The two changes of state of the refrigerant are necessary to operate a refrigerator because liquid refrigerant must evaporate and cool.
What is refrigerator?A refrigerator is a heat engine in which work is done on a refrigerant substance in order to collect energy from a cold region and exhaust it in a higher temperature region, thereby further cooling the cold region.
What is liquid refrigerant?The liquid refrigerant is used for heat transfer in a refrigeration system, which absorbs heat at a low temperature and low pressure and rejects heat at a higher temperature and a higher pressure.
Explain refrigeration cycle?This cycle is based on the process of changing the physical state of the liquid refrigerant (from liquid to gas and vice versa). These substances condense to liquid at high pressures and evaporate to gases) at low pressures. The cold in cooling systems happens due to the change of state of this liquid refrigerant fluid to gas.This process depends on the work done by the compressor – which uses mechanical energy to compress the liquid refrigerant from the evaporator in the gas phase.With this compression, the pressure and temperature of the liquid refrigerant increases. When it enters the condenser, the refrigerant transfer the heat to the environment, causing its temperature to decrease and condensation occurs, which is the process of phase change from gas to liquid.After that, the liquid refrigerant passes through the control element – capillary tube or expansion valve – which, by narrowing the passage, slows its speed on the evaporator, causing its pressure to decrease. The liquid refrigerant arrives on the liquid state and under low pressure to the evaporator, during which it is changing phase again, from liquid to gas. When you change phase, it absorbs the heat present in the conditioned items in the refrigerator case and returns to the compressor, restarting the refrigeration cycle.The liquid refrigerant must evaporate (change from a liquid to a gas) and cool. This process releases heat. The cool gas is pumped through tubes so that it can absorb heat from the interior of the refrigerator, keeping it away from the food. Then the gas must condense into a liquid so that it can release the absorbed heat to the outside and begin the cycle again.
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How does gravity keep the planets in orbit around the sun
The BEST example of diffraction is the image of
Question 8 options:
a ring around the Sun caused by particles in the air.
a pencil that appears broken in a glass of water.
a fingerprint that appears to be enlarged under a magnifying glass.
your image in a mirror
If I add 475mL of water to 75.0mL of a 0.315M NaOH solution, what will the molarity of the diluted solution be?
what model is used to show the pattern of traits that are passed from one generation to the next in family
How many moles of propane (C3H8) are in a 7.00-L tank at 20.0°C and 5.45 atm of pressure?
the amount of propane in the tank at the given temperature and pressure is 1.59moles.
Given the data in the question;
Volume of tank; [tex]V = 7.00L[/tex]Temperature; [tex]T = 20.0^oC = 293.15K[/tex]Pressure; [tex]P = 5.45atm[/tex]Amount of propane; [tex]n = \ ?[/tex]Ideal Gas LawThe Ideal gas law states "that pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature. It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( [tex]R = 0.08206Latm/molK[/tex] ).
The determine the amount of propane in the tank, we substitute our given values into the equation above.
[tex]PV = nRT\\\\5.45atm * 7.00L = n * 0.08206Latm/molK * 293.15K\\\\38.15Latm = n * 24.055889Latm/mol\\\\n = \frac{38.15Latm}{24.055889Latm/mol}\\ \\n = 1.59moles[/tex]
Therefore, the amount of propane in the tank at the given temperature and pressure is 1.59moles.
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which is a scientific claim? At least 75 percent of the class will pass the physical science test today because they studied more than two hours for it. According to the star of the number-one teen TV show, crushed rosemary and olive oil spread over pimples will draw out the bacteria and prevent scarring. Plants fertilized once per week with Super Plant Food Formula have been shown in testing to produce twice as much fruit as plants that are not. Placing half-filled one-gallon jugs of water out on the lawn prevents moles from occupying the space underground.
what statement best descrubes sulfuric acid (H2SO4).
A. sulfuric acid is a compound.
B. sulfuric acid is a mixture.
C. sulfuric acid is an element.
D. sulfuric acid is a suspension.
all force produces motion
Table salt is the compound sodium chloride (NaCl). Use the periodic table to find the molar mass of NaCl
the answer to this question is 58.44
What is the chemical formula of this organic compound
How does gravity affect Earth and other objects found in the solar system? choose all that apply
Moons' orbits around planets
Planets' order (from Sun)
Annual amounts of snow on Earth
Pushing and pulling of tides on Earth
Colors of living things
What effect does an ocean have on the climate
How much heat is required to change the temperature of a 15 g aluminum can with 100 g of water from 24.5°C to 55°C?
The number of seats in the first 12 rows of a high school auditorium form an arithmetic sequence the first row has 9 seats the second row has 11 seats.
a) write a recursive formula to represent the sequence
b) write an explicit formula to represent the sequence.
c) how many seats are in the 12th row.
plz help me ASAP it's a math question not chemistry
There are 31 seats in the 12th row.
a) The first question is to obtain the recursive formula so we will have;
S1 = 9
S(n) = S (n-1) +2
b) To obtain the explicit formula of the arithmetic progression
Where;
a= first term
d =common difference
It then follows that the n th term is given by a + (n-1) d
So;
a = 9, and
d= 2
For n th row = 9+ 2(n-1)
c)the number of seats in 12 th row can be obtained by;
9 + 2(12-1)
= 9 + 2(11)
= 31 seats
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At 685 mmHg pressure and 50°C, a gas has a volume of 5.35 L. If the volume of the container decreases to 1.25 L, what is the amount of the pressure change?
Answer:
The amount of the pressure change is 2,246.8 mmHg.
Explanation:
In order to determine change in pressure we have to find the pressure of the gas when it occupied 1.25 L of volume.
So,to calculate the new pressure, we use the equation given by Boyle's law.
This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
[tex]P_1V_1=P_2V_2[/tex] (at constant temperature)
where,
[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.
[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.
We are given:
[tex]P_1=685 mmHg\\V_1=5.35 L\\P_2=?\\V_2=1.25 L[/tex]
Putting values in above equation, we get:
[tex]685 mmHg\times 5.35 L=P_2\times 1.25 L[/tex]
[tex]P_2=\frac{685 mmHg\times 5.35 L}{1.25 L}=2931.8 mmHg[/tex]
The amount of the pressure change = [tex]P_2-P_1[/tex]
[tex]P_1-P_2=2931.8 mmHg-685 mmHg=2,246.8 mmHg[/tex]
The Doppler effect is used in:
Producing energy and predicting floods
Locating missing cell phones and growing plants
Identifying areas of rain and identifying speeding cars
Curing some illnesses and observing subatomic particles
Rainwater will enter the ground at x if the ground is a) saturated and permeable
B) saturated and impermeable
C) unsaturated and permeable
D) unsaturated and impermeable
Final answer:
Rainwater enters the ground effectively when the soil is unsaturated and permeable, allowing the infiltration and percolation process to replenish groundwater sources.
Explanation:
The question 'Rainwater will enter the ground at x if the ground is a) saturated and permeable b) saturated and impermeable c) unsaturated and permeable d) unsaturated and impermeable' pertains to the concepts of groundwater recharge, infiltration, and the nature of soil permeability. Rainwater enters the ground through a process known as infiltration, which is significantly influenced by the soil's saturation level and its permeability. In this context, option C: unsaturated and permeable is the correct answer. This is because unsaturated soil indicates that there is room for more water in the soil's pore space, and permeability means the soil has pathways through which rainwater can move. When soil is unsaturated and permeable, it allows for effective infiltration and percolation of rainwater into deeper layers, eventually replenishing groundwater sources.
Which of the following correctly orders the layers of the atmosphere from lowest to highest?
A. troposphere, stratosphere, mesosphere, ionosphere
B. ionosphere, stratosphere, mesosphere, troposphere
C. thermosphere, stratosphere, mesosphere, troposphere
D.stratosphere, troposphere, mesosphere, thermosphere
The equation 24x2+25x−47ax−2=−8x−3−53ax−2 is true for all values of x≠2a, where a is a constant.
What is the value of a?
A) -16
B) -3
C) 3
D) 16
Which kind of diagram shows changes in the three kinds of rocks over time? A. rock cycle B. stratification process C. crystallization rate D. temperature change
Answer:
A. rock cycle
Explanation:
Rock cycle shows the changes in the three kinds of rocks over time.
The rock cycle refers to the description of the geological processes that rocks go through to become igneous, sedimentary and metamorphic.
The cycle shows the time it takes for the different types of rocks to form and how this change is related to the water cycle and the way the tectonic plates move.
The rock cycle begins with the formation of igneous rock as the first stage.Igneous rocks can form when magma penetrates through cracks in existing rocks or by cooling lava from volcanic eruptions.
The formation of sedimentary rock as a second stage.Sedimentary rocks are formed by the consolidation of sediments that come from erosion.
That is, igneous rocks undergo different processes such as erosion, transport and weathering, which causes the rock to transform into small particles (sediments).
Over time, they are transformed due to the weight of the successive layers deposited and the action of water, forming rocks by a process called lithification.
The formation of metamorphic rock as a third stage.The metamorphic rocks suppose the alteration in solid state of rocks that are already consolidated in the earth's crust.
That is, sedimentary rocks are affected by the movement of the earth's crust related to the movement of tectonic plates and the formation of mountains.
Therefore, we can conclude that rock cycle shows the changes in the three kinds of rocks over time.
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hen car tires are on hot pavement for too long, the pressure inside will ___________ and the volume within the tire will _____________.
PLEASE HELP!!
As a 15.1-gram sample of a metal absorbs 48.75 J of heat, its temperature increases 25.0K. What is the specific heat capacity of the metal?
A) 0.129 J/gK B) 1.95 J/gK C) 3.23 J/gK D) 7.74 J/gK
As a 15.1-gram sample of a metal absorbs 48.75 J of heat, its temperature increases 25.0K. [tex]0.129 \frac{\mathrm{J}}{\mathrm{g} \mathrm{K}}[/tex] is the specific heat capacity of the metal
Answer: Option A
Explanation:
Specific heat term explains the amount of heat needs to be added with unit mass in order to increase the temperature by a degree Celsius. Its formula is given by,
[tex]Q=m \times c \times \Delta T[/tex]
Where,
[tex]\Delta T=\text { final } T-\text {initial} T=25.0 \mathrm{K}[/tex]
[tex]Q \text { is the heat energy in Joules }=48.75 \text { Joules }[/tex]
[tex]c \text { is the specific heat capacity }[/tex]
[tex]m \text { is the mass of the metal }[/tex]
Plugging in the values
[tex]c=\frac{Q}{m \times \Delta T}=\frac{48.75 \mathrm{J}}{15.1 \mathrm{g} \times 25.0 \mathrm{K}}=\frac{48.75 \mathrm{J}}{377.5 \mathrm{g} \mathrm{K}}=0.129 \frac{\mathrm{J}}{\mathrm{g} \mathrm{K}}(\text { Answer })[/tex]
Terrlel uses a microscope to look t slides of plant cells. he sees a cell with two nuclei that have visible chromosomes. which stage of cell division is this cell?
Which of the following use of chemicals is correct? URGENT QUESTION
A. Window cleaner is used to clean a food contact surface
B. Chemicals are used at double the recommended strength for dificult to clean items.
C. Concentrated degreaser is stored in a chemical storage cabinet.
D. A spray bottle used to water plants is unlabeled.
The correct use of chemicals from the options provided is that a concentrated degreaser needs to be stored in a chemical storage cabinet. This is to ensure safety and prevent contamination or accidents. The correct option is C.
The correct use of chemicals, particularly in settings where food is handled, is crucial for health and safety. Among the options provided:
Window cleaner is not suitable for use on food contact surfaces due to its chemical composition, which may not be food safe.Using chemicals at double the recommended strength can be dangerous and is not advisable as it may lead to harmful residues or reactions.Concentrated degreaser should indeed be stored in a chemical storage cabinet to prevent accidents and contamination.An unlabeled spray bottle, especially one used to water plants, represents a risk as it may lead to confusion and misuse.Therefore, the correct use of chemicals is represented by option C: Concentrated degreaser is stored in a chemical storage cabinet. This practice ensures that hazardous substances are kept in a safe location and reduces the risk of accidental injury or contamination.
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For the balanced equation shown below, how many moles of O2 will react with 0.3020 moles of CO2?
2C2 H5 OH + 6O2 → 4CO2 + 6H2O
Question options:
0.151 moles O2
0.201 moles O2
0.302 moles O2
0.453 moles O2
what is the part of a solution that dissolves called
what are two physical changes that could occur with a piece of paper?
Helpz mez plzz pwzzzzz
The 2004 Indian Ocean tsunami was caused by a major earthquake that originated below the earthquake epicenter, which is the point on the ocean's surface directly above the earthquake focus. The dashed lines on the map indicate the path of the tsunami's waves.
The correct answer is option C.
On December 26, 2004, a major earthquake occurred in the Indian Ocean, triggering a tsunami that resulted in the loss of thousands of lives. The earthquake originated below the earthquake epicenter, which is the point on the ocean's surface directly above the earthquake focus. The dashed lines on the map indicate the path of the tsunami's waves.
The earthquake epicenter is important because it is the point on the ocean's surface where the tsunami waves are generated. The waves radiate outward from the epicenter in all directions, with the largest waves occurring closest to the epicenter. The waves then travel across the ocean, decreasing in height as they move away from the epicenter.
The 2004 Indian Ocean tsunami was one of the deadliest tsunamis in recorded history, with an estimated 230,000 people killed. The tsunami waves reached heights of up to 30 meters (100 feet) in some areas, and caused widespread damage to coastal communities.
The 2004 tsunami was a reminder of the destructive power of tsunamis. It is important to be aware of the risks associated with tsunamis and to know what to do if a tsunami warning is issued.
Therefore, from the given options the correct one is C.
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Plants perform photosynthesis and respiration. Dead plants are broken down and become part of the soil. Which of the following matter do plants help to cycle through ecosystems? Select one:
a. carbon only
b. carbon, oxygen, and nitrogen only
c. carbon and oxygen only d. carbon, oxygen, nitrogen, and water
Final answer:
The correct answer is "carbon, oxygen, nitrogen, and water". Plants are essential in cycling carbon, oxygen, nitrogen, and water through ecosystems via processes like photosynthesis, respiration, transpiration, and interactions with nitrogen-fixing bacteria.
Explanation:
Plants play a crucial role in cycling matter through ecosystems by participating in several biogeochemical cycles. During the photosynthesis process, they absorb carbon dioxide from the atmosphere and release oxygen, which is essential for the survival of most living organisms. Meanwhile, respiration in plants, animals, and decomposers returns carbon dioxide to the atmosphere. Plants are also involved in the water cycle through transpiration, and in the nitrogen cycle, through nitrogen-fixing bacteria that reside in the roots of certain plants like legumes. Therefore, plants help to cycle carbon, oxygen, nitrogen, and water through ecosystems.
What needs to be added to liquid water at the Earth's surface in order to evaporate it into gaseous water
Answer: Yes heat is correct.
Explanation: