Consider the reaction of a generic metal ion (Mn+) with a generic porphine molecule (por): M(H2O)mn+(aq)+por(aq)⇌M(por)n+(aq)+mH2O(l) Based on the values of standard enthalpy, ΔH∘, and entropy, ΔS∘, shown here, ΔH∘ ΔS∘ -21.5 kJ 7.82 J/KJ/K what is the value of the formation constant, Kf , for the reaction at 25 ∘C?
Answers
Kf, at 25 °C, is 713 for the reaction M(H2O)mn+(aq)+por(aq)⇌M(por)n+(aq)+mH2O(l)
The chemical compound porphine, sometimes known as porphin, has the formula C20H14N4. It is the simplest of the tetrapyrroles since it is composed of four pyrrole-like rings connected by four methine (= C H ) groups to form a bigger macrocycle ring. The molecule is flat. It is categorized as a heterocyclic and aromatic chemical. The measure of a system's chaos is called entropy. It is an extensive characteristic of a thermodynamic system, which indicates that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the symbol S and is measured in joules per kelvin (JK1) or kg/m2/s2K1. The entropy of a well organized system is low.
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Related Questions
Indigo and/or Crystal violet can be used for: (select all that apply)
a. Fabric dye b. Stain in microbiology c. Disinfectant d. Ph indicator
Answers
Indigo can be used for fabric dye. Crystal Violet can be used as a fabric dye and stain in microbiology
What are the uses of Indigo and Crystal Violet?The possible uses for each:
a. Fabric dye -Indigo and Crystal violet are commonly used as fabric dyes due to their vibrant colors and ability to bind to fabric fibers, creating long-lasting and colorfast dyeing effects.
b. Stain in microbiology - Crystal violet is also commonly used as a stain in microbiology to dye bacterial cells for microscopic examination. It is often used in Gram staining, a common laboratory technique used to differentiate bacterial species based on their cell wall characteristics.
c. Disinfectant - Indigo and Crystal violet are not typically used as disinfectants
d. pH indicator - Neither Indigo nor Crystal Violet is typically used as a pH indicator.
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What is the possible pH range of the unknown substance based on the experimental outcome?
Between 7-8
Greater than 7
Between 6-10
Less than 7
Answers
The possible pH range of the unknown substance based on the experimental outcome is between 7-8 and is therefore denoted as option A.
What is pH?This is known as the power of hydrogen and it is used to measure the degree of acidity or alkalinity of a substance.
The color which was gotten during the experimental procedure in the laboratory were the shades of green which is between 7 and 8 using the hydrion paper which is therefore the reason why it was chosen as the correct choice in this type of scenario.
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How many orbitals are described by each of the below combinations of quantum numbers? n = 3, ℓ =2 orbitals n = 4, ℓ = 2, mℓ = 2 orbitals
Answers
Orbitals that are described by each of the combinations quantum numbers ; n = 3, ℓ =2 orbitals n = 4, ℓ = 2 is 5. ml=2 here is referring to last(5th) orbital space 4d.
What is orbitals?In atomic theory and quantum mechanics, atomic orbital is a function describing the location and wave-like behavior of electron in an atom.
Quantum numbers (n, l, ml, ms )
n=3, refers to 3rd energy level
3rd energy level has 3 possible values of l and d has 5 different orientations.
s=0 p=1 d=2
--> -2,-1,0,1,2
When; n=3 l=2, then number of orbitals is 5.
n=4 refers to 4th energy level ;
4th level has 4 possible l values;
s=0 p=1 d=2 f=3
When, n=4 l=2 and ml=2
The number of orbitals is 5 and ml=2 is referring to last(5th) orbital space 4d.
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PLEASE HELP!!!
How many grams of water could be vaporized (boiled) with 4590 Joules of heat?
Answers
Answer:
6
Explanation:
Elements that are shiny and are good conductors of electricity are:
a. Non-metals
b Metals
c. Halogens
d. Compounds
Answers
Answer:
Metals
Explanation:
It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration). A 43.19 gram sample of a hydrate of MgBr2 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 27.21 grams of the anhydrous compound remained. What is the formula of the hydrate?
Answers
Answer:
\(\rm MgBr_2 \cdot 6\, H_2O\).
Explanation:
Let \(x\) denote the number of \(\rm H_{2}O\) formula units for every \(\rm MgCl_{2}\) formula unit. The formula of the hydrate would be \({\rm MgBr_2} \cdot x\, {\rm H_2O}\).
Look up the relative atomic mass of each element on a modern periodic table:
\(\rm Mg\): \(24.305\).\(\rm Br\): \(79.904\).\(\rm H\): \(1.008\).\(\rm O\): \(15.999\).Formula mass:
\(\begin{aligned}M({\rm MgBr_{2}}) &= 24.305 + 2 \times 79.904 \\ &= 184.113\; \rm g\cdot mol^{-1}\end{aligned}\).
\(\begin{aligned}M({\rm H_{2}O}) &= 2 \times 1.008 + 15.999 \\ &= 18.015\; \rm g\cdot mol^{-1}\end{aligned}\).
The anhydrous compound would be \(\rm MgBr_{2}\). There was \(27.21\; \rm g\) of this compound. Calculate the number of moles of formula units in that much of this compound:
\(\begin{aligned}n({\rm MgBr_{2}}) &= \frac{m({\rm MgBr_{2}})}{M({\rm MgBr_{2}})} \\ &= \frac{27.21\; \rm g}{184.113\; \rm g \cdot mol^{-1}} \\ &\approx 0.1478\; \rm mol\end{aligned}\).
During heating, \(43.19\; \rm g - 27.21\; \rm g = 15.98\; \rm g\) of water \(\rm H_{2}O\) escaped from the hydrate. Calculate the number of formula units in that \(15.98\; \rm g\) of \(\rm H_{2}O\!\):
\(\begin{aligned}n({\rm H_{2}O}) &= \frac{m({\rm H_{2}O})}{M({\rm H_{2}O})} \\ &=\frac{43.19\; \rm g - 27.21\; \rm g}{18.015\; \rm g \cdot mol^{-1}} \\&= \frac{15.98\; \rm g}{18.015\; \rm g \cdot mol^{-1}} \\ &\approx 0.887\; \rm mol\end{aligned}\).
In other words, approximately \(0.1478\; \rm mol\) of \(\rm MgBr_{2}\) formula units (and hence the same number of moles of \({\rm MgBr_2} \cdot x\, {\rm H_2O}\) formula units) contain approximately \(0.887\; \rm mol\) of \(\rm H_{2}O\) formula units. Calculate the ratio between the two:
\(\begin{aligned}x &= \frac{n({\rm H_{2}O})}{n({\rm MgBr_2})} \\ &\approx \frac{0.1478\; \rm mol}{0.887\; \rm mol} \approx 6\end{aligned}\).
Hence, the formula of the hydrate would be \(\rm MgBr_2 \cdot 6\, H_2O\).
According to the following reaction, how many moles of ammonia
will be formed upon the complete reaction of 31.7 grams of nitrogen
gas with excess hydrogen gas?
N2 (g) + 3H2 (g) -> 2NH3 (g)
____mol
Answers
According to the balanced equation, 31.7 grams of nitrogen gas (N₂) reacting with excess hydrogen gas (H₂) will produce a 2.264 moles of ammonia gas (NH₃).
To determine the moles of ammonia formed, we need to convert the given mass of nitrogen gas to moles using its molar mass and the stoichiometric ratio of the balanced equation.
The molar mass of nitrogen gas (N₂) is 28.02 g/mol. To calculate the number of moles of nitrogen gas, we divide the given mass by its molar mass:
31.7 g / 28.02 g/mol = 1.132 mol
According to the stoichiometry of the balanced equation, the ratio between nitrogen gas and ammonia gas is 1:2. This means that for every 1 mole of nitrogen gas, 2 moles of ammonia gas are produced.
Therefore, using the stoichiometric ratio, we can determine the moles of ammonia formed:
1.132 mol N₂ * (2 mol NH₃ / 1 mol N₂) = 2.264 mol NH₃
Thus, upon the complete reaction of 31.7 grams of nitrogen gas with excess hydrogen gas, 2.264 moles of ammonia gas will be formed.
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The organisms that form the base of most open-ocean food webs are
Answers
Which statements describe lattice energy?
It is the energy the ions absorb when they form a crystalline compound.
It increases as the size of the ions decreases.
It increases as the charge on the ions increases.
It explains why ions form molecules.
It is a measure of the strength of the bonds between ions in a compound.
Answers
Answer:
IT is 2 3 and 5
Explanation:
i did this on ed and it was correct
Question 13 of 25
How has the work of chemists affected the environment over the years?
A. Chemists have both hurt the environment and helped the
environment by their actions.
B. Chemists have tried very hard not to impact the environment with
their work.
C. Chemists have ruined the environment through the misuse of
poisonous chemicals.
O D. Chemists have belan required to fix all environmental problems
that they have caused.
Answers
Answer: is A
Explanation:
how becuase i just take the test
Answer:
A
Explanation:
During which phase are two distinct nuclei present.
Answers
Answer:
During the completion of mitosis (telophase), two new nuclei form around the separated sets of daughter chromosomes (see Figure 8.29).
Explanation:
the rate constant of a certain reaction is known to obey the arrhenius equation, and to have an activation energy . if the rate constant of this reaction is at , what will the rate constant be at ? round your answer to significant digits.
Answers
The rate constant is 3.0 x \(10^{4} M^{-1} S^{-1}\) which is calculated by using the Arrhenius equation.
We can use the Arrhenius equation to find \((E_{a} / R)\)[(\((1/ T_{2} ) - ( 1/ T_{1} )\)] separately,
We have, Activation energy, \(E_{a}\) = 30.0 kJ/mole = 30000 J/mole
R = 8.314 J/mole .K
Temperature T2 = 201.0C = 201.0 + 273 = 474 K
T1 = 172 C = 172 + 273 = 445 K
Hence,
{ \((E_{a} / R)\)[(\((1/ T_{2} ) - ( 1/ T_{1} )\) } = (30000/8.314) x [(1/474) – (1/445)]
\((E_{a} / R)\)[(\((1/ T_{2} ) - ( 1/ T_{1} )\) = – 0.4961
Let us use this value and Rate constant \(K_{2}\) = 5.0 x 104\(M^{-1} S^{-1}\) and have to solve it for \(K_{1}\)
\(K_{1}\) / (5.0 x 104) = e –0.4961.
\(K_{1}\) / (5.0 x 104) = 0.6089
\(K_{1}\) = 5.0 x 104 x 0.6089
\(K_{1}\) = 3.0 x \(10^{4} M^{-1} S^{-1}\)
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The complete question is,
The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy is 30.0 kJ/mole. if the rate constant of this reaction is at 5.0 x 104\(M^{-1} S^{-1}\), what will the rate constant be at 172 C? round your answer to significant digits.
What is the force needed to accelerate a sled with a mass of 2 kg at a rate of
3.0 m/s²?
O
A. 2.0 N
B. 6.0 N
C. 1.5 N
D. 3.0 N
Answers
F = Ma
F = 2(3)
F= 6 Newtons
What is the nuclear symbol for an ion with a charge of +220 protons and 24 neutrons 
Answers
^242U^220+
Hope this helps!
Answer:
Hey there! The nuclear symbol for an ion with a charge of +220 protons and 24 neutrons would be written as follows:
220+ 24
The symbol consists of two parts: the atomic number (220+) and the atomic mass (24). The atomic number is the number of protons in the nucleus of an atom, and it is represented by a superscript on the left side of the symbol. The atomic mass is the total number of protons and neutrons in the nucleus, and it is represented by a subscript on the right side of the symbol.
In this case, the atomic number of the ion is 220, which indicates that it has 220 protons in its nucleus. The atomic mass is 24, which indicates that it has a total of 220 protons + 24 neutrons = 244 particles in its nucleus.
________________________________________________________
How do we represent the properties of atoms and ions using nuclear symbols?Nuclear symbols are a way of writing down the important information about atoms and ions in a short and easy-to-read format. They usually consist of two parts: the atomic number and the atomic mass. The atomic number tells us how many protons an atom has in its nucleus, and the atomic mass tells us the total number of protons and neutrons. For example, the nuclear symbol for carbon is 6 12C, which tells us that carbon has 6 protons and 12 particles (6 protons + 6 neutrons) in its nucleus.
How do we determine the number of protons, neutrons, and electrons in an atom or ion?To determine the number of protons in an atom or ion, we can look at its atomic number, which is usually written as a superscript on the left side of the nuclear symbol. For example, if the nuclear symbol for an atom or ion is written as 6 12C, we can tell that it has 6 protons. To determine the number of neutrons, we can subtract the atomic number from the atomic mass. For example, if the atomic mass is 12 and the atomic number is 6, then the number of neutrons is 12 - 6 = 6. To determine the number of electrons, we can just look at the overall charge of the atom or ion. If it is neutral, then it will have the same number of protons and electrons. If it is positive or negative, then it will have more or fewer electrons than protons, respectively.
which set of elements is arranged in order of increasing electronegativity?which set of elements is arranged in order of increasing electronegativity? p < f < si < s s < f < p < si f < s < p < si si < p < s < f
Answers
The correct order of increasing electronegativity for the given set of elements is: s, p, si, f, where fluorine (F) has the highest electronegativity and sodium (Na) is not included in the set.
Electronegativity is a property that describes the tendency of an atom to attract electrons towards itself when it is part of a chemical bond. In general, electronegativity increases across a period from left to right and decreases down a group in the periodic table.
Looking at the given sets of elements: p, f, si, s and s, f, p, si, we can determine the order of increasing electronegativity.
The correct set of elements arranged in order of increasing electronegativity is: s, p, si, f.
Fluorine (F) is the most electronegative element in the periodic table, and it attracts electrons strongly due to its small atomic size and high effective nuclear charge. Therefore, it has the highest electronegativity.
Following fluorine, oxygen (O) has a higher electronegativity than sulfur (S), which in turn has a higher electronegativity than phosphorus (P). This is because electronegativity generally increases across a period from left to right.
Silicon (Si) is less electronegative than phosphorus but more electronegative than sulfur. It is positioned in the middle of the order.
Lastly, sodium (Na) is less electronegative than silicon and is not included in the given set.
(Note: The set s, f, p, si is not in the correct order of increasing electronegativity, as fluorine should have the highest electronegativity.)
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True or false: conducting an endothermic reaction at a lower temperature will produce more products
Answers
It is false, Conducting an endothermic reaction at a lower temperature will produce more products.
An endothermic process would be any thermodynamic process that causes an increase in the system's enthalpy H. A closed system typically soaks up thermal energy from the surroundings, resulting in heat transfer into to the system. If the reaction is endothermic as written, increasing the temperature will cause the forward reaction, increasing the amounts of products while decreasing the amounts of reactants. Lowering the temperature has the opposite effect. A temperature change has no effect on an thermal reaction.
In the case of an endothermic process, a decrease in temperature causes the reaction to reverse and only the temperature to remain constant, because the reverse reaction is exothermic, which raises the temperature. Because energy must be absorbed for the reaction to occur, the products have more energy than the reactants.
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which is renewable energy source?
A) oil
B) coal
C) solar
D) natural gas
correct answer is C)
Answers
Answer:
The renewable energy source among the options you provided is solar power (option C). Solar energy is derived from the sun and can be converted into electricity or used for heating and other applications. It is a clean and sustainable form of energy.
Explanation:
explain hydrogen bonding.
Answers
Answer:
Hydrogen bonding, interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons; such a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces. Hydrogen bonds can exist between atoms in different molecules or in parts of the same molecule.
Explanation:
A bus travels a distance 150km
in 5 hours where as another bus travel 200km in
6 hours which bus travel fast
Answers
Answer: The bus traveling 200km in 6 hours is traveling the fastest.
Explanation:
Bus 1
150km/5hrs
Simplify -> 30km/hr
Bus 2
200km/6hrs
Simplify -> About 33.333km/hr
Help please!!! Its chemistry last unit
Answers
Answer:
Number 4 is the answer
Explanation:
I hope it will help you
14. how many mutations accumulated in this DNA sequence over 25 million years?
15. based on this data estimate the mutation rate for this DNA sequence over 100 million years.
Answers
This sequence accumulated 4 mutations in 25 million years (question 14) and therefore the mutation rate in 100 million years is 100% (4 each 25 My are 25 percent and therefore x 4: 100%) (question 15).
What is the mutation rate of a genetic sequence over time?The mutation rate of a genetic sequence over time refers to the rate at which a given nucleotide sequence changes throughout evolution, which may be expressed as a unit of percentage.
Therefore, with this data, we can see that he mutation rate of a genetic sequence in this case is 25% at each 25 My (the sequence has 16 nucleotides and 4 mutated).
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URGENT!!!! How many molecules of carbon dioxide are produced when a molecule of C7H15 combusts?
Answers
Answer:
7 seven
Explanation:
because when C7H15 is heated 7molecules of atoms are displaced
how many moles of copper (ll) chlorate contain 1.45x10^21
Answers
The molar mass of copper (II) chlorate can be used to calculate how many moles of copper (II) chlorate are present in 1.45x1021. Copper (II) chlorate has a molar mass of 222.07 g/mol.
By dividing the mass of copper (II) chlorate by its molar mass, it is possible to determine how many moles of copper (II) chlorate are contained in 1.45x1021.
Accordingly, there are 6.57x1018 moles of copper (II) chlorate in 1.45x1021, which is the amount of copper (II) chlorate.
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Find the volume v of the solid obtained by rotating the region bounded by the given curves about the specified line. Y = 8x3, y = 0, x = 1; about x = 2.
Answers
The volume v of the solid obtained is 15.08
By using the cylindrical shell method to find the volume v of the solid which can be expressed by the formula;
V = 2πrh drThen, it is paramount to determine the radius and height of the shell.
From the given information;
The cylindrical shell formed by the rotation about the line x = 2Let consider the radius to be 2 - xThe circumference = 2π(2 - x)The height = 8x³Then, the volume v of the solid can be estimated by using the cylindrical shell method as follows;
\(\mathbf{V = \int ^1_0 2 \pi (2-x) (8x^3) \ dx}\)
Open brackets;
\(\mathbf{V = 2 \pi \int ^1_0 (16x^3 -8x^4) \ dx}\)
Taking the integral form;
\(\mathbf{V = 2 \pi \Big [ \dfrac{16x^4}{4}-\dfrac{8x^5}{5} \Big]^1_0}\)
Solving the terms in the bracket
\(\mathbf{V = 2 \pi \Big [ \dfrac{16(1)^4}{4}-\dfrac{8(1)^5}{5} -0\Big]}\)
\(\mathbf{V = 2 \pi \Big [ 4-\dfrac{8}{5} \Big]}\)
\(\mathbf{V = 2 \pi \Big [ \dfrac{20-8}{5} \Big]}\)
\(\mathbf{V = 2 \pi \Big [ \dfrac{12}{5} \Big]}\)
\(\mathbf{V = \dfrac{24\pi}{5}}\)
\(\mathbf{V =15.08}\)
Therefore, we can conclude that the volume v of the solid obtained is 15.08
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when doing a starting point equation, use ___ to determine whether you need to make an acid or base equation
Answers
When doing a starting point equation, use Ka to determine whether you need to make an acid or base equation
To decide whether or not a substance is an acid or a base, remember the hydrogens on every substance earlier than and after the response. If the quantity of hydrogens has reduced that substance is the acid (donates hydrogen ions). If the quantity of hydrogens has improved that substance is the bottom (accepts hydrogen ions). The equivalence factor of a neutralization response is whilst each the acid and the bottom withinside the response had been absolutely fed on and neither of them are in excess. When a sturdy acid neutralizes a vulnerable base, the ensuing solution's pH may be much less than 7.
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Which biochemical pathways add or subtract carbons with the end product regenerating the molecule needed at the start?.
Answers
The biochemical pathways which add or subtract carbons with the end product regenerating the molecule needed at the start are called cyclic pathways.
A biochemical pathway is a chain of chemical reactions taking place within a cell. These reactions lead to the synthesis or breakdown of molecules which are important for various cellular processes such as growth, reproduction, and metabolism. Biochemical pathways are also called metabolic pathways.
Cyclic pathways are metabolic pathways in which the end product of the pathway regenerates the molecule required at the beginning of the pathway. These pathways are also called circular pathways or recycling pathways. Cyclic pathways play a crucial role in energy production and metabolism in living cells.Cyclic pathways involve the addition or subtraction of carbons in their reaction sequence. Some of the examples of cyclic pathways are the citric acid cycle, the Calvin cycle, and the urea cycle.
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1. How much energy (in calories and in Joules) will it take to raise the temperature of 75.0 g
of water from 20.0 to 55.0 °C? ( Specific Heat = 1 cal / ( g °C) and 4.184 J /(g°C) )
A. 2630 cal and 630. J
B. 2630 cal and 1.1 x 104 J
C. 1.1 x 10 + cal and 2630 J
D. 630. cal and 2630 J
E. None of these are correct.
I need help pls
Answers
Determine if the following reaction is a redox reaction. Use evidence from the equation to explain your reasoning.
Answers
A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.
The following reaction is a redox reaction based on the following evidence: 2Al + 3FeO → Al2O3 + 3Fe2+ In this reaction, Fe is being reduced because the FeO is changing to Fe2+. Additionally, the Al is being oxidized because it is losing electrons and forming Al2O3. Therefore, the reaction is a redox reaction. Let us take a look at the oxidation state of the elements in the given equation. Oxidation state of Al: (2) for the reactant and (3+) for the product. Oxidation state of Fe: (2+) for the reactant and (2+) for the product. Oxidation state of O: (-2) for the reactant and (-2) for the product. We can tell that oxidation is happening because of the increase in the oxidation state of Al from 2 to 3+. We can tell that reduction is happening because of the decrease in the oxidation state of Fe from 2+ to 2. As a result, the given equation is a redox reaction.For such more question on oxidizes
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3. What is the momentum of a bird whose mass is 0.4 kg and has a velocity of 19.0 m/s.
Answers
Note that the formula for momentum is P = mv, where P is momentum, m is mass, and v is velocity. This being said, simply apply the given data into the formula to find our solution.
\(P=mv\)
\(P=0.4\) × \(19.0\)
\(P = 7.6 kg *m/s\)
Hope this helps!
Describe the formation of the bond formed between carbon and oxygen.
Answers
Answer:
Polar Covalent Bond
Explanation:
Answer:Carbon forms a double bond to oxygen in aldehydes, ketones and acyl halides. In carboxylic acids, esters and anhydrides, each carbonyl carbon atom forms one double bond and one single bond to oxygen. In carbonate esters and carbonic acid, the carbonyl carbon forms one double bond and two single bonds to oxygen.
Carbon–oxygen bond - Wikipediahttps://en.wikipedia.org › wiki ›