An engineer claims to have invented a steady-state flow device in which the inlet is steam at 300°C and 500 kPa. The outlet is saturated steam at 100°C, is adiabatic, and produces approximately 388 kJ per kg of steam passed through the device. Should we believe his claim?
Answers
No.
Explanation:
Based on the provided information, we should not believe the engineer's claim about the steady-state flow device. The device is said to have an inlet with steam at 300°C and 500 kPa and an outlet with saturated steam at 100°C, being adiabatic and producing approximately 388 kJ/kg of steam passed through.
To evaluate this claim, we can use the First Law of Thermodynamics for a steady-state flow process, which states that the energy added to the system must be equal to the energy leaving the system plus the work done by the system.
The inlet steam has a higher temperature and pressure than the outlet steam, so there must be a decrease in enthalpy (internal energy) as the steam passes through the device. The adiabatic condition means that no heat is transferred in or out of the system, so the decrease in enthalpy must be equal to the work done by the system.
However, the claim states that the device produces 388 kJ/kg of steam, which would require an increase in enthalpy instead of a decrease. This contradicts the First Law of Thermodynamics and the given conditions for the steady-state flow process.
Therefore, we should not believe the engineer's claim about the steady-state flow device, as it does not align with the fundamental principles of thermodynamics.
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Related Questions
4. A shepherd is increasing his heard from 300 goats to 600 goats. Currently, the land is sufficient to feed 300 goats; what could be the result?
Answers
Answer: 300 goats want get food
Explanation:
How do you most effectively increase the buffering capacity of a pH 4.9 buffer containing acetate (pKa 4.76)
Answers
A conjugate base solution with a pH between 8 and 10 has little buffer capacity, however at higher pHs, the strong base's presence begins to matter more.
Because of the large concentration of H + cations, a pure acetic acid solution with a pH below 3 already has a pH that is resistant to changes. This is because the concentration of the capacity is so high that it is unaffected by changes in the equilibrium of the solution brought on by the concentration of other ions. Why is a buffer more effective if its pKa is close to the pH? Why does a buffer function best when pH and pKa are equal? Why does increasing the pH by a basic or an acid.
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Is this equation completely balanced?
2C8H3 + 2502 → 8C02 + 18H20
Answers
Answer:
No, because the number of carbon, hydrogen & oxygen atoms on both sides of the equation are not equal.
Explanation:
For an equation to be completely balanced, there should be equal number of reactants and products.
Number of carbon atoms on reactant side = 16
Number of hydrogen atoms on reactant side = 16
Number of oxygen atoms on reactant side = 50
Number of carbon atoms on product side = 8
Number of hydrogen atoms on product side = 36
Number of oxygen atoms on product side = 34
Therefore, we can conclude that total number of reactants does not equal total number of products therefore, this equation is not completely balanced.
[RevyBreeze]
What is an element?
What is it represented by?
What is it made up of?
Give an example
Answers
Answer:
what is an element?
element is a pure substance which cannot be broken down by chemical means
what is it represented by?
By its symbol and atomic number
what is it made up off?
It is made up of it's owm type of atom.
Example
carbon,oxygen,hydrogen,gold,silver,iron
Identity elements x has 2 electron in k shell 8 electron in L shell and 5 electron in M shell
Answers
Explanation:
Based on the information provided, it's possible to determine that the identity element in question is an element with atomic number 20, Calcium (Ca). Calcium has 2 electrons in the K-shell, 8 electrons in the L-shell, and 5 electrons in the M-shell.
How many moles are there in 134.76 grams of potassium nitrate?
Answers
To calculate the number of moles of potassium nitrate in 134.76 grams, we can use the following formula:
Number of moles = Mass / Molar mass
Number of moles = 134.76 g / 101.1 g/mol
Number of moles = 1.33 mol
Therefore, there are 1.33 moles of potassium nitrate in 134.76 grams of the substance.
In the addition of HBr to 1-butyne, the electrophile in the first step of the mechanism is Multiple Choice the Csp-H1s bond of 1-butyne. the C-C triple bond of 1-butyne. the H atom in HBr. the Br ion.
Answers
The electrophile in the addition of HBr to 1-butyne is the H atom in HBr.
What is an electrophile?An electrophile is a positively charged specie or an electron deficient specie which is able to accept a lone pair of electrons.
An electrophilic addition is one in which the attacking agent is a nucleophile. The electrophile in the addition of HBr to 1-butyne is the H atom in HBr.
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What conclusion can you draw about the ability of metals to hold on to and attract electrons, as
compared to nonmetals?
Answers
Answer:
Metals react by losing electrons. So, there is high reactivity due to lower attraction. Non-metals react by gaining electrons. So, there is high reactivity due to higher attraction.
Explanation:
Metals react by losing electrons. So, there is high reactivity due to lower attraction. Non-metals react by gaining electrons. So, there is high reactivity due to higher attraction. Also, electrons lost by metals transfer to the nonmetals. It is easier for the metals to lose their valance electrons and form cations rather than gaining electrons.
Metals do not hold on to or attract electrons while nonmetals hold on to or attract electrons.
In the periodic table, metals are found towards the left hand side of the table while nonmetals are found towards the right hand side of the table.
Electron affinity of elements increase from left to right across the period. Electron affinity refers to the ability of elements to attract or hold electrons. This ability increase steadily across the period.
Usually, the electron affinity values of nonmetals are very high showing that they easily hold on to and attract electrons while the electron affinity values of metals is very low showing that they do not easily hold on to and attract electrons.
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the unique, three-dimensional structure of a protein molecule is determined largely by stocks and bonds. covalent bonds. oxygen bonds. hydrogen bonds. ionic bonds.
Answers
The unique, three-dimensional structure of a protein is determined largely by hydrogen bonds (c)
The complete questions should have as follow :
The unique, three-dimensional structure of a protein is determined largely by …
a. Covalent bonds
b. Oxygen bonds
c. Hydrogen bonds
d. Ionic bonds
Effect of bonds on three-dimensional structure of a protein
Proteins are made of amino acids which fold into unique three dimensional shapes. The unique, three-dimensional structure of a protein is determined by its amino acid sequence. Interactions between amino acids are influenced by the chemical bonds.
Each of amino acid has a unique side chain. The chemistry properties of amino acid side chains has a big influence on protein structure because side chain can bond with one another to hold a protein in certain shape.
Although the overall conformation of each protein is unique, two patterns are often found. Alpha and beta helixes patterns are the most common because they result from hydrogen-bonding between the N–H and C=O Hydrophobic side chain bond each other via van deer waals interactions.Cysteine are only amino acid that forming covalent bond.
Thus, the majority of bonds formed are noncovalent. Folded protein are stabilized by thousands of noncovalent bonds between amino acids.
All interactions, strong or weak, determine the final three dimensional shape of protein. Because side chain interaction, the location and the sequence of amino acid in particular protein guides where the bends and folds occur in protein.
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The unique, three-dimensional structure of a protein molecule is determined largely by hydrogen bonds. The correct answer is the second option.
A hydrogen bond is a type of chemical bond that occurs between a hydrogen atom and another atom with high electronegativities, such as oxygen, nitrogen, or fluorine. It is a weak bond that forms when the positive charge of the hydrogen atom is attracted to the negative charge of the other atom.
Hydrogen bonds are important in many biological processes, such as the folding and stability of proteins and the base-pairing of DNA. They are also responsible for the unique properties of water, such as its high boiling point and surface tension.
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SOMEONE PLEASE I NEED HELP WITH CHEMISTRY !! ITS URGENT
Draw a diagram for Copper(ll) nitrate & Cu(NO3)2 in a 250.0 mL of aqueous solution to show how to make the solution. Information to include…
Molarity of solution - 0.1176
She then draws 30.0 mL of the solution into a pipet. (MOLES OF CU(NO3)2 - 0.00352)
THEN : Mrs. Mandochino empties the 30.0 mL into an empty volumetric flask and fills it to the 240.0 mL mark with distilled water.
What is the molarity of this new solution?
Make sure to have 5 ACCURATE steps drawn. Your drawing should only be 1 picture but include 5 steps.
Answers
I can help you with the chemistry problem and describe the steps, but I cannot draw the diagrams. Here are the steps to create the solution and calculate the new molarity:
Step 1: Calculate the moles of Cu(NO3)2 needed.
Molarity = moles of solute / volume of solution (L)
0.1176 M = moles of Cu(NO3)2 / 0.250 L
moles of Cu(NO3)2 = 0.1176 * 0.250 = 0.0294 mol
Step 2: Dissolve the required moles of Cu(NO3)2 in water.
Weigh 0.0294 moles of Cu(NO3)2 and dissolve it in a beaker with a smaller amount of distilled water (less than 250 mL).
Step 3: Transfer the solution to a 250 mL volumetric flask.
Pour the dissolved Cu(NO3)2 solution from the beaker into a 250 mL volumetric flask. Rinse the beaker with distilled water and pour the rinse water into the flask to ensure all the Cu(NO3)2 is transferred.
Step 4: Fill the volumetric flask to the 250 mL mark.
Add distilled water to the volumetric flask until it reaches the 250 mL mark. Mix the solution thoroughly.
Step 5: Draw 30.0 mL of the solution into a pipet.
Use a pipet to carefully draw 30.0 mL of the 0.1176 M Cu(NO3)2 solution from the volumetric flask.
Step 6: Transfer the solution to a 240 mL volumetric flask.
Empty the 30.0 mL from the pipet into an empty 240 mL volumetric flask.
Step 7: Fill the 240 mL volumetric flask to the mark.
Add distilled water to the 240 mL volumetric flask until it reaches the 240 mL mark. Mix the solution thoroughly.
Step 8: Calculate the new molarity.
M1V1 = M2V2
0.1176 M * 0.030 L = M2 * 0.240 L
M2 = (0.1176 * 0.030) / 0.240
M2 ≈ 0.0147 M
The molarity of the new solution is approximately 0.0147 M.
Molecules have
Question 6 options:
A)
both potential and kinetic energy.
B)
only potential energy.
C)
only kinetic energy.
D)
neither kinetic nor potential energy
Answers
what type of reaction takes place between methane and chlorine
Answers
Answer and Explanation:
When methane (CH4) and chlorine (Cl2) react, a substitution reaction takes place. Specifically, the reaction is a halogenation reaction, in which one or more hydrogen atoms in the methane molecule are replaced by chlorine atoms. The reaction can be represented by the following equation:
CH4 + Cl2 → CH3Cl + HCl
In this equation, CH3Cl represents chloromethane, which is a type of organochlorine compound. The reaction is typically initiated by ultraviolet (UV) light or heat, and it proceeds through a series of free radical chain reactions. The products of the reaction are typically a mixture of chloromethane and hydrogen chloride (HCl) gas.
The improvement of energy efficiency in the United States is important. Which scenario is least
likely to occur due to improved energy efficiency in the United States?
O Allow more time to improve use of renewable resources.
O Increase environmental problems.
Make nonrenewable resources last longer.
Reduce dependence on other countries.
Answers
Answer:
increase environmental problems
how can we separate the sugar from sugar solution
Answers
3. How many moles are 7.32 x 102
atoms of phosphorous?
Answers
is Jupiter's volume more than 1,000 times that of Earth
Answers
Answer:
cómo lo ahí no sé amigo blue the rous
Answer:
yes it is i did it on ixl
355 g of chlorine gas (MW = 70.9 g/mol) isheld in a vessel with a fixed volume of 70.0 L. What is the pressure of the gas in atmospheres if it's temperature is 30.0 degrees celcius?
Answers
Answer:
1.78 atm
Explanation:
From the question given above, the following data were obtained:
Mass of Cl = 355 g
Molecular weight of Cl = 70.9 g/mol
Volume (V) = 70.0 L
Temperature (T) = 30 °C
Pressure (P) =?
Next, we shall determine the number of mole in 355 g of chlorine (Cl). This can be obtained as follow:
Mass of Cl = 355 g
Molecular weight of Cl = 70.9 g/mol
Mole of Cl =.?
Mole = mass /molecular weight
Mole of Cl = 355 /70.9
Mole of Cl = 5 moles
Next, we shall convert 30 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Temperature (T) = 30 °C
Temperature (T) = 30 °C + 273 = 303 K
Finally, we shall determine the pressure of the gas as illustrated below:
Volume (V) = 70.0 L
Number of mole (n) = 5 moles
Temperature (T) = 303 K
Gas constant (R) = 0.0821 atm.L/Kmol
Pressure (P) =?
PV = nRT
P × 70 = 5 × 0.0821 × 303
P × 70 = 124.3815
Divide both side by 70
P = 124.3815 / 70
P = 1.78 atm
Therefore, the pressure of the gas is 1.78 atm
The pressure of the gas in atmospheres if it's temperature is 30.0 degrees celcius is 1.77 atm.
How do we calculate pressure?Pressure of the given gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure of chlorine gas = ?
V = volume of chlorine gas = 70 L
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature chlorine = 30 degree celsius = 303 K
n is the moles of gas which can be calculated as:
n = W/M, where
W = given mass of chlorine gas = 355g
M = molar mass of chlorine gas = 70.9g/mol
n = 355/70.9 = 5 moles
On putting all these values on the above equation and calculate for P, we get
P = (5)(0.082)(303) / 70
P = 1.77 atm
Hence required pressure is 1.77 atm.
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Which of the following elements are already balanced in this equation? FeS₂ + Cl₂ → FeCl₃ + S₂ Cl₂
Answers
Fe and S are already balanced in this equation
Further explanationBalanced indicates that the number of elements in question has the same number of atoms both on the left side (the number on the reactants side) and on the right side (the number on the product side)
Even though one of the elements is said to be balanced, the chemical equation as a whole cannot be said to be balanced, because the chemical equation has several components of the constituent elements.
To balance chemical equations, a coefficient in front of the compound is usually added either in the reactants or products
Reaction
FeS₂ + Cl₂ → FeCl₃ + S₂Cl₂
From this equation, it can be shown that: the Fe and S elements are balanced because the numbers are equal both on the left and right, while the Cl elements are not yet balanced
Fe, left=1, right=1 ⇒ balanced
S, left=2, right=1 ⇒ balanced
Cl, left=2, right=5⇒ not balanced
For balanced equations:
2FeS₂ + 5Cl₂ → 2FeCl₃ + 2S₂Cl₂
one natural source of carbon dioxide.
Answers
Answer: decomposing biomass
explain how natural selecting leads to predominance and suppresion of traits in a population
This is actually science and when i say science, i mean as in like genetic mutation, DNA, etc, i just cant find the right subject.
Answers
Natural selection is a process in which organisms that are better adapted to their environment tend to survive and produce more offspring. These offspring are likely to inherit the traits that made their parents successful, which can lead to predominance and suppression of certain traits in a population.
Natural selection can lead to the predominance of certain traits in a population because organisms that possess advantageous traits are more likely to survive and reproduce, passing on those traits to their offspring. For example, if a population of birds lives in an environment where seeds are scarce, birds with larger beaks that are better suited for cracking open tough seeds are more likely to survive and reproduce. Over time, this can lead to a predominance of birds with large beaks in the population.Conversely, natural selection can also lead to the suppression of certain traits in a population. This occurs when organisms with certain traits are less likely to survive and reproduce, which means that those traits are less likely to be passed on to future generations. For example, if a population of moths lives in an environment where predators can easily spot them because of their light coloration, moths with darker coloration that are better camouflaged are more likely to survive and reproduce. Over time, this can lead to a suppression of the light coloration trait in the population.Natural selection is driven by genetic variation, which is created by mutation, gene flow, and sexual reproduction. Mutations are random changes in DNA that can create new traits, while gene flow and sexual reproduction can introduce new traits into a population. The traits that are favored by natural selection are those that increase an organism's chances of survival and reproduction in a given environment, which can lead to their predominance in a population.For such more question on camouflaged
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In the chemical formula for aluminum oxide, what would be the subscript for aluminum?
Group of answer choices
A. 2
B. 3
C. -2
D. -3
Answers
What contribution did John Dalton make to atomic theory? a. He discovered that every atom was positively charged. b. He discovered that atoms had nuclei. c. He discovered that every element consisted of one type of atom. d. He discovered that atoms could be divided into smaller parts.
Answers
John Dalton's main contribution to atomic theory was the idea that every element consisted of one type of atom. Option C is correct.
In the early 19th century, John Dalton proposed that all matter is made up of small, indivisible particles called atoms. He also suggested that atoms of the same element are identical in their physical and chemical properties, and that atoms of different elements combine in simple, whole-number ratios to form compounds.
While Dalton's atomic theory was not completely correct (for example, atoms can be divided into smaller parts, as in the case of subatomic particles), it was an important step in the development of modern atomic theory.
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Sulfuric acid ( H2SO4) is used in the production of phosphate fertilizer. The reaction is: Ca3 (PO4)2+3H2SO4 = 3CaSO4 + 2H3PO4, How many grams of the two products are formed in 10.0 moles of H2SO4 is reacted with enough calcium phosphate [ Ca3 (PO4)2) ?
Answers
From the balanced equation, we can see that 3 moles of CaSO4 and 2 moles of H3PO4 are produced for every 3 moles of H2SO4 that react with 1 mole of Ca3(PO4)2.
Thus, we can use stoichiometry to calculate the amount of products formed when 10.0 moles of H2SO4 react with enough Ca3(PO4)2:
moles of CaSO4 produced = 10.0 moles H2SO4 × (3 moles CaSO4 / 3 moles H2SO4) = 10.0 moles CaSO4
moles of H3PO4 produced = 10.0 moles H2SO4 × (2 moles H3PO4 / 3 moles H2SO4) = 6.67 moles H3PO4
To calculate the mass of each product, we need to know their molar masses. The molar mass of CaSO4 is 136.14 g/mol, and the molar mass of H3PO4 is 98.00 g/mol. Thus, we can use these molar masses to convert the moles of products to grams:
mass of CaSO4 produced = 10.0 moles CaSO4 × 136.14 g/mol = 1361.4 g CaSO4
mass of H3PO4 produced = 6.67 moles H3PO4 × 98.00 g/mol = 653.86 g H3PO4
Therefore, when 10.0 moles of H2SO4 react with enough Ca3(PO4)2, 1361.4 grams of CaSO4 and 653.86 grams of H3PO4 are produced.
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If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.11, which of the following is TRUE? a) [HCHO2] < [NaCHO2]; b) [HCHO2] = [NaCHO2]; c) [HCHO2] << [NaCHO2]; d) [HCHO2] > [NaCHO2]; e) It is not possible to make a buffer of this pH from HCHO2 and NaCHO2
Answers
If the pKa of HCHO₂ is 3.74 and the pH of an HCHO₂/NaCHO₂ solution is 3.11, then the statement which is correct is [HCHO₂] > [NaCHO₂].
Buffer solution is a solution which is a mixture of weak acid and its conjugate base or vice a versa. It shows a very little change in pH when strong acid or base is added in it.
Since NaCHO₂ is a basic salt of formic acid and it acts as a buffer solution. The pH of buffer solution is calculated by the formula
pH=pKa+log([base]/[acid])
We know that HCHO₂ is an acid, where NaCHO₂ is a base. Plug all values in the formula
3.11=3.74+log([NaCHO₂]/[HCHO₂])
3.11-3.74=log([NaCHO₂]/[HCHO₂])
log([NaCHO₂]/[HCHO₂])=-0.63
Take antilog on both side
[NaCHO₂]/[HCHO₂]=10^(-0.63)
[NaCHO₂]/[HCHO₂]=0.234423
Multiply both side by [HCHO₂]
([NaCHO₂]/[HCHO₂])×[HCHO₂]=0.234423×[HCHO₂]
[NaCHO₂]=0.234423×[HCHO₂]
From the above calculation, it is observed that concentration of NaCHO₂ is less than the concentration of HCHO₂. Hence, [HCHO₂] > [NaCHO₂].
Therefore, if the pKa of HCHO₂ is 3.74 and the pH of an HCHO₂/NaCHO₂ solution is 3.11, then the statement which is correct is [HCHO₂] > [NaCHO₂]. Hence, 'option d' is correct.
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A dextrose solution with a mass of 200 g has 15.8g of dextrose dissolved in it what is the mass/mass percent concentration of the solution
Answers
Answer: I don’t know I just want the chemistry badge
Explanation:
Explain why an organism dies if the respiratory and circulatory system 'paused' for a while.
Answers
Answer:
Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body
Explanation:
2. What is the maximum number of electrons that can occupy the n=3 shell of an atom, including all subshells within n=3? a) 2 b) 6 c) 10 d) 18 e) 32.
Answers
Answer:
18
Explanation:
use the equation 2n^2
explain what is happening at a molecular level during the dutch-process. b. rank the molecules from least likely to be present after the dutch process to most likely to be present after the dutch process. c. using the information above and your knowledge of acid-base chemistry provide an explanation for your rankings that addresses how you used structure to solve this problem. do not just quote pka values.
Answers
a) the Dutch process at the molecular level Pyrol and benzyl alcohol do not react with NaOH.
b) The molecules are ranked from those that are least likely to be present after the Dutch process to those that are most likely to be present after the Dutch procedure Pyrrol is more likely to be present than butyric acid, which has a lower likelihood of being there.
c) Butyric acid's carboxylic acid is removed using NaOH.
The acidic chemicals with a bitter taste are washed in the Dutch procedure using a strong base like NaOH. Basic substances are not cleansed and only very acidic substances are washed thoroughly. However, vanillin is only somewhat acidic, thiophenol is less acidic, butyric acid is acidic, benzyl alcohol is neutral, and pyrrol is basic.
a) Benzyl alcohol and pyrrol do not react with NaOH. However, butyric acid combines with it to produce sodium butyrate (CH₃CH₂CH₂COONa), vanillin creates its sodium salt ((2-OCH₃,4-CHO)C₆H₃ONa), and thiophenol creates sodium benzenethiolate (C₆H₅SNa).
b) Butyric acid is least likely to be present and pyrrol is most likely to be present. Butyric acid is followed in increasing order of presence by vanillin, thiophenol, benzyl alcohol, and pyrrole.
c). NaOH is used to wash away the carboxylic acid in butyric acid. Due to the aromatic ring, vanillin and thiophenol are acidic and combine with NaOH to generate a sodium salt that is water soluble. Because it is neutral and pyrrole is basic, neither benzyl alcohol nor pyrrole will react with NaOH.
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What is the pH of a solution of HCL with a concentration of
5 x 10^-4
Answers
0.0005
Explanation:
The negative exponent means you must move the decimal point 4 positions to the left. 5 can also be written as 5.0 to show the decimal point. To move it 4 positions to the left gives: 0.0005
Hope this helps
what is the mass in grams of lead () atoms? be sure your answer has the correct number of significant digits. note: reference the fundamental constants table for additional information.
Answers
A lead (Pb) atom's mass is (Molecular Pb has a mass of 207.2 g/mol).
How do you determine the mass of the a lead atom?
The average mass of a lead atom is 202 amu. The mass of an Avogadro's mass of lead atoms is also 202 grams. Divide the usual atomic weight of lead by Avogadro's number to get the weight of a lead atom in grams.
How is the mass determined?For a body, mass is constant. Mass can be measured using the formula: mass = volume density. A mass's weight is a measurement of the gravitation force at work on it.
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