Answer:
A- upfield
B- down field
C- splitting
D- chemical shift
E- integration
Explanation:
NMR is a spectroscopic technique commonly used to observe the magnetic fields around the nucleus of atoms in a compound under investigation.
A chemical shift is the difference in parts per million (ppm) between the resonance frequency of the observed protons in the compound under study and that of the tetramethylsilane (TMS) (the reference compound in NMR with a chemical shift of zero ppm because all protons in the compound are equivalent).
If signals appear close to the reference signal, the signals are said to appear upfield. If the signals appear far away from the reference, they are said to appear down field.
The presence of protons cause splitting of peaks to the magnitude of n+1. n is the number of neighboring protons. Splitting refers to the appearance of multiple peaks for a single nucleus due to neighboring nuclei.
The area of a signal that corresponds to the number of nuclei at that frequency is called the integration.
Whats principle of Aristotle's do scientist use today
1. Use Dot and cross method to show the bonding of the atoms and state the number of atoms of each element present
a. Magnesium and Fluorine
b. Sodium and Fluorine
c. Sodium and Oxygen
d. Aluminum and Iodine
2. Write the chemical formula using the 4-step method for:
a) Magnesium sulphide,
b) Magnesium Fluoride,
c) Hydrogen Bromide and
d) Iron (III) Oxide.
5. 2.83 g of a sample of haematite iron ore [iron (II)oxide, Fe2O3] were dissolved in c oncentrated hydrochloric acid and the solution diluted to 250 cm3. 25.0 cm3 of this so lution was reduced with tin(II) chloride (which is oxidised to Sn4+ in the process) to for m a solution of iron(II) ions. This solution of iron(II) ions required 26.4 cm3 of a 0.020 0 mol/dm3 potassium dichromate(VI) solution for complete oxidation back to iron(III) ions. (a) given the half-cell reactions (i) Sn4+ (aq) +2e==> Sn2+ (aq) and (ii) Cr2O72- (aq) + 14H H(aq) + 6e- ==> 2Cr3+(aq) +7H206) deduce the fully balanced redox equations for the reactions (i) the reduction of iron(III) ions by tin(II) ions (ii) the oxidation of iron(II) ions by the dichromate(VI) ion (b) Calculate the percentage of iron (II) oxide in the ore.
From the solution of hydrochloric acid that is in the reaction with pottassium dichromate, the fully balanced equation for the reaction is K₂Cr₂O₇+6FeCl + 14HCI→ 2KCl +6FeCl₃ + 2CrCl₃+7H₂0
What is oxidation?This is the chemical reaction that takes place due to the fact that oxygen has been added to a substance.
a. Fe2O3+ 6HCl→2FeCl₂ + 3H₂O
Fe³⁺+e→Fe2+
2FeCl₃+SnCl₂ → 2FeCl₂ + SnCl₄
Fe²⁺ - e→Fe³⁺
K₂Cr₂O₇+6FeCl + 14HCI→ 2KCl +6FeCl₃ + 2CrCl₃+7H₂0
b. 0.02 mol/dm³ = 2x10⁻⁵ mol/ml
26.4 cm³ is the same as 26.4 ml
n(K₂Cr₂0₇) = 26.4 x2x10⁻⁵
This gives 52.8x10⁻⁵
n(FeCls) = 6n(K₂Cr₂0₇) = 3.168 x 10⁻³
n(FeCl₂)= n(FeCl₃) = 3.168x10⁻³
2 x 56 + 3x16 = 160 gram/mol
3.168x10⁻³/2 = 1.584x10⁻³
1.584x10⁻³ x 160 = 0.253
0.253 x 100/2.83 = 8.96 percent
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How many moles are in 7.0g of NaF?
there are .1667 (.17) mols in 7 grams of Sodium Fluoride (NaF)
hope this helps :)
A balloon with volume 650 mL contains 0.10 mol of gas. If an additional 0.05 mol of gas are added to the ballon, what will be the new volume
Answer:
The volume of the balloon increases as you add moles of gas to the balloon by blowing it up. If the container holding the gas is rigid rather than flexible, pressure can be substituted for volume in Avogadro's Law. Adding gas to a rigid container makes the pressure increase
If you had excess chlorine, how many moles of aluminum chloride could be produced from 28.0 g of aluminum?
Answer:
1.04 moles of AlCl₃
Explanation:
Balanced Equation: 2Al°(s) + 3Cl₂(g) => 2AlCl₃(s)
Approach => convert given data (28 g Al°) to moles. The number of moles AlCl₃ would equal the number of moles aluminum because coefficients for Aluminum and Aluminum Chloride are equal.
moles Al° = (28g)/(27g/mole ) = 1.04 mole Al°
From balanced equation moles AlCl₃ produced equals moles of Al° produced = 1.04 mole AlCl₃ because coefficients of Al° & AlCl₃.
the dimensions of a box are 4.5 cm wide by 5.750 cm long by 1.50 cm tall.
Answer:
38.8125
Explanation:
4.5 x 5.750 x 1.50 = 38.8125
What is the mass of frutose also known as fruit (c6h12o6) in a 1.40×10^2ml sample of glucose solution that has a concentration of a 1.23m?
Answer:
m = 129,96 g
Explanation:
c = n / V
n = c * V
n = 1,23 mol/l * 0,14 l
n = 0,722 mol
n = m / M
m = n * M
m = 0,722 mol * 180 g/mol
m = 129,96 g
As the pH of ocean water decreases, it becomes more _____.
Question 2 options:
acidic
basic
Answer:
Acidic
Explanation:
The average pH of the ocean is now around 8.1, which is basic (or alkaline), but as the ocean absorbs more CO2, the pH drops and the ocean becomes more acidic.
so what does b2∛ ÷ n5≅ equal
Answer:
Simplify:
3
√
8
y
3
.
Solution: Use the fact that
n
√
a
n
=
a
when n is odd.
Answer:
2
y
Explanation:
6. What are the correct coefficients in order for the equation to be balanced?
Explanation:
8O² + 1S⁸ ----> 8SO²
this is the true coefficient...
At what number carbon does the phosphate group connect to the sugar?.
Answer:
5' carbon
Explanation:
Attaching a phosphate group
A phosphate group is attached to the sugar molecule in place of the -OH group on the 5' carbon.
Answer:
The phosphate group on one nucleotide links to the 3' carbon atom on the sugar of another one. In the process, a molecule of water is lost - another condensation reaction.
Which particle has the same mass as a neutron?
Answer:
proton
Explanation:
neutron: A subatomic particle forming part of the nucleus of an atom. It has no charge. It is equal in mass to a proton or it weighs 1 amu.
Answer:
protons
Explanation:
approximately the same mass
an alien civilization has different names and symbols for six elements. place each element in the correct location in the periodic table
Answer: this is the correct answer :)
Explanation:
Image shows ;)
Which type of precipitation is most likely to form during a thunderstorm A sleet
B hail
C snow
D freezing rain
Hail is most commonly formed within the cumulonimbus clouds of thunderstorms. Large updrafts of air can throw rain droplets high up into the tops of the cloud.
What is a thunderstorm?
A thunderstorm is a type of weather phenomenon characterized by thunder, lightning, and often heavy rain or hail. Thunderstorms are caused by the rapid upward movement of warm, moist air, which condenses into clouds and releases heat energy. This process can create strong updrafts and downdrafts within the cloud, which can lead to the formation of lightning and thunder.Thunder is caused by the rapid expansion of air around a lightning bolt, which creates a shock wave that we hear as thunder. Lightning is caused by the discharge of electrical energy between clouds or between a cloud and the ground. Lightning strikes can be very dangerous, and it is important to take precautions during a thunderstorm, such as staying indoors and avoiding contact with electrical appliances or metal objects.To know more about thunderstorm, click the link given below:
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#SPJ1
Answer:
It is B.---HailExplanation:
Hope this helps good day
K2S and NaOH are soluble in water or not? Explain.
Answer:
K2S and NaOH are soluble
Explanation:
Because thay have ions formed from elements
Lab: energy transfer
What is the purpose of this lab?
What procedure did you use to complete this lab?
What charts, tables, or drawings would clearly show what you have learned in this lab?
If you could repeat the lab and make it better, what would you do differently and why?
Explanation:
if you could repeat a lab and make it better the first thing is to get more people inside to help you study and find evidence. that matches and make sure your guess is right before sending out false info
what is electronegativity and how can it be used in determining the polarity of nonpolar
Answer:
See explanation
Explanation:
Electro negativity refers to the ability of an atom in a molecule to attract the shared electrons of a bond towards itself.
Electro negativity is a property of elements. It increases across the period and decreases down the group in the periodic table.
When two elements with differing electronegativities form a bond, the atom that has a greater electro negativity tends to pull the shared electrons of the bond towards itself. By so doing, there is greater electron density around that atom compared to the other atom. The more electronegative atom therefore acquires a partial negative charge while the other atom acquires a partial positive charge. This leads to a dipole in the molecule.
A molecule is said to be polar when it possess a dipole, that is, a positive end and a negative end. This phenomenon in turn arises when there is a significant difference in electro negativity between two atoms that compose the bond.
For instance, consider the formation of HF. Hydrogen has an electro negativity of 2.2 while fluorine has an electro negativity of 3.98. The difference in electro negativity between the both atoms is about 1.78. The molecule is polar with the negative end of the dipole at fluorine and the positive end at hydrogen.
Which is the best term to use when describing the energy of motion?
CORO
chemical
kinetic
potential
thermal
Answer:
kinetic
Explanation:
WILL GIVE BRAINLIEST- What is the % of each element in Al2(CrO4)3
Answer:
Al = 13.4% Cr = 38.8% O = 47.7
Aluminium Chromium Oxygen
Explanation:
im so sorry if i am wrong
Oxides are:
A. Products formed during combustion
B. Products formed during double replacements
C. Reactants in combustion
D. Only formed during complete combustion
Answer:
only formed during complete combustion
Explanation:
ex:c+o2=co2 then it is a oxide
using the Polymers: A Property Database provide the following
properties for high density Polyethylene (use HDPE): Density, Specific Heat Capacity, and Melting Temperature.
Polyethene is a polymer composed of repeating units of the monomer ethene.
The properties of polyethene are as follows:
density- ranges 0.857 g/cm3 to 0.975 g/cm3.specific heat capacity is 1.9 kJ/kg.melting temperature is approximately 110 °C.What are polymers?Polymers are large macromolecules consisting of long repeating chains of smaller molecules known as monomers.
An example of a polymer is polyethene composed of repeating units of the monomer ethene.
The density of polyethylene ranges 0.857 g/cm3 to 0.975 g/cm3.
The specific heat capacity of polyethene is 1.9 kJ/kg.
The melting temperature of polyethene is approximately 110 °C.
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Determine the number of KNO3 molecules in 0.750mol KNO3
The number of KNO3 molecules in 0.750 mol of KNO3 would be 4.52 x [tex]10^{23}[/tex] molecules
Number of moleculesThe number of molecules of a substance is defined by Avogadro's constant, such that:
1 mole = 6.022 x [tex]10^{23}[/tex] molecules
In this case, the number of mole is 0.750
Thus, the number of molecules in 0.750 moles of KNO3 can be calculated as:
0.750 x 6.022 x [tex]10^{23}[/tex] = 4.52 x [tex]10^{23}[/tex] molecules
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Differentiate bonding and non-bonding electrons?
Answer:
bonding electrons are when the electron have the same number and the connect,like valence electrons. Non-bonding electrons are only possible when an atom is unstable, no more than 2 electrons or if the atom is an isotope. bonding electron pairs occur in a covalent bond between two atoms. they include one electron from each atom in the covalent bond. non-bonding pairs do not take part in bonding. they are the left over electrons in the outter shell of the atom.
PLEASE MARK AS BRAINLIEST IF YOU FOUND THIS AS HELPFUL
Explanation:
Read more here:
https://brainly.com/question/24605449
Why is it so many numbers
Answer:
Bro what numbers? And whats the question?
Challenge: Make another comparison.
Earth's outer layer is like because...
Answer:
Imagine that the planet is an onion. When you open it, you will discover that it can be separated into layers that are perfectly independent from each other, but that they make sense if they are united. The central part of the onion is different, almost circular.
Explanation:
The center of the planet is known as the nucleus. This layer is shaped like a sphere, and in turn is made up of two layers: the inner core (where the temperature reaches up to 5000 degrees Celsius) and the outer core (whose consistency is semi-liquid). The core is made up of nickel, iron, sulfur, oxygen, and copper.
Thorium-234 decays by alpha emission to form a new nuclide. Identify the new nuclide.
42. Water is a neutral solution, what is the pH of water?
O pH = 7
pH = 6
pH = 2
pH = 10
Single-celled organisms that do not contain their genetic material in a
nucleus are called
Answer:
A prokaryotic cell is a simple, single-celled (unicellular) organism that lacks a nucleus, or any other membrane-bound organelle. We will shortly come to see that this is significantly different in eukaryotes. Prokaryotic DNA is found in the central part of the cell: a darkened region called the nucleoid.
Explanation:
HiH
Answer:Prokaryotes
Explanation:Prokaryotes are organisms whose cells lack a nucleus and other organelles. Prokaryotes are divided into two distinct groups: the bacteria and the archaea, which scientists believe have unique evolutionary lineages. Most prokaryotes are small, single-celled organisms that have a relatively simple structure.
Consider this chemical reaction. What chemical is reduced?
CH3OH + NAD --> CH2O + NADH
Answer:
CH3OH and NADH
Explanation:
The given chemical reaction is an redox reaction in which reduction and oxidation take place.
In the process of oxidation: electrons are loss while in the process of reduction: electrons are gained.
In the given redox reaction: CH3OH + NAD --> CH2O + NADH
NAD is reduced to NADH as NADH gains one hydrogen electron while CH3OH (methanol) is oxidized to CH2O (methanal) by losing electrons.
So, CH3OH (methanol) and NADH are the reduced forms while NAD and CH2O (methanal) are oxidized forms.