Question

(a)

How much heat transfer (in kcal) is required to raise the temperature of a 0.700 kg aluminum pot containing 1.50 kg of water from 35.0°C to the boiling point and then boil away 0.800 kg of water?

? kcal

(b)

How long (in s) does this take if the rate of heat transfer is 550 W (1 watt = 1 joule/second (1 W = 1 J/s))?

? s

Please explain each step thoroughly and why, I am really confused.

Answer #1

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.600 kg aluminum pot containing 2.00 kg of water
from 40.0°C to the boiling point and then boil away 0.850 kg of
water?
kcal
(b)
How long (in s) does this take if the rate of heat transfer is
600 W (1 watt = 1 joule/second (1 W = 1 J/s))?
s

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.550 kg aluminum pot containing 3.50 kg of water
from 25.0°C to the boiling point and then boil away 0.650 kg of
water?
(b)
How long (in s) does this take if the rate of heat transfer is
600 W (1 watt = 1 joule/second (1 W = 1 J/s))?

(a) How much heat transfer is required to raise the temperature
of a 0.750-kg copper pot containing 2.50 kg of water from 30.0ºC to
the boiling point and then boil away 0.750 kg of water?
(b) How long does this take if the rate of heat transfer is 555
W 1 watt = 1 joule/second (1 W = 1 J/s) ? Answer in seconds.

An ice bag containing 0°C ice is much more effective in
absorbing heat than one containing the same amount of 0°C
water.
(a)
How much heat (in J) is required to raise the temperature of
0.800 kg of water from 0°C to 32.0°C?
J
(b)
How much heat (in J) is required to first melt 0.800 kg of 0°C
ice and then raise its temperature?
J
(c)
Explain how your answers support the contention that the ice is
more effective....

How much heat transfer (in kJ) is necessary to raise the
temperature of 0.766 kg of ice from 0ºC to 32.6ºC? The specific
heat of water is 4186 J/kgºC and the heat of fusion for water is
334 kJ/kg.

How much time (in seconds) is needed for a surgical cauterizer
to raise the temperature of 2.00 g of tissue from 37.0°C to 100°C
and then boil away 0.200 g of water, if it puts out 1.50 mA at 20.0
kV? Ignore heat transfer to the surroundings. (Assume the specific
heat of tissue is 3,500 J/(kg · °C) and the latent heat of
vaporization of water is 2,256 kJ/kg.)

(a)
How much heat transfer (in kJ) is necessary to raise the
temperature of a 0.150 kg piece of ice from −18.0°C to 128°C,
including the energy needed for phase changes? (Assume the
substance remains at a constant volume throughout each stage of the
heating process.)
kJ
(b)
How much time (in s) is required for each stage, assuming a
constant 21.5 kJ/s rate of heat transfer? (Enter your answers as a
comma-separated list. Enter your times in order from...

(A) How much heat transfer (in kJ) is necessary to raise the
temperature of a 0.150 kg piece of ice from −16.0°C to 132°C,
including the energy needed for phase changes? (Assume the
substance remains at a constant volume throughout each stage of the
heating process.)
(B) How much time (in s) is required for each stage, assuming a
constant 21.5 kJ/s rate of heat transfer? (Enter your answers as a
comma-separated list. Enter your times in order from the...

(a)
How much heat transfer (in kJ) is necessary to raise the
temperature of a 0.170 kg piece of ice from −18.0°C to 124°C,
including the energy needed for phase changes? (Assume the
substance remains at a constant volume throughout each stage of the
heating process.)
(b)
How much time (in s) is required for each stage, assuming a
constant 20.5 kJ/s rate of heat transfer? (Enter your answers as a
comma-separated list. Enter your times in order from the...

(a)
How much heat transfer (in kJ) is necessary to raise the
temperature of a 0.210 kg piece of ice from −24.0°C to 134°C,
including the energy needed for phase changes? (Assume the
substance remains at a constant volume throughout each stage of the
heating process.)
kJ
(b)
How much time (in s) is required for each stage, assuming a
constant 20.5 kJ/s rate of heat transfer? (Enter your answers as a
comma-separated list. Enter your times in order from...

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