Answer:
Fraction of association = 0.01
pH = 11
Explanation:
A weak base, B, is in equilibrium with water as follows:
B(aq) + H2O(l) ⇄ BH⁺(aq) + OH⁻(aq)
Where Kb is defined as:
Kb = 1.00x10⁻⁵ = [BH⁺] [OH⁻] / [B]
Some B will react producing BH⁺ and OH⁻:
[BH⁺] = X
[OH⁻] = X
[B] = 0.100M - X
As Kb <<< [B] we can say:
[B] ≈ 0.100M
Replacing:
1.00x10⁻⁵ = [X] [X] / [0.100]
1.00x10⁻⁶ = X²
X = 1x10⁻³M = [BH⁺] = [OH⁻]
The fraction of association is [BH⁺] / [B] = 1x10⁻³M / 0.100M = 0.01
As [OH⁻] = 1x10⁻³M, pOH = -log[OH⁻] = 3
pH = 14- pOH
pH = 11PLEASE HELP THIS IS DUE TODAY
Answer:
94.99%
Explanation:
Which statement about atoms is not correct
Answer:
Atoms are not able to exist independently.
Explanation:
Brainliest pls
What happened to solid materials when mixed with the liquid materials?
Answer:
the solid materials will disappear after mixing with a liquid material
plsss mark me as brainliest answer plsssssssss
Answer: go fk your dad you fkin whor
Carbon doesn't have a charge because it doesn't generally share or donate electrons.
*
True
O
False
Answer:
Correct me if i'm wrong but i'm pretty sure its FALSEExplanation:
Its because In a single bond, two carbon atoms share one pair of electrons. In a double bond, they share two pairs of electrons, and in a triple bond they share three pairs of electrons.2. Molecular solutions do not conduct electricity because they contain: *
(1 Point)
The ions are able to move freely from one place to another. So that they conduct electricity. But the molecular solutions does not electricity.
What is a molecular solution?The molecular solution is composed of molecules and consists of non - metallic atoms. These atoms are held together by the covalent bonds. The flow of charged particles is responsible for the conduction of electricity. If there is no flow of electrons or ions then there will be no electricity.
In the molecular solutions, the molecules present are not dissociated into respective ions. Since the molecules are not converted into the charged particles no electricity is produced.
A molecular solution is regarded as a non-electrolyte which does not contain ions. But electrolytes are dissociated into ions and thereby conducts electricity. So all electrolytes are good conductors of electricity.
Thus molecular solution does not contain ions.
To know more about solution, visit;
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state the difference between spermatozoon and spermatogonium
Answer:
spermatozoon:A spermatozoon is a motile sperm cell or moving from of the haploid cell that is the male gamete.
spermatogonium : A cell produced at an early stage in the formation of spermatozoa, formed in the wall of a seminiferous tuble and giving rise by mitosis to spermatocytes.
how fast is a formula 1 car? (For my chemistry project)
Answer:
it's 200 mph fast........
A scientist performs an experiment involving the collision of two masses on a flat surface. She believes she has made a startling discovery: the total kinetic energy is not conserved. What might she have overlooked?
A.
Some gravitational potential energy may have been gained.
B.
Some gravitational potential energy may have been lost.
C.
Some energy may have been gained due to friction and/or sound.
D.
Some energy may have been lost due to friction and/or sound.
Answer:
c
Explanation:
because the coldness in the ice cream and the suns gamma rays are hitting the ice cream and then it will start to melt. and that is why ice cream melts.
Answer:
...
Explanation:
Calculate the change in the molar Gibbs’ Free Energy when the volume of 1.0 mol Ar(g) held at 500 K is increased from 0.5 L to 4 L.
Answer:
energy and the equilibrium constant.
The sign of the standard free energy change ΔG° of a chemical reaction determines whether the reaction will tend to proceed in the forward or reverse direction.
Similarly, the relative signs of ΔG° and ΔS° determine whether the spontaniety of a chemical reaction will be affected by the temperature, and if so, in what way.
ΔG is meaningful only for changes in which the temperature and pressure remain constant. These are the conditions under which most reactions are carried out in the laboratory; the system is usually open to the atmosphere (constant pressure) and we begin and end the process at room temperature (after any heat we have added or which is liberated by the reaction has dissipated.) The importance of the Gibbs function can hardly be over-stated: it serves as the single master variable that determines whether a given chemical change is thermodynamically possible. Thus if the free energy of the reactants is greater than that of the products, the entropy of the world will increase when the reaction takes place as written, and so the reaction will tend to take place spontaneously. Conversely, if the free energy of the products exceeds that of the reactants, then the reaction will not take place in the direction written, but it will tend to proceed in the reverse direction.
A. 1
B. 2
C. 3
D. 4
_______________________________________________________
Please help with these questions ASAP will give brainlist!! CHEMISTRY
1.) A sample of nickel is heated to 95.0°C and placed in a coffee-cup calorimeter. If the 50.0 g of water in the calorimeter is initially 22.3°C and warms to 25.4°C, what mass of nickel was heated? (The specific heat of nickel is 0.444 J/°C g and water is 4.18 J/°C g.)
21.0 g
15.4 g
2.1 g
57.5 g
2.)What is the entropy change associated with the chemical reaction that occurs when iron oxide is converted to its metal form?
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
Positive
Zero
Cannot be determined
Negative
3.)The ΔH of the reaction below is -575.13 kJ. Is this reaction spontaneous?
2ZnS + 3O2 + C → 2SO2 + 2Zn + CO2
It is not because the ΔH of the reaction is negative.
It is because the ΔH of the reaction is negative.
It depends on the temperature because the ΔH of the reaction is negative and the ΔS is negative.
It depends on the temperature because the ΔH of the reaction is negative and the ΔS is positive.
4.) In the cell, the hydrolysis of ATP (adenosine triphosphate) into ADP (adenosine diphosphate) and a phosphate group has a ΔG of -50 kJ/mol. The reaction to convert glucose and a phosphate group into glucose-6-phosphate has a positive ΔG, but can be coupled with ATP hydrolysis to produce a spontaneous reaction. What can you infer about the formation of glucose-6-phosphate?
ATP → ADP + P; ΔG = -50 kJ/mol
Glucose + P → Glucose-6-phosphate; ΔG = + ?
The ΔS of the reaction that converts glucose and a phosphate into glucose-6-phosphate is positive.
The ΔG of the reaction that converts glucose and a phosphate into glucose-6-phosphate has a ΔG between 0 and +50 kJ/mol.
The ΔG of the reaction that converts glucose and a phosphate into glucose-6-phosphate has a ΔG between 0 and -50 kJ/mol.
The reaction will never occur in the cell.
Answer:
Question 1 is 21.0g
Explanation:
50 x 4.18 x 3.1 / 0.444 / 69.6= 21.0
For the reaction:
Agl(s) + V2Br2(g) AgBr(s) + /12 ()
AH° = -54.0 kJ
And:
AH® for AgBr(s) = -100.4 kJ/mol
AH° for Br2(g) = +30.9 kJ/mol
Therefore value of AH for Agl(s) must be:
+61.8 kJ/mol.
-61.8 kJ/mol.
O-123.5 kJ/mol.
+77.3 kJ/mol.
O-77.3 kJ/mol.
Answer:
0-77.3kj/mol
Explanation:
add all of the mole
Consider these two cases.
Case 1: An electron jumps from energy level 3 to energy level 7 in an atom.
Case 2: An electron jumps from energy level 3 to energy level 9 in an atom.
For case 1, what happens when an electron jumps from energy level 3 to energy level 7 in an atom?
A neutron is absorbed by the atom.
A photon is emitted by the atom.
A photon is absorbed by the atom.
A neutron is emitted by the atom.
Assuming that both cases describe Hydrogen‑like atoms with one electron, for which case is more energy emitted or absorbed?
More energy is emitted or absorbed for case 1.
The energy is the same for both cases.
More energy is emitted or absorbed for case 2.
It is impossible to tell.
Answer:
A photon is absorbed by the atom.
Explanation:
In case 2 where an electron jumps from energy level 3 to energy level 9, a photon is absorbed by the atom.
Photon is the basic unit of energy used to describe electromagnetic radiation.
When an electron moves from a lower energy level to a higher one, it absorbs energy. This energy is in form of photon. Level is a lower energy level compared to 9.II. A photon is absorbed by the atom.
It is the same scenario as case 2
III. More energy is emitted or absorbed for case 2.
More energy is emitted or absorbed for case 2 because the transition involves movement from a level to a greater level than that of case 1.
1. What type of pest control uses an organism's natural enemies?
A. Cultural
B. Mechanical
C. Chemical
D. Biological
Answer:Biological
Explanation:It’s a method of controlling pest such mites, insects and weeds.
A hutch weighs 150 lbs and it’s base has a length and width of 15 in and 34 in, respectively. What is the pressure exerted by the hutch on the floor?
Answer:0.29
Explanation:
To determine the pressure of the hutch on the floor, we must first calculate the area of the base of the hutch.
A=lw=(15in.)(34in.)=510in.2
We can now use the formula to calculate pressure.
P=FAP=150lbs510in.2P≈0.294lbin.2
Rounding to two significant figures, the pressure exerted by the hutch on the floor is 0.29lbin.2.
A factory produces their product at a rate of 102 kg/hr. How many lb/day of the product are produces? (453.6 g = 1 lb)
An octapeptide composed of four repeating glycylalanyl units has one free amino group on a glycyl residue and one free carboxyl group on an alanyl residue.Please draw structure and explain
Answer:
Following are the solution to this question:
Explanation:
The octapeptides are: [tex]gly-ala-gly-ala-gly-ala-gly-ala[/tex]
Its structure includes free glycine amino, and alanine residues free carboxylic. Its peptides are customarily extracted from the left side free NH2 residues as well as the right side free -COOH residues only in the same direction, the sequence is provided.
please find the structure in the attached file.
Which of the following elements has four shells?
K - magnesium
Li - Lithium
P - Phosphor
F - Fluorine
He - Helium
Select all the the abiotic factors that could impact a deer population.
Group of answer choices
Water
Other Organisms
Weather
Flies bringing disease
Answer:
Water
Weather
Explanation:
In an ecosystem, the factors that affect the organisms in that ecosystem can either be BIOTIC OR ABIOTIC. Biotic factors refers to the living components of an ecosystem while the ABIOTIC factors refer to the non-living components of the ecosystem.
According to this question, the abiotic (nonliving) factors that can affect a deer population includes WATER AND WEATHER. Note that the other options including flies and other organisms are both biotic factors.
Which of the following shows the abbreviation for an SI unit of density?
the aswer is g/ml hope is helpful
What is pure convalent bond
Answer:
Pure covalent bonds exist between two atoms with the same electronegativities. A pure covalent bond has no ionic character at all. Diatomic elements are good examples of pure covalent bonds where the electrons are evenly shared between both nuclei.
Explanation:
Hope this helped!
i don’t understand but i need help asap
Answer:
c
Explanation:
I think I remember this from last year
write the chemical formula of tetraphosporus osctasulfide
Answer:
P4S8 .
the chemical formula of Tetraphosporus osctasulfide is p4S8
Write a description of your dream car by using powerful adjectives. Write about 100-120 words
Answer:
It was a cold December night shortly after dusk, a likely setting for an event that would prove to be life altering. As fate would have it, this would be the night that I lost the material possession that truly meant the most to me. I would lose the one thing that gave me much pride and joy and excitement. I often think back and liken us to a newlywed couple, for we had only been together for 18 months and were still very much honeymooning. It was a night, a moment, that even now scoffs and mocks me as I travel thither and yonder with her replacement. But she can never be truly replaced and to call my current fix a replacement seems like a sort of blasphemy.
I called her my Blue Angel. That's right! She was a brand new 1999 Atlantic blue Ford Mustang fully equipped with white racing stripes on each side, dark window tint, a rear spoiler, and a post-factory sound system that I installed personally just to complete the "dream ride" effect. We met on April 24, 1999,when my parents introduced us and told me she was all mine as a reward for graduating high school as valedictorian. And what a reward she turned out to be. We went everywhere together. I took her out to eat. When I'd go play ball somewhere, she went with me. Every day from April 24, 1999, to December 22, 2000, we were together. We were bonding in a way a young man can bond with no other, and there truly was no other for me. Other guys had bigger trucks and faster cars, but where my Blue Angel was lacking in size and power, she more than made up for in pure, unadulterated, raw emotion, She never let me down; she was always looking her best and never longing for attention from me or any of the other countless admirers and fans she won over for...
Explanation:
20. What part of an atom exists in orbitals surrounding the nucleus?
A. electron
B. photon
C. neutron
D. proton
which of the following is true of the instinct approach to motivation
Match Term Definition
Pure substance A) Liquid homogeneous mixture in which the solute is distributed evenly within the solvent
Heterogeneous B) Mixture that has its different components mixed evenly within the substance
Homogeneous C) Mixture that has its different components mixed unevenly within the substance
Solution D) Consists of a single element or type of compound
Answer:
b
Explanation:
this should help
If 25.0g solid iron (III) sulfide reacts with 25.0g gaseous hydrogen chloride to form solid iron (III) chloride
and 5.61g hydrogen sulfide gas, what is the percent yield of the reaction?
(Please show work)
Answer:
[tex]Y=48\%[/tex]
Explanation:
Hello!
In this case, since the described chemical reaction is:
[tex]Fe_2S_3+6HCl\rightarrow 3H_2S+2FeCl_3[/tex]
We can see the 6:2 mole ratio between hydrogen chloride (molar mass = 36.46 g/mol) and hydrogen sulfide (molar mass = 34.09 g/mol) and 1:3 between iron (III) sulfide (molar mass = 207.91 g/mol) and hydrogen sulfide. In such a way, we can compute the yielded moles of hydrogen sulfide by each reactant in order to identify the limiting one:
[tex]n_{H_2S}^{by HCl}=25.0gHCl*\frac{1molHCl}{36.46gHCl}*\frac{3molH_2S}{6molHCl} =0.343molH_2S\\\\n_{H_2S}^{by Fe_2S_3}=25.0gFe_2S_3*\frac{1molFe_2S_3}{207.91gFe_2S_3}*\frac{3molH_2S}{1molFe_2S_3} =0.361molH_2S[/tex]
It means that the HCl is the liming reactant as it produces less moles of hydrogen chloride than the iron (III) sulfide. Therefore, the theoretical yield in grams is:
[tex]m_{H_2S} =0.343molH_2S_2S*\frac{1molH_2S}{34.09gH_2S}\\\\m_{H_2S}=11.7g[/tex]
Thus, the percent yield is:
[tex]Y=\frac{5.61g}{11.7g}*100\%\\\\Y=48\%[/tex]
Best regards!
What is the state of ice at room temperature?