Question

**500g of water at temperature of 15°C is placed in a
freezer. The freezer has a power rating of 100W and is 80%
efficient.**

**1- Calculate the energy required to convert the water
into ice at a temperature of -20°C.**

**2- How much energy is removed every second from the air
in the freezer?**

**3- How long will it take the water to reach a
temperature of -20°C?**

**4- Explain the process that cools the air in the
freezer.**

**5- The freezer causes the room temperature to rise.
Explain why.**

**Specific heat capacity of ice =2100J
kg ^{-1}K^{-1}; Specific heat capacity of
water**

**=4180J kg ^{-1}K^{-1}; Specific latent
heat of fusion of water =
3.3x10^{5}Jkg^{-1}**

Answer #1

Q8
a) Define (i) Specific Heat Capacity, (ii) Specific Latent
Heat.
b) 500g of water at temperature of 15°C is placed in a
freezer. The freezer has a power rating of 100W and is 80%
efficient.
(i) Calculate the energy required to convert the water into
ice at a temperature of -20°C.
(ii) How much energy is removed every second from the air in
the freezer?
(iii) How long will it take the water to reach a temperature
of -20°C?...

1. You need design a freezer that will keep the temperature
inside a -5.0 C and will operate with a temperature inside at 5.0 C
and will operate in a room with a temperature of 22.0 C. The
freezer is to make 20.0 kg of ice at 0.0 C starting with water at
20.0 C. For water, the specific heat is 4190 J/kg-K, the heat of
fusion is 333 kj/kg.
a. How much energy must be removed from the water...

a) A freezer maintains an interior temperature inside of −12.0°C
and has a coefficient of performance of 3.00. The freezer sits in a
room with a temperature of 25.0°C. The freezer is able to
completely convert 28.0 g of liquid water at 25.0°C to ice at
−12.0°C in one minute. What input power (in watts) does the freezer
require? (The specific heat of liquid water is 4.186 J/(g · °C),
the specific heat of ice is 2.090 J/(g · °C),...

19.
(a)
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and has a coefficient of performance of 3.00. The freezer sits in a
room with a temperature of 15.0°C. The freezer is able to
completely convert 28.0 g of liquid water at 15.0°C to ice at
−16.0°C in one minute. What input power (in watts) does the
freezer require? (The specific heat of liquid water is
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A container with 59 g of water at 23oC is placed in a
freezer. How much heat must be removed from the water to turn it to
ice at –9 oC? Ignore the heat capacity of the container.
Give your answer in kilo-joules (kJ) with 3 significant
figures.
Specific heat of ice: 2.090 J/g K
Specific heat of water: 4.186 J/g K
Latent heat of fusion for water: 333 J/g

A cube of ice is taken from the freezer at -6.5 ?C and placed in
a 85-g aluminum calorimeter filled with 300 g of water at room
temperature of 20.0 ?C. The final situation is observed to be all
water at 17.0 ?C. The specific heat of ice is 2100 J/kg?C?, the
specific heat of aluminum is 900 J/kg?C?, the specific heat of
water is is 4186 J/kg?C?, the heat of fusion of water is 333 kJ/Kg.
a)What was the...

A cube of ice is taken from the freezer at -5.5 ∘C and placed in
a 85-g aluminum calorimeter filled with 300 g of water at room
temperature of 20.0 ∘C. The final situation is observed to be all
water at 16.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the
specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of
water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333 kJ/Kg.
What was the...

A cube of ice is taken from the freezer at -8.5 ∘C and placed in
a 85-g aluminum calorimeter filled with 320 g of water at room
temperature of 20.0 ∘C. The final situation is observed to be all
water at 15.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the
specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of
water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333
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A freezer has a coefficient of performance of 2.60. The freezer
is to convert 1.86 kg of water at 26.0 ∘C to 1.86 kg of ice at
-5.00 ∘C in 1 hour.
a) What amount of heat must be removed from the water at 26.0 ∘C
to convert it to ice at -5.00 ∘C ?
b) How much electrical energy is consumed by the freezer during
this hour?
c) How much wasted heat is rejected to the room in which...

Hot tea (water) of mass 0.21 kg and temperature 62 ∘C is
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amount of ice in you need to make ice tea (final temperature of
0∘C)? Give your answer in kg to two decimal places. The specific
heat of...

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