Answer:
A. any absorbance of light by the solvent AND the cuvette needs to be accounted for
Explanation:
Blank calibrations are usually carried out on the spectrometer to eliminate and account for any readings that would come from absorptions of the curvette, solvents/reagents or anything that is not the main analyte we are testing for.
Hence the blank solution does not contain the analyte itself. Fingerprints should be removed from the curvette as practice. Hence the most suitable answer amongst the options is A.
I hope this was clear ad most of all, helpful.
The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.
For performing the spectroscopic measurement of an analyte, the system has been blanked with the cuvette and the solvent. This has been performed as the solvent medium, the environment and the cuvette have their own absorption.
The analysis of the analyte without performing blank has consisted of the absorbance of the solvent and cuvette as well. Thus, in order to attain a pure analyte absorbance, the spectrometer has been analyzed with the blank.
The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.
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The following questions apply to the Electrophilic Aromatic Substitution (EAS) Nitration of Methyl Benzoate which yields Methyl m-Nitrobenzoate as the product:1) Draw and name the other possible EAS mono-nitration products that may be formed in addition to the desired methyl m-nitrobenzoate.2) If you perform an EAS nitration reaction with methyl m-nitrobenzoate as the reactant, which isomer is the major product? (At which ring position do you expect substitution to occur?) Draw and name the expected product.3) Suggest two ways to determine if the impure methyl m-nitrobenzoate (before recrystallization) contains other substitution products as impurities.4) Discuss differences you'd expect to see in IR, 1H and 13C NMR spectra of methyl benzoate vs. methyl m-nitrobenzoate that are consistent with the formation of the product in this procedure.
Answer:
Explanation:^^
EAS reaction has been the reaction in which the Hydrogen atom of the aromatic ring has been replaced or substituted by the electrophilic group at the ortho, para, or meta position.
1. The reaction of Nitration of methyl benzoate will yield, methyl m- nitrobenzoate as the major product.
The minor products in the reaction will be the dinitro products. The mono nitration product will be
methyl o-nitrobenzoatemethyl p-nitrobenzoate.2. The major product formed with the nitration of methyl meta nitrobenzoate has been the dinitro product.
3. The impurity in the methyl m nitrobenzoate can be determined with the determination of the melting point of the compound. The presence of the impurity will change the melting point of the product.
The purity can be determined with the proton NMR analysis, to confirm the product.
4. The difference expected in the NMR spectra of methyl benzoate and methyl m-nitrobenzoate has been the peaks with the methyl benzoate are predominated in the spectra will in the nitro compound, the peaks have been varied with the pi transitions in the structure.
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protons
neutrons
atomic symbol
atomic number
chemical element
Atoms are tiny pieces of matter that make up all the substances around you. All atoms
contain one or more positively charged particles called
, which are
found in an atom's nucleus. In many atoms, the nucleus also contains
which have no electrical charge. There are also small, negatively
charged particles called electrons found outside the nucleus. Together, these three types
of particles make up the structure of atoms.
The number of protons in an atom is the atom's
When two atoms
have the same atomic number, they are are classified as the same
All known chemical elements are listed in the periodic table, where they are arranged by
atomic number. The periodic table contains information about each element, often
including a short version of the element's full name called its
Calculate the concentrations of H3O(+) and SO4(2-) in a solution prepared by mixing equal volumes of 0.2M HCl and 0.6M H2SO4.
Answer:
[H₃O⁺] = 0.7M
[SO₄²⁻] = 0.3M
Explanation:
The HCl in solution produce 1mole of H₃O⁺ and H₂SO₄ produce 2 moles of H₃O⁺.
When two solutions are mixing in equal volumes, the concentrations of both reactants is halved regard to their initial concentrations. That is:
HCl = 0.1M
H₂SO₄ = 0.3M
And H₃O⁺ will be:
0.1M + 2*0.3M = 0.7M
And SO₄²⁻ comes just from H₂SO₄, that means:
[H₂SO₄] = [SO₄²⁻] = 0.3M
If 10.0 g of NaF and 15.0 g of HF are dissolved in water to make 2.0 L of solution, what is the pH of the resulting solution?
Answer:
2.68
Explanation:
Step 1: Calculate the molar concentrations of the solutes
We will use the following expression.
M = mass of solute / molar mass of solute × liters of solution
[HF] = 15.0 g / 20.01 g/mol × 2.0 L = 0.37 M
[NaF] = 10.0 g / 41.99 g/mol × 2.0 L = 0.12 M
Step 2: Calculate the pH of the solution
We have a buffer system formed by a weak acid (HF) and its conjugate base (F⁻ coming from NaF). We can calculate the pH of the solution using Henderson-Hasselbach equation.
pH = pKa + log [F⁻]/[HF]
pH = 3.17 + log (0.12 M/0.37 M)
pH = 2.68
The pH of the resulting solution is 2.68.
What is pH?pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.
Step 1: Calculate the molar concentrations of the solutes
M = mass of solute / molar mass of solute × liters of solution
[tex]\rm [HF] = \dfrac{15.0 g}{20.01 g/mol } \times 2.0 L = 0.37 M[NaF] = \dfrac{10.0 g}{ 41.99 g/mol} \times 2.0 L = 0.12 M[/tex]
Step 2: Calculate the pH of the solution
pH = pKa + log [F⁻]/[HF]
pH = 3.17 + log (0.12 M/0.37 M)
Thus, the pH of the resulting solution is 2.68
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A sample of krypton gas collected at a pressure of 1.31 atm and a temperature of 26.0°C is found to occupy a volume of 23.3 liters
Mol of Kr gas = 1.244
Further explanationIn general, the gas equation can be written
PV=nRTwhere
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08205 L.atm / mol K
T = temperature, Kelvin
P=1.31 atm
V=23.3 L
T=26+273=299 K
mol of sample :
[tex]\tt n=\dfrac{PV}{RT}=\dfrac{1.31\times 23.3}{0.08205\times 299}=1.244[/tex]
What happens when an atom becomes to gain a -1 charge it will
when an atom gains or loses an electron, it becomes an ion. Ions formed by the loss of an electron have a positive charge, and those formed by gaining an electron have a negative charge. Positive ions are called cations, and negative ions are called anions.
200.0 grams of an organic compounds known to contain 98.061 grams of carbon, 10.381 grams of hydrogen, 32.956 grams of oxygen and the rest is nitrogen. what is the empirical formula of the compound? what is the molecular formula of the compound if its molar mass is 194.101?
Answer:
1. The empirical formula is C₄H₅N₂O
2. The molecular formula is C₈H₁₀N₄O₂
Explanation:
The following data were obtained from the question:
Mass of compound = 200 g
Carbon (C) = 98.061 g
Hydrogen (H) = 10.381 g
Oxygen (O) = 32.956 g
Empirical formula =?
Molecular formula =?
Next, we shall determine the mass of nitrogen in the compound. This can be obtained as follow:
Nitrogen (N) = 200 – (98.061 + 10.381 + 32.956)
Nitrogen (N) = 200 – 141.398
Nitrogen (N) = 58.602 g
1. Determination of the empirical formula of the compound.
C = 98.061 g
H = 10.381 g
O = 32.956 g
N = 58.602 g
Divide by their molar masses
C = 98.061 /12 = 8.172
H = 10.381 /1 = 10.381
O = 32.956 /16 = 2.060
N = 58.602 /14 = 4.186
Divide by the smallest
C = 8.172 /2.060 = 4
H = 10.381 / 2.060 = 5
O = 2.060 / 2.060 = 1
N = 4.186 / 2.060 = 2
Thus, the empirical formula of the compound is C₄H₅N₂O
2. Determination of the molecular formula of the compound.
Empirical formula of the compound => C₄H₅N₂O
Molar mass of compound = 194.101 g/mol
Molecular formula =.?
[C₄H₅N₂O]n = 194.101
[(12×4) + (1×5) + (14×2) + 16]n = 194.101
[48 + 5 + 28 + 16]n = 194.101
97n = 194.101
Divide both side by 97
n = 194.101 /97
n = 2
Molecular formula => [C₄H₅N₂O]n
=> [C₄H₅N₂O]2
=> C₈H₁₀N₄O₂
__________ is required to make a wave.
Answer:
The moon is required to make a wave.
If a wave has a period of 0.25 seconds, what is its frequency?
The Lewis structure for ethyne (C₂H₂) shown below is incorrect. Starting from this structure, complete the correct structure.
Answer:
In drawing the Lewis structure for C2H2 (also called ethyne) you'll find that you don't have enough valence electrons available to satisfy the octet for each element (if you use only single bonds). The solution is to share three pairs of valence electrons and form a triple bond between the Carbon atoms in C2H2 .
Imma give 35 points cus I really need it today please.
Answer:
yes the picture is not clear
how many atoms of oxygen are contained in 160 grams if N2O3?
Answer:
3.80x1024 grams containing if not that then above 80 grams 6 grams
Explanation:
Answer:
C
Explanation:
plato
3.80 x10^24
Alpha decay please help (nuclear chemisty)
Explanation:
Given reaction:
¹⁰⁸₅₃I → ⁴₂He + ?
An alpha particle decay requires that the mass number decreases by 4 and atomic number decreases by 2.
This reaction is called nuclear fission;
The unknown compound, say Y, will have mass number and atomic number shown below;
¹⁰⁸₅₃I → ⁴₂He + ᵃₙY
Mass number; 108 = 4 + a
a = 104
Atomic number ;
53 = 2 + n
n = 51
Y will be ¹⁰⁴₅₁Y
The atomic number of the new element is 51; so, it is antimony.
¹⁰⁴₅₁Sb
1. A sealed 2500mL flask is filled to capacity with 163g of a slimy green liquid. What is the density of the liquid?
Answer:
0.065 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{163}{2500} \\ = 0.0652[/tex]
We have the final answer as
0.065 g/mLHope this helps you
Answer:
Density= mass/volume so 163/2500 = 0.0652
D= 0.0652
Explanation:
The diagram below represents the creation of a sugar solution by adding sugar to water then stirring the mixture.
+
SUGAR
WATER
SUGAR SOLUTION
Which of the following is true of this?
The mass of the sugar and water is the same as the mass of the sugar solution
The mass of the sugar and water is greater than the mass of the sugar solution
The mass of the sugar solution is greater than the mass of the sugar and water
We do not have enough information to determine anything about the mass of the sugar, water, or the sugar solution
Answer:
a it is a
Explanation:
cause i know
The creation of a sugar solution by adding sugar to water then stirring the mixture, then the mass of the sugar and water is the same as the mass of the sugar solution.
What is the solution ?A particular kind of homogenous combination made up of two or more components is known as a solution. A solute is a material that has been dissolved in a solvent, which is the other substance in the combination.
A physical process, not a chemical one, takes place when a solute and a solvent combine to produce a solution. When combined, miscible substances like gases form a single phase in all ratios. Phase-separating substances are immiscible.
When one material dissolves, or separates into another, a solution is created. A solute is the name for the material that dissolves to create a solution. A solvent is the material that a solute will dissolve in. Sugar is the solute and water is the solvent in a sugar-water solution.
Thus, option A is correct.
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True or False some synthetics are safer than their natural counterparts
Answer:
The answer is False
hope this helpes
The Heat of vaporization for NH3= 1360 J/g. Calculate the quantity of heat energy (in kJ)
needed to completely boil a 155 gram sample at its boiling point
general formula
Answer:
[tex]Q=210.8kJ[/tex]
Explanation:
Hello!
In this case, since the heat of vaporization is related with the energy required by a substance to undergo the phase transition from liquid to gas, we can compute such amount of energy as shown below:
[tex]Q=m\Delta H_{vap}[/tex]
In such a way, since the enthalpy of vaporization is given as well as the mass, we compute the energy as shown below:
[tex]Q=155g*1360J/g\\\\Q=210.8kJ[/tex]
Best regards!
The map below shows the range of three types of grasslands in the United
States. What do tallgrass prairies have that shortgrass prairies lack?
23
Blue: Shortgrass prairie
Purple: Mixed grass prairie
Green: Tallgrass prairie
A. Infertile soil
B. Cedar breaks
C. More rainfall
D. Rain shadows
Answer:
More rainfall is the correct answer.
Explanation:
a-pe/x
I (1) Did your upper lip area feel warmer or cooler? _____________________
(2) Was the stretching process endothermic or exothermic for the rubber band? ________________
(3) Explain your reasoning.
II
(4) Amount of NaHCO3 used/measured out _______________________ teaspoons
(4a) Observations on Sodium Bicarbonate
(4b) Is sodium bicarbonate water soluble? ______________
(5) Observations on Acetic Acid (vinegar) solution
(6) Observations after the addition of the first tablespoon of vinegar to the sodium bicarbonate
(7) Total amount of HC2H3O2 solution used for the reaction to go to completion _______ tbs
(8a) Overall observations on the reaction. [How was the CO2 gas production observed?]
(8b) How did you determine when the reaction was complete?
(Give at least 2 indications/observations).
(9a). Amount of NaC2H3O2 solid produced _____________________________
(9b) Observations on Sodium Acetate:
(10) Complete the balanced equations for this reaction:
(a) HC2H3O2(aq) + NaHCO3(s)
(b) H2O(ℓ) + NaC2H3O2(aq) heat
(11) Is reaction 10a above a reaction? ___________ How do you know?
If yes, what type/classification? _____________________________
(12) Is reaction 10b above a reaction? ___________ How do you know?
If yes, what type/classification? _____________________________
III (13) Yes or no (before potato)? ____________
(14) Yes or no (after potato)? ___________________
(15) Observations (signs of a reaction occurring):
(16) Potato is ________________________________
(17) Write the reaction here
(18) Type (classification) of reaction ______________________________________
IV (19) Observations on metal (after reaction)
(20) Write the reaction here
(21) Type (classification) of reaction ______________________________________
\
Answer:
no evidence of how to do the anwsers sorrry.
Explanation:
How do u draw an electron dot diagram of an aluminum atom
Answer:
you tell me
Explanation:
A typical triple bond ________. Group of answer choices consists of six shared electron pairs consists of two σ bonds and one π bond consists of one σ bond and two π bonds consists of three shared electrons is longer than a single bond
Answer:
One sigma bond and two pi bonds.
Explanation:
Triple covalent bonds between two atoms are created when they share three electron pairs. Three dashes connecting the atoms signify a triple bond. Pnictogen or the nitrogen family of atoms are those having triple valency. The correct option is C.
Two pi bonds and one sigma bond make up a triple bond. One sigma bond and one pi bond make up a double bond. Sigma bonds are usually made up of one atom. A single bond is described as a two-valence electron chemical bond between two atoms.
Covalent bonds with overlapping atomic orbitals fall under the categories of sigma and pi bonds. While pi bonds are created by the lateral overlapping of two atomic orbitals, sigma bonds are created by the head-to-head overlapping of atomic orbitals.
Thus the correct option is C.
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All bacteria contain chromosomes
True
False
Answer:
True,
Explanation:
doesn't have ends like chromosomes of eukaryotic organisms
so all bacteria contains chromosomes yes, 100%
can i have brainliest i need 2 more to get a new rank tysm
What configuration elements of sodium
The electron configuration of Sodium (Na) : 1s²2s²2p⁶3s¹
Further explanationSodium is an element with the symbol Na and has the atomic number 11. It is located in Group 1 (alkaline) and period 3
atomic number=number of electron=11
In an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
So the electron configuration for Natrium ( with 11 electrons) :
1s²2s²2p⁶3s¹ or we can write [Ne] 3s¹
Which list includes all the steps of a descriptive investigation?
O
A. Asking questions, making observations, and overcoming
limitations
a
B. Asking questions, making observations, collecting data, and
forming a conclusion
o
C. Asking questions, making observations, collecting data,
comparing, and forming a conclusion
D. Asking questions, making observations, experimenting, analyzing
data, and forming a conclusion
Answer:
i think it's C or D.
Explanation:
but if I had to choose i would pick D. sorry if it's wrong. but i hope it's right.
Answer:
D was not correct
Explanation:
How do I find the number of moles and molar mass of Gas A and Gas B with the information provided?
Answer:
A.
Explanation:
hope this helped sorry if its wrong!
James adds some magnetic marbles to a glass jar full of ordinary marbles, and then shakes up the jar.
Answer: Magnetic marbles will tend to attract each other
ana walked though this part of the forest when she passed under some low branches water drops fell on her head what most likely caused the water drops to form
Answer:
well gravity
Explanation:
gravity pull everything to earth
Maalox and Mylanta are both antacids that contain aluminum hydroxide as their active ingredient. Write the balanced equation for the neutralization of hydrochloric acid with aluminum hydroxide, Al(OH)3. Include physical states.
Answer:
3HCl(aq)+Al(OH)3(s)=AlCl3(aq)+3H2O(l)
Explanation:
This is a double replacement reaction.
Step One: Write down the compound from the name.
Aluminum Hydroxide Al(OH)3
Hydrochloric Acid HCL
Step Two: Perform the double replacement reaction.
AB+CD=AD+CB
Step Three: Balance the equation
Final step: Write in physical states.
The physical state will either be (aq), (s), (l) or (g).
When you have a two-layer mixture of water and tert-butyl methyl ether, what physical property of these liquids assures you that the ether is the top layer?
Answer:
The density.
Explanation:
The density is an intensive property of fluids, defined as mass divided by volume.
This property is directly related to the intermolecular forces that are present in the substance: the stronger the intermolecular forces, the higher the density will be, and viceversa. Therefore, organic fluids usually have lower densities than water, because the intermolecular forces in organic fluids are not as strong as in the intermolecular forcer in water (water has very stable hydrogen bonds, whereas organic fluids have van der Waals, weaker than hydrogen bonds).
The liquid that has the lower density will be the the liquid that is on the top layer. In this case, the organic compound tert-butyl methyl ether will be on top of water.
A carbon nanoparticle (very small particle) contains 8000 carbon atoms. According to the Einstein model of a solid, how many oscillators are in this block?
Answer:
24000
Explanation:
Given that:
The numbers of carbon atoms = 8000
According to the Einstein model of solid;
Einstein’s model assumes that each atom of the solid vibrates around its position of equilibrium independently of the other atoms (which amounts to neglecting the interactions between particles.
Number of oscillators = 3(8000)
Number of oscillators = 24000
The number of oscillators contained in the carbon nanoparticle is therefore: 24,000
Discussion:
Einstein model of solid postulation is as follows;
The model is characterized by an assumption that each atom of the solid vibrates around its position of equilibrium independently of the other atoms (which amounts to neglecting the interactions between particles).
In essence, the interaction between particles is ignored.
Since each atom vibrates in 3 dimensional directions;
The number of oscillators in the carbon nanoparticle containing 8000 carbon atoms is therefore; 3 × 8000 = 24,000 oscillators.
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