The efficiency of a heat engine, which consumes 330 j from a heated reservoir and expels 308 j of energy every cycle, is 6.66%.
A closed-cycle device called a heat engine uses heat from a hot reservoir to do beneficial work before rejecting the leftover heat to a cool reservoir.A cylindrical thermal conductor links a hot reservoir at 50 °C with a cold reservoir at -60 °C.
(a) Using formula of efficiency as:
e= W en8/∣Q h ∣ = 22.0J/330J =0.0666 or 6.66%
(b) Energy expelled to the cold reservoir in each cycle:
∣Q e ∣=∣Q h ∣−W eng =330J−22.0J=308J
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complete question:
A heat engine takes in 330 J of energy from a hot reservoir and performs 22.0 J of work in each cycle. Find (a) the efficiency of the engine and (b) the energy expelled to the cold reservoir in each cycle.
Drops of a clear liquid are added to a red liquid. As the drops are added, the red liquid
becomes orange, then yellow. Which of the following is an indicator that a chemical
reaction occurred?
A. Formation of a precipitate
B. Emission of light
C. Color Change
D. Gas formation
Answer:
B. Color change
3&5
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In an attempt to study the variation of the boiling point of mixture (B + C), the teacher immerses a thermometer probe into the mixture inside the test tube. Then, she connects the probe to the computer interface and starts collecting temperature data during the boiling phase. After 10 minutes, a graph is obtained. To which physical state will the above mixture change after boiling? Which of the above graphs do you expect to obtain? why?
Answer:
The mixture (B + C) will change from liquid to gases.
This is because at constant temperature, the mixture will evaporate.
Graph 1 is expected to be assigned for the mixture (B + C)
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Which of the following can be natural sources of water pollution a volcanic activity be earthquake see algae blooms de all of the above please of the best answer from the choices provided
Answer:
The correct answer is algae bloom
Explanation:
Algae bloom is a situation in which there is an uncontrollable increase in the amount/growth of algae in a water body (freshwater or marine water). This abnormal increase eventually gives the water body a different colour which is from the pigment of the algae. The processes involved in algae bloom leads to lowered oxygen levels in the water-body which causes the death of several aquatic organisms in the water-body. Since water pollution can be described as the processes involved in causing adverse effects that can contaminate a water-body which can lead to loss of aquatic animals and/or affect the physical properties of the water, algae bloom (as described earlier) is the correct option.
NOTE: volcanic activities and earthquakes may cause air pollution as they release several substances into the air but can hardly be directly linked to water pollution.
Answer:
d) all of the aboved
Explanation:
EDG2020
Write 1/5 as an equivalent fraction with 500 in the denominator?
I need help please
Answer:
100 / 500
Explanation:
100 / 500 is equivalent to 1 / 5.
Rank these systems in order of decreasing entropy. Rank from highest to lowest entropy.
a. 1 mol carbon tetrafluoride gas at 273k 40L
b. 1 mol krypton gas at 273K 40L
c. 1/2 mol krypton gas at 100k 20L
d. 1 mol krypton gas at 273K 20L
e. 1/2 mol krypton liquid at 100K
f. 1 mol fluorine gas 273 K 40L
g. 1/2 mol krypton gas at 273K 20L
Answer:
The answer is "order will be A > F > B> D > G > C > E".
Explanation:
Entropy is disunity, the greater the lack of organization the entropy. When two gases use the same moles, then more entropy is achieved for a larger number of atoms in the molecule (even with more macrostates). Its smaller your volume the less the molecules may circulate, reducing as well as the amount of potential different countries and thus the entropy. Molecules or atoms in colder gas are much less active so they do not actually take so many various energy states and therefore less entropy. In colder gas. A liquid is requested more so than gas and its randomness decreases.How does atmospheric pressure affect weather?
Answer:
Because of pressure
Explanation:
What wavelength (in nm) of light is emitted when an electron transitions from the n= 12 to the n = 4 state?Use A£= -2.179x10^-18. And 2.998x10^8
ANSWER
STEP-BY-STEP EXPLANATION
50.0 grams of a pure gaseous compound was
found to contain 30 grams of poxygen. What
is the percentage by weight of oxygen in this
compound?
Answer in units of %.
Answer:
To find the percentage by weight of oxygen in the gaseous compound, we need to first find the weight of the compound that is not oxygen. We can do this by subtracting the weight of the oxygen from the total weight of the compound: 50.0 grams - 30.0 grams = 20.0 grams.
Next, we need to divide the weight of the oxygen by the total weight of the compound and multiply the result by 100% to express the answer as a percentage: 30.0 grams / 50.0 grams * 100% = 60.0%.
Therefore, the percentage by weight of oxygen in the gaseous compound is 60.0%.
Explanation:
solid magnesium aqueous hydrochloric acid aqueous magnesium chloride hydrogen gas balanced equation
Answer:
Mg (s) + 2 HCl (aq) → MgCl 2 (aq) + H 2 (g)
Explanation:
The weather balloon is inflated to a volume of 605dm3 at STP. The balloon is heated to 35 degree Celsius. What would be its volume at 75 cmHg?
The volume of the weather balloon at 75 cmHg is (n₁ * R * T₂) / P₂ = (n₁ * 0.0821 L·atm/(mol·K) * 308.15 K) / 0.9868 atm.
The volume of the weather balloon at 75 cmHg when it is heated to 35 degrees Celsius, we can use the ideal gas law, which states that the product of pressure (P) and volume (V) of a gas is proportional to the product of the number of moles (n) and the temperature (T) in Kelvin.
PV = nRT
Where R is the ideal gas constant.
First, let's convert the initial volume from dm³ to liters:
Initial volume = 605 dm³ = 605 L
At STP (Standard Temperature and Pressure), the temperature is 273.15 K and the pressure is 1 atmosphere (atm).
Using the initial conditions:
P₁ = 1 atm
V₁ = 605 L
T₁ = 273.15 K
We can calculate the number of moles (n₁) of gas using the ideal gas law:
n₁ = (P₁ * V₁) / (R * T₁)
Now, we need to find the final volume (V₂) at 75 cmHg and 35 degrees Celsius.
Converting 75 cmHg to atmospheres:
P₂ = 75 cmHg * (1 atm / 76 cmHg) ≈ 0.9868 atm
so,
P2 = 75 cmHg / 76 cmHg/atm = 0.9868 atm.
Now we can substitute the values into the equation and calculate V2:
V2 = (1 atm / 0.9868 atm) * (T2 / 308.15 K) * (605 liters).
Please provide the new temperature (T2) in Celsius, and I will calculate the volume for you.\((n₁ * R * T₂) / P₂ = (n₁ * 0.0821 L·atm/(mol·K) * 308.15 K) / 0.9868 atm\)
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What is the Possible Energy Collected in kJ if the power striking an oven 53.2 cm by 44.5 cm is 1247.3
watt/meters squared over 67.2 minutes?
Therefore, 118.93 kJ is about the maximum amount of Possible Energy that might be stored.
What is an illustration of potential energy?Gravitational energy, mechanical energy, electrical energy, sound energy, chemical energy, nuclear or atomic energy, light energy, heat energy, and other types of energy are a few examples of these energies. Every form has the capacity to change or transmute into every other form.
We can use the following formula to determine the potential energy stored in kJ:
Energy = Power x Area x Time
We must first convert the oven's surface area to square metres:
Area = (53.2 cm) x (44.5 cm) = 2365.4 cm²
Area = 0.23654 m²
Next, we may enter the values into the formula as follows:
Energy = (1247.3 watt/m²) x (0.23654 m²) x (67.2 minutes x 60 seconds/minute)
Energy = 1247.3 x 0.23654 x 4032
Energy = 118929.5 joules
Finally, we can convert joules to kilojoules:
Energy = 118929.5 joules ÷ 1000
Energy = 118.93 kJ
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Calculate the volume occupied by the oxygen gas at a pressure of 210 kPa and temperature of 50°C. Use your answer from question 27 to help you solve this problem. Report your answer in liters with 3 significant figures._______L
Answer:
holaholaholaholaholaholaholahola
The volume occupied by the oxygen gas at a pressure of 210 kPa and a temperature of 50°C is 0.126 liters, rounded to three significant figures.
To calculate the volume occupied by the oxygen gas at a pressure of 210 kPa and a temperature of 50°C, we can use the ideal gas law equation:
PV = nRT
where:
P = pressure
V = volume
n = number of moles
R = ideal gas constant
T = temperature
First, we need to convert the given temperature from Celsius to Kelvin by adding 273.15:
T = 50°C + 273.15 = 323.15 K
Next, we rearrange the ideal gas law equation to solve for volume:
V = (nRT) / P
To find the number of moles (n), we can use the answer from question 27, which is the mass of oxygen gas:
m = 32 g
Using the molar mass of oxygen (O₂) which is approximately 32 g/mol, we can calculate the number of moles:
n = m / M = 32 g / 32 g/mol = 1 mol
Now we have all the values needed to calculate the volume:
V = (1 mol * 8.314 J/(mol*K) * 323.15 K) / 210,000 Pa
Using the ideal gas constant (R) of 8.314 J/(mol*K) and the pressure of 210 kPa (which is equivalent to 210,000 Pa), we can substitute these values into the equation and solve for volume.
V = 0.126 liters.
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3)
Which fossil would you be most likely to find in a coal mine?
A)
dinosaur
B)
fem
human
D)
whale
Answer:
A
Explanation:
I think it is A because a dinosaurs are extinct so it wold be possible to find a dinosaur fossil in the coal mine.
which stament best explain why the dog is able to see the object more the rabbit can
Answer:
The position of their eyes
Explanation:
See, the dog is able to see the object more than the rabbit can is because of the position of their eyes.
The dogs eyes are positioned in the front like our eyes making the dog have a stereoscopic vision (180 degree field of view)
With rabbits though, they can't really see what's in front of them because their eyes are on the side hence the dog can see the object more than the rabbit can.
How does the air temperature at the bottom of a mountain compare with the air temperature at the top of the mountain?
A. The air is colder at the bottom.
B. The air is warmer at the top.
C. The air temperature at the top is lower.
D. The air temperature is the same.
Explanation: C) the air temp. at the top is lower
As part of an investigation of the population of foxes on Sunday Gill island a scientist graphed the number of foxes presented on the island over a Spam of 15 years as shown below the study began with the earlier 0 and run until the start of year 15 According to the graph during the witch year the event reduced the carrying capacity of the area
The carrying capacity of the area was reduced in the year 10 according to the graph that shows the number of foxes on the island over a span of 15 years.
The graph shows a population of foxes over a span of 15 years. The y-axis represents the number of foxes on the island, while the x-axis represents time. The study began with the earlier 0 and ran until the start of year 15. According to the graph, the carrying capacity of the area was reduced in the year 10.
In the graph, it is shown that the population of foxes on Sunday Gill island had a significant increase from year 0 to year 3. After year 3, the fox population started to decrease and then remained fairly constant until year 10. After year 10, the population of foxes on the island started to decline more rapidly until the end of the study in year 15
This decline in the population of foxes on the island is most likely due to the reduction in carrying capacity of the area. Carrying capacity refers to the maximum number of individuals that an environment can sustain. When the carrying capacity of an environment is reached, it means that the environment can no longer provide the necessary resources to sustain the population.
There are various factors that can cause a reduction in carrying capacity, such as environmental degradation, competition for resources, or a natural disaster. In this case, it is not clear what caused the reduction in carrying capacity in year 10, but it is likely that it was due to some environmental factor that impacted the availability of resources for the fox population.
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in two or more sentences, describe two types of data that can be obtained from descriptive statistics that you learned about in your project. in your description explain how the data is calculated
Two types of data that can be obtained from descriptive statistics include frequency distribution and variability in the data set. These data are calculated as the mean of standard deviation in the case of variation.
What is the relative importance of the science field of descriptive statistics?The relative importance of the science field of descriptive statistics is based on the obtention of statistically significant measurements in order to validate a hypothesis.
Therefore, with this data, we can see that the relative importance of the science field of descriptive statistics is based on testing working hypotheses.
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The "Ring of Responsibility" requires a next to water bodies. O 50-foot 43 3-foot O 5-foot O 15- to 25-foot untreated buffer zone
The "Ring of Responsibility" requires a 15- to 25-foot untreated buffer zone next to water bodies.
What is buffer zone?A buffer zone is an area of land that separates two or more countries, states, or territories, and is often demilitarized. The purpose of a buffer zone is to provide a space for negotiations and to reduce the possibility of conflict and war. Buffer zones can also be used to protect sensitive natural resources or habitats, such as areas of wilderness or wildlife. Buffer zones can be permanent or temporary, and can range in size from a few miles to hundreds of miles. In addition to physical barriers, buffer zones can also include economic, political, and social measures to reduce tensions between two or more parties. Buffer zones are an important tool in international relations, as they can help to prevent armed conflict and promote peaceful resolution of disputes.
This buffer zone is intended to prevent pollutants from entering the water body and protect it from potential environmental damage.
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Can someone please help me with these questions!!!!!!
Answer:
1. A. 10°C
2. A. Boiling point
3. A. Less than liquids.
Explanation:
15 POINTS!!!!! NEED ASAP!!!
1. Describe the differences between scale and proportion in relation to a scientific model.
2. In your own words, describe why scientific models are useful, even though much of the time their scale or proportions are not accurate when compared to the real thing.
3. Describe how atoms can be mostly empty space, even though they are the building blocks of everything in the universe. (i.e. how can your desk be made of atoms which are mostly empty space if it is solid?)
4. We learned about three different types of graphs. Describe each type of graph briefly, including what data goes where, then input a picture example of each type of graph.
Line Graph
Bar Graph
Circle Graph
Scale is the 'size of one object and proportion refers to the size of the parts of an object, scientific models help you visualize, atoms do not contain any empty space, they are filled completely with spread-out electrons, circle graph shows percentages and line graphs show data over time'
1. Scale and proportion are both design elements that have to do with size scale is the size of one object in relation to the other objects in a design or artwork and proportion refers to the size of the parts of an object in relationship to other parts of the same object.
2. Scientific models are useful models can help you visualize, or picture in your mind, something that is difficult to see or understand and models can help scientists communicate their ideas and also understand processes and make predictions that's why time their scale or proportions are not accurate when compared to the real thing.
3. Atoms do not contain any empty space and they are filled completely with spread-out electrons, making the shrinking of atoms impossible that's why it is said that the building blocks of everything in the universe.
4.Circle graph shows percentages and line graphs show data over time and bar graphs are for comparing data collected by counting and line graph is graph that uses lines to connect individual data point this three are graph are important
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I need assistance for number 5 and all parts of problem number five thank you !
Answer
The type of structural formula for each of the hydrocarbons given are shown below:
(a) Propyne (expanded):
(b) 2,2-dimethybutane (skeletal):
(c) Benzene (line-and-angle)
:
(d) Heptane (condensed)
CH₃CH₂CH₂CH₂CH₂CH₂CH₃
the electronegativity of the halogens changes down group 7.Explain how electronegativity changes down group 7. (3 marks)
STEP-BY-STEP EXPLANATION:
Firstly, we need to define electronegativity
Electronegativity is defined as the tendency of an atom in a covalent bond to attract the bonding electrons.
The electronegativity of the halogen decreases down the group due to an increase in the radius of the atom resulting in the addition of outermost shells to the shell of the atom. As the number of shells increases, the force attraction between the nucleus and the electron moving around the shell decreases.
What is the predominant form of ethylenediamine at pH 6.184 ?
H2NCH2CH2NH+3
H2NCH2CH2NH2
H+3NCH2CH2NH+3
The predominant form of ethylenediamine at pH 6.184 is H2NCH2CH2NH+3.
At pH 6.184, which is slightly acidic, the amino groups in ethylenediamine (H2NCH2CH2NH2) can partially protonate, resulting in the formation of ammonium ions (H+3NCH2CH2NH+3). The equilibrium between the neutral form and the protonated form is pH-dependent.
Therefore, at pH 6.184, the predominant form of ethylenediamine is H2NCH2CH2NH+3.
2 ml of silver nitrate piece of copper metal 2 ml of lead(ii) nitrate piece of zinc metal (sit for 10 minutes) 1 ml of potassium iodide
The lead(II) nitrate solution has a molarity of 1.2M if 22.00 mL of 2.00 M potassium iodide is required to equilibrate with 18.00 mL of lead(II) nitrate.
The following formula can be used to determine a solution's molarity:
na/nb = CaVa/CbVb
Where;
Ca is the acid concentration.
Cb = base concentration
Va = acid volume
Vb = base volume
na = number of acid moles
nb = number of base moles
The reaction's balanced equation is as follows:
2KNO3 (aq) + PbI2 Pb(NO3)2 (aq) + 2KI (s)
22 × 2/18 × Cb = 2/1
44/18Cb = 2
Cb = 44 ÷ 36
Cb = 1.2M
Since 22.00 mL of 2.00 M potassium iodide is required to equilibrate with 18.00 mL of lead (II) nitrate, the lead(II) nitrate solution's molarity is 1.2M.
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If you have six molecules of CO2how many oxygen atoms do you have?
Why do leavening gases expand faster at higher altitudes
Answer:
Cakes, breads and other foods that contain leavening agents rise more quickly at higher altitudes, because gases produced by the agents expand faster than at sea level. The loaves may collapse if the gases dissipate before the proper temperature is reached. Most baking recipes can be adjusted for high altitudes.
Explanation:
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identify the answer choice that lists 62co, 64ni, 61cu, and 64zn in order of increasing number of neutrons
62Co, 61Cu, 64Ni, 64Zn . the answer choice that lists 62co, 64ni, 61cu, and 64zn in order of increasing number of neutrons The number of neutrons equals.
neutrons the difference between the atomic mass number (M) and the atomic number (Z). Copper has an atomic mass of 63.5 and an atomic number of 29. - The atomic number of a neutral element is always equal to the amount of electrons or protons present. As a result, the copper atom has 34 neutrons.Cu-61 < Zn-64 < Co-62 < Ni-64. the answer choice that lists 62co, 64ni, 61cu, and 64zn in order of increasing number of neutrons The number of neutrons equals. Copper exists in nature primarily as two isotopes: 6329Cu and 6529Cu. An atom's atomic number is equal to the number of protons in its nucleus or the number of electrons in an electrically neutral atom. A sodium atom, for example, contains 11 electrons and 11 protons. As a result, the atomic number of the Na atom Equals number.
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This group of fungi forms spores in a round structure on the end of a hyphae
Answer:
Is zygote fungi an option??
Answer:
zygote fungi
Explanation:
i got the answer right
The volume of a balloon filled with NH₃ at 15.0 psi is compressed from 2.60 L to 1.30 L at a constant temperature. What is the final pressure (in atm) of the the balloon?
Answer is: ? atm
Answer:
30 psi
Explanation:
P₁V₁ = P₂V₂
(15psi) (2.6L) = P₂(1.30L)
Solve for P₂
(15psi) (2.6L)
------------------ = P₂ = 30 psi
(1.30L)
According to the Boyle's law , the final pressure ( in atm) of the balloon is 2.041 atmospheres.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
In the given problem, the final pressure of gas can be found out as,
P₁V₁=P₂V₂
substituting the given values ,
P₂=15×2.6/1.30=30 psi
As 1 psi =0.068 atmospheres
∴30 psi=2.041 atmospheres
Therefore, the final volume of gas in balloon in atmospheres is 2.041 atmospheres.
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Give IUPAC names for the following compounds:
Answer:
Explanation:
IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring. All deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities