To produce superheated steam, the heat source must exceed 100°C, and the system must be sealed to allow pressure buildup. This increased pressure raises the boiling point, permitting the water to absorb more heat, making the steam superheated.
In high temperature boilers or steam engines, such as those found in steam locomotives or industrial reactors, to produce superheated steam, several conditions have to be met. One key factor is that the heat source must be greater than 100°C, as it's necessary to not just boil the water but also to add extra energy to the steam to make it superheated. Moreover, the system must allow the water to evaporate, but not quickly .
To produce super heated steam, a high-temperature boiler or steam engine must maintain a sealed and pressurized system above atmospheric pressure, which allows the boiling point to increase and produce steam at higher temperatures, such as in steam locomotives and pressurized reactors.
In the context of steam generation and boilers, several factors are key to producing super heated steam. Based on the information provided, the system must be sealed and become pressurized above atmospheric pressure, is correct.
Raising the pressure of the steam increases the boiling point of water, thus, a steam engine or a high-temperature boiler would need to have a sealed system to maintain the pressurization necessary to produce super heated steam. For instance, at a pressure of 150 pounds or more per square inch, which is common in locomotives, the water and steam's temperature can reach 360°C or higher.
This principle is analogous to the increased boiling point experienced in pressurized water reactors, where water can remain liquid at temperatures significantly above 100°C. When steam does work in an engine or a turbine, it condenses and loses some temperature. High efficiency is desirable for steam engines, and it's achieved through operating at higher temperatures and pressures, which increases the proportion of the heat units utilized for work.
Which of the following represent impossible combinations of n and I? (a) 1p, (b) 4s, (c) 5f, (d) 2d 6.61
Answer:
Options (a) and (d) : (a) 1p and (d) 2d represent impossible combinations of n and l.Explanation:
n refers to the principal quantum number, and l refers to the angular momentum or Azimuthal quantum number.
Principal quantum number (n) is used to indicate the main energy level of the electron. It may take whole numbers: 1, 2, 3, 4, 5, 6, 7, ...
Angular momentum or Azimuthal quantum number refers to the kind (shape) of the orbital. It can take numbers from 0 to n - 1.
So, if n = 1, l can only be 0; if n = 2, l can be either 0 or 1; if n = 2, l can be either 0, 1 or 2.
On the other hand, the shape of the orbitals is also representd by a letter. then there is a unique relation between the letter that represents the orbital and the angular quantum number which is:
letter l number
s 0
p 1
d 2
f 3
The previous information is summarized in the next table:
n possible l numbers
1 0
2 0, 1
3 0, 1, 2
4 0, 1, 2, 3
5 0, 1, 2, 3, 4
6 0, 1, 2, 3, 4, 5
7 0, 1, 2, 3, 4, 5, 6
As per the choices given in the question you have:
(a) 1 p is not possible because when n = 1 the only l number is 0 and it is an s orbital, but p ⇒ l = 1. Thus, this is a correct choice.
(b) 4s is possible since n = 4 permits l to be 0, 1, 2, and 3.
(c) 5f is possible since n = 5 permits l to be 0, 1, 2, 3, and 4.
(d) 2d is impossible since n = 2 permits l to be 0, and 1, but d ⇒ l = 2. Thus, this is other right choice.
The impossible combinations of n and I are 1p and 2d.
Quantum numbers describe the position of an electron in an atom. Four sets of quantum numbers are important when discussing electrons in atoms. These quantum numbers are;
Principal quantum number (n) taking values from 0 to infinityorbital quantum number(l) taking values from 0 to (n - 1)magnetic quantum number(ml) taking values from +l to -lSpin quantum number(ms) taking values of ±1/2.Given the conditions, combinations of n and I where n = l are not allowed. Recall that s p d f corresponds to 0 1 2 3. As such, 1p and 2d are not allowed.
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A sample of 1.55 g of iron ore is dissolved in an acid solution in which the iron is converted into
Fe2+. The solution formed is then titrated with KMnO4 which oxidises Fe2+ to Fe3+ while the MnO4-
ions are reduced to Mn2+ ions. 92.95 mL of 0.020 M KMnO4 is required for the titration to reach
the equivalence point.
a) Write the balanced equation for the titration.
b) Calculate the percentage of iron in the sample.
Answer:a) 8H2SO4 + 2KMnO4 + 10FeSO4 → 5Fe2(SO4)3 + 8H2O + 2MnSO4 + K2SO4
B) nKMno4 = 0.001859 mol
=>nFeso4=0.009295 mol
nFe= 0.009295 mol
mFe=0.52052 g
=>percentage of iron in the sample: 33.5819%
Explanation:a) 8H2SO4 + 2KMnO4 + 10FeSO4 → 5Fe2(SO4)3 + 8H2O + 2MnSO4 + K2SO4
B) nKMno4 = 0.001859 mol
=>nFeso4=0.009295 mol
nFe= 0.009295 mol
mFe=0.52052 g
The reaction is a redox reaction.
The percentage of Fe^2+ is 34.3%
The balanced overall redox reaction equation is:
[tex]MnO4^- + 8H^+ + 5Fe^2+ ----> Mn^2+ + 4H2O + 5Fe^3+[/tex]
Number of moles of permanganate = 0.020 M * 92.95/1000 L = 0.0019 moles
From the reaction equation:
5 moles of [tex]Fe^2+[/tex]reacts with 1 mole of permanganate
x moles of [tex]Fe^2+[/tex] reacts with 0.0019 moles of permanganate
x = 5 * 0.0019 /1 = 0.0095 moles of [tex]Fe^2+[/tex]
Mass of [tex]Fe^2+[/tex] = 0.0095 moles of [tex]Fe^2+[/tex] * 56 g/mol = 0.532 g
Percentage of iron = 0.532 g/1.55 g * 100 = 34.3%
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Which is the electron configuration for boron?
Answer: The electronic configuration is given below.
Explanation:
Electronic configuration tells us about the number of electrons that are present in an atom. It also determines the atomic number of an element.
Boron is the 5th element of the periodic table having 5 electrons.
The electronic configuration for the given element = [tex]1s^22s^22p^1[/tex]
This element has 3 valence electrons.
Thus, the electronic configuration is given above.
What is the atomic number of an atom that has 6 protons
Answer:
Its atomic mass is 14 ( = 6 protons + 8 neutrons). In chemistry, the number of protons in an atom is more important than the number of neutrons. Scientists call the number of protons the "atomic number"
Explanation:
Bromine occurs in the ____ state at room temperature.
a
gaseous
b
halogen
c
solid
d
liquid
e
plasma
Answer:
d liquid
Explanation:
Bromine occurs in the liquid state at room temperature.
Bromine is the only nonmetallic element that occurs in the liquid state at room temperature.
What is the pH of a 0.0010 M HNO3?
1.0
3.0
4.0
5.0
Answer:
Ph= 3
Explanation:
-Log(0.0010)=3
What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?
Answer: The mass of intravenous glucose solution is 2300 g
Explanation:
To calculate the mass of solution, we use the equation:
[tex]\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}[/tex]
Volume of glucose solution = 2.00 L = 2000 mL (Conversion factor: 1 L = 1000 mL)
Density of glucose solution = 1.15 g/mL
Putting values in above equation, we get:
[tex]1.15g/mL=\frac{\text{Mass of glucose solution}}{2000mL}\\\\\text{Mass of glucose solution}=2300g[/tex]
Hence, the mass of intravenous glucose solution is 2300 g
An example of something that stores chemical energy is
Hello There!
Chemical energy is energy that is stored in the bonds and atoms of molecules.
A battery is an example of an item that stores atoms and molecules in the bonds.
Gasoline and organic molecules like sugars and fats are examples of things that store chemical energy. This energy can be transformed during combustion in cars or through metabolic processes in living cells into usable forms of kinetic or ATP energy.
Explanation:An example of something that stores chemical energy is gasoline, which stores energy in the bonds of its molecules. This chemical energy is released as heat during combustion in a car engine, converging into kinetic (mechanical) energy that moves the car.
Another scenario is found within our bodies. Organic molecules such as sugars and fats also store chemical energy. Your cells evolve to convert this chemical energy through a series of chemical reactions into a usable form of energy stored in molecules of ATP (Adenosine Triphosphate), an energy-carrying molecule found in the cells of all living things. This energy is easily accessible to do work such as muscle contraction, transport materials, power the motion of cilia or flagella, etc.
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In a chemical reaction, the final amount of the products is determined by the _______.
A. Universal Gas Law
B. Law of Definite Proportions
C. air pressure
D. temperature
E. None of the Above
Please help me
Answer: I believe it is B
Explanation:
because it states that a chemical compound always contains exactly the same proportion of elements by mass
The nuclide As-76 has a half-life of 26.0 hours. If a sample of As-76 weighs 344 g, what mass of As-76 remains after 538 minutes? A) 67.8 g B) 271 g C) 144 g D) 437 g E) 251 g 26.
Answer:
B) 271 g.
Explanation:
It is known that the decay of a radioactive isotope isotope obeys first order kinetics.Half-life time is the time needed for the reactants to be in its half concentration.If reactant has initial concentration [A₀], after half-life time its concentration will be ([A₀]/2).Also, it is clear that in first order decay the half-life time is independent of the initial concentration.The half-life of As-76 = 26.0 hours.For, first order reactions:
k = ln(2)/(t1/2) = 0.693/(t1/2).
Where, k is the rate constant of the reaction.
t1/2 is the half-life of the reaction.
∴ k =0.693/(t1/2) = 0.693/(26.0 hours) = 0.02665 hour⁻¹.
Also, we have the integral law of first order reaction:kt = ln([A₀]/[A]),
where, k is the rate constant of the reaction (k = 0.02665 hour⁻¹).
t is the time of the reaction (t = 538 min = 8.97 hour).
[A₀] is the initial concentration of (As-76) ([A₀] = 344 g).
[A] is the remaining concentration of (As-76) ([A] = ??? g).
∴ (0.02665 hour⁻¹)(8.97 hour) = ln((344 g)/[A])
∴ 0.239 = ln((344 g)/[A]).
Taking exponential for both sides:∴ 1.27 = ((344 g)/[A]).
∴ [A] = (344 g)/(1.27) = 270.88 g ≅ 271 g.
So, the right choice is: B) 271 g.What type of organic molecule comprises the majority of a potato?
Many batteries cannot be recharged by electrolysis because they would explode.
a. True
b. False
I think the answer is true, I need a second opinion.
Answer:
True.
Explanation:
A non-rechargeable battery, which is also called a primary cell, is known to overheat and some even explode when placed in a charger. This can occur due to the toxic chemicals that might seep out when the battery is heated.
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Which of the following variables is not considered to be a fundamental way of changing the rate of a chemical reaction?
a. Temperature
b. Surface Area
c. Concentration
d. Catalyst
e. Time
Quite certain the answer is Time but I need a second opinion.
Answer:
Yeah, same i believe it's Time.
Explanation:
Hope my answer has helped you!
Answer:
e. Time
Explanation:
That is correct.. All the others may be active in affecting the rate of a reaction.
Gallium has two naturally occurring isotopes. One of them, gallium-69, has a mass of 68.925581 u and a percent isotopic abundance of 60.11%. What must be the mass and percent isotopic abundance of the other isotope, gallium-71?
Answer:
1) The percent isotopic abundance of Ga-71 = 39.89%.
2) The mass of Ga-71 = 70.294625 u.
Explanation:
1) The percent isotopic abundance of Ga-71:
The total sum of different isotopes = 100%.
∴ The abundance percent of Ga-69 + the abundance percent of Ga-71 = 100%.
∴ The abundance percent of Ga-71 = 100% - The abundance percent of Ga-69 = 100% - 60. 11% = 39.89%.
2) The mass of Ga-71:
∵ The amu of the mixture = (amu of Ga-69)(fraction of isotope Ga-69) + (amu of Ga-71)(fraction of isotope Ga-71).
The amu of the mixture = 69.723 u,
amu of Ga-69 = 68.925581 u, fraction of isotope Ga-69 = (abundance of Ga-69)/100 = (60.11%)/100 = 0.6011,
amu of Ga-71 = ??? u, fraction of isotope Ga-71= (abundance of Ga-69)/100 = (39.89%)/100 = 0.3989.
∴ 69.723 u = (68.925581 u)(0.6011) + (amu of Ga-71)(0.3989).
∴ (amu of Ga-71)(0.3989) = (69.723 u)(68.925581 u)(0.6011) = 28.29 u.
∴ (amu of Ga-71) = (28.29 u)/(0.3989) = 70.294625 u.
Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and K_f is equal to 1.86 C/m
Answer:
108.43 g.
Explanation:
Adding solute (KNO₃) to water causes depression of freezing point of water (collegative properties).We can predict the change in the freezing point (ΔTf) of water using the relation:ΔTf = i.Kf.m,
where, ΔTf is the elevation in boiling water (ΔTf = 0.0°C - (- 14.5°C) = 14.5 °C).
i is van 't Hoff factor, The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.
i for KNO₃ = 2/1 = 2.
Kf is the molal freezing constant of water (Kf = 1.86 °C/m).
m is the molality of the solution.
∵ ΔTf = i.Kf.m,
∴ m = (ΔTf)/(i.Kf) = (14.5°C)/(2)(1.86 °C/m) = 3.9 m.
molality (m) is the no. of moles of solute dissolved in 1.0 kg of solvent.m = (no. of moles of KNO₃)/(mass of water (kg)) = (mass/molar mass of KNO₃)/(mass of water (kg)).
∴ 3.9 m = (mass of KNO₃ / 101.1 g/mol)/(0.275 kg).
∴ mass of KNO₃ = (3.9 m)(101.1 g/mol)(0.275 kg) = 108.43 g.
To create a solution that freezes at -14.5 °C, calculate the required molality using the freezing point depression formula, adjust for the dissociation of KNO3 into 2 ions, and then use this to find the moles and mass of KNO3 needed. In this case, 108.35 grams of KNO3 must be added to 275 mL of water.
Explanation:To determine how many grams of KNO3 must be added to produce a solution that freezes at -14.5 °C, we use the freezing-point depression formula: ΔTf = Kf x m, where ΔTf is the freezing point depression, Kf is the freezing point depression constant (1.86 °C/m for water), and m is the molality. First, we calculate the molality needed for the desired freezing point depression:
ΔTf = -14.5 °C (because the freezing point is 14.5 °C below that of pure water)
Kf = 1.86 °C/m
So, m = ΔTf / Kf = -14.5 °C / 1.86 °C/m = -7.795 m
Since KNO3 dissociates into K+ and NO3−, each mole of KNO3 will produce 2 moles of ions. For KNO3, the van't Hoff factor (i) is 2. The molality (m) considering dissociation will now be half the earlier calculated value due to the doubling of particles when dissociation occurs:
m = -7.795 m / 2 = -3.8975 m
The molality is negative because freezing point depression is a negative value. But for the purpose of calculations, we use the positive value of 3.8975 m. We use the formula molality (m) = moles of solute / kilograms of solvent to find the moles of KNO3 needed;
0.275 kg water (275 mL of water converted to kg) x 3.8975 m = moles of KNO3
Moles of KNO3 = 1.0715 mol (after calculation)
Finally, to find the mass of KNO3, multiply the moles by the molar mass (101.1 g/mol for KNO3):
Mass = 1.0715 mol x 101.1 g/mol = 108.35 g (rounded to two decimal places)
Therefore, 108.35 grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 °C.
PLEASE HELP THANKS
A student performs an exothermic reaction in a beaker and measures the temperature. If the thermometer initially reads 35 degrees Celsius, what is a possible reading of the thermometer after the reaction?
A. 45 degrees Celsius B. 0 degrees Celsius C. 35 degrees Celsius D. 25 degrees Celsius
Answer:
i think 35 degrees Celsius
Explanation:
cause its the same temperature
Answer:
The answer is: A. 45 degrees Celsius
Explanation:
Answer:
In order to solve this problem, you need to know that an exothermic reaction is a chemical reaction that releases energy through light or heat to the environment, in the other hand, an endothermic reaction is a chemical reaction that absorbs heat from its environment.
In the problem says that an exothermic reaction is performed at a temperature of 35 degrees Celsius.
Now, keeping in mind that a exothermic reaction release heat, we can affirm that the temperature of the sistem will by increased after the reaction occurs.
Finally, the only possible answer is A, because is the only temperature which is superior to the initial temperature (35 degrees Celsius)
When solutions of silver nitrate and magnesium chloride are mixed, silver chloride precipitates out of solution according to the equation 2AgNO3(aq)+MgCl2(aq)→2AgCl(s)+Mg(NO3)2(aq) What mass of silver chloride can be produced from 1.50 L of a 0.118 M solution of silver nitrate?
Find the enthalpy of neutralization of HCl and NaOH. 87 cm3 of 1.6 mol dm-3 hydrochloric acid was neutralized by 87 cm3 of 1.6 mol dm-3 NaOH. The temperature rose from 298 K to 317.4 K. The specific heat capacity is the same as water, 4.18 J/K g.
A. -101.37 kJ
B. 7055 kJ
C. 10,1365 kJ
Answer:
The correct answer is A : -101.37 KJ
Explanation:
Specific heat, s = 4.18 J/Kg
Density of water is 1g/cm3 , so 174 cm3 of total solution is = 174 g
Total mass of reaction mixture is = 174 g
Rise in tempetrature, ΔT = 317.4 K -298 K = 19.4 K
87 cm3 of 1.6 mol dm-3 of HCl = 87 cm3 of 1.6 mol dm-3 NaOH
1.6 M solution means that 1000 cm3 of solution has 1.6 moles.
So, 87 cm3 of 1.6 M solutions = 0.1392 M of HCl and NaOH
Heat evolved (q) = m x s x ΔT
= 174 g x 4.18 J/Kg X 19.4 K
=14110.0 J = 14.110 KJ (for exothermirmic reaction -14.110 KJ )
Enthalpy of neutralization = -14.110 KJ/ 0.1392 = - 101.37 KJ
Answer:
A.) -101.37 kJ
Explanation:
I got it correct on founders edtell
Two containers hold the same radioactive isotope. Container A contains 1000 atoms, and container B contains 500 atoms. Which of the following statements about containers A and B is true? Two containers hold the same radioactive isotope. Container A contains 1000 atoms, and container B contains 500 atoms. Which of the following statements about containers A and B is true? The rate of decay of atoms (half-life) in container A is greater (or longer) than the rate of decay of atoms (half-life) in container B. The rate of decay of atoms (half-life) in container B is greater (or longer) than the rate of decay of atoms (half-life) in container A. The rate of decay of atoms (half-life) in container B is the same as the rate of decay of atoms (half-life) in container A.
Answer:
B
Explanation:
This is due to the differences in the concentrations of the radioactive isotopes in the two containers of the same volume. In container A, with a higher density of atoms, there is a higher chance of a neutron released in the decay of one atom, hitting another atom and splitting it. This is in comparison to container B that has fewer atoms that are widely dispersed due to the lower density. Atoms in cointainer A will therefore decay faster (shorter half-life) than atoms in container B.
Answer:
b
Explanation:
Element before carbon on the periodic table
Answer:Boron
Explanation:
it is element 5 represented by the letter B
Answer:
Boron.
Explanation:
Boron is fifth in the periodic table, and carbon is sixth. It goes: hydrogen, helium, lithium, beryllium, boron, carbon...
On the atomic level energy and matter exhibit the characteristics of
Answer:
On the atomic level, energy and matter exhibit the characteristics of both waves and particles.Explanation:
The dual behavior of subatomic particles as waves and particles is known as the wave - particle duality.
And this principle is the basis of the quantum theory.
Such principle is widely applied to the electrons; i.e., the electrons posses wave and particle propeties, which must be understodd as that some of their properties may be explained as if they were particles and others as if they were waves.
For example, from the particle point of view electrons have mass. You can find in internet that the mass of one electron is about 9.1093837015×10⁻³¹ kg or about 1/1836 times the mass of one proton.)
Since, the point of view of the wave characteristics, electrons have wavelength, Louis de Broglie deduced the equation that relates the wavelength and the mass, through this realtion:
Wavelength (λ) = Planck’s constant (h) divided by the product of the mass (m) and the the speed (v) of the particle.λ = h / mv
Melting can be best described as a process in which molecules?
a)lose kinetic energy and move slowly.
b)lose kinetic energy and remain stationary. c)gain kinetic energy and escape into the atmosphere.
d)gain enough kinetic energy to get past each other.
Answer:
D.gain enough kinetic energy to get past each other.
Explanation:
Melting can be best described as a process in which molecules gain enough kenetic energy to put past each other.
Answer:
D
Explanation:
Edge 2020
How does the pressure exerted by a liquid change with depth of the liquid? How does the pressure exerted by a liquid change as the density of the liquid changes?
proportional to depth; constant as density changes
proportional to depth; proportional to density
proportional to depth; inversely proportional to density
inversely proportional to depth; proportional to density
Answer:
second option: proportional to depth; proportional to densityExplanation:
The pressure exerted by a liquid is equal to the pressure inside the liquid. This pressure is called hydrostatic pressure.
The equation to calculate the pressure inside a liquid (a fluid in general) is found by applying balance of forces inside a portion of liquid.
The equilibrium condition (net force = 0) and the definition of pressure (P = F/A) leads to:
P = p⁰ + ρ . g . Δh, or ΔP = ρ . g . ΔhWhere, P is the pressure exerted by the liquid, p⁰ is the atmospheric pressure, ΔP is the difference in the pressure, ρ is the density of the liquid, g is the acceleration of gravity, and Δh is the change with depth.
Hence, the pressure exerted by a liquid varies jointly with the density of the liquid and the depth, meaning that it is proportional to the product of them both.
Therefore, the choice that represents this conditon is the second one: the pressure exerted by a liquid changes proportional to the depth and proportional to the density changes.
The pressure exerted by a liquid is proportional to the depth of the liquid and also proportional to the density of the liquid.
Explanation:The pressure exerted by a liquid changes with depth and density in a predictable way. As you go deeper into a liquid, the pressure increases because there is more liquid above you exerting force due to gravity. This relationship is proportional to depth; specifically, pressure due to the weight of a liquid of constant density is given by the formula p = ρ gh, where p is the pressure, h is the depth of the liquid, ρ (rho) is the density of the liquid, and g is the acceleration due to gravity.
Similarly, the pressure exerted by a liquid also changes as the density of the liquid changes. If the density of the liquid increases, the pressure at a particular depth also increases. Thus, this relationship is proportional to density. Traveling up into the atmosphere demonstrates the effect density has on pressure because the density of the air begins to decrease with height, unlike in liquids where the density is often constant.
In summary, the pressure exerted by a liquid is proportional to both the depth and the density of the liquid. Therefore, the correct description of how pressure changes in a liquid is: proportional to depth; proportional to density.
which substance would cantain the most energetic molicules at room temp
a. solid aluminum
b. liquid mercury
c. hydrogen gas
d. its impossible to determine the answer
How many moles are equivalent to 3.58x1023 formula units of ZnCl2? a. 0.555 mol ZnCl2 c. 0.621 mol ZnCl2 b. 1 mol ZnCl2 d. 0.595 mol ZnCl2
Answer:
There are approximately d. 0.595 mol of ZnCl₂ in 3.58×10²³ formula units.
Explanation:
Consider the Avogadro's Constant [tex]N_A[/tex] or equivalently, [tex]L[/tex]:
[tex]N_A \approx \rm 6.02\times 10^{23}\;mol^{-1}[/tex].
In other words, there are [tex]\rm 6.02\times 10^{23}\;mol^{-1}[/tex] constituent particles (Wikipedia) in each mole of a substance. In this case,
Zinc chloride [tex]\rm ZnCl_2[/tex] is the substance, and[tex]\rm ZnCl_2[/tex] formula units are the constituents.[tex]N = 3.58\times 10^{23}[/tex].
[tex]\displaystyle n = \frac{N}{N_A} =\rm \frac{3.58\times 10^{23}}{6.02\times 10^{23}\;mol^{-1}} = 0.595\;mol[/tex].
calculate the speed of an electron if its de broglie wavelength is twice its displacement in one second
Answer:
The speed of an electron is 0.01908 m/s.
Explanation:
De-Broglie wavelength is given by:
[tex]\lambda=\frac{h}{mv}[/tex]
where, [tex]\lambda[/tex] = wavelength of a particle
h = Planck's constant = [tex]6.626\times 10^{-34}Js[/tex]
m = mass of particle
v = velocity of the particle
Velocity of an electron = v
Mass of an electron = [tex]9.1\times 10^{-31}kg[/tex]
Wavelength of electron is twice the displacement in seconds which is velocity of an electron.
Then.wavelength of an electron = [tex]\lambda =2v[/tex]
[tex]\lambda =2v=\frac{6.626\times 10^{-34}Js}{9.1\times 10^{-31}kg\times v}[/tex]
v = 0.01908 m/s
The speed of an electron is 0.01908 m/s.
In quantum physics, the de Broglie wavelength exhibits the wave-particle duality of matter, presenting that particles like electrons have wave characteristics. If an electron's de Broglie wavelength is twice its displacement per second, it suggests the electron's velocity equals the de Broglie wavelength divided by twice the time.
Explanation:The subject of the question pertains to de Broglie wavelength which is a fundamental concept in quantum physics. The de Broglie wavelength is named after Louis de Broglie and it describes the wave-particle duality of matter, suggesting that particles such as electrons have characteristics of both particles and waves.
If the de Broglie wavelength of an electron is twice its displacement in one second, this implies that the electron's velocity, is equal to the de Broglie wavelength of the electron divided by double the time (which is 1 second in this case).
It is important to understand that the de Broglie wavelength is not a physical wavelength but rather a mathematical construct that helps us understand the behavior of particles in a more intuitive way than through purely using the equations of quantum mechanics.
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Which of the following is in the lanthanide family?
A) Uranium
B) Promethium
C) Silver
D) Gold
Answer:
It is Promethium
Explanation:
Because they are chemical elements with atomic numbers 57 through 71
Answer:
The answer is B) Promethium
Explanation:
The Promethium is a chemical element of the periodic table whose symbol is Pm and its atomic number is 61 and is part of the group of lanthanide elements.
Lanthanides are a group of elements that are part of period 6 of the periodic table of the elements whose name comes from the chemical element lanthanum, which is included within this group, giving a total of 15 elements, from the element of atomic number 57 (lanthanum) to 71 (lutetium)
when 0.863 mol acetone is dissolved in 500 g benzene, the freezing point of benzene drops 8.84°C. what is the molal freezing point depression constant (kf) for benzene?
Answer:
Kf = 5.12 °C/mExplanation:
1) Data:
a) Solute: acetone
b) Solvent: benzene
c) n (solute) = 0.863 mol
d) mass of solvent = 500 g = 0.500 Kg
e) ΔTf = 8.84 °C
f) Kf = ?
2) Formulae:
Depression of freezing point: ΔTf = m . KfMolality: m = n (solute) / kg solvent3) Solution:
a) m = 0.863 mol / 0.500 kg = 1.726 m
b) Kf = ΔTf / m = 8.84°C / 1.726 m = 5.12 °C/m ← answer
Which of these describes the rate of this chemical reaction?
H2 + Cl2 → 2 HCl
a. an increase in the concentration of HCl and H2 with time
b. an increase in the concentration of HCl with time
c. an increase in H2 and Cl2 with time
d. a decrease in HCl and Cl2 with time
Answer:
b.an increase in concentration of HCl with time.
Explanation:
The measurement of reaction rate is simply based on the dissapearance of a reactant or appearance of a product with increasing reaction time.
For this kind of chemical reaction, the rate would increase if the concentration of the reactants increase.
The reactants are made up of gaseous particles, for gases reacting, the rate of the reaction is directly proportional to concentration. The concentration of a gaseous system is also directly proportional to the pressure and we can use pressure in place of concentration.
For this reaction, we don't know the order of reaction of the reactants. This would not make the gaseous reactants suitable to monitor the rate of the reaction.
Since it is only the appearance of the product we are sure of, we simply monitor the concentration of the product to determine the rate.
The correct answer is option b) an increase in the concentration of HCl with time. The rate of the reaction [tex]H_2 + Cl_2 \rightarrow 2HCl[/tex] as HCl is the product and its concentration increases over time.
The reaction given is [tex]H_2 + Cl_2 \rightarrow 2HCl[/tex].
We need to determine which option correctly describes the rate of this reaction. Considering the options:
An increase in the concentration of HCl and H₂ with time.
This option is incorrect because H₂ is a reactant and its concentration should decrease over time.An increase in the concentration of HCl with time.
This option is correct as HCl is the product, and its concentration will increase over time as the reaction proceeds.An increase in H₂ and Cl₂ with time.
This option is incorrect because both H2 and Cl2 are reactants and their concentrations should decrease over time.A decrease in HCl and Cl₂ with time.
This option is incorrect because HCl is the product, and its concentration should increase.Therefore, the correct answer is option b.
Which of the following is true about a carbonated soft drink?. . The carbon dioxide is the solvent, and water is the solute.. . The water is the solution, and carbon dioxide is the solvent.. . The carbon dioxide is the solution, and the water is the solvent.. . The water is the solvent, and the carbon dioxide is the solute.. . .
Answer:
The water is the solvent and the Carbon Dioxide is the Solute
Explanation:
The Carbon Dioxide is being dissolved into the Water. Solute is what is being dissolved, Solvent is what is doing the dissolving