which compound would you be most likely to visualize using uv light on a tlc plate? why?
Answers
You would most likely visualize a compound with conjugated pi systems using UV light on a TLC (Thin Layer Chromatography) plate. Conjugated pi systems are alternating single and double bonds within a molecule. They allow the compound to absorb energy in the UV range, making it visible under UV light.
The reason behind this phenomenon lies in the electronic structure of such compounds. Conjugated pi systems possess delocalized electrons, which can move across the entire molecule. When exposed to UV light, these electrons can be excited to a higher energy level, resulting in the absorption of energy in the form of light.
To visualize a compound using UV light on a TLC plate, follow these steps:
1. Prepare a TLC plate by coating it with a thin layer of silica gel or another suitable stationary phase.
2. Spot the compound of interest onto the plate using a micropipette or a capillary tube. Ensure that the spot is small and concentrated to achieve better separation.
3. Place the TLC plate in a developing chamber containing an appropriate solvent mixture (mobile phase) that will allow the compound to move along the plate.
4. Remove the plate from the chamber once the solvent has traveled an appropriate distance up the plate.
5. Allow the plate to dry, which will enable the compound to adhere to the stationary phase.
6. Expose the plate to UV light, which will cause compounds with conjugated pi systems to absorb the light and appear as glowing spots on the plate.
By visualizing the compound under UV light, you can analyze its migration pattern on the TLC plate and compare it to other compounds or reference materials.
This technique can be used for compound identification, determination of compound purity, or monitoring the progress of a chemical reaction. Remember, the most suitable compound for visualization using UV light on a TLC plate would have a conjugated pi system.
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Related Questions
How many kernel electrons in Ne?
Answers
Answer:
I am pretty sure it has 10 kernel electrons!?!?!?
Hope this helps!!!
Have a great day!!! :)
A photon has energy of 1.8 x 10^-12 Jules. Find the wavelength of this photon.
Show all work!
Answers
A photon has energy of 1.8 x 10⁻¹² Jules. The wavelength of this photon is 11.04 × 10⁻¹⁴ m.
Given that :
Energy of the photon : 1.8 × 10⁻¹² J
Energy of the photon is given by the formula :
E = h v
where,
E = energy of photon
h = Planck constant = 6.626 × 10⁻³⁴ J.s
v = frequency of photon
frequency of photon is given as :
v = c / λ
therefore ,
E = h c / λ
λ = h c /E
c = speed of light = 3 × 10⁸ m/s
λ = (6.626 × 10⁻³⁴ J.s × 3 × 10⁸ m/s) / 1.8 × 10⁻¹² J
λ = 11.04 × 10⁻¹⁴ m
Thus, A photon has energy of 1.8 x 10⁻¹² Jules. The wavelength of this photon is 11.04 × 10⁻¹⁴ m.
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give me the type of reactions ___ CuCO3 → ___ CuO + ___ CO2
Answers
When green copper carbonate{CuCO3} is heated it decomposes forming copper oxide {CuO} and carbon dioxide {CO2}. This is a decomposition reaction.
on a cold winter's day, if you left a cup of water sitting outside, it could freeze. heat is transferred out of the water. describe the behavior of the water molecules and how temperature is affected.
Answers
when heat is transferred out of a cup of water on a cold winter's day, the temperature of the water decreases, causing the water molecules to slow down and eventually freeze into ice.
When a cup of water is left outside on a cold winter's day, heat is transferred from the water to the surrounding air. This causes the temperature of the water to drop. As the temperature of the water decreases, the motion of the water molecules slows down and eventually, they become organized into a solid structure known as ice. This process of changing from a liquid to a solid is known as freezing.
The water molecules in a liquid state are constantly moving and colliding with each other. However, as the temperature drops, the motion of the water molecules slows down and they become more organized. The slower movement of the water molecules allows them to form bonds with each other, forming a crystalline lattice structure that we know as ice.
As a result of this process, the temperature of the water decreases, and when it reaches 0°C (32°F), it will freeze. This change in temperature is a result of the energy being transferred from the water to the surrounding air, as heat is conducted from the hot water to the cold air.
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FILL THE BLANK. ibm's watson utilizes a massively parallel, text mining–focused, probabilistic evidence-based computational architecture called ________.
Answers
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.
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Answer the Question where it says, “Model It!” Thank You! Really Appreciate It! :)
Answers
Answer: Thx for the free points brother!
Explanation: Thx!
identify the overall molecular dipole moment of 1,1-dichloro-2-methylprop-1-ene using a vector arrow. chegg
Answers
The overall molecular dipole moment of 1,1-dichloro-2-methylprop-1-ene can be determined using a vector arrow. The molecule consists of a double bond between carbon atoms 1 and 2, with a chlorine atom attached to each carbon atom.
The methyl group is attached to carbon atom 2. To identify the dipole moment, we need to consider the individual bond dipoles and the molecular geometry. The C-Cl bonds have a polar covalent nature, with chlorine being more electronegative than carbon. Therefore, each C-Cl bond has a dipole moment pointing towards the chlorine atom. Since both carbon atoms have C-Cl bonds, these dipoles cancel out, resulting in no net dipole moment along the carbon-carbon axis.
The methyl group is also polar, with the carbon being more electronegative than the hydrogen atoms. However, the dipole moment of the methyl group is not canceled out by the other bonds in the molecule. Therefore, the net dipole moment of 1,1-dichloro-2-methylprop-1-ene is directed towards the methyl group. In summary, the molecule has an overall dipole moment pointing towards the methyl group. This can be represented using a vector arrow pointing in that direction.
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if a 1.0 mole of ammonnium nitrate nh4no2 was dissolved in 1.0 l of water the ph of the solution would be
Answers
To determine the pH of a solution containing 1.0 mole of ammonium nitrate (NH4NO2) dissolved in 1.0 liter of water:
Ammonium nitrate (NH4NO2) is a salt that dissociates in water to produce ammonium ions (NH4+) and nitrate ions (NO2-). The presence of these ions affects the pH of the solution. The ammonium ion (NH4+) is a weak acid that can undergo partial dissociation, releasing a proton (H+). This proton contributes to the acidity of the solution, resulting in a decrease in pH. To calculate the pH, we need to consider the dissociation of the ammonium ion. Since we are given a 1.0 molar solution of NH4NO2, we can assume that all the ammonium nitrate dissociates completely. However, to determine the exact pH, we also need to know the acid dissociation constant (Ka) of ammonium ions. With this information, we can calculate the concentration of H+ ions and convert it to pH using the formula pH = -log[H+].
Without the specific value for Ka, it is not possible to calculate the pH accurately. The pH of the solution would depend on the Ka value and the concentrations of the dissociated ions.
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An ion has an atomic number of 13, a mass number of 27, and 10 electrons. How many neutrons does the nucleus of the ion have?
14
13
3
27
Answers
Answer:
\(\huge\boxed{\sf 14}\)
Explanation:
Atomic number = 13
Mass number = 27
No. of neutrons:= Mass number - Atomic number
= 27 - 13
= 14\(\rule[225]{225}{2}\)
What is the density of 10. 002 g of water at 20°c in the units of g/ml?.
Answers
Answer:
0.998 g/mL
Explanation:
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20. At STP, an element that is a solid and a
good conductor of heat and electricity
could have an electron configuration of
(1) 2-7
(2) 2-8-8
(3) 2-8-5
(4) 2-8-18-2
20
Answers
Answer:
4
Explanation:
Zinc
Why might someone say walking on earth is like walking on air
Answers
Answer: It can mean To be in a state of extreme happiness. thich nhat hanh once said “People usually consider walking on water or in thin air a miracle. But I think the real miracle is not to walk either on water or in thin air"
Explanation: i know this stuff
Suggest some changes that could be made to this experiment to obtain a more reliable or more precise value for the optimum temperature
Answers
To obtain a more reliable or precise value for the optimum temperature in an experiment, several changes can be made. Here are some suggestions: Replicate the experiment, Increase sample size, Use a narrower temperature range, Utilize more precise temperature control etc
Replicate the experiment: Conducting multiple repetitions of the experiment and calculating the average of the results can help reduce random errors and increase the reliability of the obtained value.Increase sample size: Using a larger sample size can enhance the precision of the data. This provides a more representative picture of the behavior at different temperatures, reducing the impact of outliers or random fluctuations.Use a narrower temperature range: Instead of testing a wide range of temperatures, focus on a narrower range around the expected optimum temperature. This allows for more precise measurements and a better understanding of the specific region where the optimum occurs.Utilize more precise temperature control: Ensure the temperature control apparatus or equipment used in the experiment is capable of maintaining a consistent and accurate temperature. Using advanced temperature control methods, such as precision thermostats or water baths, can minimize temperature fluctuations and improve the accuracy of measurements.Increase measurement frequency: Taking measurements at more frequent intervals during the temperature range can provide a more detailed profile of the response, allowing for a more precise determination of the optimum temperature.For more such questions on optimum temperature visit:
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How does the acidity of a solution change with increasing concentration of hydrogen ions (H+)?
Answers
Answer: If you add acid to a solution the concentration of hydrogen ions (acidity) increases and the pH decreases.
Explanation:
Answer:
The acidity of a solution increases with increasing concentration of hydrogen ions (H+). The concentration of H+ in a solution determines the pH of the solution, with lower pH values indicating a more acidic solution.
Explanation:
how much energy is produced when 93.5 grams of oxygen react with 13.2 grams of hydrogen in the following reaction:
2H2+o2-->2 h2o triangleH=-572kJ
Answers
Answer:
-1670.24 kJ
QUICK Explanation:
ΔH * moles of limiting reactant = Energy produced
-572 kJ/mol * 2.92 moles of O2 = -1670.24 kJ
LONGER EXPLANATION :
2 H2 + O2 -> 2 H2O
ΔH * moles of limiting reactant = Energy produced
enthalpy change or heat of reaction formula
1. Calculate the number of moles of oxygen (O2):
Number of moles = mass / molar mass
Number of moles of O2 = 93.5 g / 32.00 g/mol
≈ 2.92 mol O2
2. Calculate the number of moles of hydrogen (H2):
Number of moles = mass / molar mass
Number of moles of H2 = 13.2 g / 2.02 g/mol
≈ 6.53 mol H2
3. Determine the limiting reactant:
According to the balanced equation,
2 moles of H2 react with 1 mole of O2.
Calculate the moles of O2 based on the moles of H2:
(6.53 mol H2) / (2 mol H2/O2) = 3.27 mol O2
we need 3.27 mol O2 to react with the available H2
BUT only have 2.92 mol of O2 available
O2 is the limiting reactant
4.
Calculate the heat given off by assuming the complete consumption of the limiting reagent
calculate the amount of energy produced using the given enthalpy change (ΔH):
Energy produced = ΔH * moles of limiting reactant
Energy produced = ΔH * moles of O2 reacted
Calculate the energy produced using the given enthalpy change (ΔH):
Energy produced = ΔH * moles of O2 reacted
= -572 kJ/mol * 2.92 mol
≈ -1670.24 kJ
Therefore, approximately -1670.24 kJ of energy is produced when 93.5 grams of oxygen react with 13.2 grams of hydrogen in the given reaction. Note that the negative sign indicates that the reaction is exothermic (energy is released).
chatgpt
draw the structure of the major organic product isolated from the reaction of 1-hexyne with chlorine (1 mol).
Answers
The structure of the major organic product isolated from the reaction of 1-hexyne with chlorine (1 mol) is 3-chloro-1-hexene.
When one mol of 1-hexyne reacts with chlorine, the major organic product isolated from the reaction is 3-chloro-1-hexene.
Structure of the major organic product isolated from the reaction of 1-hexyne with chlorine (1 mol):Explanation:1-hexyne is an alkyne containing six carbon atoms and a triple bond between the first and second carbon atoms. When it reacts with chlorine, the triple bond breaks, and a chlorine atom is added to one of the carbons.
This results in the formation of several products.3-chloro-1-hexene is the major organic product that is obtained from this reaction. It is an alkene that contains six carbon atoms, with a chlorine atom attached to the third carbon atom. Its structure is shown below:
Therefore, the structure of the major organic product isolated from the reaction of 1-hexyne with chlorine (1 mol) is 3-chloro-1-hexene.
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when the reaction cl2 (aq) -> cl- clo3- is balanced in aqueous solution, wha tis the coefficient of h2o
Answers
The balanced equation for the reaction Cl2 (aq) -> Cl- + ClO3- in aqueous solution is:
3 Cl2 (aq) + 6 H2O (l) -> 5 Cl- (aq) + ClO3- (aq) + 6 H+ (aq)
When a chemical substance is said to be "balanced in aqueous solution," it means that the substance is completely dissolved in water and has undergone a chemical reaction where the number of atoms of each element present in the reactants is equal to the number of atoms of each element present in the products. the coefficient of H2O in the balanced equation is 6. This means that 6 molecules of water are required for every 3 molecules of Cl2 that react to produce 1 molecule of ClO3-.
The coefficients represent the stoichiometric ratios between the reactants and products, which can provide important information about the quantities of substances involved in the reaction.
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Correctly explain the atmospheric changes as a result of Boyle's law in and around a shower, and as well the curtains
Answers
As a result of Boyle's law, at constant temperature as the pressure decreases the volume increases.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
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1) How would the temperature change and the calculated heat of neutralization vary if the
volumes remained the same but the concentrations of the acid and the base were
doubled? Explain.
2) How would the temperature change and the calculated heat of neutralization vary if the
concentrations remained the same but the volume of the acid and base was cut in half?
Explain.
Answers
Answer:
1) The standard enthalpy change of neutralization is the enthalpy change when solutions of an acid and an alkali react together under standard conditions to produce 1 mole of water. Notice that enthalpy change of neutralization is always measured per mole of water formed. Enthalpy changes of neutralization are always negative - heat is released when an acid and and alkali react. For reactions involving strong acids and alkalis, the values are always very closely similar, with values between -57 and -58 kJ mol-1. That varies slightly depending on the acid-alkali combination (and also on what source you look it up in!).
2)same of n1
compared to other stars we observe, the sun appears bigger and brighter because:
Answers
Answer:
it is bigger closer to us
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The sun appears bigger and brighter because it is closer to the earth than other stars.
Sun is also a star. There are many stars which are bigger and brighter than the sun, but they appear to be smaller as they are far away from the Earth. No other star other than the sun is closer to the Earth. Sun is 93 million miles far from earth. Sun is the most important natural resource on Earth. It modulates the weather and climate. Plants undergo photosynthesis using the sun's light.
The largest star is the UY Scuti whose radius is 1700 times larger than the sun. Even though UY Scuti is the largest star in the universe, it doesn't appear bigger and brighter compared to the sun as it is approximately 9500 light-years far from us.
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if you were to take a large sample of the four giant planets, the most common element you would find in them is: group of answer choices hydrogen iron oxygen silicon
Answers
If you were to take a large sample of the four giant planets, the most common element you would find in them is Hydrogen.
If you were to take a large sample of the four giant planets, the most common element you would find in them is Hydrogen.
The four giant planets are Jupiter, Saturn, Uranus, and Neptune.
They are sometimes referred to as gas giants due to their large size and gaseous composition.
They are composed mainly of hydrogen and helium with smaller amounts of other elements.
Hydrogen is by far the most abundant element in these planets, making up approximately 90% of their composition. Hydrogen is a chemical element with the symbol H and atomic number 1.
Hydrogen is a light, odorless, colorless, tasteless, non-toxic, and highly flammable diatomic gas with the molecular formula H2.
It is the simplest atom, consisting of one proton and one electron.
In the universe, hydrogen is the most abundant element, accounting for approximately 75% of its elemental mass.
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What are the characteristics of a substance that can be observed WITHOUT changing the identity of the substance?
Answers
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
Answer: Physical Properties
Explanation:
How could the amount of ice cover at the poles be indirectly affected by an increase in evaporation near the equator? Explain.
Answers
When warming temperatures gradually melt sea ice over time, fewer bright surfaces are available to reflect sunlight back into the atmosphere. More solar energy is absorbed at the surface and ocean temperatures rise. This begins a cycle of warming and melting. Warmer water temperatures delay ice growth in the fall and winter, and the ice melts faster the following spring, exposing dark ocean waters for a longer period the following summer.
Changes in the amount of sea ice can disrupt normal ocean circulation, thereby leading to changes in global climate. Even a small increase in temperature can lead to greater warming over time, making the polar regions the most sensitive areas to climate change on Earth.
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When Walker decides that she wants to explore beyond the Milky Way, what does she find?
Answers
Walker found about dying radio galaxy, plasma duct and radio galaxies while exploring over the Milky way galaxy.
What is the Milky Way about?Walker's exploration beyond the Milky Way led her to discover a dying radio galaxy, plasma ducts emitting faint whistles in the Earth's ionosphere, and several of the newest and most peculiar radio galaxies.
Thus, it can be deduced that Walker came across a range of phenomena including dying radio galaxies, plasma ducts, and unusual radio galaxies. Walker may discover various galaxies with distinct features, structures, and residents, beyond the Milky Way.
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See full text below
Jaden Reynolds Astronomy; When Walker decides that she wants to explore beyond the Milky Way, what does she find?
a) Give the molar mass of Xenon
Answers
Answer:
131.293 u
Explanation:
You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100M benzoic acid (pK
a
=4.20) and 0.240M sodium benzoatc. How many milliliters of each solution should be mixed to prepare this buffer? benzoic acid:
Previous question
Answers
To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.
To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.
First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:
pH = pKa + log([A-]/[HA])
Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:
log([A-]/[HA]) = pH - pKa
log([A-]/[HA]) = 4.00 - 4.20
log([A-]/[HA]) = -0.20
Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:
[A-]/[HA] = antilog(-0.20)
[A-]/[HA] = 0.63
The ratio of [A-] to [HA] is 0.63.
Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.
Since the total volume is 100.0 mL, we have the equation: x + y = 100
Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63
Solving these two equations simultaneously will give us the volumes of each solution:
x + y = 100
y/x = 0.63
By substituting y = 0.63x from the second equation into the first equation, we get:
x + 0.63x = 100
1.63x = 100
x = 61.35 mL (rounded to two decimal places)
Substituting this value back into the equation x + y = 100, we find:
61.35 + y = 100
y = 38.65 mL (rounded to two decimal places)
Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.
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pls help asap you can!
Answers
The frequency of the color light, given that it has a wavelength of 5.0×10⁻⁷ m is 6.0×10¹⁴ Hertz (last option)
How do i determine the frequency of the color light?First, we shall list out the given parameters from the question. This is shown below:
Wavelength of color light (λ) = 5.0×10⁻⁷ mSpeed of color light (v) = 3×10⁸ m/sFrequency of color light (f) =?Speed, wavelength and frequency of wave are related by the following formula:
Velocity (v) = wavelength (λ) × frequency (f)
Inputting the given parameters, we can obtain the frequency as shown below:
3×10⁸ = 5.0×10⁻⁷ × frequency
Divide both sides by 5.0×10⁻⁷
Frequency = 3×10⁸ / 5.0×10⁻⁷
= 6.0×10¹⁴ Hertz
Thus, we can conclude that the frequency of the color light is 6.0×10¹⁴ Hertz (last option)
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Below are 5 sets of potential solutes for you to compare. Both members of each pair are very soluble in water. If you had equal molar concentrations of each solution, which member of each pair would theoretically be the better conductor of electricity?
A. CsCl, CaCl2.
B. CaS, Li2S.
C. KBr, AlCl3.
D. AlCl3, MgC2.
E. KI, K2S.
Answers
Answer:
Option D. AlCl₃, MgC₂
Explanation:
We need to dissociate all the salts, to determine the i. (Van't Hoff factor).
The salt who has the highest value, will be the better conductor of electricity
CsCl → Cs⁺ + Cl⁻ i = 2
CaCl → Ca²⁺ + Cl⁻ i = 2
CaS → Ca²⁺ + S⁻² i = 2
Li₂S → 2Li⁺ + S⁻² i = 3
KBr → K⁺ + Br⁻ i = 2
AlCl₃ → Al³⁺ + 3Cl⁻ i = 4
MgC₂ → Mg²⁺ + 2C⁻ i = 3
KI → K⁺ + I⁻ i = 2
K₂S → 2K⁺ + S⁻² i = 3
The biggest i, is in pair D.
Answer:
Look at the Screenshot!!!
Explanation:
Got it right on Odessyware ;) Have a nice day!!!!!
A chemical property is _______________.
Answers
Answer:
Explanation:
chemical bonds between atoms are formed or broken.
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17. Is the scientific method suitable for solving problems only in
the sciences? Explain.
Answers
Answer:
Hey mate
Explanation:
Yes these methods are only used in biology, chemistry, physics, geology and physcology.... They can't be used in maths or other subject, as it is said SCIENCE IS SCIENCE!
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