The energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
Using Planck's equation, the energy of the photon E = hf where h = Planck's constant = 6.63 × 10⁻³⁴ Js and f = frequency of ultraviolet light = 2.47 × 10⁻¹⁵ Hz.
Substituting the values of the variables into the equation, we have
E = hf
E = 6.63 × 10⁻³⁴ Js × 2.47 × 10¹⁵ Hz.
E = 16.3761 × 10⁻¹⁹ J
E = 1.63761 × 10⁻¹⁸ J
E ≅ 1.638 × 10⁻¹⁸ J
So, the energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
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One of the following is not a property of metals
а
high malleability
ь
high compressibility
с
high melting point
d
high ductility
Answer:
option b
Explanation:
high compressibility is not a property of metal.
how many moles of oxygen are in 20 grams of oxygen
Answer:
0.625
Explanation:
If you are referring the O2, first you need to get the relative mass of it. You can see the O's is around 16. but this is O2,you need to multiple it.
16×2=32
We get the equation n=m/M where m is for gram
20/32=0.625mol
In Valence Shell Electron Pair Repulsion Theory (VSEPR),
A Bonded electron pairs cancel each other out and do not repel other electrons
B Bonded electron pairs are more repulsive than lone pairs on the central atom
C Bonded electron pairs are less repulsive than lone pairs on the central atom
D Bonded electron pairs are equally as repulsive as lone pairs on the central atom
Answer: look at the close because that is the answer
Explanation:
how many valence electrons are there in a magnesium atom?
Answer:
Magnesium has 2 valence electrons.
what is an electron ?state it's relatively mass and charges.
Answer:
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
mass: 9.1093837015 × 10−31 kg
charges: fundamental physical constant expressing the naturally occurring unit of electric charge, equal to 1.602176634 × 10−19 coulomb.
Explanation:
good luck !<3
how many moles of c are formed upon complete reaction of 2 mol of b according to the generic chemical reaction: a 2b->c
Answer:
1 mol
Explanation:
It's about balacing the equation. 2 parts "b" can form 1 part "a". So take 2 mol and divide by 2.
for our sample energy scoring sheet, how do we calculate the energy of roasting?
multiply your temp change by 12
hope this helps!
which compound is soluble in excess ammonia solution. A. Copper (II) sulphate B. iron (II) chloride. C.Magnesium chloride. D. Magnesium Chloride
when chlorine gains an electron to have 8 valence electrons and become stable, will it increase, decrease or stay the same in terms of the atomic radius
Answer:
It becomes an ion
Explanation:
The element it took from becomes a positive ion
And chlorine becomes a negative ion
Why are herbivores in level two of a food
web?
Worth 20 points :)
Answer:
Hey mate....
Explanation:
This is ur answer....
They tend to be small in size and there are many of them. The primary consumers are herbivores (vegetarians), Because of this inefficiency, there is only enough food for a few top level consumers, but there is lots of food for herbivores lower down on the food chain. There are fewer consumers than producers.
Hope it helps!
Brainliest pls!
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In the malate-aspartate shuttle, _____ is reduced to _____ in the cytosol. oxaloacetate; malate aspartate; malate malate; aspartate malate; oxaloacetate aspartate; oxaloacetate
The malate-aspartate shuttle enables oxidative phosphorylation by allowing electrons to be moved across the inner membrane in the mitochondrion during glycolysis in eukaryotes.
In this malate-aspartate shuttle, oxaloacetate is reduced to malate in the cytosol.
During this biochemical system process, the cytosolic malate dehydrogenase which is the primary enzyme present in this shuttle system catalyzes the reaction of oxaloacetate and NADH to produce malate and NAD in the cytosol. This system enables oxidative phosphorylation in eukaryotes.Learn more: https://brainly.com/question/17216910
Please help!! I don’t know what to do.
Answer:
C
Explanation:
No reaction because not enough moles of silver are present for the reaction to occur.
how do you write the names and formulas for ionic compounds with polyatomics
Here are some steps i know from my teacher:
When you write a formula from a home you must follow these rules
1) Write down the name you must follow these rules
2)Write down the symbols for the elements and group in the compound of elements
3)Write down the valency
4)Adjust the number of atoms of each element or group valency is the combining capacity of elements with one another.
I NEED HELP AYEEYYEYWY
how is the chemical reaction for iron (II) + carbonate
iron (III) + carbonate
and iron (III) and (II) + sulfate
Answer:FeCO3 + 2HNO3 > Fe(NO3)2 (salt) + H20 (water) + CO2(carbon dioxide)
Explanation:
Carbonate-with-acid reactions form these three things
True or false? Simple molecular substances contain delocalised electrons.
Answer:false
Explanation:
What is the best cream to get rid of self harm scars?
not cream, but it I know that coconut oil and honey heals scars in general! I fell once and it was a terrible scar and i places coconut oil at night and the day a little honey and within a few days the scar was unnoticeable. it's sure it will help the same. Remember you are loved and you have so much worth. I am so proud of how far you have come I'm life. <33
Which of the following shows a valid combustion reaction?
2Al + 2O2 → 2AlO + O2
C2H4 + 3O2 → 2CO2 + 2H2O
2CH4 + O2 → 2CO + 4H2
Ca + O2 → CaOH
Combustion reaction means two common products
CO_2H_2OOption B is correct
[tex]\\ \sf\longmapsto C_2H_4+O_2\longrightarrow 2CO_2+2H_2O[/tex]
What are the features that allow you to identify an ionic compound based on its chemical formula
Answer:
first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.
Explanation:
help<3
If a solid object is taken from Earth far into space, which of the following measurements of the object
will change the most?
A. density
B. mass
C. volume
D. weight
Answer:
D. weight
[tex] \: [/tex]
If a solid object is taken from Earth far into space, which of the following measurements of the object will change the most?
A. density
B. mass
C. volume
D. weight
Answer:-option D. weight
Explanation:-Because the gravity of the planet/object changes, the weight of the object changes when you move it away from the earth or place it on another planet.
However, the mass of the object remains the same regardless of whether it is on Earth or outer space.
which electrode serves as the anode, and which as the cathode?
Pt serves as the cathode, Cd as the anode.
I'm quite sure this is the answer
Hope it helps!
⚠️⚠️⚠️⚠️HELPPP⚠️⚠️⚠️⚠️
A 250 kg rock falls off a cliff and comes to a rest on the ground, which is 40m below the cliff. At what point is the rock’s kinetic energy at maximum?
Answer:
at 39m
Explanation:
because thats where gravitational potential energy has been acting on it the most before it hits the ground.
pretty sure btw
A chain reaction is created in a nuclear plant when U-235 in the fuel rods is bombarded with _____, causing the nucleus to become unstable and split.
Answer:
nuclear fission.
that's the answer
Hey guys! How is the answer C? I need steps plz
For a reversible system, the entropy change of the system is equal to entropy transferred with _____.
Answer:
Heat
Explanation:
A. Parts of Solutions
1. The substance that exists in the greatest quantity in a solution is called
the
Answer:
a
Explanation:
the substance that exists
diagram of a separate funnel
Answer:
Separation techniques
Separating Funnel - Separation techniques
Explanation:
if you look this up this should help i think
Find the pOH for the following:
A 1.34 x 10^-4 M solution of hydrochloric acid.
A) 10.13
B) 3.87
C) 4
D) 10
Answer:
A) 10.13 is the answer
Explanation:
Since HCl is a strong acid, its pH can be found by simply plugging it into the equation:
pH = -log[H+]
*H+ is just the concentration you were given*
Now that you have the pH, you just subtract it from 14 to find the pOH
I have attatched my work below. Hope this helps! :^)
To find the pOH of a solution, you can use the formula: pOH = -log10[OH-]
What is pOH?pOH is a measure of the concentration of hydroxide ions (OH-) in a solution. It is the negative logarithm (base 10) of the hydroxide ion concentration.
In this case, since we have hydrochloric acid (HCl), we need to consider the concentration of hydroxide ions (OH-) produced when HCl dissociates in water.
HCl is a strong acid and completely dissociates, meaning it produces an equal concentration of hydrogen ions (H+) and chloride ions (Cl-) in water. Since there are no hydroxide ions produced, the concentration of hydroxide ions is 0.
Therefore, the pOH of a hydrochloric acid solution is 0, and none of the options provided (A, B, C, D) is the correct answer.
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The reaction is at dynamic equilibrium.
N2 + 3H2 ⇌ 2NH3
Which statement is correct?
(1 point)
The solution has the same concentrations of nitrogen gas and ammonia.
The solution has the same concentrations of nitrogen gas and ammonia.
Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
The solution has the same concentrations of nitrogen and hydrogen gases.
The solution has the same concentrations of nitrogen and hydrogen gases.
Both directions of the reaction have stopped.
Both directions of the reaction have stopped.
When the reaction N₂ + 3 H₂ ⇌ 2 NH₃ is at dynamic equilibrium, Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
The reaction is at dynamic equilibrium.
N₂ + 3 H₂ ⇌ 2 NH₃
Which statement is correct?
The solution has the same concentrations of nitrogen gas and ammonia. NO. Even though we don't know the equilibrium constant, it is unlikely that N₂ and NH₃ have the same concentrations at equilibrium. Nitrogen and hydrogen combine at the same rate that ammonia breaks down. YES. At the equilibrium, the forward rate is equal to the reverse rate. The solution has the same concentrations of nitrogen and hydrogen gases. NO. Even though we don't know the equilibrium constant, it is unlikely that N₂ and H₂ have the same concentrations at equilibrium. Both directions of the reaction have stopped. NO. The reactions don't stop because the equilibrium is dynamic.When the reaction N₂ + 3 H₂ ⇌ 2 NH₃ is at dynamic equilibrium, Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
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pls help asap....................
things which are matter but not substance
Answer:
Vacuum
Explanation:
It may be bounded by a volume. Energy: Light, heat, kinetic and potential energy, and sound are non-matter because they are massless. Objects that have mass and are matter may emit energy.