquid at its melting point?
41.0 J/g
The heat if vaporization of a liquid is 1,340 Joules per gram. What is the minimum number of Joules needed to change 40.0 grams of the liquid to vapor at the boiling point?
53,600
As water vapor condenses at 100C, the potential energy of the molecules
decreases
At 1 atmosphere of pressure, 25.0 grams of a compound at its normal boiling point is converted to a gas by the addition of 34,400 Joules. What is the heat of vaporization for this compound, in Joules per gram?
1376 J/g
The average kinetic energy of water molecules is greatest in which of these samples?
10g of water at 55C
An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in
temperature
The temperature 30 K expressed in degrees celsius is
-243C
Which temperature is equal to +20 K
-253C
As ice melts at standard pressure, its temperature remains at 0C until it has completely melted. Its potential energy
increases
Which unit is used to express the energy absorbed or released during a chemical reaction?
joule
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