Answer:
New volume = 105.6 mL
Explanation:
Given that,
Temperature, T = 240.0 K
Pressure, P = 670 mm Hg
Volume, V = 128 mL
New temperature = -75°C = 198 K
We need to find the new volume. Let it is V'. The relation between volume and the temperature is given by :
[tex]V=kT\\\\\dfrac{V}{V'}=\dfrac{T}{T'}\\\\V'=\dfrac{VT'}{T}\\\\V'=\dfrac{128\times 198}{240}\\\\V'=105.6\ mL[/tex]
So, the new volume is equal to 105.6 mL.
Prove how the Law Conservation of Mass and Enery apply to Cellular Respiration
Answer:
mass and energy is reused when those things happen
A weather balloon is inflated to a volume of 26.7 L at a pressure of 748 mmHg and a
temperature of 28.4 °C. The balloon rises in the atmosphere to an altitude where the pressure is
400. mmHg and the temperature is -15.6 °C.
Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude.
Answer:
42.64 L
Explanation:
Using the combined law equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information in this question,
P1 = 748mmHg
P2 = 400mmHg
V1 = 26.7 L
V2 = ?
T1 = 28.4 °C = 28.4 + 273 = 301.4K
T2 = -15.6 °C = -15.6 + 273 = 257.4K
Using P1V1/T1 = P2V2/T2
748 × 26.7/301.4 = 400 × V2/257.4
66.26= 1.554 V2
V2 = 66.26 ÷ 1.554
V2 = 42.64 L
What is the thermal efficiency of an engine that takes n moles of diatomic ideal gas through the cycle
Answer:
The thermal efficiency of an engine is [tex]0.15[/tex] that is 15%
Explanation:
Specific heat of a gas at constant volume is
[tex]C_{v}=\frac{fR}{2}[/tex]
here, [tex]f=[/tex]degree of freedom
[tex]R=[/tex]universal gas constant
Thermal efficiency of a cycle is
[tex]\frac{total workdone}{gross heat absorbed}[/tex]
Gross heat absorbed is amount of heat that absorbed.
ω[tex]=P_{o} V_{o}[/tex]
[tex]Q_{AB}=[/tex]Δ[tex]V_{AB}+[/tex]ω[tex]_{AB}[/tex][tex]=nC_{v}(T_{f}-T_{i} )[/tex]
[tex]=n\frac{f}{2}(RT_{f}-RT_{i} )[/tex][tex]=\frac{f}{2}(P_{o}V_{o} )[/tex]
[tex]Q_{BC}=n(\frac{f}{2}+1 )R(T_{f}-T_{i} )[/tex]
[tex]=(\frac{f}{2} +1)(4P_{o}V_{o}-2P_{o}V_{o} )[/tex]=[tex]=(\frac{f}{2}+1)2P_{o}V_{o}[/tex]
[tex]Q_{CD}=-ve and Q_{DA}=-ve[/tex] these 2 are not the part of gross heat
η[tex]=\frac{P_{o}V_{o} }{(\frac{3f}{2}+2 )(P_{o}V_{o})}[/tex]
[tex]=\frac{1}{(\frac{3f}{2}+2 )}[/tex]
For monoatomic gas [tex]f=3[/tex]
η[tex]=\frac{2}{13}[/tex]
[tex]=0.15[/tex]
Use the fact that to determine how much the pressure must change in order to lower the boiling point of water by a small amount 3.20e-01 K. You may assume that the entropy and density of the liquid and gas are roughly constant for these small changes. You may also assume that the volume per molecule of liquid water is approximately zero compared to that of water vapor, and that water vapor is an ideal gas. Useful constants: Atmospheric pressure is 101300 Pa The boiling point of water at atmospheric pressure is 373.15 K The entropy difference between liquid and gas per kilogram is 6.05e 03 The molecular weight of water is 0.018 kg/mol. (a) 0.00e 00 Pa (b) 1.14e 03 Pa (c) 6.85e 26 Pa (d) 4.24e 05 Pa (e) 3.81e 28 Pa
Complete Question
Use the fact that [tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex] to determine how much the pressure must change in order to lower the boiling point of water by a small amount 3.20e-01 K. You may assume that the entropy and density of the liquid and gas are roughly constant for these small changes. You may also assume that the volume per molecule of liquid water is approximately zero compared to that of water vapor, and that water vapor is an ideal gas. Useful constants: Atmospheric pressure is 101300 Pa The boiling point of water at atmospheric pressure is 373.15 K The entropy difference between liquid and gas per kilogram is 6.05e 03 J/kgK The molecular weight of water is 0.018 kg/mol. (a) 0.00e 00 Pa (b) 1.14e 03 Pa (c) 6.85e 26 Pa (d) 4.24e 05 Pa (e) 3.81e 28 Pa
Answer:
Correct option is B
Explanation:
From the question we are told that:
Given Equation [tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex]
Change of boiling point \triangle [tex]H=3.20e-01 K[/tex]
Generally the equation for Change in time is mathematically given by
[tex]d\mu=\frac{V}{N}dp-\frac{s}{N}dT[/tex]
[tex]dp=\frac{s}{v}dT[/tex]
Where
[tex]s=Entropy\ difference *molar\ weight[/tex]
[tex]s=6.05*10^3*0.018j/mol.k[/tex]
And
[tex]V=\frac{RT}{P}[/tex] (from ideal gas equation)
Therefore
[tex]dp=\frac{Ps}{RT}dT[/tex]
[tex]dp=\frac{101300*6.05*10^3*0.018}{8.314*373.15}3.20*10^{-1}[/tex]
[tex]dp=1137.873pa[/tex]
[tex]dp=1.14e 03 Pa[/tex]
Therefore correct option is B
Use the data below to answer questions 1 - 2. To study heat transfer, a group of students conducted the following experiment. They took two 100 ml water samples at two different temperatures, mixed them together, and recorded the temperatures. Cup Temperature (°C) 1 Volume (ml) 50 50 40 Mixture of 1 and 2 100 watel 1. Based on the information provided in the table above, in which direction will heat flow between the two wate samples when they are mixed? A. Heat will flow from cup 1 to cup 2. B. Heat will flow from cup 2 to cup 1. C. Heat will flow from both cups. D. No heat flow will occur.
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST PLUS 20 POINTS If CO2 was added to this system what would the outcomes for this reaction be?
CO2 + H2O <-> H2CO3
Question 4 options:
It would shift to the right, favor the forward reaction and the rate of reaction would decrease.
It would shift to the left, favor the forward reaction and the rate of reaction would increase.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
It would shift to the left, favor the reverse reaction and the rate of reaction would decrease.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
(third option)
A 2.0 mol ideal gas system is maintained at a constant volume of 4.0 L. If 100 J of heat is added, what is the work done on the system
Answer:
Work done on the system is zero , hence no work is done since the process is isochoric. There is no work done if the volume remains unchanged. (Though the temperature rises, work is only accomplished when the volume of the gas changes.)
Explanation:
ISOCHORIC PROCESS - An isochoric process, also known as a constant-volume process, isovolumetric process, or isometric process, is a thermodynamic process in which the volume of the closed system undergoing the process remains constant through the process. The heating or cooling of the contents of a sealed, inelastic container is an example of an isochoric process. The thermodynamic process is the addition or removal of heat, the closed system is established by the isolation of the contents of the container, and the constant-volume condition is imposed by the container's inability to deform. It should be a quasi-static isochoric process in this case.
Hence , the work done in the system is zero.
What is the general form for the simplest type of acid-base reaction?
O A. Acid + base > H+ + OH-
B. Acid + base → base + acid
C. Acid + base + salt + water
D. Acid + base → solid + water
Answer:
Your answer is C
Explanation:
When an acid and base react, the acidic hydrogen ion and the basic hydroxide ion in each acid and base neutralize each other and form water. Meanwhile the conjugate base and conjugate acid (the leftover compounds) react to form an ionic molecule, or a salt. (In chemistry, when an anion and a cation form an ionic bond the new molecule is called a salt). Hope this helps!
True or false: A skeleton equation in chemistry shows the relative amounts of all materials in the reaction
Answer:
false im pretty sure.
help ! thank u / ill give brainlist !
Give two examples of energy transformations that occur throughout the journey to or on the planet.
Answer:
Our bodies convert chemical energy in our food into mechanical energy for us to move.
An electric fan transforms electrical energy into kinetic energy
Reword it tho
Hope this helps!!
An iron bar is to be electroplated with zinc.
a. Identify what will act as the two electrodes for the cell and identify the anode and the cathode.
b. Write the half reactions occurring at each electrode.
c. Identify a solution that would make a suitable electrolyte for this cell.
d. Identify which electrode will be attached to the negative post of the battery and which electrode will be attached to the positive post and explain.
Answer:
a)Anode-Zinc
Cathode - Iron
b) At the anode;
Zn(s) -----> Zn^+(aq) + 2e
At the cathode;
Zn^+(aq) + 2e -----> Zn(s)
c) ZnSO4
d) The electrode which is connected to the positive post of the battery is the anode.
The electrode which is connected to the negative post of the battery is the cathode.
Explanation:
Electroplating is an electrolytic process in which a metal is used to cover the surface of another metal. The plating substance is the anode while the plated substance is the cathode. The electrolyte is a salt of the plating metal.
The anode of an electrolytic cell must be maintained at a positive potential with respect to the cathode hence it is connected to the positive terminal of the battery. The cathode must be maintained at a negative potential hence it is connected to the negative terminal of the battery.
I need help pleaseee
Answer: So, If we mix 40.0 g of NaOH with enough distilled water to make 500 mL, we will get a 2.00 M NaOH solution.
Explanation: how do you show pictures like how you did??
The following experiment was performed: A white solid was added to a test tube containing water. The solid completely dissolved and the solution was colorless. Chlorine was added the the solution turned an dark orange color. Hexane was added, the test tube was corked, and the contents was mixed. It was then noted that the hexane was purple in color. What was likely the identity of the white solid
Answer:
Potassium iodide
Explanation:
The white solid introduced into the solution is potassium bromide. This is an ionic solid thus it quickly dissolves in water to yield a colorless solution.
When chlorine is added to this solution, the iodine is displaced since chlorine is above iodine in the electrochemical series.
When mixed with hexane, the color of the solution changes to purple.
The electron pair in a C-F bond could be considered Question 3 options: closer to C because carbon has a larger radius and thus exerts greater control over the shared electron pair closer to C because carbon has a lower electronegativity than fluorine an inadequate model since the bond is ionic centrally located directly between the C and F closer to F because fluorine has a higher electronegativity than carbon
Answer:
closer to F because fluorine has a higher electronegativity than carbon
Explanation:
Electronegativity refers to the ability of an atom in a bonding situation to draw the shared electrons of the bond closer to itself.
Electronegativity increases across the period and decreases down the group. A highly electronegative atom draws the shared electron pair of a bond towards itself.
When two atoms are bonded together, the electron pair is always drawn closer to the atom that has a higher electronegativity.
Hence, the electron pair in a C-F bond could be considered closer to F because fluorine has a higher electronegativity than carbon.
The electron pair in C-F bond could be considered closer to F because fluorine has a higher electronegativity than carbon and the correct option is option D.
Electronegativity is a measure of an atom's tendency to attract electrons towards itself when participating in a chemical bond. It is a fundamental property of elements that helps in understanding the nature of chemical bonding and the polarity of molecules.
The electronegativity of an atom is determined by several factors, including the number of protons in its nucleus and the distance between the nucleus and the valence electrons. Generally, elements with higher electronegativity values have a stronger pull on shared electrons, creating an uneven distribution of electron density in a covalent bond.
Thus, the ideal selection is option D.
Learn more about Electronegativity, here:
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A student who is studying atomic reactions creates the following Venn diagram.
Circle 1: Reaction A
-Involves Reactions
-Happens outside atomic nucleus
-Releases relatively small amounts of energy
Circle 2: Reaction B
-Involves neutrons
-Happens inside atomic nucleus
-Releases relatively large amounts of energy
How should the student label each circle in this diagram?
A. reaction A: chemical; reaction B: nuclear
B. reaction A: nuclear; reaction B: chemical
C. reaction A: strong nuclear; reaction B: weak nuclear
D. reaction A: weak nuclear; reaction B: strong nuclear
A. reaction A: chemical; reaction B: nuclear
Answer:
Solution given:
as
Circle 2: Reaction B
-Involves neutrons
-Happens inside atomic nucleus
-Releases relatively large amounts of energy
It happens on normal chemical reaction.
Circle 2: Reaction B
-Involves neutrons
-Happens inside atomic nucleus
-Releases relatively large amounts of energy
It happens on nuclear reaction.
Answer:
A reaction A: chemical; reaction B: nuclear
Explanation:
edg 2021
The value of the equilibrium constant K depends on: I. the initial concentrations of the reactants. II. the initial concentrations of the products. III. the final concentrations of the reactants. IV. the final concentrations of the products.
Answer:
None of these
Explanation:
For a reaction;
aA + bB ------>cC + dD
The equilibrium constant K is given as;
K = [C]^c [D]^d/[A]^a [B]^b
The equilibrium constant neither depends on the concentrations of the reactants nor on that of the products.
Let us recall that at equilibrium, the concentrations of reactants and products remain largely constant. This implies that, concentration of species do not appreciably change at equilibrium because the rates of forward and reverse reactions are equal.
Hence, the equilibrium constant neither depends on the initial/final concentrations of the reactants nor on the initial/final concentrations of the products.
HELP ME ASAP PLEASE
I need the answers I’m in a hurry
Answer: First box----Hail
Second Box-------Snow
Thrid Box-------Sleet
Forth Box-----Rain
Hope that helped! :)
A balanced redox equation must have which of the following: I. The same number of each type of atom on both sides of the equation II. The total number electrons lost in the oxidation equal to total number of electrons gained in the reduction III. The same total charge of all ionic species on both sides of the reaction IV. H2O present as a product or a reactant
Answer:
The question is not complete as it lacks the options. The options are;
A) i,ii, and iii
B) i and ii
C) i,iii,and iv
D) i,ii,iii, and iv
E) iii and iv
The answer is A.
Explanation:
A redox reaction i.e. oxidation-reduction is a reaction in which a change in the oxidation number or state of the participating atoms occur. A redox reaction, as the name implies, contains the oxidation part and the reduction part.
Just like any other reaction, redox reaction needs to be balanced as well. A balanced redox reaction must have the following characteristics:
- The same number of each type of atom on both sides of the equation. For example, if there are 4 atoms of Carbon on the reactant side, there must be 4 atoms of C on product side.
- The total number electrons lost in the oxidation equal to total number of electrons gained in the reduction. For example, if 12 electrons are gained in the reduction part, 12 electrons must be lost in the oxidation part.
- The same total charge of all ionic species on both sides of the reaction.
In which layer is the temperature the lowest?
A. The lower mantle
B. The inner core
C. The crust
D. The outer core
Answer:
C
Explanation:
Answer:
the crust would be your answer
Explanation:
Hydrogen sulfide gas can be produced from the reaction of aluminum sulfide and water according to the following equation: Al2S3(s) 6H2O(l) ------> 3 H2S(g) 2Al(OH)3(aq) What volume of hydrogen sulfide gas is produced if 65.0 g Al2S3 reacts at 90.0 oC and 0.987 atm,
Answer: The volume of hydrogen sulfide gas is 38.8 L.
Explanation:
The given reaction equation is as follows.
[tex]Al_{2}S_{3}(s) + 6H_{2}O(l) \rightarrow 3H_{2}S(g) + 2Al(OH)_{3}(aq)[/tex]
Mass of [tex]Al_{2}S_{3}[/tex] is given as 65.0 g. Hence, moles of [tex]Al_{2}S_{3}[/tex] (molar mass = 150.158 g/mol) is calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{65.0 g}{150.158 g/mol}\\= 0.433 mol[/tex]
As 1 moles of [tex]Al_{2}S_{3}[/tex] is giving 3 moles of [tex]H_{2}S[/tex]. Hence, moles of [tex]H_{2}S[/tex] formed by 0.433 moles of [tex]Al_{2}S_{3}[/tex] are as follows.
[tex]Moles of H_{2}S = 0.433 mol \times \frac{3 mol H_{2}S}{1 mol Al_{2}S_{3}}\\= 1.299 mol[/tex]
Here, pressure is 0.987 atm and temperature is [tex](90 + 273) K = 368 K[/tex]. Therefore, volume of hydrogen sulfide is calculated 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 above formula as follows.
[tex]PV = nRT\\0.987 atm \times V = 1.299 mol \times 0.0821 L atm/mol K \times 368 K\\V = 38.8 L[/tex]
Thus, we can conclude that volume of hydrogen sulfide gas is 38.8 L.
Which best explains the relationship between evaporation and temperature?
• A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed
as easily from the liquid's surface.
O A liquid evaporates faster at lower temperatures becaus the attractions are decreased and more particles can
escape the surface of the liquid.
© A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, SO fewer
molecules can escape the surface.
• A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome
attractions in the liquid.
Answer: D
Explanation:
liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
What is the major organic product obtained from the reaction of (R)-2-bromohexane with sodium cyanide/acetone
Answer:
Option C
Explanation:
The complete question is
What is the major organic product obtained from the reaction of
(R)-2-bromohexane with sodium cyanide/acetone?
A) ) trans-2-pentene
B) ( S)-2-Methylpentanenitrile
C) ( S)-2-Methylhexanenitrile
D) (plus or minus)-2-Methylpentanenitrile
Solution
This is an inversion reaction in which (R) 2 Bromohexane convert into (S) -2 – methyl hexane in the presence of Acetone and NaCN.
The reaction occurs through the SN2 mechanism and there is inversion of confiruration
Hence, option C is correct
Part B
Explain what happened to make the water in the plastic bowl different from the water in the pot.
Answer:
I'd say the plastic particles in the bowl boiled off into the water to make the water cloudy and taste different. While the water boiled in the pot was clearer and tasted no different than regular water
Explanation:
I'm doing the course activity now.
Three solutions are mixed together to form a single solution; in the final solution, there are 0.2 mol Pb(CH3COO)2, 0.1 mol Na2S, and 0.1 mol LiCl present. find preciptate
Three solutions are mixed together to form a single solution. The precipitate in the solution is PbS and PbCl₂.
What are precipitates?Precipitates are the residues that are present in the solution. These residues are solid that came out of the solution.
Here given 3 compounds are water-soluble.
From the solution, we have to find the possible combination which is water-soluble.
Consider,
Pb(CH3COO)₂ Pb₂+(aq) + 2CH₃COO-(aq)
Na₂S₂Na+(aq) + S₂-(aq)
LiCl Li+(aq) + Cl-(aq)
Now consider a potential accumulation of positive and negative ions which is water-soluble.
The possible accumulations are,
PbS , PbCl₂
Ca(CH₃COO)₂ , CaS
Now viewing with solubility charge, we can find that both PbS and PbCl2 are water indissoluble and create a precipitate.
But both Ca(CH₃COO)₂ and CaS are water-soluble.
Therefore, the precipitates are PbS and PbCl₂.
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Calculate the percent composition of Ca3P2
Answer:
Ca - 66%, P - 34%
Explanation:
So, this is the formula we can use to find the amount of each element:
Element count * Atomic mass = Mass
Plug in our elements for this:
Ca - 3*40.078=120.234
P - 2*30.973=61.946
Now, to find the percentage of mass, we must find total mass, and divide the two elements mass count by this total mass:
120.234+61.946=182.18
Now divide each element mass by the total mass:
Ca - 120.234/182.18=0.6599(Round to 0.65)
P - 61.946/182.18=0.34002(Round to 0.34)
Then multiply both numbers by 100 to get the percentage:
Ca - 65%
P - 34%
So these our your two answer!
Hope this helps!
explain anation reaction
Answer:
In coordination chemistry, anation is the "replacement of the ligand water by an anion in a coordination entity." The term is however used more loosely to include displacement of any neutral ligand by an anion. The reverse reaction, displacement of an anionic ligand by water, is called aquation.
Explanation:
A 465 mL sample of gas at 55°C is cooled to standard temperature (0°C). What is its new volume?
Will mark brainliest INSTA
Explanation:
charles law
V1/T1=V2/T2
465/(273+55) =V2/273
V2=387mL
The free energy of ATP hydrolysis is used to maintain the concentration of Ca2 inside the cell to be constant. Calculate the number of moles of ATP required to pump out one mole of Ca2 when the cell is placed in a liquid culture containing 1 M CaCl2 at 25oC. The concentrations of ADP and Pi inside the cell are 250 mM and 10 mM, respectively, and that of ATP is 1.5 mM. The standard free energy of ATP hydrolysis at 25oC is O31.0kJ.
Answer:
The response can be defined as follows:
Explanation:
ATP is a hydrolysis energy-saving money of the cell. It is used to support the cell's endothermic processes.
[tex]ATP\ +\ H_{2}O\ \rightleftharpoons \ ADP\ +\ P_{i}\\\\Q\ = \ \frac{[ADP][P_{i}]}{[ATP][H_{2}O]}\\\\ADP= 0.250 \ M\\\\P_i = 0.010 \ M\\\\ATP = 0.150 \ M\\\\H_2O = 55.55 \ M\\\\\Delta G \ =\ \Delta G^{o}\ +\ 2.303\ RT\ \log\ Q\\\\R = 8.314 \frac{J}{mol\ K}\\\\T = 298\ K\\\\[/tex]
Help pls i really need help
Answer: I think it's 1
Explanation: Potential energy means stored energy . In Position 1 it's not moving the energy is being stored. Hope that helps.
How many moles are in 482 mL of a 1.91 M solution of NaBr?
Answer:
0.921 moles
Explanation:
1.91 M means 1.91 moles/liter
482 mL = 0.482 L
0.482 L × 1.91 moles/liter = 0.92062 moles