You want to make yourself some green tea, but the indicator on your (electric) kettle that...
You want to make yourself some green tea, but the indicator on your (electric) kettle that lets you know the water has boiled does not work. You would like to put the kettle on and come back when the water has boiled. You know your kettlesupplies energy at a rate of 1025 W (1025 J/s). Assume water boils at 100°C.
a. How long will it take, in seconds, to heat 0.8 kg of water from 15°C to the boiling point?
b. When the water begins to boil, how much additional time would it be before there was a fire risk (assume there is a fire risk when all of the water is boiled)? Hint: first calculate how much energy is required for the changes to take place. Also, you can ignore the signs of your calculations because time is always > 0.
Homework Answers
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You want to make yourself some green tea, but the indicator on
your (electric) kettle that...
An aluminum tea kettle of 0.45-kg containing 2.40-kg of water at 25°C is placed on a...
An aluminum tea kettle of 0.45-kg containing 2.40-kg of water at
25°C is placed on a
burner. Assuming that the burner is rated at 2000 Watt, how long
will it take to bring
the water to a boil? (b) Once boiling begins, how much time is
required to boil all the
water out of the tea kettle? Assume that no energy is lost in this
process.
Latent Heat of Fusion Latent Heat of Vaporization Specific Heats SubstcJkg. C cal/g- CS...
1. Russell Biven decides to make some iced tea. He starts with 6 liters of water...
1.
Russell Biven decides to make some iced tea. He starts with 6
liters of water at 25°C. Assume that the properties (heat
coefficients, density, etc) for iced tea are the same as for
water.
Example 1 Example 2
Part
Description
Answer
Chk
History
A.
Russell starts by bringing the 6 liters of water to a boil. How
much heat is needed to be added to bring the water to a boil?
(include units with answer)
A: 450000cal
C:...
Q3. To make a beef soup base you want to boil 1kg of beef ( assume...
Q3. To make a beef soup base you want to boil 1kg of beef ( assume pure protein) in 5L of water starting at STP (a)How much heat in Joules do you need to apply? (b) You left it boiling and forgot it, all the water boiled out to steam at 100 °C. Ignoring the beef in the calculations, how much additional heat in Joules was used In your calculations ignore the container in which you boil
Hint for Part C: 5. 1792 Russell Biven decides to make some iced tea. He starts...
Hint for Part C:
5. 1792 Russell Biven decides to make some iced tea. He starts with 6 liters of water at 17°C. Assume that the properties (heat coefficients, density, etc) for iced tea are the same as for water. Ignore the pot when making calculations. Example 1 Example 2 MIX NEN NTH H Part Chk History Description Answer Russell starts by bringing the 6 liters of water to a boil. How much heat A: needs to be added to...
Question 10 - M1 (18 marks) Many people use electric kettles in their houses to boil...
Question 10 - M1 (18 marks) Many people use electric kettles in their houses to boil water (for example to make a cup of tea or coffee) These devices work by passing an electric current through a metal wire. As the electricity passes through the wire, it gets hot and this is the source of heat to boil the water. Consider the Kettle shown in the figure below. The electricity passes through a coiled 'resistance wire' which is housed within...
You want to boil 1.9L of water on your 1500W stove burner. Initially, the water is...
You want to boil 1.9L of water on your 1500W stove burner. Initially, the water is at 20C, and it is finished when it reaches a quality of 0.1. What time does it take to boil the water with the lid on? With the lid off? I do NOT want you to use heat capacities. Quality is the mass fraction: vapor/(vapor + liquid).
You want to retire at age 65. You decide to make a deposit to yourself at...
You want to retire at age 65. You decide to make a deposit to yourself at the end of each year into an account paying 2%, compounded annually. Assuming you are now 25 and can spare $1,500 per year, how much will you have when you retire at age 65? (Round your answer to the nearest cent.) 5
You find yourself setting up another Western blot, however. today you are preparing the samples t...
You find yourself setting up another Western blot, however. today you are preparing the samples to load onto the SDS-PAGE gel. You are using a 4-20%SDS-PAGE gel that can hold a maximum of 30 μしper 1 You remember from you so decided to prepare each sample with a final volume of 25 uL. However, no one is perfect at pipetting, so make sure each sample is made at 1.5X the total volume needed per well. The protein you are interested...
AL AIN MANUFACTURING COMPANY- AAC For 6 years, Al Ain Company (AAC) only produced one product:...
AL AIN MANUFACTURING COMPANY- AAC For 6 years, Al Ain Company (AAC) only produced one product: the basic electric kettle for boiling water. The kettle was the first on the market to have a reliability system enabling it to turn itself off at the exact moment when the water had boiled. It is also light enough to be carried easily, looked modern and was quite robust. From a manufacturing point of view, the kettle consisted of pressed stainless steel body...
Suppose it is a particularly hot summer day and you want to make some popsicles to...
Suppose it is a particularly hot summer day and you want to make some popsicles to help cool off. You fill a popsicle mold with 0.15kg of juice (suppose it is the same thermal energy as water). The juice starts out at a temperature of 30 °C and the freezer will cool it to -20 °C. a. How much heat must be removed from the popsicles in order to bring them to their final temperature. b. Draw an energy flow diagram...
An aluminum tea kettle of 0.45-kg containing 2.40-kg of water at
25°C is placed on a
burner. Assuming that the burner is rated at 2000 Watt, how long
will it take to bring
the water to a boil? (b) Once boiling begins, how much time is
required to boil all the
water out of the tea kettle? Assume that no energy is lost in this
process.
Latent Heat of Fusion Latent Heat of Vaporization Specific Heats SubstcJkg. C cal/g- CS...
Q3. To make a beef soup base you want to boil 1kg of beef ( assume pure protein) in 5L of water starting at STP (a)How much heat in Joules do you need to apply? (b) You left it boiling and forgot it, all the water boiled out to steam at 100 °C. Ignoring the beef in the calculations, how much additional heat in Joules was used In your calculations ignore the container in which you boil
Hint for Part C:
5. 1792 Russell Biven decides to make some iced tea. He starts with 6 liters of water at 17°C. Assume that the properties (heat coefficients, density, etc) for iced tea are the same as for water. Ignore the pot when making calculations. Example 1 Example 2 MIX NEN NTH H Part Chk History Description Answer Russell starts by bringing the 6 liters of water to a boil. How much heat A: needs to be added to...
Question 10 - M1 (18 marks) Many people use electric kettles in their houses to boil water (for example to make a cup of tea or coffee) These devices work by passing an electric current through a metal wire. As the electricity passes through the wire, it gets hot and this is the source of heat to boil the water. Consider the Kettle shown in the figure below. The electricity passes through a coiled 'resistance wire' which is housed within...
You want to retire at age 65. You decide to make a deposit to yourself at the end of each year into an account paying 2%, compounded annually. Assuming you are now 25 and can spare $1,500 per year, how much will you have when you retire at age 65? (Round your answer to the nearest cent.) 5
You find yourself setting up another Western blot, however. today you are preparing the samples to load onto the SDS-PAGE gel. You are using a 4-20%SDS-PAGE gel that can hold a maximum of 30 μしper 1 You remember from you so decided to prepare each sample with a final volume of 25 uL. However, no one is perfect at pipetting, so make sure each sample is made at 1.5X the total volume needed per well. The protein you are interested...
AL AIN MANUFACTURING COMPANY- AAC For 6 years, Al Ain Company (AAC) only produced one product: the basic electric kettle for boiling water. The kettle was the first on the market to have a reliability system enabling it to turn itself off at the exact moment when the water had boiled. It is also light enough to be carried easily, looked modern and was quite robust. From a manufacturing point of view, the kettle consisted of pressed stainless steel body...
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