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Study Quiz 3
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1
Which of the following is true of a cooling curve showing the conversion of liquid water to ice cubes?
A)Temperature is shown on the x-axis.
B)Temperature is shown on the y-axis.
C)It shows how the temperature of a substance changes as heat is added to it.
D)The average kinetic energy of the liquid water particles increases.
2
When gaseous water condenses to form liquid water,
A)the kinetic energy of the water particles changes
B)only potential energy changes
C)the temperature increases
D)the temperature decreases
3
Which of the following does not occur when liquid water freezes to form ice?
A)Potential energy changes.
B)The temperature stays the same.
C)The cooling curve for the change is flat.
D)The average kinetic energy of the particles changes.
4
The flat portion of a heating curve occurs
A)when the temperature is increasing
B)at either the melting point or the boiling point
C)when the kinetic energy of the particles is increasing
D)none of the above
5
How much heat is absorbed by 2.00 kg of water as it heats from 20°C to 100°C? C is 4.184 J/g°C and ∆Hvap is 40.7 kJ/mol
A)6.69 x  106J
B)9.2 x  106J
C)4.52 x 106J
D)6.69 x 105J
6
How much heat is absorbed by the water in question 5 if it vaporizes?
A)4.52 x 106J
B)4.52 x 105J
C)4.52 x 103J
D)6.69 x 105J
7
How much heat is absorbed by 2.00 kg of water at 20°C if it is heated until it is converted completely into water vapour?
A)5.2 x 103kJ
B)5.2 x 103J
C)4.52 x 106J
D)4.52 x 103J
8
Which of the following is not true?
A)When water vapour at 100°C condenses to liquid, the phase change releases a large amount of heat.
B)Liquid water at 100°C causes more severe burns than water vapour at 100°C.
C)When water vapour at 100°C condenses to liquid, the phase change absorbs a large amount of heat.
D)Both b and c





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