11.In 13C NMR spectroscopy, the signal due to this type of carbon occurs furthest downfield.A)–CºNB)C)D)E)–CºC–
Answer:
C=O
Explanation:
The nuclear magnetic resonance (NMR) spectroscopy is a method that employs the technique to observe the local magnetic fields are atoms. This analytical technique exploits sufficient differences in the frequency of nuclear magnetic resonance in protons and atoms within organic compounds that depend on their neighboring atoms.
Amongst all the given options, the carbonyl is the right option because the carbon is doubly bonded to the oxygen and the hybridization of this double bond is sp² hybridized, as a result, the electron density at the carbon possess a lower amount in order to have more magnetic field.
The increasing order of these chemical shifts are as follows:
C - X < [tex]\mathbf{C -O }[/tex]≅[tex]\mathbf{ \mathrm{-C\equiv C-}}}[/tex] < -C≡N < C=O
A certain substance X has a normal freezing point of −3.1°C and a molal freezing point depression constant =Kf·6.23°C·kgmol−1. Calculate the freezing point of a solution made of 12.3g of urea NH22CO dissolved in 300.g of X. Be sure your answer has the correct number of significant digits.
Answer:
Freezing T° of solution = - 7.35 °C
Explanation:
This is about the freezing point depression, a colligative property which depends on solute.
The formula is: Freezing T° pure solvent - Freezing T° solution = m . Kf . i
Freezing T° of pure solvent is -3.1°C
At this case, i = 1. As an organic compound the urea does not ionize.
We determine the molality (mol/kg of solvent)
We convert mass to moles:
12.3 g . 1mol / 60.06 g = 0.205 moles
0.205 mol / 0.3 kg = 0.682 mol/kg
We replace data in the formula:
-3.1°C - Freezing T° of solution = 0.682 mol/kg . 6.23 kg°C/mol . 1
Freezing T° of solution = 0.682 mol/kg . 6.23 kg°C/mol . 1 + 3.1°C
Freezing T° of solution = - 7.35 °C
Which of the following is true concerning y? A) wdescribes the probability of finding an electron in space. B) ya describes the exact path of electron motion in an orbital. C) w? describes the electronic structure of the atom according to the Bohr model. D) w describes the exact volume of an atom. E) w2 describes the size of an atom.
Answer:
wdescribes the probability of finding an electron in space.
Explanation:
The quantum mechanical model of the atom assigns wave properties to the electron. This is in accordance with Heisenberg's uncertainty principle.
The probability of finding the electron in a given volume element is given as the square of the wave function while the wave function itself does not really have a physically significant meaning.
However, the wave function is a mathematical function that contains a detailed information about the behavior of an electron.
Which is most reactive toward electrophilic aromatic substitution?
Complete Question
Which is most reactive toward electrophilic aromatic substitution?
A Phenol
B Anisole
C Nitro-benzene
D Benzene
Answer:
The correct option is A
Explanation:
Generally the rate at which electrophilic aromatic substitution reaction occur is dependent on the nucleophilicity(nucleophile strength ) of Benzene ring.Now a functional group which increase the electron density in the benzene ring when attached to it increases its nucleophilicity and this in-turn will increase the rate at which electrophilic aromatic substitution reaction occur
Now Phenol is a compound that is made up of OH functional group and then the benzene ring
Anisole is a compound that is made up of [tex]OCH_3[/tex] functional group and then the benzene ring
Nitro-benzene is a compound that is made up of [tex]NO_2[/tex] functional group and then the benzene ring
Now since OH is the highest In series of activating group compared to the activation groups we are considering (i.e [tex]OCH_3[/tex] and [tex]NO_2[/tex] )
Then Phenol is the answer
Materials
80 mL Carbonated Water
80 mL Acetic Acid
(2) Chalk Pieces (CaCO3)
Permanent Marker
*80 mL Tap Water
*Timer (watch, cell phone, internet, etc.)
Note: You must provide the materials listed in *red.
Labware
(3) 250 mL Beakers
Digital Scale
EXERCISE 1: SPELEOLOGY (UNDERSTANDING CAVE FORMATION)
In this exercise, you will observe what happens to chalk in different solutions and compare your observations to what occurs in nature.
1. Do the results of the exercise support your hypothesis? Explain your reasoning.
2. Compare and contrast the reaction of the chalk pieces in each solution.
3. Is this exercise an analog for physical or chemical weathering? Explain your reasoning.
4. Using your observations of the chalk in different solutions, explain how a limestone cave forms.
Answer:
Limestone caves are formed when acid rain occurs.
Explanation:
When chalk pieces which is made of calcium carbonate react with acetic acid, it produces carbon dioxide, calcium acetate, and water. When calcium carbonate react with Carbonated Water produces calcium bicarbonate. Limestone cave forms when the dissolution of limestone occur when rainwater which is acidic due to the addition of carbondioxide in the air react with limestone. This dissolution removes the lime from the rock and caves are formed.
The chalk has been made up of calcium carbonate. The reaction of calcium carbonate with different solutions results in the formation of varying products.
The reaction of chalk with acetic acid results in the formation of Calcium acetate, with the production of carbon dioxide and water.
The reaction of chalk with carbonated water results in the formation of calcium bicarbonate.
The limestone caves has been formed by the dissociation of limestone with reaction of acid, forming carbon dioxide.
The formation has takes place in the acidic solution, and carbon-dioxide thus the resultant can be due to the acid rain.
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Discuss the effect of changing the flow tube radius on flow rate.
Answer:
The flow rate of a tube is the volume of fluid flowing through the tube per unit time. The flowrate is proportional to the product of the velocity of the fluid through the tube, and the cross-sectional area of the tube.
That is
Q = AV
where
A is the area of the tube
V is the velocity of the tube
The cross-sectional area of the tube is proportional to the radius of the tube. From the above equation, we can deduce that if the velocity of the fluid flowing through the tube is held constant, the flowrate of the fluid through the tube will increase with an increase in the radius of the tube, and it will decrease with a decrease in the radius of the tube.
Enzymes which are usually increase the rate of a reaction by________.
How can pH go high over time
Factors that raise pH in a swimming pool. 1. Natural pH Rise: Carbon Dioxide Loss. The chemistry of pH sounds a lot more complicated than it is. In short, the less CO 2 in solution, the ... 2. Sanitizers and their pH Impact. 3. pH and alkalinity adjustment chemicals.
Element T exists as three isotopes: T-12 (98.90%), T-13 (1.00%) and T-14 (0.10%). Calculate the
average atomic mass of the element T.
Answer choices:
- 12.01 amu
- 11.72 amu
- 1200 amu
- 13 amu
Answer:
-10.00amu
ok.......... !!!!!
The average atomic mass of the element T is 12.012 amu.
What is average atomic mass?The average atomic mass is defined as the atoms' weighted average mass in a naturally occurring sample of the element.
It is also defined as the average atomic mass of all naturally occurring isotopes of all elements.
The average atomic mass can be expressed as
Average atomic mass = f1m1 + f2m2 + f3m3
= 0.989 x 12 + 0.01 x 13 + 0.001 x 14
= 11.868 + 0.13 + 0.014
= 12.012 amu
Thus, the average atomic mass of the element T is 12.012 amu.
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Because a gas has no definite volume or shape, in what way does it take up space? (2 points)
Group of answer choices
By taking the volume of a solid
By taking the volume of a liquid
By taking the shape of its container
By taking the volume of its container
Answer:
By taking the volume of the container.
Answer:
By taking the volume of the container
Explanation:
it does not have any specific volume or shape, so the way it volume is the volume of container.
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What is the term for a solution that is holding more dissolved solute than it should be able to at a particular temperature?
Explanation:
Sometimes, a solution contains more dissolved solute than is normally possible. This type of solution is said to be supersaturated. A saturated solution can become supersaturated if more solute is added while the temperature is raised.
hope it will help u ✌️
PLEASE HELP ME, I have no idea how to do this :(
Answer:
molar mass: 151.165
Explanation:
mass of Carbon is 12.011 amu
mass of Hydrogen is 1.008
mass of Nitrogen is 14.007
mass of Oxygen is 15.999
you make the calculations like this...
[tex](12.011 \times 8) + (1.008 \times 9) + (14.007) + (15.999 \times 2) = 151.165amu[/tex]
i am timed please help
Answer:
mixture
Explanation:
there was leftover components meaning there was something mixed into the liquid
The element X has three naturally occurring isotopes. The isotopic masses (amu) and % abundances of the isotopes are given in the table below. Calculate the average atomic mass of the element in amu. PLEASE HELP ASAP
Answer:
162.349
Explanation:
(.3060 * 159.37) + (.1579 * 162.79) + (.5361 * 163.92) = 162.349
What has 2 protons and 2 neutrons in the center of the atom
Answer:
HELIUM
Explanation:
HELIUM HAS 2 PROTON I
Brian's aunt has cats. When Brian recently visited her, he started sneezing badly and believes that it was because
he is allergic to cats.
What would be the next step for Brian to form a hypothesis?
O by avoiding going to his aunt's house
by wearing a nose mask near cats
by visiting other households with cats
O by visiting his aunt's house again with the cats outside
Answer:
By visiting other households with cats.
Explanation:
This will give Brian a variety of other houses and determine if it is truly cats or just alleries from other items. This is the most direct way to get Brian the answer he is looking for.
Answer:
c
Explanation:
i just did it
what would happen to the solvent if a reaction was refluxed without a condenser
Answer:
Solvent will be lost as gas and not return into the vessel via condensation.
Explanation:
Reflux is a technique used in chemistry to boil a particular solvent and convert the gas formed back into liquid by condensation. This technique allows a solvent to be heated at a regulated temperature but for a prolonged period of time than it would normally take place.
The reflux procedure makes use of a reflux CONDENSER, which is an apparatus that allows vapour from the heating/boiling to flow back into the reaction vessel. The CONDENSER functions to prevent the loss of the SOLVENT as vapour by providing a cooling effect on the vapour.
Therefore, if a reaction was refluxed without a condenser, THE SOLVENT WILL BE LOST AS VAPOUR
what is Corona virus And explain breifly in
Answer:
it is a viral disease . it is infected by one person to other .
Not divisible
O atom
O compound
O mixture
O solution
Answer:
mixture or atom
Explanation:
I HOPE IT WILL HELP YOU
Explanation:
and ,answer is mixture.
what is zirconium electron configuration
kr,5s2,4d2
Explanation:
as itis in the 2nd transition series
The density of ice is 0.917 g/cm3. What volume of ice does 52.75 g occupy?
Answer:
The answer is
57.52 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} [/tex]
From the question
mass of ice = 52.75 g
density = 0.917 g/cm³
The volume of the ice is
[tex]volume = \frac{52.75}{0.917} \\ = 57.52453653[/tex]
We have the final answer as
57.52 mLHope this helps you
Using the molecular weight (96.2 g/mol) determine the amount of mmol of (3S)-3,4- dimethylpentyne. Round to the tenths place.
Answer:
2.0 mmole
Explanation:
The computation fo the amount of mmol is shown below:
As we know that
[tex]Mole = \frac{Given\ mass}{molar\ mass}[/tex]
where,
Given mass is 0.2 gm
The Molar mass is 96.2g/mol
Now
put these values to the above formula
So,
[tex]= \frac{0.2}{y96.2} \\\\= \frac{1}{481} mole[/tex]
Mile mole is
[tex]= \frac{1}{481}\times 1,000[/tex]
= 2.079
= 2.0 mmole
As
mole = 1,000^-1 mili mole
We simply applied the above formula so that the amount of mmole could come
Which action changes the identity of substance referenced
Answer:
When iron turns to rust, the chemical identity of the iron changes. When you break ice, the ice is still ice
Determine the equilibrium expression for the following reaction:
2NaHCO3(s)⇋Na2CO3(s)+H2O(g)+CO2(g)
Answer:
K = [Na2CO3] [H2O] [CO2] / [NaHCO3]²
Explanation:
2NaHCO3(s)⇋Na2CO3 (s) + H2O(g) + CO2(g)
To write an expression for equilibrium constant, K, for the above reaction, it is important that we have an idea of what equilibrium constant is all about and how we can determine it.
Equilibrium constant for a reaction is simply defined as the ratio of the concentration of the product raised to their coefficient to the concentration of the reactant raised to their coefficient.
Thus the expression for the equilibrium constant for the above equation can be written as follow:
K = [Na2CO3] [H2O] [CO2] / [NaHCO3]²
What is the average pressure exerted by the molecules on the walls of the container?
Answer:
This question appears to be incomplete
Explanation:
However, we know that one of the kinetic theories of gases is that gas molecules collide with one another and against the walls of the container (in which they are stored); hence exerting there pressure on the walls of this container.
Ideal gases are the most suitable for this theory because it's molecules are far apart and do not exert any attractive forces towards one another; hence it's molecules move "undisturbed" or "freely". For ideal gases, the average pressure exerted by by the gas molecules on the walls of the container can be calculated as
PV = nRT
Where P = pressure (in atmosphere, atm or kilopascal, KPa or millimeter mercury, mmHg)
V = volume (in liters)
n = number of molecules
R = ideal gas constant (8.3145 J·mol⁻¹·K⁻¹)
T = temperature (in kelvin)
If you were running an experiment to determine the temperature at which beans sprouted (germinated) the fastest, what would be the outcome (dependent variable)?
Answer:
Temperature on beans sprouted
Explanation:
The variable amount is the amount that changes continuously. We calculate the sprout of the bean at which temperature it is sprouting rapid, in that case, the temperature acts as a variable amount.Which statement correctly defines pasteurization?
Answer:
Pasteurization is the process by which liquids are heated to kill bacteria that may be present.
explanation I got the correct answer
Answer:
Pasteurization is the process by which liquids are heated to kill bacteria that may be present.
Explanation:
i just did that one
An aluminum cylinder has a radius of 3.2 cm and a length of 8.6 cm. What is the mass of the aluminum cylinder if aluminum has a density of 2.7 g/cm3?
please help :)
Answer:
750g of Aluminum
Assuming 8.6 cm lenth is the height of the cylinder. The volume of a cylinder is: V = [tex]\pi[/tex]*r^2*h
V = 3.14cm x 10.24cm x 3.6cm
V = 280cm^3
Now density = mass/volume
2.7g/cm^3 = mass/280cm^3
2.7g/cm^3 x 280cm^3 = mass/280cm^3 x 280cm^3
= 750g of Aluminum
Which lists the waves in order of frequency, from highest to lowest?
O X-rays, gamma rays ultraviolet
O radio waves, visible light, X-rays
O ultraviolet, microwaves, gamma rays
O visible light, infrared, microwaves
Visible light, infrared, microwaves. This is the waves in order of frequency, from highest to lowest. Therefore, the correct option is option D.
What is electromagnetic wave?
One of the various ways that energy moves through space is electromagnetic radiation. Electromagnetic radiation includes the heat from a blazing fire, the sun's light, the X-rays your doctor uses, and the energy used it to cook food inside a microwave. Although though these energies may appear to be very different from each other, they are connected by the fact that they all have characteristics of waves.
The amplitude of a wave is the vertical line between both the tip of the crest and the wave's axis. This is the characteristic linked to the wave's brightness or intensity. The wavelength of a wave is the horizontal separation of two succeeding crests or troughs. Visible light, infrared, microwaves. This is the waves in order of frequency, from highest to lowest.
Therefore, the correct option is option D.
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what is the balanced chemical equation when solid calcium oxide and carbon dioxide gas are formed by the decomposition of solid calcium carbonate (CaCO3)