Answer:
a) Ca+ H2O = Ca(OH)2 + H2
What information does a molecular formula provide?
A. the number and kind of atoms that are bonded by the transfer of electrons
B. the simplest whole number ration of atoms that are bonded by the transfer of electrons
C. information about a molecule's structure
D. the number and kind of electrons present in a molecule
The information in which molecular formula helps to provide is the number and kind of electrons present in a molecule.
The correct answer choice is option d.
What is a molecular formula?A molecular formula is a formula which which helps to give information about the characteristic feature of an molecules as to the number and kind of electrons present in it.
A molecule is a substance which can normally exist alone and still retain the chemical properties of that substance.
In conclusion, we can now confirm from the explanation given above that molecular formula helps to to understand the constituent of a molecular substance.
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explain how osmotic concentration in sieve tube elements generates pressure and determines flow direction in phloem
The sucrose is actively transferred to the partner cells, and it diffuses from the companion cells to the sieve tube elements through the plasmodesmata.
As a result, the sucrose concentration in the sieve tube components rises. The same leaf vein receives water through osmosis from the neighboring xylem. The hydrostatic pressure on the sieve tube components rises as a result. Sucrose and other substances are forced through the sieve tube cells by hydrostatic pressure. Water is forced out of the sieve tube cells by osmosis, which reduces the hydrostatic pressure inside the cells. As a result of the entrance of sugars in sieve elements at the source and the elimination of sucrose, the pressure gradient is thus established.
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2. In the equilibrium between carbonic acid, bicarbonate, and carbonate which
molecule(s) are favored at low pH?
There would be more of the bicarbonate ion present in the solution at low pH.
What specie is favored at low pH?We know that the pH has to do with the degree of the acidity of the alkalinity of a given solution. We know that carbonic acid can be able to dissociate in solution via a reversible reaction.
In this case, when the pH is low, we know that there would now be more of the bicarbonate ion as the acid would begin to dissociate so as to counter the constraint of the pH that has been imposed on the system.
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Write balanced net ionic equation for the following reaction: Fe(OH)3(s) + H2SO4(aq) +? Express your answer as a chemical equation. Identify all of the phases in your answer
The balanced net ionic equation is as follows;
Fe(OH)₃ + H₂SO₄---> Fe₂(SO₄)₃+ H₂O
The transformations that take place as a result of a chemical reaction are represented by an equation called a chemical equation. The following is the standard format for a chemical equation:
Reactants -----> Products
One example of a straightforward chemical reaction is the formation of water through the combination of hydrogen (H₂) and oxygen (O₂) in the atmosphere (H₂O). Hydrogen and oxygen are the reactants in this reaction, and the result of the reaction is water. In order to create the chemical equation for this reaction, you would first start by writing the reactants on the left and the product on the right, with an arrow connecting the two to represent the direction in which the reaction occurs.
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Which one of the following conditions would always result in an increase in the internal energy of a system? A) The system loses heat and does work on the surroundings. B) The system gains heat and does work or the surroundings. C) The system loses heat and has work done on it by the surroundings. D) The system gains heat and has work done on it by the surroundings. E) None of the above is correct
The system gains heat and has work done on it by the surrounding, this condition would always result in an increase in the internal energy of a system. thus the option D is correct.
When a system is heated or has work done on it by its environment, the internal energy of the system is constantly raised. Energy is an immaterial substance that is concerned with performing work on an item. One of the fundamental conservation rules that holds true throughout the cosmos is the conservation of energy. A type of energy is internal energy. The total kinetic energy of each gas molecule can be considered to be the internal energy U of our system. In other words, when the gas's temperature T rises, its molecules move more quickly and its internal energy U rises.
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What is the mass of a neutron in atomic mass units (amu)?
The mass of a neutron in atomic mass units is 1.008665 amu
Because neutrons are atomic particles, neutrons are a component of atoms. The English physicist James Chadwick discovered neutrons for the first time in 1932. He found the presence of a particle with no electric charge while conducting radioactivity studies, and he named it the neutron which typically has zero charge.
The atomic mass unit or AMU is a unit of mass used to express the masses of atoms and molecules. The mass of a neutron is almost the same as the mass of a proton whereas the electron is much less massive. In terms of AMU, the mass of a neutron in atomic mass units is 1.008665 amu
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what is the mass (g) of 8.52 x 1022 molecules of nh3? enter your answer with 2 decimal places and no units.
The mass of 8.50 × 10²² NH₃ molecules is ≈ 1.84 g.
Solution:
Number of molecules = 8.50 × 10²² = 8687
Number of molecules = Number of moles × Avogadro's Number
8687 = Number of moles × 6.02×10^23
Number of moles = 8687\ 6.02×10^23 = 1443×10^-23 moles
Mass = Number of moles × Molar Mass = 1443×10^-23 × 17.031 = 24576×10^-23 = 2.4576×10^-18 g.
A quantitative measure of inertia, a fundamental property of all matter. In effect, it is the resistance that an object offers to changes in velocity or position when a force is applied. The greater the mass of an object, the smaller the change caused by an applied force.
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if the two different types of hydrogen atoms were equally reactive, what ratio of 1-chloropropane to 2-chloropropane would we expect as monochlorination products?
It is crucial to be able to extend out a line diagram to a condensed formula, therefore the first step in this process.
The next step is to begin sketching the various scenarios as we switch out one hydrogen on a propane cylinder for a chlorine atom. It should be obvious that there are only two options for chlorinating propane: C-1 or C-2 (chlorination at C-3 would give the same product as that at C-1).
Monochlorination means the addition of a chlorine atom. When chlorine atom is added to the below structure. Chlorine will substitute at one of the hydrogens.
Constitutional isomers of these two substances are 1-chloropropane and 2-chloropropane.
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the combustion of g benzoic acid increases the temperature of a bomb calorimeter by . calculate the heat capacity of this calorimeter.
With this method, a sample is burned in a bomb calorimeter at a constant volume. Equation q = -CT, where C is the calorimeter's heat capacity and T is the temperature change, can be used to determine how much heat is released during the reaction.
If 1.000 g of benzoic acid burns in a bomb calorimeter to produce 26.38 kJ of heat, 0.550 g of benzoic acid will produce the following amount of heat:Conventionally, heat release is denoted by a negative sign.The sum of the heat emitted by combustion (Qc) and the heat absorbed by the bomb calorimeter (Qb) equals zero, according to the Law of Conservation of Energy.
The temperature of the bomb calorimeter rose from 22.01 °C to 24.27 °C after absorbing 14.5 kJ. Using the following expression, we can determine the calorimeter's (C) heat capacity.
In a bomb calorimeter, the combustion of 0.550 g of benzoic acid raises the temperature from 22.01 °C to 24.27 °C.
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what is one possible problem from regenerating a greensand bed by adding a higher dosage of potassium permanganate?
The chemical element KMnO4 is the same as potassium permanganate. Manganese is in the +7 oxidation state in this salt. The salt is also referred to as "potash permanganate." The ion of permanganate is a potent oxidizer.
Another popular technique for treating water to remove sulfur is manganese greensand. It is often advised for water with less hydrogen sulfide than 6.0 mg/l. A unique coating on a manganese greensand filter causes hydrogen sulfide gas to oxidize into solid sulfur particles, which are then filtered. Potassium permanganate is used to rejuvenate the greensand after all of the manganese oxide has been used up. Potassium permanganate is a purple oxidizing chemical that is added to the untreated water to maintain the manganese greensand filter.
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how many of the following molecules possess dipole moments? bh3, ch4, pcl5, h2o, hf, h2
BH3,CH4,PCl5,and H2 have zero dipole moment whereas the H2O and HF have permanent dipole moment.
what is dipole moment?
The bond dipole moment is the moments but property of the chemical bond that is used to measure the polarity of the bond within a molecule.
BH3 a non-polar molecule owing to its symmetric structure.
CH4 forms a regular tetrahedral structure and has very small electronegativity difference between the atoms that cancels out each other due to their directional vectors. Thus CH4 is non polar.
PCl5 is made up of polar P−Cl bonds that form a trigonal bipyramidal molecular which is arranged symmetrically thus the PCl5 molecule is nonpolar.
H2O is a polar compound with a bent shape, which is the reason for the polarity of the compound.
HF is a polar molecule owing to higher electronegativity difference and no other bonds to cancel the polarity thus formed.
H2 is a diatomic molecule and hence it is non-polar.
Thus, the atoms that possess dipole moments are H2O,HF .
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Which of the following statements about the nucleus is true?
Answer:
The nucleus is surrounded by a double unit membrane from all sites. The chromosomes and genes which have genetical characters and transmit from one generation to another are found in the nucleus.
Explanation:
the heat of vaporization of water is 40.66 kj/mol. how much heat is absorbed when 3.22 g of water boils at atmospheric pressure? heat:
Heat energy is absorbed to boil the water at atmospheric pressure is 6.506kJ.
Atmospheric pressure, also known as barometric pressure, is the force per unit area exerted by an atmospheric pressure column (that is, the total mass of air over a given area). Atmospheric pressure can be measured with a mercury barometer . This gives the height of the mercury column exactly in balance with the weight of the atmospheric column above the barometer.
Atmospheric pressure is also measured using an aneroid barometer. In this case, the sensing element is one or more hollow, partially evacuated, corrugated metal discs supported against collapse by internal or external springs. Changes in the shape of the disc due to changes in pressure can be recorded with a pen arm and a clock-driven rotating drum.
Calculation :
Step : 1
Calculate the number of moles of water as follows :
[tex]Number of moles of water = \frac{mass}{molar mass}[/tex]
[tex]= \frac{2.88g}{18.0g/mol}[/tex]
[tex]= 0.16mol[/tex]
Step 2 :
Now, calculate the heat energy absorbed to boil the water at atmospheric pressure is as follows :
[tex]Q = n*[/tex]Δ[tex]H_{vap}[/tex]
[tex]= 0.16 mol * 40.66 kJ/mol[/tex]
[tex]= 6.506 kJ[/tex]
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it takes 16 min for a 10 ml sample of an unknown gas to effuse thtogh a pinhole. a 10 ml sample of he required 5 min. what is the molecular weight of the gas?
The molecular size of something like the unidentified molecule is 44.1 since it is calculated as earth's weight metric kilogram of the electrons needed to make one molecule per mole. Molar mass is expressed in grams for mole.
What is the name for molecular weight?
Molecular weight, commonly known as molecular mass, is the concentration of a particular chemical molecules, calculated using the atomic weight of carbon-12, which is 12. In actuality, it is determined by adding the atoms' atomic weights.
How do physical properties and chemical weight compare?
Additionally, the primary distinction between the two is whether mole ratio provides the amount of a mole of a certain material. In contrast, molecular weight refers to a substance's molecule's mass. Although number of moles has a separate definition and measurement system
Briefing:
rate = distance / time
let consider both travelled a distance d.
So, rate of Unknown gas = d / 16.6 min
rate of He = d / 5.00 min
From Grahams law of effusion,
rate1(Unknown gas ) / rate 2 (He) = √ MW 2 (He) / MW1 (Unknown) , MW = molecular weight
(d / 16.6 min) / (d / 5.00 min) = √ MW (He) / MW(Unknown)
0.301 = √ MW (He) / MW(Unknown)
(0.301)² = MW (He) / MW(Unknown)
MW(Unknown) = MW(He) / (0.301)²
= 4 / (0.301)²
= 44.1
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What process is represented by this redox equation?
-
6H20 + 6CO2
C6H1206 +602
A. Cellular respiration
B. Rusting
C. Photosynthesis
D. Combustion
The process that is represented by this redox equation
6 H₂O + 6 CO₂ ---> C₆H₁₂O₆ + 6 O₂ is photosynthesis.
The correct option is C.
What is a redox reaction?A redox reaction is a reaction in which oxidation and reduction occur simultaneously at the same time and to the same extent.
In a redox reaction, electrons are transferred from one species to another.
The species that transferred electrons becomes oxidized whereas the species that accepts electrons becomes reduced.
Hence, a reduction reaction is a reaction in which a chemical species accepts electrons while an oxidation reaction is a reaction in which a chemical species donates electrons.
Considering the given reaction:
6 H₂O + 6 CO₂ ---> C₆H₁₂O₆ + 6 O₂
In the given reaction, carbon is reduced while oxygen is oxidized.
The reaction shows the process of photosynthesis where carbon dioxide is reduced to produce glucose.
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the student then mixes in 20ml of naoh into the solution. the resulting mixture has a ph of 1.8. what was the concentration of the naoh solution that was added to the hcl
The student then mixes in 20ml of NaOH into the solution. The resulting mixture has a ph of 1.8. 0.135 M was the concentration of the NaOH solution that was added to the HCl.
To determine the concentration of the sodium hydroxide (NaOH) solution that was added to the hydrochloric acid (HCl) solution, we need to know the volume of the NaOH solution and the resulting pH of the mixture. The pH of a solution is a measure of its acidity or basicity. It is defined as the negative logarithm of the concentration of hydrogen ions (H+) in the solution. The concentration of H+ ions is directly related to the concentration of the acid (for an acidic solution) or the concentration of the base (for a basic solution).
In this case, we are given that the resulting mixture has a pH of 1.8 and that 20 mL of NaOH was added to the HCl solution. We can use the pH of the mixture and the volume of the NaOH solution to calculate the concentration of the NaOH solution as follows:
First, we need to convert the pH of the mixture to the concentration of H+ ions. To do this, we can use the formula:
[H+] = 10^(-pH)
Plugging in the value for pH, we get:
[H+] = 10^(-1.8)
= 0.135 M
Next, we need to use the volume of the NaOH solution and the concentration of H+ ions to calculate the concentration of the NaOH solution. Since the NaOH solution neutralized the HCl solution, the concentration of H+ ions in the mixture must be equal to the concentration of the NaOH solution. Therefore, the concentration of the NaOH solution is 0.135 M.
Therefore, the concentration of the NaOH solution that was added to the HCl solution is 0.135 M.
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what is the [oh−], [h+], ph, poh of 0.75 m ba(oh)2?
There will be twice quite so many OH ions as Ba(OH)2 molecules, with an OH- concentration of 1.5 M near the end.
Barium hydroxide, also known as baryta, has the formula Ba(OH)2. There is no odour to this clear white powder. It is naturally poisonous. It is ionic in nature; for example, in aqueous solution, Ba(OH)2 could provide two hydroxide ions for every molecule.
Given,
[Ba(OH)2] = 0.75 M
To find,
[H⁺] = ?
[OH⁻] = ?
pH = ?
pOH = ?
1. Identify the [H+]
If [H+] equals [Ba(OH)2, then [H+] = 10^13.8 = 1.58 M.
2. Calculate the pOH
pOH = - log[OH]
Substitution
pOH = - log(1.5)
Result
pOH = 0.17
3.- Calculate the pH
Formula
pH + pOH = 14
Find a solution for pH
pH = 14 - 0.17
Result
pH = 13.8.
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put the buning metal into a circible and collect the product. this sentence change into past passive
I put the burning metal into a crucible and then collected the product.
suppose that 0.08 m^3 of a gas has a gauge pressure of 2 atm and a temperature of 300 k. how many molecules are there in the gas?
Suppose that 0.08 m^3 of a gas has a gauge pressure of 2 atm and a temperature of 300 k. Approx 27 x 10^20 molecules are there in the gas.
To find the number of molecules in the gas, we can use the ideal gas law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
In this case, we know that the pressure is 2 atm, the volume is 0.08 m3, the temperature is 300 K, and the ideal gas constant is 8.31 J/mol*K. We can solve for the number of moles by rearranging the equation and substituting the known values:
n = (PV) / (RT)
= (2 atm * 0.08 m3) / (8.31 J/mol*K * 300 K)
= 0.0046 mol
Since there are Avogadro's number (6.022 x 10^23) of molecules in one mole of a substance, the number of molecules in the gas is:
Number of molecules = number of moles * Avogadro's number
= 0.0046 mol * 6.022 x 10^23 molecules/mol
= 27 x 10^20 molecules
Therefore, there are approximately 27 x 10^20 molecules in the gas.
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what volume of bromine is required to react with 165 liters of chlorine gas according to the following reaction? (all gases are at the same temperature and pressure.)
The volume of bromine that is required to react with 165 liters of chlorine gas is 49.8 L.
(1) volume of chlorine=33.8 liters
Given reaction equation: Br2(g)+Cl2(g) -> 2BCl(g)
In case of gases, molar ratio can be expressed in terms of volume occupied by each gas at constant temperature and pressure.(volume is directly proportional to number of moles of gas).
According to the balanced reaction, moles of bromine =moles of chlorine=33.8 L
Hence volume of bromine required = 33.8 litres
(2)according to given reaction:
2BrF3 (g) -> Br2(g)+3F2(g)
total moles of product =4
reactant=2
Hence ratio of moles of reactant: product=2:4 i.e., 1:2.
so, total volume of product = 2 * volume of reactant(BrF3)=2*24.9L = 49.8 liters
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HELP ME PLEASE THANK YOU
Answer: 2.)black
3.)red
4.)yellow
5.) I don't know I am very sorry
6.) I don't know I am very sorry
7.) light blue
8.) purple
9.) dark green
10.)purple
Two cars, one of them is two time as heavy as the other, move down a hill at the same constant speed. Compared to the lighter car, the kinetic energy of the heavier car is ____ as much
half
equal
four times
twice
Answer:
twice
Explanation:
how many moles of naoh are contained in 15.2l of a 0.205m naoh solution? multiple choice 125 moles naoh 0.0134 moles naoh 3.12 moles naoh 74.1 moles naoh 0.0779 moles naoh
3.12 moles NaOH are contained in 15.2l of a 0.205m NaOH solution
15.2 x 0.205 = 3.116 moles. By rearranging the equation, you must first determine how many moles are there in this solution. False. Molarity (M) x Volume (L) equals 15.2 x.205, or 3.12 moles.
Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the NaOH solution in liters, is the most often used unit to represent NaOH solution concentration: liters of solution/moles of solute equals M. One liter of a NaOH solution with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute.
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Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3+3CO→2Fe+3CO2
If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the reaction and how many grams will be remaining?
The 0.118 moles are the mass Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3+3CO→2Fe+3CO2.
Limiting and Excess Reactants:There are sorts of reactants which can be utilized in a chemical response process, those are the proscribing reactant and the extra reactant. There is continually a leftover quantity of the extra reactant after a response. The most quantity of merchandise that may be produced relies upon at the proscribing reactant.
mass of Fe2O3, mFe2O3 = 23.zero gmass of CO, mCO = 15.forty gmolecular weight of Fe2O3 MWFe2O3 = 159.sixty nine g/molmolecular weight of CO MWCO = 28 g/molFirst, we display the balanced chemical response:Fe2O3 + 3CO --> 2Fe + 3CO2First, we convert the loads of the reactants into moles the usage of their molecular weight:
Solving for moles of Fe2O3, nFe2O3,
nFe2O3=mFe2O3MWFe2O3=23.0g159.69gmolnFe2O3=zero.144molesSolving for moles of CO, nCO,nCO=mCOMWCO=15.4g28gmolnCO=zero.55molesIn figuring out the proscribing and extra reactants, we decide the moles required for every reactant if we used all of the given moles adjusted consistent with their mole ratio withinside the balanced response.
The moles ecess reactant =nCO−nCOx=zero.fifty five−zero.432=0.118 molThe mass of the extra reactant left is calculated the usage of its moles and molecular weight,
massexcessreactantleft=mCO×M.
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calculate the ph of the resulting solution if 25.0 ml of 0.250 m hcl(aq) is added to 35.0 ml of 0.250 m naoh(aq)
The pOH of the resulting solution is 1.38 as the resulting solution is basic in nature.
M HCl= 0.250 M
M NaOH= 0.250 M
V HCl=25.0 ml
V NaOH=35.0 ml
In order to calculate the pOH of the solution,
M mix= 0.250x25*0.250x35/25+35
M mix=6.25-8.75/60
=2.5/60
=0.0416 M
The solution will be more basic as the milliequivalent of the base is more., thus calculate pOH.
pOH or potential of hydroxide ion is a scale used to determine the hydroxide ion (OH–) concentration in a solution.
[OH-]=Mxnx∝
[OH-]=0.04167x1x1
[OH-]=0.04167 M
pOH=-log[OH-]
pOH=-log 4.167x10^-2
pOH=2-log 4.167
pOH=2-0.62
pOH=1.38
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what volume of oxygen is produced at stp when 6.58 x 1024 molecules of water is decomposed according to the following reaction?
122 L of oxygen is produced at STP when water is decomposed to the reactants. here decomposition reaction occurs.
Decomposition Reaction is the process or effect of simplifying a single chemical entity into two or more fragments. Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis. Decomposition reaction of water can be written as,
2H2O → 2H2 + O2
Oxygen is produced at STP when 6.58 x 1024 molecules of water is decomposed. So there will be,
0.5 × 6.58 × 1024
= 3.29 × 1024 O2 molecules.
1mole = 6.02×1023 particles, so the amount produced is:
= 3.29×1024 / 6.02×1023
= 5.47mole
At an STP of 273K, 1atm the volume is 22.4L/mole
So the volume of oxygen is 5.47 × 22.4 = 122L
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given a concentrated solution of 50x concentration tae buffer, what volume (in ml) of this concentrated solution would we dilute to have 500ml of 1x tae buffer solution?'
We would dilute 10mL of this concentrated solution to make 500ml of a 1x TAE buffer solution.
Dilution is one of the easiest ways to make buffers. This is only applicable, though, if the working solution, which is the desired solution, has the same pH as the stock solution, which is the readily available, more concentrated solution. The dilution equation is employed in the preparation of buffer by dilution:
[tex]C_{1} V_{1} = C_{2} V_{2}[/tex]
where V refers to volume and C represents concentration. The subscripts 1 and 2 often denote the working solution and stock, respectively. Notably, both sides of the equation must always use the same units for concentration and volume.
From a stock of 50X TAE buffer, make 500mL of 1.0X TAE buffer as follows:
[tex]C_{1} V_{1} = C_{2} V_{2}[/tex]
(50X)V1=(1.0X)(500mL)
∴V1=10mL of 50X TAE Buffer
Calculating the volume of the water-based solvent is also necessary to finish the preparation. The remaining amount of water is needed to make the appropriate amount of working solution, which is 500mL.
[tex]V_{water}[/tex]=500mL−10mL=490mL
As a result, 490mL of water is used to dilute 10mL of 50X TAE Buffer.
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Which of the following is NOT an ionic compound?
A. AIN
B. CO
C. K20
D. Li2O
which of the following is not a ligand to the porphyrin ring fe(ii) ion in oxymyoglobin?
His E7 isn't a ligand for the porphyrin ring (Fe(II)) ion in oxymyoglobin.
In the porphyrin ring, four pyrrole nitrogens are bound to the a ferrous (Fe(II)) ion centre. The Fe(II) ion does have six coordination sites, four of which are inhabited by pyrrole nitrogen, one by proximal histidine, and the final site can form a reversible bond with an O2 molecule.
A porphyrin is a large ring molecule composed of four pyrroles, which are smaller rings with four carbons and one nitrogen. A series of single and double bonds connect these pyrrole molecules, causing the formation of a large ring. The technical term for four pyrroles linked together is tetrapyrrole. The ring is flat in space and has a fairly even electron distribution around in its circumference.
A porphyrin is thus categorized as an aromatic compound. This demonstrates how stable a porphyrin molecule is. Porphin is the general porphyrin model. This molecule appears as just an intermediate in nature only on rare occasions, but it serves as the foundation for all porphyrin molecules.
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What makes a nuclear reaction a transmutation?
Any process that modifies the number of protons or neutrons in an atom's nucleus is considered a nuclear transmutation. Therefore, modification in the number of protons or neutrons in an atom's nucleus is considered a nuclear transmutation.
What is nuclear reaction?When two nuclei or a nucleus and an outside subatomic particle meet, it is known as a nuclear reaction and one or more new nuclides are created.
Nuclear reactions, where a nucleus and an outside particle interact, or radioactive decay, where no outside cause is required, can both result in a transmutation.
Therefore, modification in the number of protons or neutrons in an atom's nucleus is considered a nuclear transmutation.
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