Answer: B
Explanation: 2 isotopes of boron are present.
Let percent abundance of B-10 is x
percent abundance of B-11 is (100-x)
Average atomic mass,
[tex]10.80=\frac{x*10+(100-x)*11}{100}[/tex]
[tex]10.80=\frac{10x+1100-11x}{100}[/tex]
[tex]1080=1100-x[/tex]
[tex]x=20[/tex]
hich of the following statements correctly describe functional groups? multiple select question. some functional groups contain a heteroatom. some functional groups contain only a ring structure. some functional groups contain a multiple bond. some functional groups contain both a heteroatom and a multiple bond.
Some functional groups contain a heteroatom, Some functional groups contain a multiple bond, some functional groups contain both a heteroatom and a multiple bond. these statements correctly describe functional groups.
functional group in organic chemistry is a substance or amide in a particle that creates the molecule's distinctive feature chemical reactions. Regardless of the rest of the molecule's composition, the same functional group will undergo the same or similar chemical reactions. Functional groups are collections of one or more atoms that have distinct chemical properties regardless of what they are attached to. Covalent bonds communicate the particles of functional groups to each other and to the remainder of the molecule. All life processes, such as nourishment, excretion, and respiration, can be carried out by a cell. As a result, it is known as the functional unit of life. All living beings are made up of cells, which are the smallest unit of life.
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Which statement is true concerning the formation of alcohols by the hydroboration-oxidation sequence?
A) overall, the process results in syn addition and Markovnikov orientation
B) overall, the process results in anti addition and Markovnikov orientation
C) overall, the process results in syn addition and anti-Markovnikov orientation
D) overall, the process results in anti addition and anti Markvnikov orientation.
The statement that is true for the formation of the alcohols by hydroboration-oxidation sequence is C) overall, the process results in syn addition and anti-Markovnikov orientation.
The hydroboration oxidation is the chemical reaction in the alkenes are converted in to the alcohols. this is the two steps process , the step steps includes the hydroboration and the other steps includes the oxidation. The conversion of the alkenes in to the alcohols is done by the anti markovnikov reaction. it is result of the net addition of the water.
Thus , the hydroboration oxidation done by the syn addition and the anti markovnikov orientation.
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An electron in the hydrogen atom makes a transition from an energy state of principal quantum numbers into the n=2 state. If the photon emitted has a wavelength of 434 nm, what is the value of ni? (RH = 2.18 X 10-18 J)
If an electron in a hydrogen atom changes from an energy level with primary quantum numbers to the n=2 state, emitting a photon with a wavelength of 434 nm, the value of ni is five.
what does Rydberg's equation explains?
The wavelength of light produced by an electron transitioning between atomic energy levels is predicted by the Rydberg formula. There is just one spectral fingerprint for each element. Light is created when an element is heated in its gaseous state. Bright lines of different colours can be seen when this light filters through a prism or diffraction grating. Each component stands out from the others in some way.
According to the question:
A single electron species makes up hydrogen.De-excited from one energy level to another, the electron emits a photon with a certain wavelength.To determine the energy level from which the electron has transitioned, we must utilise Rydberg's formulaTo know more about Rydberg's equation:
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Which of the following alcohols are used as preservatives in embalming fluids?
1 - Isopropanol
2 - Glycerol
3 - Ethanol
4 - Sorbitol
2 - Glycerol. Glycerin, a quick-acting dehydrating fixative that is also utilized for the preservation of anatomical specimens, is another chemical that is employed.
What makes up the majority of the embalming fluid?Typically, formaldehyde, glutaraldehyde, methanol, and other solvents are present in embalming fluid. Methanol concentrations can range from 9 to 56%, whereas formaldehyde content typically falls between 5 and 37 percent.
What is a preservative that is employed in the embalming procedure?Formaldehyde is used in embalming fluids as a preservation. The simplest aldehyde is formaldehyde, which has the chemical formula HCHO. A solution of formaldehyde in water, typically with a little quantity of methanol added, is called formalin. It is frequently used as an antiseptic, disinfectant, and biological material preserver.
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please answer both of these answers correctly I am putting this on 100 points because I'm rich and it's the holidays (the two questions are separate)
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, there is a large difference between (β −) decay and (β +) decay.
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle.
A neutron decays into a proton in beta minus (β −) , an electron and an electron antineutrino are produced. A proton decays into a neutron in beta plus (β +) , a positron and an electron neutrino are produced. Positron emission is another name for the β + decay.
Therefore, there is a large difference between (β −) decay and (β +) decay.
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Which of the following statements are part of the proper calculation of the mass % of O in acetic acid (CH3COOH)? Select all that apply.
Multiple select question.
a. The molar mass of acetic acid is 31.03 g/mol.
b. % O = 53.29%
c. The mass of oxygen atoms in a mole of acetic acid is 32.00 g.
d. The molar mass of acetic acid is 60.05 g/mol.
e. % O = 26.64%
The part of the proper calculation of the mass % of O in acetic acid is option B. % O = 53.29%
The mass of oxygen atoms in a mole of acetic acid is 32.00 g.
The molar mass of acetic acid is 60.05 g/mol.
Calculation :
2×16.00
% O = --------- × 100 = 53.29%
60.05
Acetic acid is used as a food preservative and food additive (known as E260). Large amounts of acetic acid are used in the manufacture of products such as textile inks, dyes, photographic chemicals, pesticides, pharmaceuticals, rubber and plastics. It is also used to remove scale with some household cleaners.
Acetic acid is he second simplest carboxylic acid after formic acid. It is an important chemical reagent and an industrial chemical mainly used in .
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If any of the the ions comprising an insoluble ionic solid remain in solution, which statement below best describes the state of saturation? Select the correct answer below: O The solution must be saturated. O The solution must be supersaturated. O The solution must be unsaturated. O The solution could be saturated, supersaturated or unsaturated.
If any of the ions comprising an insoluble ionic solid remain in the solution, The solution must be supersaturated.
Known as a saturated solution, this fluid is created when the maximum amount of solute dissolves at a specific temperature. A solution is said to be supersaturated if there is more solute present than is necessary to reach saturation.
By adding a tiny amount of solute, you can quickly determine if a solution is saturated, supersaturated, or neither. The solute will dissolve in a solution that is not saturated. That is not the case if the solution is saturated. The solute you've added will rapidly form crystals if the solution is supersaturated.
Supersaturation is a non-equilibrium physical state where a solution contains more solute than the equilibrium solubility permits under the circumstances, such as the system's temperature and pressure.
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A gas cylinder that contains argon has an internal volume of 43.8 L. A pressure gauge attached to the cylinder reads 1830 psi (1 atm = 14.7 psi) at 22.5 C. What mass of argon is contained in the cylinder?
The perfect ideal gas equation (PV = nRT) relates the macroscopic residences of perfect gases and thus here the mass of argon is contained in the cylinder is 9.70 kg.
Use the proper fueloline regulation, PV=nRT.
0.08206 L*atm*K-1mol-1 for R, the ideal gas constant.
That approach we want to transform psi to atm via way of means of multiplying 1990 psi via way of means of (1atm/14.7psi).
That offers us a stress of a hundred 35.4 atm Convert 24.7C to Kelvin via way of means of including 273.15.
We want moles for you to calculate the mass of argon, Ar by n = PV/RT.
I get 242.7 moles Ar as about 1 mole occupies 22.4 L at STP, and that we've a stress this is 135 instances better than 1 atm.
Now that we've moles Ar, we will convert that into mass via way of means of multiplying via way of means of argon's molar mass of 39.95g/mole.
Now we get 9695 grams (9700 grams with three sig figs), or 9.70 kg, with three sig figs.
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Which of the following statements is true? A) Q does not change with temperature. B) Keq does not change with temperature, whereas Q is temperature dependent. C) K does not depend on the concentrations or partial pressures of reaction components. D) Q does not depend on the concentrations or partial pressures of reaction components. E) Q is the same as Keq when a reaction is at equilibrium.
The right answer is E: Q is the same as Keq when a reaction is at equilibrium.
Market supply and demand must balance one another to reach equilibrium, which leads to stable pricing. In general, when there is an abundance of products or services, prices decline, which increases demand, but when there is a scarcity, prices rise, which decreases demand.
The Latin word libra, which meaning weight or balance, is the word's etymological ancestor. Here are a few instances of equilibrium: a book that is at rest on a table. a vehicle that is driving at a steady speed. a chemical process in which both the forward reaction rate and the backward reaction rate are equal.
Equilibrium types include
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A science class is conducting an investigation to see how gravity affects objects of different masses. They drop three balls from the same height. They time how long it takes the balls to hit the ground. What are the students comparing?(1 point) Responses the mass of each ball the mass of each ball the time it takes for each ball to fall the time it takes for each ball to fall the gravitational attraction of each ball the gravitational attraction of each ball the height from which each ball is dropped
Answer:
2
Explanation:
Use the following list of reagents and conditions to efficiently synthesize the product on the right from the starting material on the left. a Br2, FeBr3 b [1] LIAIH4, [2] H20 c (CH3)2NH, DCC d PCC e NaCN, HCI f (CH3)2NH, NaBH3CN g H2, Pd-C h NaNO2, HCI i Cul j CuCN k H2PO2 l HBF4
We use regent DCC and [tex](CH_3)_2NH[/tex]
As per the details share in the above question are as follow,
Following are the list of reagents and conditions to efficiently synthesize.
To convert,
cyclopentand to cyclopentylamine.
cyclopentand the chemical formula [tex]C_5H_{10}[/tex] and CAS number 287-92, cyclopentane is a very combustible alicyclic hydrocarbon that is made up of a ring of five carbon atoms that are each connected to two hydrogen atoms above and below the plane. It appears as an odourless liquid with a hue similar to petrol.
cyclopentylamine
We have to oxidation the PCC.
First we have to convert cyclopentanol to cyclopentanone.
Hence we use the regent d and c .
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Note : Question will be ,Use the following list of reagents and conditions to efficiently synthesize the product on the right from the starting material on the left. a Br2, FeBr3 b [1] LIAIH4, [2] H20 c (CH3)2NH, DCC d PCC e NaCN, HCI f (CH3)2NH, NaBH3CN g H2, Pd-C h NaNO2, HCI i Cul j CuCN k H2PO2 l HBF4
Enter your answer as a list of steps separated by semicolons, for example: a;b;c
Question 29 (3 points)
Hydrocarbons are compounds that are made up of only carbon and hydrogen atoms.
Write the skeleton equation and balanced chemical equations, including all states of
matter, for the complete combustion of propane (C3H8). [3 marks]
Answer:
Explanation:
The skeleton equation for the complete combustion of propane (C3H8) is:
C3H8 + O2 -> CO2 + H2O
The balanced chemical equation for the complete combustion of propane (C3H8), including all states of matter, is:
2 C3H8 (g) + 9 O2 (g) -> 6 CO2 (g) + 8 H2O (g)
In this equation, the propane (C3H8) is in the gaseous state, and the oxygen (O2) and the products (CO2 and H2O) are also in the gaseous state. This equation shows that when propane (C3H8) undergoes complete combustion, it reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O) as products. The coefficients in front of each chemical species indicate the number of moles of each substance that are involved in the reaction.
1) You are given an unknown solution, which contains both aqueous barium ion, Ba' (ag), and aqueous lead(11) ion, Pb2+ (aq). Which of your six solutions would allow separation of the ions? Select all that apply A. Ammonium chloride, NH,Cl(aq) B. Cobalt(II) nitrate, Co(NO3)2(aq) C. Silver nitrate, AgNO3(aq) D. Sodium chloride, NaCl(aq) E Sodium hydroxide, NaOH(aq) F Sulfuric acid, H2SO (aq)
Ammonium chloride will be the solution that separates aqueous barium ion and aqueous lead(II) ion out of the six solutions.
What is the described solution?
A solutions is any combination of one or more solutes that have dissolved in a solvent. A solute must dissolve in a solvent to produce a homogenous solution. A component must dissolve in a solution to produce a homogeneous mixture.
What exactly is a water solution?
A homogenous molecular mixture of two or more substances is referred to as a solution (uniform throughout). In this context, aquous solution, often known as a solution of water, refers to water functioning as a solvent. For example, the solute is salt and the solution is water in a mixture of salt and water.
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biewerm the conditions used in reactions of alkenes and alkynes determine whether reactions occur under cationic or radical conditions. in the following three sets of molecules, indicate the preferred product for the different set of conditions.
In the following three sets of molecules, indicate the preferred product for the different set of conditions as follows-
What is molecules?Molecules are a type of particle that is made up of two or more atoms that are chemically bonded together. Molecules can be found in all types of physical matter, from air to water to rocks and even in living organisms. Molecules are the building blocks of life, as they are responsible for the structure and function of every living organism. Molecules can also be used to describe many chemical compounds and interactions. The size, shape, and arrangement of molecules can affect the properties of a substance, and the way molecules interact with one another can determine the way a substance behaves.
Alkenes: Under cationic conditions, alkenes prefer to form an addition product, such as a Markovnikov addition product. Under radical conditions, alkenes prefer to form an elimination product.
Alkynes: Under cationic conditions, alkynes prefer to form an addition product, such as a Markovnikov addition product. Under radical conditions, alkynes prefer to form a substitution product.
Aromatic Compounds: Under cationic conditions, aromatic compounds prefer to form a substitution product. Under radical conditions, aromatic compounds prefer to form an addition product.
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according to the following reaction, how many grams of dinitrogen monoxide will be formed upon the complete reaction of 21.7 grams of ammonium nitrate? ammonium nitrate (aq) dinitrogen monoxide (g) water (l) grams dinitrogen monoxide
11.935 grams of dinitrogen monoxide (g) is formed during the given reaction.
Reaction of the given question is:
[tex]NH_4NO_3 (aq) - > N_2O (g) + 2H_2O (l)[/tex]
So according to Stoichiometry on complete decomposition of ammonium nitrate (aq) same number moles of dinitrogen monoxide (g) will be formed i.e if of ammonium nitrate (aq) have x moles initially then after complete reaction x moles of dinitrogen monoxide (g) will be formed.
so in order to calculate number of moles of [tex]NH_4NO_3[/tex] we will divide given mass of [tex]NH_4NO_3[/tex] with the molar mass of [tex]NH_4NO_3[/tex].
let number of moles of [tex]NH_4NO_3[/tex] be x
given mass of [tex]NH_4NO_3[/tex] is 21.7 grams
then x = [tex]\frac{given mass (NH_4NO_3)}{molar mass(NH_4NO_3)}[/tex]
molar mass of [tex]NH_4NO_3[/tex] = 14 + 1*4 +14 +3 *16
=> 14+4+14+48
=>80 grams
x= [tex]\frac{21.7}{80}[/tex]
so x = 0.27125
so moles of [tex]N_2O[/tex] formed = 0.27125
mass of [tex]N_2O[/tex] formed = 0.27125 * molar mass of [tex]N_2O[/tex] --- (i)
molar mass of [tex]N_2O[/tex] = 2* 14 +16
=>28+16
=>44 grams
putting the value in equation (i)
mass of [tex]N_2O[/tex] formed = 0.27125 * 44
=>11.935
so mass of [tex]N_2O[/tex] formed = 11.935 grams
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Study this chemical reaction: 2 AgNO3(aq)+Mg(s) 2Ag(s)+Mg(NO;)_ (aq) Then, write balanced half-reactions describing the oxidation and reduction that happen In this reaction. oxldation: 0-D reductlon:
In the reaction, Mg (s) + 2 AgNO3 (aq.) → 2Ag (s) + Mg (NO3)2 (aq.) the half reaction can be written by the reduction and oxidation reaction.
Reduction occurs in this reaction. Since oxidation number of silver changes from +1 to 0. So, it is undergoing reduction in the reaction. This may be decomposed in two half reactions, one for the oxidation of the electron donor and one for the reduction of the electron acceptor. The oxidation of a substance follows a second-order kinetics dependent not only on the substrate concentration but also on the oxidizing agent concentration. The same holds for the reductions with regard to the reducing agent concentrations.
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Entropy measures:
a. Temperature at constant pressure
b. Temperature at constant volume
c. Temperature as pressure increases
d. Temperature as pressure decreases
e. Chaotic messiness
Entropy measures Temperature at constant volume. hence the option b is correct for the entropy measures.
Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion. Take an energy reading at a given temperature to calculate entropy. To measure the thermal energy transferred at a certain temperature, a calorimeter is typically used. Maintain the temperature value mathematically constant by assuming only extremely slight variations in the process's conditions.
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What element is always present in all organic compounds
Answer: CARBON (C)
Explanation: The element that is always present in all organic compounds is carbon. Organic compounds are chemical compounds that contain carbon and hydrogen atoms, and often also contain other elements such as oxygen, nitrogen, and sulfur. Carbon is the fundamental building block of organic compounds, and all organic compounds are derived from carbon-based molecules. This is because carbon has the ability to form a large number of chemical bonds with other atoms, which allows it to form a vast array of complex and diverse molecules. Some common examples of organic compounds include carbohydrates, lipids, proteins, and nucleic acids.
Answer:
Explanation:
All organic compounds contain carbon. Carbon is a chemical element with atomic number 6 and is represented by the symbol C. It is a highly versatile element and can form a vast number of compounds, including carbohydrates, lipids, proteins, and nucleic acids. These compounds are the building blocks of life and are essential for the functioning of living organisms. In addition to carbon, most organic compounds also contain hydrogen and, to a lesser extent, other elements such as oxygen, nitrogen, and sulfur.
Answer questions a-c about the Bronsted acid-base reaction below using the identifying letters A-D below each structure. The pKa's for the acids of interest are: water (pKa= 15.7), and acetic acid (pKa = 4.8).
CH3C OH + HOH OH acetic acid hydroxide acetate water
a) The stronger acid is:
b) Its conjugate base is:
c) The species that predominate at equilibrium are (two letters, e.g. ac):
Acetic acid is a strong acid because its PKa value is lower, Acetate is its conjugate base, At equilibrium, the product will be dominant. as the acid-base reaction produces conjugate base and water
In an aqueous solution, strong acid is completely distanced. It is a chemical substance with a high proton loss capacity, H+. A strong acid loses one proton in liquid, which is managed to capture by liquid and forms the order to accurately describe ion: HA(aq) + H2O H3O+(aq) + A (aq) In an aqueous solution, a strong acid is totally ionised. In an aqueous solution, a weak acid is one that ionises only mildly. Strong acids, including such hydrochloric acid, have a pH of 0 to 1 at the concentrations commonly used in laboratories. The greater the amount of hydrogen ions present in the solution, the lower the pH.
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Provide the IUPAC name and structure for the alkyne expected to produce the two compounds listed below upon ozonolysis. CH3CH2CO2H and (CH3)3CCO2H
These alkynes are anticipated to ozonolyze to form the following two compounds: 2,2-dimethyl-3-hexyne.
Explain compounds in detail.A compound is a material that is created when two or more distinct chemical components are mixed in a certain proportion. When the elements come together, they interact and create chemical connections that are hard to break. The sharing or trading of electrons between atoms results in the formation of these bonds.
What kind of substance is this, exactly?A material that has been chemically bonded together from two or more distinct components. Water (H2O), which is a combination of the elements hydrogen and oxygen, and table salt (NaCl), which is a composite of the elements sodium and chloride, are two examples of compounds.
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in tlc chromatography, the ___represents the stationary phase and the ___ represents the mobile phase.
Silica serves as the stationary phase in tlc chromatography, while liquid serves as the mobile phase.
What is chromatography and how does it work?Separate mixture's constituent parts by chromatography is a method. This mixture gets dissolved in a material known as the mobile phase to start the process, which then transports it through a material known as the stationary phase.
What is the advantage of chromatography?Chromatography enables precise separation, analysis, and purification. Very little sample volume is needed. It works with a variety of materials, including tissue extracts, plastics, food particles, pesticides, medicines, and food particles.
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When does a car no longer have kinetic energy
which of the following are examples of colligative properties. freezing point elevation increases vapor pressure increases osmotic pressure boiling point elevation
The correct option is C Osmotic pressure
Only Osmotic pressure is a colligative property.
What is Osmotic pressure?
Osmosis is the process by which water moves from a region with a low concentration of solute to one with a greater concentration. Atoms, ions, or molecules dissolved in a liquid are known as solutes. The total amount of particles dissolved in the fluid determines the rate of osmosis. The rate of osmosis increases with the number of particles that dissolve.
Water will go to the region with the highest solute concentration if a membrane is present. The pressure produced by water across a membrane as a result of osmosis is known as osmotic pressure. The osmotic pressure rises in direct proportion to the amount of water crossing the membrane.
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A 0.125-gram sample of a monoprotic acid of unknown molar mass is dissolved in water and titrated with 0.1003 M NaOH. The equivalence point is reached after adding 20.77 mL of base. What is the molar mass of the unknown acid?
The equivalence point is reached after adding 20.77 mL of base. The molar mass of unknown acid is 60 g/mol
given that :
mass of the monoprotic acid = 0.125 g
molarity of NaOH = 0.1003 M
volume = 20.77 mL = 0.02077 L
the number of moles = molarity × volume in L
= 0.1003 × 0.02077
= 0.00208 mol
moles = mass / molar mass
molar mass = mass / moles
= 0.125 g / 0.00208 mol
= 60 g /mol
Thus, A 0.125-gram sample of a monoprotic acid of unknown molar mass is dissolved in water and titrated with 0.1003 M NaOH. The equivalence point is reached after adding 20.77 mL of base. the molar mass of the unknown acid is 60 g/mol.
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indicate the number of protons and neutrons in the following nuclei. part a 5624mn2456mn express your answers as integers separated by a comma.
in the following nuclei. part a 5624mn2456mn is number of protons = 24 and number of neutrons = 56 - 24 = 32
fozrmula to calculate protons and neutron are atomic number = number of protons , mass number = number of protons + number of neutrons With the exception of simple hydrogen, neutrons are subatomic particles found within the nucleus of all atoms. The pseudonym of the particle stems from the fact that it lacks any electrical charge; it is neutral. Neutrons have an extremely high density. A proton is an elementary particle discovered in every nucleus of the atom. The atom has a positive charge that is equivalent to and contrary to the electron's. A single proton has a mass of only 1.673? 10-27 kilogramme if secluded, which is mildly smaller than the mass of a neutron. Offsetting the atomic number as from atomic mass yields the number of neutrons in an atom.
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At high temperatures, the proton transfer rate is dominated by the barrier-crossing process. The barrier is 2.40 kJ/mol at 298 K, and the Arrhenius prefactor A=6.00 x1011 s1. At low temperatures, the rate is dominated by proton tunneling. In this case, the proton tunneling rate constant is ktunnel = 1.41 x1010 s-1. a. Calculate the classical rate of proton transfer, kclassical from the barrier at 298 K. b. At which temperature, Teritical, is ktunnel = kclassical? c. Do you expect Teritical to increase or decrease if deuterium (H) is substituted for hydrogen? Explain. d. If the spacing between the minima is doubled but the barrier height remains the same, do you expect Teritical to change? Explain.
Pre-exponential factor can be obtained from the Arrhenius pre-factor and using this we can calculate the classical rate of proton transfer.
Pre-exponential factor (A) is an important component of the Arrhenius equation, which was formulated by the Swedish chemist Svante Arrhenius in 1889. The pre-exponential factor is also known as the frequency factor. It represents the frequency of collisions between reactant molecules at a standard concentration. it is actually dependent on temperature because it is related to molecular collision, which is a function of temperature. because the pre-exponential factor depends on frequency of collisions, it is related to collision theory and transition state theory. The collision theory deals with gases and neglects to account for structural complexities in atoms and molecules.
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Increasing the temperature of a reaction increases the speed at which the reaction occurs. Identify the statements that explain the correlation between the increase in temperature and the increase in reaction rate. O More atom-atom stretching and bending within the molecules occurs at higher temperatures, which creates more reactive molecular configurations. Added heat decreases the activation energy of a reaction and has a similar effect as adding a catalyst. ✓ Molecules at higher temperatures have greater kinetic energy, which results in more frequent and higher energy collisions. An increased temperature improves the reaction pathway by decreasing the energy difference between reactants and products.
Answer:
The correct statements that explain the correlation between the increase in temperature and the increase in reaction rate are:
More atom-atom stretching and bending within the molecules occurs at higher temperatures, which creates more reactive molecular configurations.
Molecules at higher temperatures have greater kinetic energy, which results in more frequent and higher energy collisions.
Added heat decreases the activation energy of a reaction and has a similar effect as adding a catalyst.
These statements are correct because they all describe mechanisms by which an increase in temperature can increase the rate of a chemical reaction. When the temperature is increased, the molecules of the reactants gain more kinetic energy, which causes them to move faster and collide more frequently. This can lead to more reactive configurations of the molecules, which makes it easier for them to react with each other. Additionally, the added heat can decrease the activation energy of the reaction, which means that it takes less energy for the reactants to overcome the energy barrier and form the products. This makes the reaction more likely to occur, and it increases the overall reaction rate. Finally, an increased temperature can also improve the reaction pathway by decreasing the energy difference between reactants and products, which can further increase the reaction rate.
Separate samples of an unknown aqueous solution are mixed with solutions of HBr(aq) H_2SO_2(aq). and NaOH(aq). A solid precipitate forms in all three cases. Which of the following cations could the unknown solution contain?
Previous question
Double displacement response will shape a precipitate if the only of the goods is insoluble in water.
The solubility guidelines offer a listing of cations and anions that if blended the ensuing compound is both soluble or insoluble. The response equations between K+ and the 3 answers are given below.
HBr(aq)+K+(aq)→KBr(aq)+H+H2SO4(aq)+2K+(aq)→K2SO4(aq)+2H+NaOH(aq)+K+(aq)→KOH(aq)+Na+The response between Pb2+ and the 3 answers are given below.2HBr(aq)+Pb2+(aq)→PbBr2(s)+2H+H2SO4(aq)+Pb2+(aq)→PbSO4(s)+2H+2NaOH(aq)+Pb2+(aq)→Pb(OH)2(s)+2Na+The response between Ba2+ and the 3 answers are given below.2HBr(aq)+Ba2+(aq)→BaBr2(aq)+2H+H2SO4(aq)+Ba2+(aq)→BaSO4(s)+2H+2NaOH(aq)+Ba2+(aq)→Ba(OH)2(aq)+2Na+From the solubility guidelines, all the goods fashioned withinside the answer containing Pb2+ are insoluble, a precipitate will shape in all 3 cases.Read more about solutions;
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Problems:
Show all three steps of using a formula - show the formula, fill in the formula, 8 solve for the answer.
22) Calculate the energy of a photon of radiation with a frequency of 9.50 x 10¹³ Hz.
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The energy of a photon of radiation with a frequency of 9.50 × 10¹³ Hz is 6.3 × 10⁻²⁰ J.
The Energy that comes from electromagnetic radiation is quantized, It exists in the form of small energy packets known as photons.
The energy of a photon is depends on the frequency at which it propagates from radiation source.
We can calculate the energy of a photon by the equation given below:
E = hν
where, E is the energy of photon
h is Plancks's constant whose value is 6.626 × 10⁻³⁴ Js
ν is the frequency of the radiation.
According to the question,
given,
frequency ν = 9.50 × 10¹³ Hz
therefore,
E = 6.626 × 10⁻³⁴ Js × 9.50 × 10¹³ Hz (∵1 Hz = 1s⁻¹)
E = 6.2947 × 10⁻²⁰ J
E≈ 6.3 × 10⁻²⁰ J
Thus, energy of the photon is 6.3 × 10⁻²⁰ J
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frederick griffith heat-killed a culture of pathogenic bacteria. he split the sample and injected half of it into mice. the mice lived. he then mixed the other half with a living, nonpathogenic bacteria strain and injected the mixture into mice. the mice died. these results best support which of the following conclusions.
A chemical that was transferred from pathogenic to nonpathogenic bacteria is what the data show to be the most convincing.
Bacteria that can cause disease are known as pathogenic bacteria. The pathogenic bacteria for humans are the main topic of this essay. The majority of bacterial species are benign and frequently helpful, but others can spread infectious illnesses. Less than 100 of these pathogenic species are thought to exist in humans.
They contain elements that facilitate bacterial adhesion to and invasion of cells and tissues. Some bacteria can easily avoid the body's defenses, while others create poisons that lead to symptoms and disease. The virulence factors that are produced are precisely controlled and regulated.
Pathogenic bacteria examples include:
Pseudomonas aeruginosa - may result in blood infections and pneumonia.The cause of tuberculosis is Mycobacterium tuberculosis.Foodborne illnesses and flu-like symptoms are brought on by listeria.E. coli is a bacteria that causes intestinal infections that manifest as fever and diarrhoea.
To learn more about pathogenic bacteria. Please visit the below link.
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