E= hf
so shorter lambda = larger f= more energy
Answer is A
The wavelength of an EM wave related to its energy as "The shorter the wavelength of a wave, the higher its energy".
What are Electromagnetic radiations?Electromagnetic radiation is a type of energy that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma-rays. Sunlight is also a form of electromagnetic energy, but visible light is only a small portion of the electromagnetic spectrum, which contains a broad range of wavelengths.
In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves. In order from highest to lowest wavelength, the series is just opposite.
Electromagnetic radiations don't require any medium to travel and also travel in speed of light. They have Electric field vector and magnetic field vector that is perpendicular to each other and also are perpendicular to the direction of propagation.
Therefore, the wavelength of an EM wave related to its energy as "The shorter the wavelength of a wave, the higher its energy".
Learn more about EM wave, here:
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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:
How is the molar mass of a molecule determined? What are its units?
Answer:
Explanation:
molar mass=valency of the element*atomic number
its unit is amu
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
PLZ HELP ASAP!!!
What is the percent by mass of CaCl2, when 35 grams are dissolved in enough water to produce 3 kg of solution?
A) 12%
B) 8.6%
C) 86%
D) 1.2%
Answer:
A) 1.2%
Explanation:
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
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.
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST ANY ANSWERS WOULD BE GREATLY APPRECIATED :) chemical reaction will stop when the limiting reactant is used up.Question 1 options:
True
False
I believe that this statement is true
Fill the missing blank
i’m generally confused about this so if anyone could help me it would mean a lot!!!!
Answer:
The answers to your questions are given below.
Explanation:
1. The symbol of Zinc is Zn
2. Determination of the proton number
Atomic number is simply defined as the number of protons in the nucleus of an atom. Mathematically, it is expressed:
Atomic number = proton number
Atomic number = 30
Therefore,
Proton number = 30
3. Determination of the neutron number
Mass Number = 65
Proton number = 30
Neutron number =?
Mass number = Proton + Neutron
65 = 30 + Neutron
Collect like terms
65 – 30 = Neutron
35 = Neutron
Thus,
Neutron number = 35
4. Determination of the electron number
Since the element is in it's ground state (i.e it has no charge), thus, the number of protons of the element is the same as number of electrons i.e
Electron number = proton number
Proton number = 30
Thus,
Electron number = 30
What’s a chemical property
Answer:
A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.
Fassst. A or b or c or d plzzz
Answer:
C
Explanation:
Kepler first law means that planets mover around the sun in a elliptical motion
Help.
Work needs to be shown
show equations and how you did it
Answer:
436.8 mmHg.
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 0.93 atm
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Next, we shall convert the total pressure to mmHg . This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
0.93 atm = 0.93 × 760 mmHg / 1 atm
0.93 atm = 706.8 mmHg
Finally, we shall determine the pressure of the O₂. This can be obtained as follow:
Total pressure (Pₜ) = 706.8 mmHg
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Pₜ = Pₙ₂ + Pₒ₂
706.8 = 270 + Pₒ₂
Collect like terms
706.8 – 270 = Pₒ₂
436.8 = Pₒ₂
Pₒ₂ = 436.8 mmHg
Thus, the pressure of O₂ is 436.8 mmHg
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.
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:
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.
D D 8. (06.02 LC)
A heating curve has two flat lines, or plateaus. What does the plateau at the lower temperature represent? (5 poin
A. Boiling of a liquid
B. Melting of a solid
C. Increase in temperature of a substance
D. Decrease in temperature of a substance
Answer:
Boiling of a liquid
The plateau at the lower temperature represents option A. Boiling of a liquid.
Representation of the plateau at the lower temperature:At the time when the heating curve should have two flat line or the plateaus so here the lower temperature shows the boiling of the liquid.
As the first plateau shows the melting and the second plateau shows the boiling.
hence, the option a is correct.
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True or false: A skeleton equation in chemistry shows the relative amounts of all materials in the reaction
Answer:
false im pretty sure.
What would you expect to be the electron-group arrangement around atom A in the following case? Give the ideal bond angles and the direction of any expected deviation.
Answer:
The answer is "Tetrahedral".
Explanation:
The carbon atom of approximately [tex]109.5^{\circ}[/tex] with four attachments. Its general form is one of a tetrahedron: a polyhedron consisting of 4 triangular sides, six straight edges, and four vertex corners from all faces equilateral triangles. The triangular pyramid is often referred to as the triangular pyramid.
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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why does a plant have a cell wall and a cell membrane?
ASAP Pls have to turn it in at 11:00pm
Answer:
The cell wall surrounds the plasma membrane and provides the cell tensile strength and protection. ... The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress.
hope It Helps U
Please Mark me As brainlist
ik most of it but my brain is not functioning rn
Answer:
A. Infiltration
B. Ground water discharge
C. Water storage in the ocean
D. Evaporation
E. Condensation
F. Precipitation
G. Runoff
im not sure about A-C
hope this helps
have a good day :)
Explanation:
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]
For the reaction Cu2S(s)⇌2Cu+(aq)+S2−(aq)Cu2S(s)⇌2Cu+(aq)+S2−(aq), the equilibrium concentrations are as follows: [Cu+]=1.0×10−5[Cu+]=1.0×10−5 M, [S2−]=1.0×10−2[S2−]=1.0×10−2 M. The equilibrium constant is:
Answer:
1x10⁻¹²
Explanation:
Cu₂S(s) ⇌ 2Cu⁺(aq) + S²⁻(aq)At equilibrium:
[Cu⁺] = 1.0x10⁻⁵ M[S²⁻] = 1.0x10⁻² MThe equilibrium constant for the the reaction can be written as:
Keq = [Cu⁺]² * [S²⁻][Cu⁺] is squared because it has a stoichiometric coefficient of 2 in the reaction. Cu₂S has no effect on the constant because it is a solid.
Now we can calculate the equilibrium constant:
Keq = (1.0x10⁻⁵)² * 1.0x10⁻² = 1x10⁻¹²Use 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
How many moles of NH3 are produced when 0.45 moles of H2 gas react
with N2 gas? N2 + 3H2 -->2 NH3 (mole to mole conversion)
Answer:
[tex]\boxed {\boxed {\sf 0.3 \ mol \ NH_3}}[/tex]
Explanation:
We need to use stiochiometry and a mole to mole conversion to solve this problem.
First, examine the chemical equation. Make sure it is balanced before doing any calculations.
[tex]N_2+3H_2 \rightarrow 2NH_3[/tex]
It is balanced, so we can also use the coefficients to refer to molar amounts.
So, the equation is also saying that 1 mole of N₂ (no coefficient implies 1) and 3 moles of H₂ react to form 2 moles of NH₃.
[tex]1 \ mol \ N_2 + 3 \ mol \ H_2 \rightarrow 2 \ mol \ NH_3[/tex]
Now we can use this information to make a ratio. We know that we have 0.45 moles of hydrogen, and we are trying to find the moles of ammonia.
According to the original equation, 3 moles of hydrogen produce 2 moles of ammonia. Let's make a ratio.
[tex]\frac {3 \ mol \ H_2}{2 \ mol \ NH_3}[/tex]
We have 0.45 moles of hydrogen, so multiply by that number.
[tex]0.45 \ mol \ H_2 *\frac {3 \ mol \ H_2}{2 \ mol \ NH_3}[/tex]
Flip the ratio so the units of moles of hydrogen cancel.
[tex]0.45 \ mol \ H_2 *\frac{2 \ mol \ NH_3 }{3 \ mol \ H_2}[/tex]
[tex]0.45 *\frac{2 \ mol \ NH_3 }{3}[/tex]
[tex]\frac {0.45 *2 \ }{3} mol \ NH_3[/tex]
[tex]\frac {0.9 \ }{3} mol \ NH_3[/tex]
[tex]0.3 \ mol \ NH_3[/tex]
0.3 moles of ammonia are produced when 0.45 moles of hydrogen gas react with nitrogen gas.
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
2.50 g of CO2 gas is confined in a rigid cylinder at a pressure of 4.65 atm. If 0.42 g of gas is released from the cylinder, what is the new pressure?
Answer:
5.59atm
Explanation:
boyles law
P1V1=P2V2
4.65×2.5=P2×(2.5-0.42)
11.625=P2×2.08
P2=5.59atm
Question 7 of 25
The study of rocks and minerals is part of which branch of science?
A. Computer science®
B. Physical science
C. Life science
D. Earth science
SUBNIT
Answer:
D
Explanation:
it does not fit in with any other science
A voltaic cell consists of an Mn/Mn2 half-cell and a Pb/Pb2 half-cell. Calculate [Pb2 ] when [Mn2 ] is 1.1 M and E cell is 0.44 V.
Answer:
[Pb²⁺] = 2.31x10⁻²¹ M
Explanation:
Let's write the semi reaction for each half cell:
Pb²⁺ + 2e⁻ -----------> Pb(s) E° = -0.13 V
Mn²⁺ + 2e⁻ ----------> Mn(s) E° = -1.18 V
As we can see, the E° of Pb is higher than the E° of the Mn, thus, Pb is reducting and Mn is oxidizing:
Pb²⁺ + 2e⁻ -----------> Pb(s) E°₁ = -0.13 V
Mn(s) ---------> Mn²⁺ + 2e⁻ E°₂ = +1.18 V
E° = E°₁ + E°₂
E° = -0.13 + 1.18 = 1.05 V
Now, we can use the Nerst equation which is:
E = E° - 0.059/n log([Mn²⁺] / [[Pb²⁺])
From here, we just need to replace and then, solve for the [Pb²⁺]:
0.44 = 1.05 - 0.059/2 log(1.1 / x)
0.44 - 1.05 = -0.0295 log(1.1 / x)
-0.61 / -0.0295 = log(1.1 / x)
antlog(20.678) = 1.1 /x
x = [Pb²⁺] = 1.1 / 4.76x10²⁰
[Pb²⁺] = 2.31x10⁻²¹ MHope this helps
Molecular distances are given in picometers, where 1 pm is equivalent to 1 x 10-12 meter.If the distance between carbon atoms in a diamond is 1.54 x 10-8 cm, what is this distance in picometers
Answer:
Distance = 154 pm
Explanation:
Given that,
The distance between carbon atoms in diamond is [tex]1.54\times 10^{-8}\ cm[/tex]
We need to find the distance in pm.
We know that,
[tex]1\ pm=10^{-12}\ m[/tex]
[tex]1.54\times 10^{-8}\ cm=1.54\times 10^{-8}\times 10^{-2}\ m\\\\=1.54\times 10^{-10}\ m[/tex]
Multiplying and dividing by 10⁻².
[tex]d=1.54\times 10^{-10}\times \dfrac{10^{-2}}{10^{-2}}\\\\=154\times 10^{-12}\ m\\\\=154\ pm[/tex]
So, the distance is 154 pm.
Name the functional group in the
following molecule:
HÖCH2CH2CH3
A, ketone
B, aldehyde
C. ester
D, alcohol
Answer:
aldehyde
Explanation: