How many unique c13 nmr signals exist in the spectrum for the compound?.
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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Where are the halogens located on the periodic table.
Answer:
The seventh group
Explanation:
The halogens consist of the elements: F, Cl, Br, I, At, and Ts
From the addition of water to the molecule of an alkene is obtained a product containing 21.6% O2. Write the addition reaction. CH3-CH
Addition reaction between water molecules and alkene molecules produces alcohol.
What is addition reaction?Addition reaction generally takes place across the unsaturated carbon compounds.
When water molecule (H₂O) is added to the alkene which may be ethene (C₂H₄) molecule then formation of product i.e. ethanol (CH₃CH₂OH) takes place through the addition of hydrogen and hydroxyl group across the double bond. And reaction is shown in the attached image.
Hence formation of alcohol product takes place.
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Which statement best describes the relationship between kinetic energy, mechanical energy, and potential energy?
A.
Kinetic energy is part of mechanical energy, but potential energy is not.
B.
Kinetic energy is part of potential energy, but mechanical energy is not.
C.
Kinetic energy and potential energy are the two kinds of mechanical energy.
D.
Kinetic energy and mechanical energy are the two kinds of potential energy.
Answer:
C
Explanation:
because kinetic and potential are both parts of mechanical energy
you should know we learned it in class
Which group of elements is not usually reactive with any other elements?.
Answer: Nobel Gasses
Explanation:
What is the molecular geometry, or shape, of phosphorus trichloride (PCl3)?
Answer:
trigonal pyramidal
Explanation:
Looking at the PCl3 molecular geometry it is trigonal pyramidal with a bond angle of approx. 103o. The is mainly due to the disproportionate influence or greater repulsion of the phosphorus lone pair which makes it deviate from the ideal angle of 109o.
Answer:
I believe the molecular geometry of PCL3 would be trigonal planar.
Explanation:
When the heat moves from one place to another by the tendency of density, therma
energy is transferred by the process of
O convection
O radiation
O conduction
O evaporation
Answer:
The answer is A. Convection
Explanation:
Convection is single or multiphase fluid flow that occurs spontaneously due to the combined effects of material property heterogeneity and body forces on a fluid, most commonly density and gravity (see buoyancy). When the cause of the convection is unspecified, convection due to the effects of thermal expansion and buoyancy can be assumed. Convection may also take place in soft solids or mixtures where particles can flow.
What is the percentage of oxygen in air?
Which base has the smallest base dissociation constant?
A. calcium hydroxide
B. ammonia
C. potassium hydroxide
D. sodium hydroxide
Answer:
D. ammonia, because the other three are the only three strong bases in the world (we do not need to memorize base dissociation constant for the test, we just need to know the three strong bases)
Explanation:
q u i z l e t
1. 5.8g of lithium bromide is dissolved in water to make a 270 L solution. Express the concentration in ppm.
Complete the word equation for the neutralisation reaction: sodium hydroxide + __________ → sodium chloride + water
Answer:
Hydrochloric Acid
Explanation:
NaOH + HCl = NaCl +H2O
In a Neutralization reaction a base (NaOH) and an acid (HCl) react together to form neutral products. H2O is always a product and a salt is also produced such as KCl or in this case NaCl.
The Na switches with the H to form NaCl.
and the 2 H and the O create H2O.
The neutralization reaction for this is Sodium Hydroxide + Hydrochloric acid → Sodium Chloride + Water.
What is Neutralization Reaction?Neutralization is a type of chemical reaction in which an acid and a base react with each other. In this reaction, neutralization results in the formation of any type of salt and water.
The proton ([tex]H^+[/tex]) from the acid combines with the hydroxide ([tex]OH^-[/tex]) from the base to make water [tex](H_2O)[/tex]. This type of reaction is known as neutralization reaction because it neutralizes the acid and base. If a strong acid and strong base react completely, then the resulting solution will have a pH of 7 (neutral).
For above given example,
Sodium Hydroxide is reacted with Hydrochloric acid to form Sodium Chloride and Water.
Thus, the neutralization reaction for this is Sodium Hydroxide + Hydrochloric acid → Sodium Chloride + Water.
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giving 30 points!! please help <3
Answer:
below :)
Explanation:
Bones, droppings, and other dead matter
Energy storage molecules, cellular respiration
Process, energy
Oxygen, energy storage molecules, energy, carbon dioxide
Cellular respiration, carbon
Carbon, nitrogen
Nitrogen
Decomposers, ecosystem
Summarize how the structure of organic compounds allows them to function as pigments in 2 – 3 sentences
Answer:
Biochemistry is the discipline that studies the chemistry of life, and its objective is to explain form and function based on chemical principles. Organic chemistry is the discipline devoted to the study of carbon-based chemistry, which is the foundation for the study of biomolecules and the discipline of biochemistry. Both biochemistry and organic chemistry are based on the concepts of general chemistry, some of which are presented in Fundamentals of Physics and Chemistry Important to Microbiology.
Explanation:
I will give an brainlist and a lot of points of who ever does this correctly.
Answer:
active energy
*Energy associated with something moving or changing in some way
potential energy
potential energy *stored energy that depends upon the relative position of various parts of a system
similarities between active and potential energy
*they can both be converted into each other's form of energy
What is the general formula for a secondary amine? rnh2 h2nrnh2 rn2h r2nh
The general fomula of the amine group ought to be R2NH because, the two hydrogen atoms of ammonia have been substituted by alkyl groups.
What is a secondary amine?A secondary amine is one in which two alkyl groups are subtituted on the nitrohen atom of ammonia.
This implies that the general fomula of the amine group ought to be R2NH. This is because, the two hydrogen atoms of ammonia have been substituted by alkyl groups.
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Answer:
D
Explanation:
NEED ANSWER IN QUICK! HELPPPPPPP
What is true of a sample of gas particles as the temperature decreases? (3 points)
The particles move faster, and their average kinetic energy decreases.
The particles move faster, and their average kinetic energy increases.
The particles move slower, and their average kinetic energy decreases.
The particles move slower, and their average kinetic energy increases.
B. The particles move faster, and their average kinetic energy increases.
Hope this helps :))
The sample of gas particles as the temperature decreases particles move slower, and their average kinetic energy decreases. option C is correct.
What are gas particles?
Every matter in this universe consist of small particles and gas also have small particles which are spherical in shape and collide with each other to move in zig zag form.
As temperature decreases the particles will move slow because of low energy as temperature is the source of energy for them and the collision between them also decreases due to which kinetic energy will also decreases.
On increasing the temperature the gas molecules move fast and kinetic energy will also be more.
Therefore, sample of gas particles as the temperature decreases particles move slower, and their average kinetic energy decreases. option C is correct.
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Can someone please help me? :(
Answer:
I would say D.
to get a higher pressure under water you need to go lower
:)
A student is planning an investigation to explore different properties of matter.
Which investigation will help the student explore a physical property of matter?
Answer:
Looking for certain physical properties.
Explanation:
These properties include color, size, mass, luster, etc.
Weighing the item is a common way to find one physical property, mass.
There is enough food for about 150 wolves in Yellowstone National Park. This is the __________ of wolves in the park
Carrying Capacity
Explanation:Carrying capacity is defined as the number of organisms that can survive in an environment based on the supplies in the area.
Carrying Capacity Limits
There are multiple variables that can affect carrying capacity. Some of the most common ones are food, water, and space. There is a limited amount of all of these things, which means that the environment can only support a specific amount of organisms. In this case, there is enough food for 150 wolves; thus the carrying capacity is 150.
Changes in Carrying Capacity
Carrying capacity can change throughout time. If the amount of food, water, or space increases, then the carrying capacity will as well. The opposite is also true. So, if suddenly there was enough food for 200 wolves, the carrying capacity would become 200.
True of false When sugar dissolves in water, water particles pull sugar particles off the sugar crystal
Answer:
Answer is True
Explanation:
Hi! This is a science question...
Which of the following is NOT an example of acceleration?
speeding up
slowing down
remaining at rest
stopping
Answer:
C: remaining at rest
Explanation:
Acceleration (a) is the change in velocity (Δv), remaining at rest is not changing the velocity.
Which best states how turner’s internal conflict is connected to the setting? turner feels stifled in the town but free in the open air of the beach. turner feels used to the town but unsure of himself on the beach. turner feels there is a lot to do in the town but not much to do at the beach. turner feels criticized by people in the town but criticized by god at the beach.
Turner internal conflict is connected to the setting through him feeling stifled in the town but free in the open air of the beach which is option A.
What is a Conflict?This is when an individual is not in agreement with one another or having a contradictory feeling.
In this case, Turner feels stifled in the town but free in the open air of the beach which are contradictory and the reason for his internal conflict.
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Answer:
Turner feels stifled in the town but free in the open air of the beach.
Explanation:
Correct on Edge
Which of the following correctly represents the radioactive decay of cesium-137?
A sample of methane gas that has a volume of 3.8 L at 5°C is heated to 86°C at constant pressure. Calculate its new volume.
According to the Charle's law as pressure is constant the new volume of gas is 4.907 L.
What is Charle's law?Charles law is an experimental gas law which provides description about the behavior of gases which tend to expand on heating.It states that, at constant pressure, the temperature is in direct proportion with the volume that is,V∝T or V₁/T₁=V₂/T₂.The relation between volume and temperature is linear as the temperature increases volume also increases.
The graph of volume versus temperature is a straight line passing through the origin.The law was proposed by Jacques Charles , a french physicist in 1780.
In the given problem , on substituting values in above formula, V₂=3.8×278/359=4.907 L.
Thus , the new volume of methane gas is 4.907 L.
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Which is best represented by the equation?
2Mg + O2 eq190715_s1 2MgO
A.
Law of Conservation of Energy
B.
Law of Conservation of Mass
C.
Law of Superposition
Answer:
B - Law of Conservation of Mass
Explanation:
was the right answer for me
ACELLUS LAB-ACID BASE TITRATION
a student overshot the equivalence point when he was using NaOh to determine the concentration of an unknown acid, HA. What ions are present in the purple solution in the flask?
Answer: A-, NA+ And OH-
Explanation: Thank me later
What is the volume of a 4M solution with that has 17.2 moles?
Answer: 4.3 L
Explanation:
molarity = (moles of solute)/(liters of solution)
4 = 17.2 / liters of solution
volume = 17.2/4 = 4.3 L
Potassium carbonate (K2CO3) has one potassium atom bonded to carbon, and that carbon is also bonded to three oxygens. Their electronegativities are shown in the list:
K 0.82
C 2.55
O 3.44
How would you describe the bonds (K-C and C-O) in this molecule?
A: K-C is polar covalent, and C-O is nonpolar covalent.
B: K-C is ionic, and C-O is nonpolar covalent.
C: K-C is ionic, and C-O is polar covalent.
D: K-C is polar covalent, and C-O is polar covalent.
Answer:
I'm not all the way sure but I think it is C
Explanation:
The reason is because an ionic bond essentially donates an electron to the other atom participating in the bond. Also, the C-O I think is polar since it is evenly distributed.
Based on the electronegativity difference between them, K-C is ionic, and C-O is polar covalent.
What is a bond?A bond is formed by the interaction of two atoms. A bond can be either ionic or covalent.
Now we have to look at the electronegatives on each bond. The electronegativity difference between the K-C bond is larger than that between the C-O bond hence, K-C is ionic, and C-O is polar covalent.
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What is the empirical formula of a compound that is 41.4% Strontium, 13.24%
Nitrogen, and 45.3696 Oxygen ?
Answer:
Empirical Formula N2O6Sr Strontium Nitrate
Explanation:
N=13.2% O=45.4% Sr=41.4%
How are plant cells different from animal cells?
Select the three correct statements.
They can convert the sun's energy into food.
They cannot make their own food.
They have chloroplasts.
They can move around.
Their cells have cell walls.
Answer:
A D E hope it helps. have a great day