in class practice
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Last updated 3 months ago
11 questions
1
How much heat is absorbed by 100 g of ice at –10˚C to become water at 20˚C?
How much heat is absorbed by 100 g of ice at –10˚C to become water at 20˚C?
1
A 200–g sample of water at 80˚C is heated to steam at 120˚C. How much heat does it absorb?
A 200–g sample of water at 80˚C is heated to steam at 120˚C. How much heat does it absorb?
1
How much heat is needed to change 2 kg of ice at -50˚C into steam at 150˚C?
How much heat is needed to change 2 kg of ice at -50˚C into steam at 150˚C?
1
An ice chest is filled with 10 lb (4.5 kg) of ice at 0˚C. How much heat does it absorb at the point where the ice completely melts?
An ice chest is filled with 10 lb (4.5 kg) of ice at 0˚C. How much heat does it absorb at the point where the ice completely melts?
1
A 40–g sample of chloroform is condensed from a vapor at 61.6˚C to a liquid at 61.6˚C by removing 9870 J of heat. What is the heat of vaporization of chloroform?
A 40–g sample of chloroform is condensed from a vapor at 61.6˚C to a liquid at 61.6˚C by removing 9870 J of heat. What is the heat of vaporization of chloroform?
1
If you add 25 g of ice at 0˚C to 366 g of water at 20˚C, to what temperature will the water drop as the ice melts and as the resulting water warms?
If you add 25 g of ice at 0˚C to 366 g of water at 20˚C, to what temperature will the water drop as the ice melts and as the resulting water warms?
1
To make iced tea, you start with 1 L of water initially at 90˚C. What minimum amount of ice at 0˚C is needed to cool the tea to 0˚C?
To make iced tea, you start with 1 L of water initially at 90˚C. What minimum amount of ice at 0˚C is needed to cool the tea to 0˚C?
1
How much heat needs to be added to 100 g of lead to just melt it if it starts at 20˚C? Lead melts at 327˚C.
How much heat needs to be added to 100 g of lead to just melt it if it starts at 20˚C? Lead melts at 327˚C.
1
How much heat needs to be added to 100 g of copper to just melt it if it starts at 20˚C? Copper melts at 1085˚C.
How much heat needs to be added to 100 g of copper to just melt it if it starts at 20˚C? Copper melts at 1085˚C.
1
How much dry ice (heat of fusion = 184 kJ/kg) needs to be added to 400 g of water at 20˚C to cool the water to 0˚C. Assume that once the CO2 sublimes it leaves the water and absorbs no additional heat.
How much dry ice (heat of fusion = 184 kJ/kg) needs to be added to 400 g of water at 20˚C to cool the water to 0˚C. Assume that once the CO2 sublimes it leaves the water and absorbs no additional heat.
1