The maximum possible efficiency of the heat engine that uses reservoirs at 800°C and 0°C is 74%.
Maximum efficiency is mainly calculated for heat engines.
Let the starting temperature be T1 and the 2nd temperature is T2.
Since the given temperatures are in Celcius form, we have to first convert the temperatures into Kelvin form for proper calculation of maximum efficiency.
So, T1 = 0 + 273 = 273 K
T2 = 800 + 273 = 1073 K
We know,
Maximum efficiency = (T2- T1)/T2
= (1073 - 273) / 1073
= 800 / 1073
= 0.74
= 74 %
Therefore, the maximum efficiency of the heat engine will be 74%.
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I have an unknown volume of gas held at a temperature of 126 K in a container with a pressure of 31 atm. If by increasing the temperature to 209 K and decreasing the pressure to 19 atm causes the volume of the gas to be 9.4 liters, how many liters of gas did I start with?
The volume that was started with if the temperature of 126 K in a container with a pressure of 31 atm is 3.47L.
How to calculate volume?The volume of a gas can be calculated using the combined gas law equation as follows:
P₁V₁/T₁ = P₂V₂/T₂
Where;
P₁ = initial pressureV₁ = final pressureT₁ = initial temperatureP₂ = final pressureV₂ = final volumeT₂ = final temperatureAccording to this question, an unknown volume of gas held at a temperature of 126K in a container with a pressure of 31 atm.
If by increasing the temperature to 209 K and decreasing the pressure to 19 atm causes the volume of the gas to be 9.4 liters, the initial volume is calculated as follows:
31 × V₁/126 = 19 × 9.4/209
0.246V = 178.6/209
0.246V = 0.854
V = 3.47L
Therefore, 3.47L is the volume of the gas that started.
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For Silicon atoms, which I value will show exceptionally large increase over preceding IE values IE1, IE2, IE3, IE4, IE5, IE6
The ionization energy of the fifth electron IE5 would be exceptionally large.
What is the exceptionally large ionization energy?We know that the ionization energy is the energy that is required to remove an electron from an atom. This is the energy that must be supplied in order to make the electron to be able to escape the attractive force of the nucleus of the atom.
We know that Silicon has four electrons in the outermost shell. It is known that electrons that are in the same shell would have relatively close values of ionization energy.
The ionization energy values IE1, IE2, IE3, IE4 all belong to the outermost shell hence we would have an exceptionally large increase over preceding IE values at IE5.
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Please Help
How do I do this?
What volume of a 12.05 M KOH solution would contain 8.48 moles of solute?
Be sure to enter a unit with your answer.
o.703..litter
Explanation:
M=n/v(l)solution
so v=n/M..... =8.48/12.05=0.703...
The area of human activity that consumes the most energy is____.
a. transportation
b. building construction and operation
c. industrial manufacturing
d. heavy engineering and infrastructure
The area of human activity that consumes the most energy is building construction and operation. Option B.
Humans impact the physical environment in many ways including overpopulation pollution burning fossil fuels and deforestation. Such changes are causing climate change soil erosion declining air quality and undrinkable water. Human geography includes the study of all human activities and their effects on the natural environment.
The impact of early human societies on the natural environment was minimal due to the presence of a small number of nomads, mainly through hunting, fishing, and gathering. The human activity system is a fictitious system that represents goal-oriented human activity. These systems are fictitious in the sense that they are intelligent constructs and do not describe actual real-world activities.
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nacl+cl2=2nacl please help
2Na(s)+Cl2(g) 2NaCl(s) is the balanced equation.
Is NaCl an equation that balances?However, closer examination of this equation reveals that, despite having one sodium atom on each side of the arrow, the reactants contain two chlorine atoms whereas the products have just one. This equation is invalid for use in chemical calculations because it is unbalanced.
What legal principle balances equations?Once more, chemical reactions never result in the creation or destruction of atoms. A balanced chemical equation is this kind of chemical equation. A chemical equation that complies with the law of conservation of matter is said to be balanced.
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Which is the least likely to be reduced?
A. Fe3+
B. Cu2+
C. Zn2+
D. Fe2+
Answer:
Zn^2+
Explanation:
What is the physical state of fluorine at 25 degrees?
Answer:
State : Gaseous state Colour : Pale yellow Odour : Irritating
Explanation:
At 25 degree celsius which is approximately known as the room temperature, Fluorine being the highest electronegative element has weak van der waal forces due to which the electrons are apart from each other. At a high enough temperature(room temp. in this case) that is higher than their boiling point, the fluorine atoms become gaseous particles. Hope you understood my explanation....Happy Learning:)
In the lac operon how do multiple proteins form from the same mRNA? due to RNA splicing due to high
due to high functioning spliceosome due to multiple start and stop codons
due to presence of operator sequences
In the Lac operon, multiple proteins form from the same mRNA due to RNA splicing.
What is an operon?An operon is a cluster of genes that are transcribed from the same promoter to give a single messenger RNA (mRNA) molecule that contains multiple coding sequences that are used to make multiple proteins.
Such an mRNA molecule is called a polycistronic mRNA.
An example of an operon is the Lac operon which encodes the genes used to produce the various enzymes required for the metabolism of lactose.
Three of the enzymes in the lac operon are grouped together and are known as lacZ, lacY, and lacA.
Alternative splicing of the mRNA produces the different proteins in operons.
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Part A What happens to the water molecules when heat is added?
When heat is added to the water molecules there is an increase in temperature causing the water molecules to gain kinetic energy and move more rapidly. The water molecules will then move further apart resulting in an increase in the water volume.
What are water molecules?The water molecule is said to be composed of two hydrogen atoms, each linked by a single chemical bond to an oxygen atom.
When heat is added to water molecules, it can result in;
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4. In the space below, write the electron configurations of the following elements: using main shell, Subshell and Noble gas a) oxygen b) sodium c) Chlorine d) Nitrogen
The electronic configuration of oxygen is k =2, L=6 the subshell configuration is 1s², 2s²,2p⁴. Similarly the configuration of sodium is 1s², 2s²,2p⁶,3s¹ and that for chlorine is 1s², 2s²,2p⁶,3s²,3p⁵.
What is electronic configuration?The electronic configuration of an element is the distribution of electrons in different orbitals from the lowest energy level to the highest energy level.
Oxygen is 8th element thus having 8 electrons. The main shell configuration is K= 2, L= 6 and the subshell electronic configuration is 1s², 2s²,2p⁴.
Sodium is 11th element. The main shell electronic configuration is K=2, L=8, M=1. Subshell electronic configuration is 1s², 2s²,2p⁶,3s¹ and the noble gas configuration is [Ne]3s¹. Where Ne have 10 electrons.
Chlorine is 17th element with main shell configuration K =2, L=8, M=7.Subshell configuration 1s², 2s²,2p⁶,3s²,3p⁵ and noble gas configuration is [Ne] 3s² 3p⁵.
Nitrogen is 7th element with K= 2, L=5 and subshells, 1s², 2s²,2p³.
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B
Which compound has the highest melting point?
O Al₂(CO3)3
O C12H22011
OC8H18
O H₂O
Al₂(CO3)3 has the highest melting point. Aluminum carbonate has melting point of 58 degree Celsius.
Why melting point of aluminum is high?The strength of the metallic connection affects a metal's melting point.If aluminum has a greater melting point than magnesium, it probably has a stronger metallic bond.Positive ions and electrons in aluminum would be more attracted to one another, maintaining the structure's stability and resistance to heat.What are uses of aluminum carbonate?A phosphate-binding medication known as aluminum carbonate, aluminum hydroxide, and aluminum oxide is occasionally given to dogs and cats to bind intestinal phosphate, stop the absorption of food phosphate, and reduce the absorption of phosphate excreted by the pancreas. Due to safety issues, it is rarely utilized in people, although cats and dogs don't seem to react negatively to its presence.For more information on melting point kindly visit to
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Someone help, I don't understand this please.
Calculate the average atomic mass of magnesium, given the data in the table below. Show your work.
Magnesium - 24 / Mass 23.9850 / Percent Abundance 78.99%
Magnesium - 25 / Mass 24.9859 / Percent Abundance 10.00%
Magnesium - 25 / Mass 25.9825 / Percent Abundance 11.01%
Answer:
24.984466667
Explanation:
add all mass values and divide by amount (3)
Choose all the molecules in which the central atom has an expanded octet.
BrF3
BF3
SF2
SF6
The molecules in which the central atom has an expanded octet is BrF₃ ans SF₆.
Hypervalent compound is the compound in which central atom contains more than 8 electrons or expanded octet. Hypovalent is the compound in which atom posses less than eighth electron in the valence shell. in In BrF₃ , Bromine has 7 valence electron and fluorine seven electrons . the three F atom complete their octet after the bonding with Br but In Br there are 10 electrons in valence shell . so, BrF₃ has expanded octet. SF₆, the sulfur , sulfur has 6 valence electron and Fluorine has 7 valence electron F atom complete there octet with sulphur but S atom has 12 valence electrons that is expanded octet.
Thus, The molecules in which the central atom has an expanded octet is BrF₃ ans SF₆.
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Help.
I think the answer is C.
Atoms, like people, desire______?
A - Alpha Decay
B - Beta Decay
C - Stability
D - Half-Life
Answer:
I agree, It would either me stabillity or half life.
Explanation:
why do different types of matter have different requirements to phase change?
Different types of matter have different requirements because the pressure and temperature of a substance's environment dictate its phase.
Matter is anything that occupies space and has mass. The states or phases of matter include solids, liquids, gases, and plasma. Any material in a form that has a distinct shape and volume is referred to as a solid. Phase change refers to a shift in the condition of matter. Phase shifts can be carried out by people and occur frequently in nature.
A set of molecules will experience various movements, such as vibrations, rotations, and translations, depending on the average temperature in their vicinity.
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Solid potassium (K) conducts an electric current, whereas solid potassium iodide (KI) does not
because a. solid potassium is a nonmetal
b. solid potassium has a delocalized sea of electrons and KI has its cations and anions
too close together
c. KI has covalent bonds
d. Kl needs to be reacted with another compound first
Solid potassium (K) conducts an electric current, whereas solid potassium iodide (KI) does not because solid potassium has a delocalized sea of electrons and KI has its cations and anions.
How does potassium iodide work?Positively charged potassium and negatively charged iodine combine to form the straightforward inorganic ionic chemical potassium iodide. It is solid at room temperature and resembles sodium chloride or table salt in terms of crystalline structure.
The major uses of potassium iodide are to treat hyperthyroidism and as a dietary supplement for those who are iodine deficient. Additionally, it is utilized as an expectorant to treat asthma and other long-term respiratory disorders, as well as to shield the thyroid gland from radiation.
When potassium iodide is dissolved in water, it splits into cations and anions, enabling free electron movement across the solution. It does not conduct electricity when it is in a dry crystal state, though, like other ionic compounds.
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The girl in the picture is at the highest point in swinging and starts to come down. Which statement best describes the changes
in energy as she begins to descend?
(1 point)
O Kinetic and potential energy are increasing.
O Potential energy is increasing, and kinetic energy is decreasing.
O Kinetic and potential energy are decreasing.
O Kinetic energy is increasing, and potential energy is decreasing.
Kinetic energy is increasing, and potential energy is decreasing statement best describes the changes in energy as she begins to descend.
What energy is called kinetic energy?A particle or an object that is in motion has a sort of energy called kinetic energy. An item gains kinetic energy when work, which involves the transfer of energy, is performed on it by generating a net force. Kinetic energy refers to the energy that a moving thing has as a result of its motion.
What are sources of kinetic energy?Motion is kinetic energy. A object's velocity increases with pace. both the kinetic energy of water flowing (hydraulic energy) and the wind (wind energy), which can be used to produce energy. (Kinetic energy) is a type of energy.
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points)
1. In part 1, you collected data about how the amount of sugar affects the amount of gas produced.
Analyze those data and draw a conclusion. (20 points)
a. Wnat gas inflated the balloons? (2 points)
Since carbohydrates are essential biomolecules the action of sugars fluctuates when enzymes consume substrates of glucose molecules.
Gas pressure is the pressure created by the collision of gas particles with an object. Inside the balloon, gas particles collide with the inner wall of the balloon. It's these collisions that keep the balloon inflated. When carbon dioxide gas fills the balloon, it inflates. The more gas produced, the bigger the balloon will inflate.
The chemical reaction between baking soda and vinegar will inflate the balloon as long as the baking soda and vinegar react. Force Balance: The pressure inside the inflated balloon is greater than the pressure outside. The balloon is stable because the expansion force due to the pressure difference balances the contraction force due to the surface tension of the rubber.
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Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous solution.
C₅H₅NHI
The equation that shows that the salt is acidic is;
C₅H₅NHI + [tex]H_{2} O[/tex] -----> C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]
Is the salt acidic?We know that when we dissolve certain salts in water, the salts could form an acidic, basic or a neutral solution depending on the kind of interaction that the salt could have with the solvent.
Looking at the salt C₅H₅NHI, we can see that the salt can interact with water so as to form the acid that is called hydro iodic acid as shown by the equation; C₅H₅NHI + [tex]H_{2} O[/tex] -----> C₅H₅N + [tex]H_{3} O^+[/tex] + [tex]I^-[/tex]
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Compounds are made up of two or more blank that are blank
The chemical substances that are made up of two or more elements are known as compounds.
Compounds are the chemical substances that are made up of two or more elements which bonded to each other with fixed ratio. When elements combine with each other some of there individual properties are lost and some new properties are observed in the newly formed compounds.
Compounds can be differentiated into two types:
Molecular compounds are the compounds formed by elements which are bonded with each other by covalent bonds. Examples: H₂OIonic compounds or salts are the compounds formed by elements which are bonded with each other by ionic bonds. Example: NaClLearn more about compounds from the link given below.
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Suppose you wanted to measure 53 grams of water for a Phase Change
experiment. Explain why you would not need a Triple Beam Balance:
Triple beam balance is not used to measure the weight of water because it is used to measure mass.
The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.
Spring balance is used to measure the weight of the body whereas beam balance is used to measure the mass of the body. Since the mass of the body remains the same on earth as well as on moon but the acceleration due to gravity differs.
Therefore Triple beam balance is not used to measure the weight of the water.
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Calculate the mass of 45.0 L of Cl₂ at
87.0° C and 950. mm Hg.
Use the Ideal Gas Law formula and here are values for R:
8.134 (L* kPa)/(mol *K)
0.0821 (atm* L)/(mol * K)
62.364 (L * mmHg)/(mol *K)
The mass of 45.0 L of Cl₂ at 87.0° C and 950 mm Hg is 134.7214 g.
Volume = 45.0 L
Temperature = = (87.0 + 273) K = 360 K
Pressure = 950 mm Hg (1 mm Hg = 0.00131579 atm) = 1.25 atm
The formula used to calculate moles is as follows.
∴PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into the above formula as follows:
∴ PV = nRT
=> 1.25 atm × 45.0 L = n × 0.0821 L atm/mol K × 360K
=> n = 1.25 atm × 45.0 L / n × 0.0821 L atm/mol K × 360K
=> n = 56.25 / 29.556 mol
=> n = 1.90 mol
Moles is the mass of a substance divided by its molar mass. So, the mass of Cl₂ (molar mass = 70.906 g/mol) is calculated as follows:
∴ Moles = mass / molar mass
=> 1.90 mol = mass / 70.906 g/mol
=> mass = 134.7214 g
Thus, we can conclude that the mass of 45.0 L of Cl₂ at 87.0° C and 950 mm Hg is 134.7214 g.
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Answer:
Don't follow this!
Explanation:
Your chemistry teacher knows that you are cheating and using this as your own work.
-From said teacher!
Antimony has two naturally occurring isotopes . The mass of antimony -121 is 120.904 amu and the mass of antimony -123 is 122.904 amu. Using the average mass from the periodic table, find the abundance of each isotope (Remember that the sum of the two abundances must be 100).
The two isotopes' relative abundances are: 121 antimony = 57.2% and
123 antimony = 42.8%.
The average mass of all antimony isotopes is 121.76 amu.
Taking into account your data,
(the sum of both abundances is 100%), and
120.904x+122.904y=121.76
Now, some high school algebra will assist us in understanding the solution.
= 120.904x+12.2904x=121.76x=0.572, and thus
x+ y= 1
∴y≈ 0.42
Results show that 121 Sb has a relative abundance of about 57.2% and 123 Sb has a relative abundance of about 42.8% when these decimals are converted into percentages.
There are 2 naturally occurring isotopes of antimony. Antimony-121 has a mass of 120.904 amu, and antimony-123 has a mass of 122.904 amu.
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5. What process occurs when large swaths of forest are cut down, damaging the landscape in an area?
combustion
deforestation
denitrification
nitrogen-fixation
Answer:
deforestation
Explanation:
deforestation is clearing Earth's forests on a massive scale, often resulting in damage to the quality of the land. Forests still cover about 30 percent of the world's land area, but swaths the size of Panama are lost each and every year.
A 191 mL sample of a 1.3 M sucrose solution is diluted to 500 mL.
▼ Part A
What is the molarity of the diluted solution?
According to the given statement 0.49 M is the molarity of the diluted solution.
How do we calculate molarity?Molarity (M), which is calculated by dividing the solute's weight in moles by the the solution's volume in liters, is the most widely used unit to express solution concentration: litres of solution/moles of solute equals M.
Briefing:Utilizing the dilution law equation
M₁V₁ = M₂V₂
Where
M₁ is the initial molarity
V₁ is the initial volume
M₂ is the final molarity
and V₂ is the final volum
From the given information,
M₁ = 1.3 M
V₁ = 191 mL
V₂ = 500.0 mL
The result of entering the parameters into the formula is
1.3 * 191 = M[tex]_2[/tex] * 500
M[tex]_2[/tex] = 1.3 * 191 / 500
M[tex]_2[/tex] = 248.3/500
M[tex]_2[/tex] = 0.4966 M
M[tex]_2[/tex] ≅ 0.49 M
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Question
Seismic waves travel at different speeds according to type.
What is the speed of seismic waves from fastest to slowest?
Responses
S waves, L waves, P waves
S waves, L waves, P waves
P waves, S waves, L waves
P waves, S waves, L waves
L waves, S waves, P waves
L waves, S waves, P waves
P waves, L waves, S waves
Since Seismic waves travel at different speeds according to type, the speed of seismic waves from fastest to slowest is option C: P waves, S waves, L waves.
Which seismic waves are moving more quickly?P waves leave the earthquake first and go the furthest. Rock oscillates perpendicular to the direction of wave propagation in S or shear waves. In rock, S waves typically move at a pace of roughly 60% that of P waves, and they always come after the latter.
Therefore, if we examine a seismogram, we anticipate that the P-wave, which is the quickest wave, will arrive first, followed by the S-wave and then the Love and Rayleigh waves, which are the slowest waves.
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a forest is a habitat for many living things. what happens to these different living things
Forest is a habitat for many plants and animals because it provides a suitable environment for them.
Forest is a habitat for many plant life and animals as it offers a appropriate environment for them. As an instance, neem, Sheesham, Palash, tiger, porcupine, elephants, jackal and so forth. The ground beneath the tree of the forest is the forest floor.
It causes habitat destruction, accelerated chance of predation, reduced food availability, and lots greater. As a result, some animals lose their homes, others lose meals assets – and ultimately, many lose their lives. In reality, deforestation is one of the essential causes of extinction.
Weather trade also alters the life cycles of flora and animals. as an instance, as temperatures get warmer, many plant life are starting to develop and bloom earlier inside the spring and live to tell the tale longer into the fall. A few animals are waking from hibernation sooner or migrating at different instances, too.
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Which force slows a skateboard when a skateboarder puts a foot down to brake?
O motion
O gravity
O friction
O inertia
Answer:
It is definitely friction
I need help with #5 please. thank you
Answer:
Atom 3
Explanation:
Because it has electronic configuration of 10 which it is an atomic number of neon. And neon is a gas which is stable, hence does not react
How do I balance these equations? Please explain so I can learn how.
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is
CH[tex]_4[/tex]+4S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
The skeletal equation is
CH[tex]_4[/tex]+S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+H[tex]_2[/tex]S
The number of carbon atoms on reactant and product side is 1, so C is balanced.
The number of hydrogen atoms on reactant side is 4 while on product side it is 2, so to balance we need to multiply H[tex]_2[/tex]S by 2.
CH[tex]_4[/tex]+S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S
The number of sulfur atoms on reactant side is 1 while on product side it is 4, so to balance we need to multiply S by 4.
CH[tex]_4[/tex]+4S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S
Therefore, the balanced equation is
CH[tex]_4[/tex]+4S[tex]\rightarrow[/tex]CS[tex]_2[/tex]+2H[tex]_2[/tex]S
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