Answer:
NMR (Nuclear magnetic resonance) is modern spectroscopy technique to study a variety of nuclei for e.g. 1H NMR, 2H NMR, 13C NMR, 15N NMR, 19F NMR etc
When any nuclei is place in any external magnetic field it starts spinning according to flamings right hand rule & the angular frequency of nuclei is called as Larmor Frequency (ω), and the charged nuclie generates oscillating electric field . There are two energy states Alpha state and Beta state depending on the alignment of spinning nuclie.
If radiowave of frequency (ω) is supplied to the operation the two electric field couples and energy gets absorbed by the nucleus this process is known Resonance.
Depending on the environment of all protons, not all protons absorbs the same amount of energy and the protons are shielded by electrons from the external magnetic field.
Tetramethylsilane (TMS) is used for 1H and 13C NMR, have the delta shift value of 0 PPM
[tex] \sf \: \delta \: shift = \frac{shift \: from \: TMS \: in \: Hz}{spectrometer \: frequency \: in\: MHz} [/tex]
The number of signals of any compound depends on the chemical shift, at every specific shift NMR shows a signal.
Let's understand step by step:
Consider the simplest organic molecule in Organic chemistry methane, methane have only one carbon atom hence it shows only One 13C NMR signal.
Let's move to ethane, ethane have two carbon atoms but the environment of both carbon atom are same that they are terminal carbon bounded to 3 H atoms each. since the chemical environment of both the Carbon atom is same it will again show only One 13C NMR signal.
Now coming to propane, propane have three carbon atoms, two on terminal (methyl groups) and one that is in middle touching both the carbon atoms, the Chemical environment of terminal two carbons are same so they both together will show one peak and the middle carbon(-CH2 group) have different environment so it will show the signal at different shift. Hence the total number of 13C NMR signal would be two!
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Giving BRAINLIEST, please HELP!
Answer:
Its the last one freezing and condensation.
Explanation:
because the line is moving up so it has to be freezing and if it was going down it would have been melting
How many grams of He are necessary to fill a balloon having a volume of 4.50 × 10^{3} mL to a pressure of 1.14 × 10^{3} torr at 25.0ºC?
The mass in grams of He are necessary to fill a balloon having a volume of 4.50×10³ mL to a pressure of 1.14×10³ torr at 25.0ºC is 1.104 grams.
How do we calculate the grams from moles?Mass (W) in grams from moles (n) will be calculated by using the below equation:
n = W/M, where
M = molar mass
Moles of helium gas will be calculated by using the ideal gas equation:
PV = nRT, where
R = universal gas constant = 62.363 L.torr / K.mol
P = pressure of gas = 1.14×10³ torr
V = volume of gas = 4.50×10³ mL = 4.50 L
n = moles of gas = ?
T = temperature = 25.0ºC = 298 K
On putting these values on the ideal gas equation, we get
n = (1140)(4.5) / (62.363)(298) = 5130 / 18584
n = 0.276 moles
Now we convert this moles into mass by using the first equation as:
W = (0.276mol)(4g/mol) = 1.104 g
Hence required mass of helium gas is 1.104 grams.
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Whenever there is a change of state, such as solid to liquid or liquid to gas, heat energy can be added without a temperature change because
Answer:
The change of state requires energy.
Explanation:
Instead of the energy changing the temperature the heat energy is used by changing its form.
what is kind of property is denisty?
Answer:
INTENSIVE PROPERTY OF MATTER
Explanation:
DENSITY IS AN INTENSIVE PROPERTY OF MATTER THAT ILLUSTRATES HOW MUCH MASS A SUBSTANCE HAS IN A GIVEN AMOUNT OF VALUE,
A swimming pool reading reports that chlorine is present at 130 ppm. How many grams of chlorine are present per liter of pool water?
130 ppm will contain 0.12985167 grams of chlorine present in per liter of pool water.
What is ppm?This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L).
1001.142303 ppm is equal to 1 g/L
So, 130 ppm will contain [tex]\frac{130}{1001.142303}[/tex] grams of chlorine present in per liter of pool water which is equal to 0.12985167 gram/L.
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What is the molar concentration of HBr if 25 mL of the acid is titrated 15.3 mL of 0.5 M KOH?
Round answer to 2 decimal places.
If the change in Gibbs free energy for a process is positive, the corresponding change in entropy for the universe will be
If the change in Gibbs free energy for a process is positive, the corresponding change in entropy for the universe will be positive.
What is Gibbs free energy?This is defined as the energy used by a substance involved in a chemical reaction.
The Gibbs free energy and entropy has a direct relationship which is why a positive gibbs free energy will result in a corresponding positive entropy.
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Answer: The correct answer is Negative
My cousin cant figure this out and neither me so maybe yall can help?
Answer:
I believe the Answer is B
Write symbol and ionic equations to show the reaction
between magnesium and oxygen to form magnesium
oxide
Answer:
2Mg + O2 ⇒ 2MgO
When determining the cell potential for a hypothetical galvanic cell containing two different materials, how do we determine which substances comprise the anode and which comprise the cathode
To determine the substance that comprises the anode and the cathode in a galvanic cell is by determing ;
The material with the larger (more positive) standard reduction potential that will be the cathode.
Characteristics of a galvanic cellIn a galvanic cell, oxidation which leads to the loss of elctrons occurs at the anode, while reduction ( addition of elctrons ) occurs at the cathode. therefore the materials with a more positive standard reduction potential will be the cathode of the galvanic cell.
Hence we can conclude that The material with the larger (more positive) standard reduction potential will be the cathode.
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What is the name of bird W?
Answer:
woodpecker it's easy lil lol
PLEASE ANSWER! 5 STAR RATING - THANKS (PROFILE TOO) - BRAINLIEST IF 2 ANSWERS
A 14 V battery powers the headlights of a car. What is the resistance of the
headlights if they draw 3.0 A of current when turned on?
Answer: 9514 1404 393
4 2/3 ohms
The resistance is the ratio of voltage to current.
R = V/I
R = (14)/(3) = 4 2/3 . . . ohms
Explanation:hi ^^ have a great day hope this helps xlXCherryColaXlx (nice pfp btw)
3 grams of Aluminum was heated from 20 °C to 662 °C while absorbing
1728 I of heat. What is the specific heat of Aluminum?
The specific heat capacity of Aluminum of mass 3 grams that was heated from 20 °C to 662 °C while absorbing 1728 J of heat is 12.5 J/g°C.
What is specific heat capacity?The specific heat capacity of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureAccording to this question, 3 grams of Aluminum was heated from 20 °C to 66.2 °C while absorbing 1728 J of heat.
1728 = 3 × c × (66.2 - 20)
1728 = 138.6c
c = 1728 ÷ 138.6
c = 12.5 J/g°C
Therefore, the specific heat capacity of Aluminum of mass 3 grams that was heated from 20 °C to 662 °C while absorbing 1728 J of heat is 12.5 J/g°C.
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An electric motor in a bike has a voltage of 24 V and produces 240 W of power. How much current does it draw?]
Answer:
Electrical energy is the product of power multiplied by the length of time it was consumed. So if we know how much power, in Watts is being consumed and the time, in seconds for which it is used, we can find the total energy used in watt-seconds. In other words, Energy = power x time and Power = voltage x current.
The amount of current the electric motor having a power of 240 W Will draw from the 24 V supply is 10 A
What is power?This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:
Power (P) = voltage (V) × current (I)
P = IV
How to determine the currentFrom the question given above, the following data were obtained:
Voltage (V) = 24 V
Power (P) = 240 W
Current (I) = ?
P = IV
240 = I × 24
Divide both sides by 24
I = 240 / 24
I = 10 A
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What mass of kool-aid is needed to make a 0.5-M solution from 100 mL?
Answer:
but purely citric acid synthetic Acid whose moller mass is equal to 192 g per mole. Okay, so here we have Modernity is even McGarity is equal to 0.5 M and we have volume, so Volume is equal to 200 mililiters is equal to 0.1 liter Okay, so they are asking to calculate the mass of what u have Okay. So first of all, if we want to calculate the mass of then we have to calculate the number of moles. So maturity is equal to the number of moles per volume in liters . So you mean zero point sorry from this one number of moles is equal to So N is equal to m multiplied very weak. So that is equal to 0.1 and 0.5. So that is equal to 0.05 moles. Okay, now the mask is equal to the mass of cool eh is equal to the number of Okay. Number of 0.5 and it is multiplied by 92 g per mole. Then it is equal to 9.6 g. So this is the mass of a present. A 0.500 ml
How might the ability of magnets to attract or repel other magnets relate to
the floating rings?
Answer:
Using magnets to repel each other is one way to try to achieve a frictionless bearing. In practice, it can be difficult to remove all friction. While a pair of magnets will repel each other, they are not stable in this condition. One magnet won't simply float forever above another magnet.
Explanation:
please write the measure of this bat plsss
Answer:
10 + 3/4 = 10 3/4 units ( inches <==== I think)
Explanation:
Which best explains the relationship between evaporation and temperature?
A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed as easily from the liquid’s surface.
A liquid evaporates faster at lower temperatures because the attractions are decreased and more particles can escape the surface of the liquid.
A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, so fewer molecules can escape the surface.
A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
A liquid evaporated slow at higher temperature bz the vapour pressure of the is higher so few molecule can escape the surface
Answer:
The correct answer is D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Explanation:
I just got it right on Edge.
Hope this helped!
Brainliest would be greatly appreciated :D
Equation Given : Al^(3+) + Na3PO4 ==> 3Na^+ + AlPO4
Given that 61µg of aluminum phosphate precipitate formed, calculate the micromoles of aluminum ions in 50 mL of river water. (1µg = 1 x 10^(-6)g)
1 mols of Aluminium ion forms 1 mol aluminium phosphate
Molar mass of AlPO_4
27+31+16(4)58+48106uMoles of AlPO_4
61µg/1060.000061/1065.75×10^{-7}57.5µmolMoles of Al3+=57.5µmol
Strong nuclear forces inside the atomic nucleus tend to ____ .
a. cause nuclear decay
b. hold the nucleus together
c. make the nucleus unstable
d. push the nucleus apart
Answer: a. cause nuclear decay
Explanation:
Fill In the
476 nm = 4.76 x 10^? Cm
Recall that 1 nm 1 x 10 m and 1 cm = 1 x 10-2 m. You will want to memorize the metric conversion factors and those covered in this lesson!
Answer:
I gotthe answer
Explanation:
The explanation is This
Now writing the value in sentific term
It would look like
[tex]4.76 \times {10}^{2} \times {10}^{ - 9} [/tex]
[tex]4.76 \times {10}^{2 - 9} [/tex]
4.76
[tex]4.76 \times {10}^{ - 7} [/tex]
Now in centimeter
[tex]4.76 \times {10}^{ - 5} [/tex]
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
Classify the following type of stoichiometry problem: How many cubic centimeters of oxygen are produced from decomposing 5.00 mL of steam? (Sec.9.3)
(a) mass–mass problem
(b) mass–volume problem
(c) volume–volume problem
(d) mole–mole problem
(e) none of the above
Answer:
volume problem
Explanation:
cubic usually means volume
student A correctly describes a chemical equilibrium is “reactant favored” and student B also correctly describes the same equilibrium as “product favored”. Can this happen? If so how?
ANSWER ASAP!!
Detective Gundy found several areas in a warehouse where fires appeared to have started. What can he MOST likely conclude from this
evidence?
A Someone deliberately set fires at different points around the warehouse
B. Several people accidentally dropped lit cigarettes around the warehouse
OC Strong winds spread the fire throughout multiple areas in the warehouse,
D. There was no accelerant used to start any of these fires
Given what we know, we can confirm that based on the evidence found, someone deliberately set fires at different points around the warehouse.
Why do we think the fires were deliberate?This has to do with the natural way in which fires spread. Fires that occur naturally or accidentally tend to concentrate in one place, then spread throughout the warehouse over time, however, this is not what the detective found. Instead, there are indications that multiple fires started simultaneously.
Therefore, given the very unlikely nature of this occurring naturally, we can confirm that based on the evidence found, someone deliberately set fires at different points around the warehouse.
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A solution is prepared by dissolving 17. 1 g of sucrose (C12H220,1) in 275 g of H2O.
a. What is the molar mass of sucrose?
b. What is the molality of that solution?
Answer:
If you know the formula to use you should have no trouble getting the answers.
molality = mols/kg solvent.
mols sucrose = g/molar mass
kg solvent = 0.275 kg.
Can someone please help me? :(
Answer:
Roots, stems and leaves
Explanation:
A, B, and D
Hope this helps!
Answer:
A, B y D
Explanation:
If you had 100 grams of wax(C25H52), predict...
1.how many grams of o2 would be needed to react with 100 grams of wax
2.How many CO2 would be produced?
3.How many grams of H2O would be produced?
Answer:
2 i think should be the correct answer
Explanation:
explain volume and pressure at constant temperature of a gas using the kinetic molecular
Answer:
If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. If the volume is held constant, the increased speed of the gas molecules results in more frequent and more forceful collisions with the walls of the container, therefore increasing the pressure
Explanation:
hope this helps
Can someone please help me? :(
Answer:
C I think
Explanation:
A duck isn't supposed to bring a sandwich to people, so i believe that the duck learned how to do that. (Sorry if it's wrong)
disadvantages of hard water
Answer:
Here are some disadvantages
Explanation:
Hard water does not pose a health threat.
Hard water can contribute to dry skin and hair.
Hard water is unfit for washing as it is difficult to form lather with soap.
Trimming of kettles will take place due to the formation of magnesium and carbonates of calcium.
The Taste/Smell
Lather
Dishwashing Ability
Clothes-Washing Ability
Staining
Limescale Buildup
Corrosion