Answers
Answer:
Approximately [tex]3.03\times 10^{-19}\; \rm J[/tex], which corresponds to a wavelength of approximately [tex]6.56 \times 10^{2}\; \rm nm[/tex] in vacuum.
Explanation:
When the electron of a hydrogen atom transits from energy level [tex]n_1[/tex] to [tex]n_2[/tex], the energy change would be:
[tex]\displaystyle \Delta E \approx 2.179 \times 10^{-18}\; {\rm J} \, \left(\frac{1}{{(n_1)}^{2}} - \frac{1}{{(n_2)}^{2}}\right)[/tex].
For the transition from [tex]n_1 =3[/tex] to [tex]n_2 = 2[/tex]:
[tex]\begin{aligned}\Delta E &\approx 2.179 \times 10^{-18}\; {\rm J} \, \left(\frac{1}{{(n_1)}^{2}} - \frac{1}{{(n_2)}^{2}}\right)\\ &= 2.179 \times 10^{-18}\; {\rm J} \, \left(\frac{1}{{3}^{2}} - \frac{1}{{2}^{2}}\right) \\ &\approx -3.02639 \times 10^{-19} \; \rm J \\ &\approx -3.03\times 10^{-19}\; \rm J\end{aligned}[/tex].
The value of [tex]\Delta E[/tex] is negative because energy is released during this transition.
Look up Planck's Constant (for finding frequency from energy) and the speed of light in vacuum (for finding wavelength from frequency.)
Planck's Constant: [tex]h \approx 6.62607 \times 10^{-34} \; \rm J \cdot s^{-1}[/tex].Speed of light in vacuum: [tex]c \approx 2.99792 \times 10^{8}\; \rm m \cdot s^{-1}[/tex].Calculate the frequency [tex]f[/tex] of photons from this transition using the Planck-Einstein relation:
[tex]E = h \cdot f[/tex].
Therefore:
[tex]\begin{aligned}f &= \frac{E}{h}\end{aligned}[/tex].
Calculate the wavelength [tex]\lambda[/tex] of these photos in vacuum:
[tex]\begin{aligned}\lambda &= \frac{c}{f} \\ &= \frac{c}{ E/ h} \\ &= \frac{h \cdot c}{E} \\ &\approx \frac{6.62607 \times 10^{-34}\; \rm J \cdot s \times 2.99792 \times 10^{8}\; \rm m \cdot s^{-1}}{3.02639 \times 10^{-19}\; \rm J} \\ &\approx 6.65 \times 10^{-7}\; \rm m \\ &= 6.65 \times 10^{-7}\; \rm m \times \frac{10^{9}\;\rm nm}{1\; \rm m} \\ &= 6.65 \times 10^{2}\; \rm nm\end{aligned}[/tex].
Related Questions
Why is solubility critical when fighting a hydrocarbon fire?
Answers
Answer:
Unlike other extinguishing agents - water, dry chemical, CO2, etc., a stable aqueous foam can extinguish a flammable or combustible liquid fire by the combined mechanisms of cooling, separating the flame/ignition source from the product surface, suppressing vapors and smothering. It can also secure for extended periods of time against reflash or reignition. Water, if used on a standard hydrocarbon fuel, is heavier than most of those liquids and if applied directly to the fuel surface, will sink to the bottom having little or no effect on extinguishment or vapor suppression. If the liquid fuel heats above 212ºF, the water may boil below the fuel surface throwing the fuel out of the contained area and spreading the fire. For this reason, foam is the primary fire-extinguishing agent for all potential hazards or areas where flammable liquids are transported, processed, stored or used as an energy source.
this is what I found, hope it helps
In contrast to other extinguishing agents such as water, dry chemical, CO2, and so on, a stable aqueous foam can extinguish a flammable or combustible liquid fire through a combination of cooling, separating the flame source from the product surface, suppressing vapors, and smothering.
What is solubility ?The term solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
It can also protect against ref lash or reignition for extended periods of time. Water is heavier than most liquids when used on a standard hydrocarbon fuel and will sink to the bottom if applied directly to the fuel surface, having little or no effect on extinguishment or vapor suppression.
If the liquid fuel heats above 212°F, water may boil beneath the fuel surface, releasing the fuel and spreading the fire.
Thus, dry chemical, CO2, and so on, a stable aqueous foam can extinguish a flammable or combustible liquid fire through a combination of cooling.
To learn more about the solubility, follow the link;
https://brainly.com/question/22185953
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write the subshell electron configuration (i.s. 1s2 2s2, ect.) for S16 atom
Answers
Answer:
1s22s22p63s23p4.Select the correct image.
Which structure is a valid representation of a hydrocarbon molecule?
Н
1
Н-С-Н.
Н
Н
Н
Н
Н
1
н-с-н
Н Н
Н Н
1 1
1 1
Н-С—С—С—С—С-Н
1 1 1 1
Н Н H Н Н
H— С—С=С—С—С-Н
1
1 І
1
Н Н Н Н Н
Н
1
H-C-H
Н Н
Н Н
1 1
Н-С—С—С С— С
1
1
1
Н Н Н Н Н
Н
1
H-C-H
Н
Н
1
1
H-C— C-CEC— C-H
Н н н н Н
Answers
Answer:
H-C-H
Explanation:
hydrogen plus carbon hdrocloide
A 5.41 g sample of carbon reacts with hydrogen to form 6.32 g of an organic compound. What is the empirical formula of the organic compound?
Answers
Answer:
CH₂
Explanation:
From the question given above, the following data were obtained:
Mass of Carbon (C) = 5.41 g
Mass of compound = 6.32 g
Empirical formula =?
Next, we shall determine the mass of Hydrogen (H) in the compound. This can be obtained as follow:
Mass of Carbon (C) = 5.41 g
Mass of compound = 6.32 g
Mass of Hydrogen (H) =?
Mass of H = mass of compound – mass of C
Mass of H = 6.32 – 5.41
Mass of H = 0.91 g
Finally, we shall determine the empirical formula of the compound. This can be obtained as follow:
Mass of C = 5.41 g
Mass of H = 0.91 g
Divide by their molar mass
C = 5.41 / 12 = 0.451
H = 0.91 / 1 = 0.91
Divide by the smallest
C = 0.451 / 0.451 = 1
H = 0.91 / 0.451 = 2
Thus, the empirical formula for the compound is CH₂
Which periodic trend tells us how tightly an atom holds an electron in a bond?
Answers
Answer: Periodic Trends
Zeff increases because the positive charge of the nucleus increases while the outermost electrons stay the same distance from the nucleus (filling the same orbital). In other words, going across a period, the outermost electrons are more tightly held. This explains the trend in atomic radius.
It refers to how strongly an atom attracts electrons from other atoms. Electronegativity is a measure of an atom's ability to draw electrons towards itself, or the ability of the nucleus to hold electrons tightly
hope this helps have a great day❤️
Explanation:
How many mol of C3H8 are consumed when 3 mol of CO2 are produced ?
Answers
Answer:
1 mol C₃H₈
Explanation:
Step 1: Write the balanced equation for the combustion of C₃H₈
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of C₃H₈ to CO₂ is 1:3.
Step 3: Calculate the moles of C₃H₈ consumed when 3 moles of CO₂ are produced
We will use the established molar ratio.
3 mol CO₂ × 1 mol C₃H₈/3 mol CO₂ = 1 mol C₃H₈
polycondensation reaction takes place between 1.2 moles of a dicarboxylic acid, 0.4 moles of glycerol (a triol) and 0.6 moles of ethylene glycol (a diol). A.Calculate the critical extents of reaction for gelation using (i) the statistical theory of Flory and (ii) the Carothers theory.B.Comment on the observation that the measured value of the critical extent of reaction is 0.866.
Answers
Answer:
(a). (I). 0.816; 0.816
(ii). 0.917.
(b). When the value for the critical extent of reaction is 0.866, then the number of moles of glycerol and the number of moles of di-carboxylic acid is the same. But, in this case the number of moles of glycerol is not the same with the number of moles of di-carboxylic acid.
Explanation:
So, without mincing words let's get straight into the solution to the question above.
(a). Using the (i) statistical theory of Flory to Determine the critical extent of reaction gelation, one has to make use of the two equations given below;
P(1) = [ v + vb ( n - 2)^-1/2 ------------------(1).
P(2) = v^1/2 [ 1 + b ( n - 2)^-1/2 ----------(2).
The value for v = 1.2 + 1.2/ 1.2 × 2 = 1.
The value of b = (1.2 + 1.2)/ 1.2 = 0.5.
Thus, putting the values into the equation (1) and (2) above gives;
NB: n = 3.
P(1) = [ 1 + 1 × 0.5 ( 3 - 2)^-1/2 = 0.816.
P(2) = 1^1/2 [ 1 + 0.5 ( 3 - 2)^-1/2 = 0.816.
Using the (ii) carother's theory to Determine the critical extent of reaction gelation.
We have the following values for glycerol: k = 0.4, n = 3.
For ethylene glycol; k = 0.6, n = 2.
Therefore, the critical extent of reaction gelation =2/[ (0.6 × 2) + (0.4 × 3) + (1.2 × 2)/ (0.6 + 0.4 + 1.2)] = 2/ 2.18 = 0.917
(b). When the value for the critical extent of reaction is 0.866, then the number of moles of glycerol and the number of moles of di-carboxylic acid is the same. But, in this case the number of moles of glycerol is not the same with the number of moles of di-carboxylic acid.
Help me with this one please!
Answers
Answer:
sorry i dont know
Explanation:
Which shows a monosaccharide?
Answers
Cuz D is cyclo-thingy molecule and its a sugar
(i think A is fatty acid or other molecules and C is hydrocarbon. B dont have oxygen)
Monosaccharides are the group of carbohydrates that are the simplest form of sugar. Option D. galactose is a monosaccharide sugar.
What are monosachharides?Monosaccharides are simple sugars and are the fundamental unit of carbohydrates. The general structural formula for the monosaccharides is [tex]\rm (CH_{2}O)_{n}.[/tex]
The structure of the monosaccharide sugar contains carbon, oxygen, and hydrogen molecules in their structure. Option A. is a fatty acid molecule, and option B. lacks an oxygen molecule, and hence they are not monosaccharides.
Option C. is a hydrocarbon chain that lacks oxygen molecules and option D. is a galactose that is a simple sugar with six carbon atom rings.
Therefore, option D. galactose is the monosaccharide.
Learn more about monosaccharides here:
https://brainly.com/question/5282729
What is the name of the polyatomic in MgSO4?
Answers
Answer:
Magnesium Sulfate
Explanation:
Answer:
magnesium sulfate
Explanation:
mg stands for magnesium and SO is sulfate
Some advocates of anabolic steroid use report that testicular atrophy associated with use of trenbolone can be alleviated if users also inject themselves with human chorionic gonadotropin, a hormone similar in structure and function to LH and FSH. Please explain how this treatment might work.
Answers
Answer:
Human chorionic gonadotropin (HCG) injections are much safer to use with some mild side effects to treat issues of testicular atrophy. Human chorionic gonadotropin (HCG) injections would increase blood flow and enable the testes' produce testosterone, reduce the shrinkage of the testicles and it also aids in the production of sperm cells which has been initially impaired due to testicular atrophy.
Explanation:
Anabolic steroid is a drug that plays the role of testosterone.
Testicular atrophy is the shrinkage of the testicles caused by old age or infections. Once it occurs, it lowers the production of testosterone and sperm cells.
Trenbolone increases muscle building, aids lean fat deposition, reduces the production of testosterone, and could also lead to testicular atrophy.
Which statement below best describes the weather.
---
a
Weather is the average temperature of an area over several years.
b
Weather is recorded yearly.
c
Weather changes and is recorded daily.
d
Weather cannot be predicted.
(SCIENCE)
Answers
Answer:
C
Explanation:
I believe it would be weather because climate is the average temperature of a area. This leads me to believe it is c.
I am sorry if this is incorrect, but that is what I would've went with if I was taking the test. :)
You have competed an extraction procedure on a mixture of compounds known to contain Lauric acid ( it to get necessary physical data) in order to purify it. Your sample was thought to contain 2.75 grams of Lauric acid (along with other junk you no longer care about). You only have 4.0 M sulfuric acid available in the lab. Calculate the volume of sulfuric acid necessary to convert all of the intermediate anion of Lauric acid back into neutral Lauric acid.
Answers
Answer:
3.5 mL
Explanation:
Let us represent lauric acid with the symbol LaCOOH and the anion as LaCOO-. The reaction between the anion and H2SO4 is;
LaCOO-(aq) + H2SO4(aq) -----> LaCOOH(aq) + HSO4-(aq)
Number of moles of LaCOO- = 2.75 g/200 g/mol = 0.014 moles
Since the mole ratio of the reaction is 1:1, then the amount of H2SO4 required is also 0.014 moles
Then;
n = CV
n = number of moles
C= concentration
V = volume
V = n/C
V = 0.014 moles/4.0 M
V= 3.5 * 10^-3 L
V = 3.5 mL
What determines the average kinetic energy of the particles in a gas?
Answers
Answer: The average kinetic energy of the particles in a gas is proportional to the temperature of the gas. Because the mass of these particles is constant, the particles must move faster as the gas becomes warmer. The volume of the gas therefore becomes larger as the temperature of the gas increases.
PLEASE HELP
How should this combustion reaction be balanced?
C5H3 + 02 → CO2 + H20
A. C5Hg + 502 → 5C02 + H20
B. C5Hg + 702 → 5C02 + 4H20
O C. C5H3 + 3.502 → 5C02 + 8H20
D. C5Hg + 302 → CO2 + 4H20
Answers
Answer:
B
Explanation:
All elements on both sides of the equation have the same amount of moles
Predict what would be formed
i) at the anode and
ii)at the cathode when each of the following molten salts are electrolysed using inert electrodes.
a) NaCl
b) MgBr2
c) CaCl2
Its not MCQ's Its Numerical.
Answers
Answer:
No
Explanation:
T6tgbv. 55678 r4fyx a
What volume in milliters would give 12.0 grams of NaOH from a 2.0 M NaOH solution?
Answers
Answer:
V = 150 mL
Explanation:
Hello!
In this case, since the molarity of a solution is computed via:
[tex]M=\frac{n}{V}[/tex]
Whereas we are asked to compute the volume:
[tex]V=\frac{n}{M}[/tex]
Thus, we first compute the moles in 12.0 g of NaOH as its molar mass is about 40.0 g/mol:
[tex]n=\frac{12.0g}{40.0g/mol}=0.3mol[/tex]
Thus, at first instance, the volume liters is:
[tex]V=\frac{0.3mol}{2.0mol/L} \\\\V=0.15L[/tex]
Which in milliliters is:
[tex]V=0.15L*\frac{1000mL}{1L}\\\\V=150mL[/tex]
Best regards!
what is 9 x 10^2/3 x 10^12 in scientific notation?
Answers
Answer:
That would be 4.17742995 * 10^13 :)
Explanation:
Molecules have ?
: A) both potential and kinetic energy. B) only kinetic energy. C) only potential energy. D) neither kinetic nor potential energy.
Answers
Answer:
C) only potential energy.
Help help help help help
Answers
Answer:
neon gas
Explanation:
neon is a noble gas, meaning it has a full outer shell of elections. this means it is stable and is very unlikely to have a reaction with another substance.
pls help !!!! ^^^^^^^^^
Answers
Answer: 1000 kg
Explanation:
I’m a god
Which statement correctly describes a difference between aesexual and sexual reproduction?
Answers
Answer:
(3rd option) Asexually reproduced offsprings have the same amount of genetic information as the parent, while sexually reproduced offsprings have half as much genetic information.
Explanation:
This is variation is caused as a result of both gamete production and fertilisation.
Which of the following best describe gas particles?
SELECT ALL THAT APPLY
A.) moving randomly
B.) collide with each other
C.) move slow
D.) High kinetic energy
E.) moving orderly
Answers
Answer:
A, B and D
Explanation:
Gas particles move randmly at high speed, colliding with each other
A.It is used to generate electricity
B.It produces more energy than fusion
C.It produces waste material that can be radioactive
D.It is the splitting of an atomic nuclues into two or more
fragments
Which of the following is NOT a true statement
about nuclear fission?
Answers
Answer:
Pretty sure the answer is B
Please help!
Calculate the percent by mass of water in FeCl2 · 4H20.
Answers
Answer:
36.23 %
Explanation:
Let's assume we have 1 mol of FeCl₂ · 4H₂O. In that case we would have:
1 mol of FeCl₂, weighing 126.75 g (that's the molar mass of FeCl₂), and4 moles of H₂O, weighing (4 * 18 g/mol) 72 g.Now we can calculate the percent by mass of water:
% mass = mass of water / total mass * 100% % mass = [tex]\frac{72}{72+126.75}[/tex] * 100% = 36.23 %
When light waves from a light source enter the eye, the light is refracted by two structures
before entering the retina to create impulses sent to the optic nerve. Those two structures
are....
A. Iris & comea
B. pupil & lens
C. ciliary muscles & choroid
D. comea & lens
Answers
Refer to the map of "The Major North American Land Biomes" to answer the question.
Animals of the Deciduous Forest Biome may be found:
in Canada
in Texas
in Mexico
east of the Mississippi River
Answers
Answer:
all i can help you with is one of them is Canada. If im
wrong i am sorry.
Explanation:Refer to the map of "The Major North American Land Biomes" to answer the question.
Answer:
is Canada and Texas
good luck and hope it helps
How many grams of oxygen are required to combine with 0.750 grams of nitrogen in the compound: N2O5?
Answers
Answer:
2.14 g.
Explanation:
Hello!
In this case, since the mole ratio between nitrogen and oxygen is 2:5 respectively, we realize we first need the moles of nitrogen given it's atomic mass (14.01 g/mol):
[tex]n_N=0.750g*\frac{1mol}{14.01g}=0.0535molN[/tex]
Now, we calculate the moles of oxygen:
[tex]n_O=0.0535molO*\frac{5molO}{2molN}=0.134molO[/tex]
Then, we compute the moles of oxygen given its atomic mass (16.00 g/mol):
[tex]m_O=0.134molO*\frac{16.00gO}{1molO_2} \\\\m_O=2.14gO[/tex]
Best regards!
As ice cream melts, the particles in it will ____
which causes it to _____ thermal energy.
a. Speed up, lose
b. Speed up, gain
c. Slow down, lose
d. Slow down, gain
Answers
Answer:
a. Speed up, lose
Explanation:
#CARRYONLEARNING
Answer:
b. speed up, gain
Explanation:
A block of wood has a volume of 60 cm^3 and a mass of 240 grams calculate its density.
Please and thank you!!
Answers
Answer:
4 g/cm³
Explanation:
Volume(V) = 60 cm³
mass (m) = 240 gm
density (d) = ?
We know density is defined as mass per unit volume so
d = m / v
= 240 / 60
= 4 g/cm³
Hope it will help