Answer:
0.692
Explanation:
To solve this problem we can use Henderson-Hasselbach's (H-H) equation:
pOH = pKb + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]In which pOH can be calculated from the pH:
pOH + pH = 14pOH = 14 - pH = 14 - 9.09pOH = 4.91Then we use the H-H equation to calculate[tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
4.91 = 4.75 + log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex]0.16 = log [tex](\frac{[NH_4Cl]}{[NH_3]})[/tex][tex]10^{0.16}[/tex] = [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex][tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]= 1.44As the problem asks for the ratio of ammonia to ammonium chloride, we invert [tex]\frac{[NH_4Cl]}{[NH_3]}[/tex]:
[tex]\frac{[NH_3]}{[NH_4Cl]}=\frac{1}{1.44}[/tex] = 0.692The mole ratio of ammonia to ammonium chloride in a buffer with a pH of 9.09 is 0.692.
How we write Henderson Hasselbalch equation?Henderson Hasselbalch equation for the weak base (NH₃) and for their conjugate acid (NH₄Cl) will be written as:
pOH = pKb + log[NH₄Cl]/[NH₃], where
pKb = base dissociation constant = 4.75
pOH will be calculated from the given value of pH as:
pH + pOH = 14
pOH = 14 - 9.09 = 4.91
Now we these values in the above equation and we get,
4.91 = 4.75 + log[NH₄Cl]/[NH₃]
log[NH₄Cl]/[NH₃] = 0.16
[NH₄Cl]/[NH₃] = 10⁰°¹⁶
[NH₄Cl]/[NH₃] = 1.44
[NH₃]/[NH₄Cl] = 1/1.44
[NH₃]/[NH₄Cl] = 0.692
Hence, required mole ratio is 0.692.
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Once the chicken has reached 0ºC, you can add it to the sous-vide cooker (the Yeti cooler). What is the change in temperature (ºC) of the chicken during the sous-vide cooking process if the equilibrium temperature is 74ºC?
Do not include units with your answer.
Answer:
Change in temperature = 74
Explanation:
The initial Temperature of the chicken is given as 0° C. Then the question states that the chicken is added to sous-vide cooker. And the final equilibrium temperature after cooking is given as 74°C. The equilibrium temperature means that the temperature of each component in the system, such as cooker and chicken is same, which is 74°C. So, we have:
Initial Temperature = 0
Final temperature = 74
Therefore, the change in temperature during cooking will be:
Change in Temperature = Final Temperature - Initial temperature
Change in Temperature = 74 - 0
Change in temperature = 74
The solvolysis product of 1-bromo-2,2-dimethylbutane with ethanol initially forms the expected cation but does not give any of the expected 1-ethoxy-2,2-dimethylbutane. Draw the rearranged cation that will eventually lead to the product. Interactive 3D display mode
Answer:
See image attached and explanation
Explanation:
I have attached a detailed mechanism of the reaction to this answer. This reaction occurs by SN1 mechanism. It implies that the transition state involves a carbocation.
However, the initial carbocation formed is a primary carbacation. Remember that the order of stability of carbocations is methyl< primary < secondary< tertiary. This means that tertiary carbocations are the most stable carbocations. Tertiary carbocations are those in which the carbon atom bearing the carbon atom is attached to three other carbon atoms.
In the mechanism below, the substrate converts from a primary to a tertiary cabocation (most stable) by a 1,2-alkyl shift as shown giving the 3-ethoxy-3-methylpentane product.
Indicate whether each of the following statements about the heme-binding site in myoglobin is true or false. If you think a statement is false, explain why.
a. The proximal histidine covalently binds iron.
b. The distal histidine covalently binds oxygen.
c. The distal histidine binds iron
d. Free heme binds CO with the Fe, C and O atoms in a linear array.
e. The iron in heme binds the oxygen atom of CO
Answer:
A. True
B. False
C. False
D. True
E. False
Explanation:
A. The proximal histidine covalently binds iron.
This statement is true because the proximal histidine is covalently bonded to the fifth coordination position of iron in myoglobin
B. The distal histidine covalently binds oxygen.
This statement is false because the distal histidine interacts with the oxygen covalently bonded to the sixty coordination position of iron by means of a hydrogen bond not a covalent bond.
C. The distal histidine binds iron
This statement is false because the distal histidine is not bonded to iron but to oxygen but stabilizes the oxygen bonded to iron
D. Free heme binds CO with the Fe, C and O atoms in a linear array.
This statement is true because free heme has more affinity for CO than O2 as it has the least steric hindrance when the Fe, C, and O atoms lie in a straight line. On the other hand, when O2 binds to free heme, the axis of the oxygen molecule is positioned at an angle to the Fe-O bond thereby producing significant steric hindrance.
E. The iron in heme binds the oxygen atom of CO.
This statement is false because the iron in heme binds to the carbon atom, C, of CO rather than to oxygen atom.
Determine whether a precipitate will form when 0.96g of Na2CO3 is combined with 0.20g BaBr2 in a 10 L solution.
Answer:
Qsp > Ksp, BaCO3 will precipitate
Explanation:
The equation of the reaction is;
Na2CO3 + BaBr2 -------> 2NaBr + BaCO3
Since BaCO3 may form a precipitate we can determine the Qsp of the system.
Number of moles of Na2CO3 = 0.96g/106 g/mol = 9.1 * 10^-3 moles
concentration of NaCO3 = number of moles/volume of solution = 9.1 * 10^-3 moles/10 L = 9.1 * 10^-4 M
Number of moles of BaBr2 = 0.20g/297 g/mol = 6.7 * 10^-4 moles
concentration of BaBr2 = 6.7 * 10^-4 moles/10 L = 6.7 * 10^-5 M
Hence;
[Ba^2+] = 6.7 * 10^-5 M
[CO3^2-] = 9.1 * 10^-4 M
Qsp = [6.7 * 10^-5] [9.1 * 10^-4]
Qsp = 6.1 * 10^-8
But, Ksp for BaCO3 is 5.1*10^-9.
Since Qsp > Ksp, BaCO3 will precipitate
Precipitate of BaCO₃ will form when 0.96g of Na₂CO₃ is combined with 0.20g BaBr₂ in a 10 L solution.
In which condition precipitate will form?
Precipitate will form in the reaction if for the given reaction value of Qsp i.e. solubility product quotient is more than Ksp i.e. solubility product constant.
Given chemical reaction is:
Na₂CO₃ + BaBr₂ → 2NaBr + BaCO₃
We can calculate the concentration of reactants in terms of molarity, as no. of moles of solute present in per liter of solution.
And moles will be calculate as n = W/M, where
W = given mass
M = molar mass
Given mass of Na₂CO₃ = 0.96g
Moles of Na₂CO₃ = 0.96g / 106 g/mol = 9.1×10⁻³ moles
Volume of solution = 10L
Concentration of Na₂CO₃ = 9.1×10⁻³ moles/10L = 9.1×10⁻⁴ M
Given mass of BaBr₂ = 0.20g
Moles of BaBr₂ = 0.20g / 297g/mol = 6.7×10⁻⁴ moles
Concentration of BaBr₂ = 6.7×10⁻⁴ moles/10L = 6.7×10⁻⁵ M
Qsp will be calculated as the product of their concentration:
Qsp = (9.1×10⁻⁴)(6.7×10⁻⁵) = 6.1×10⁻⁸
And value of Ksp for BaCO₃ = 5.1×10⁻⁹
From this we conclude that BaCO₃ will form precipitate.
Hence, precipitation of BaCO₃ takes place.
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WHAT IS THE CONCENTRATION, IF A SOLUTION IS PREPARED BY DISSOLVING 90ML OF HYDROGEN PEROXIDE IN ENOUGH WATER TO MAKE 3000ML OF SOLUTION
Answer:
30%
Explanation:
Chemical concentrations are general defined as the ratio between amount of solute (Less amount compound, hydrogen peroxide) and amount of solvent or solution (More amount, water).
For example, volume/volume percentage -(V/V%)- is defined as 100 times the ratio between volume of solute (90mL of hydrogen peroxide) and volume of solution (300mL of solution), that is:
V/V% = 90mL / 300mL * 100 =
30%
Ionic bonding accurs when
Explanation:
An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom losing one or more electrons becomes a cation—a positively charged ion. The atom gaining one or more electron becomes an anion—a negatively charged ion.
The location oon the surface of the Earth directly above the focus of an earthquake
is called the
A.focus point
B.seismic wave
C.epicenter
Answer:
I think its epicenter
Explanation:
The epicenter is the point on the earth's surface vertically above the hypocenter, point in the crust where a seismic rupture begins.
Calculate the energy of a light with a wavelength of 142 nm.
Answer:
E = 0.14 ×10⁻¹⁷ J
Explanation:
Given data:
Wavelength of light = 142 nm (142 ×10⁻⁹ m)
Energy of light = ?
Solution:
Formula:
E = hc/λ
h = plancks constant = 6.63×10⁻³⁴ Js
c = speed of light = 3×10⁸ m/s
by putting values
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 142 ×10⁻⁹ m
E = 19.89×10⁻²⁶ J.m/ 142 ×10⁻⁹ m
E = 0.14 ×10⁻¹⁷ J
HELP I DONT UNDERSTAND?!
Answer:
Remain the same
Explanation:
If water dose no effect why would the moist air make a change
Cell structure escape room
Can someone help me with this?
Answer:
maybe try 3825?
Explanation:
if not comment on this and ill try something else
or you can also just use those numbers in different order
Answer:
Explanation:
I think it is A=3 B=8 C=4 D=5
09:10 .l . KS
?
PT/02/2020 - Science
04
Which of the following substance can 0.5
be used to test hardness of water.?
A. Detergent
B. Soap solution
C. Ethanol solution
D. Ether
Mark for review
PREV
NEXT
Answer:
B. Soap solution
Explanation:
Hardness of water refers to the degree of calcium and magnesium in the water. In other words, hard water contains excessive mineral contents. The degree of hardness of a water body can be measured using the SOAP TEST KIT.
Due to the formation of insoluble minerals, soap forms an exvessive substance in the presence of hardwater because the particles or minerals contained in the water is reacting to form something insoluble. Hence, a SOAP test kit can be used to test the hardness of water.
help DUE IN 5 min!! Which of the following is also NOT accepted as evidence for Plate Tectonic Theory?
A) similar reptile fossils found on different continents
B) seashells found on top of the Himalayan Mountains
C) upwelling of magma from volcanoes located on various continents
D )fern and palm tree fossils found in Antarctica
what are the products of pent-1-ene + hydrogen
Answer:
But-1-ene is another unsymmetrical alkene. As with all alkenes, unsymmetrical alkenes like propene react with hydrogen bromide in the cold. The double bond breaks and a hydrogen atom ends up attached to one of the carbons and a bromine atom to the other. In the case of propene, 2-bromopropane is formed.
Explanation:
Tomato juice containing 7% solids by mass is fed to an evaporator and water is removed at a rate of 500 kg/h. If the concentration is to contain 35% solids, then determine the necessary feed rate.
Answer:
Feed rate F = 625 kg/h
Explanation:
Given that:
percentage mass of the solids = 7% = 0.07
rate of removal of water W = 500 kg/h
Concetration C = 35% = 0.35
To fine the feed rate = ???
Using the Overall balance equation,
Suppose: F = W + C
F = 500 + C ---- (1)
Then, the Solids balance can be computed as:
(0.07)F = (0)500 + (0.35)C
0.07F = 0.35C
C = 0.07F/0.35
C = 0.2F
Now
F = 500 + 0.2F
Collect like terms
F – 0.2F = 500
0.8F = 500
F = 500/0.8
F = 625 kg/h
Therefore, the feed rate F = 625 kg/h
In a coupled reaction, energy needs to be created to drive a second reaction forward. True or false
Answer:
I would say false.
Explanation:
Hope it helps:)
During a chemical reaction, heat is absorbed. What kind of reaction occurred?
A) An endothermic reaction
B) An exothermic reaction
Answer:
Endothermic and exothermic reactions are chemical reactions that absorb and release heat, respectively. A good example of an endothermic reaction is photosynthesis. Combustion is an example of an exothermic reaction. The categorization of a reaction as endo- or exothermic depends on the net heat transfer.
Explanation:
Answer:
An endothermic reaction
Explanation:
The heat is being absorbed so it's and endothermic reaction
How does the electron structure of each substance affect the properties of compounds that it forms?
Answer:
All of these properties are due to the chemical structure of the compound. The chemical structure includes the bonding angle, the type of bonds, the size of the molecule, and the interactions between molecules. Slight changes in the chemical structure can drastically affect the properties of the compound.Some atoms become more stable by gaining or losing an entire electron (or several electrons). When they do so, atoms form ions, or charged particles. Electron gain or loss can give an atom a filled outermost electron shell and make it energetically more stable.
Explanation:
The chemical structure of the compound is responsible for all of these properties. The chemical structure includes the bonding angle, bond type, molecule size, and intermolecular interactions. Slight changes in the chemical structure can have a significant impact on the compound's properties.
What is compound ?A chemical compound is a substance made up of many identical molecules that contain atoms from more than one chemical element and are held together by chemical bonds. A molecule made up of only one element's atoms is thus not a compound.
An atom's valence shell electrons determine how it interacts with neighboring atoms, and thus its chemical properties. Because sodium and lithium both have one valence electron, their chemical properties are similar.
The number of electrons in an atom's outermost shell determines its reactivity, or proclivity to form chemical bonds with other atoms. This outermost shell is referred to as the valence shell, and the electrons found within it are referred to as valence electrons.
Thus, The chemical structure of the compound is responsible for all of these properties.
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If an ionic compound is made of Cl- and Fe2+,
the compound will be called Iron (___) chloride
Answer:
iron dichloride
Electromagnetic Waves can propagate (move through);
Answer:
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
Explanation:
whats two answers I know B is wrong
Answer:A and D
Explanation:
Answer:
C and D
Explanation:
IF CORRECT PLEASE GIVE ME BRAINLLEST!!!!!!!!!!
IF NOT PLEASE TELL ME, AND IF YOU KNOW, WHY!!!!!!
THANKS!!!!!!!!!!!
◑﹏◐:-)O_o(○’ω’○)∩﹏∩↖(^ω^)↗o_O(ToT)^O^囧rzB-)
The number the represents a neutral pH is______.
Numerical Answers Expected.
Answer:
7 is the answer as per the question
Answer: The number that represents a neutral pH is (7)
Explanation:
I took the test on flvs and got it right.
100% Guaranteed Correct :)
, Hope this helps
Have a great day!!
What are some ways we can monitor earthquakes ?
Answer:
Earthquakes are measured using instruments called seismometers, that detect the vibrations caused by seismic waves as they travel through the crust. Also, laser beams can be used
Explanation:
A) What is the wavelength of electromagnetic radiation that has a frequency of 5.97 x 10MHz? (1 MHz = 1 x 10 Hz)
Answer:
rrgffffffffffrrrddhgf
Explanation:
trrdfgfxfff
What is bonding all about in chemistry?
Answer:
It is like about a attraction between atoms, molecules, and more.
what is effects of azeotrope system?
Answer:
An azeotrope or a constant boiling point mixture is a mixture of two or more liquids whose...Such a system of solvents is known as a heteroazeotrope. ... that will affect the volatility of one of the azeotrope constituents more than another.
Explanation:
Azeotrope, in chemistry, a mixture of liquids that has a constant boiling point because the vapor has the same composition as the liquid mixture. The boiling point of an azeotropic mixture may be higher or lower than that of any of its components.
The nonvolatile, nonelectrolyte TNT (trinitrotoluene), C7H5N3O6 (227.1 g/mol), is soluble in benzene C6H6. How many grams of TNT are needed to generate an osmotic pressure of 5.14 atm when dissolved in 279 ml of a benzene solution at 298 K. grams TNT
Answer:
Explanation:
formula of osmotic pressure is as follows
p= n RT
n is mole of solute per unit volume
If m be the grams of solute needed
m gram = m / 227.1 moles
m / 227.1 moles dissolved in .279 litres
n = m / (227.1 x .279 )
= m / 63.36
substituting the values in the osmotic pressure formula
5.14 = (m / 63.36) x .082 x 298
m / 63.36 = .21
m = 13.32 grams .
If an equal number of moles of the weak acid HF and the strong base KOH are added to water, is the resulting solution acidic, basic, or neutral
Answer:
Being a weak acid and a strong base, where it is diluted in a neutral medium such as water, the basic medium predominates, almost alkaline pH.
Explanation:
The acidity of the solution, being weak, means that its pH is not so low, therefore it will be easier to reach the values of 7 or 7 where alkalinity or basity is indicated.
Answer:
If an equal number of moles of the weak acid HF and the strong base KO are added to water,
The resulting solution is basicHF + KOH ----> KF + [tex]H_2O[/tex]
weak strong salt
acid base
The salt formed is KF which is a basic salt since it is formed by reaction of weak acid and strong base
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What is Scientific definition of a compound?
5. An example of a muscle that is voluntarily controlled is a muscle that
A. Makes the leg move.
B. Makes the heart pump.
C. Squeezes blood through vessels.
D. Squeezes food in the stomach.
Answer:
A, Makes the leg move
Explanation:
a student is walking home from school. after 5 minutes it starts to rain lightly, so the student walks a little faster. after another 2 minutes it starts to rain hard, and the student runs the rest of the way home. the total time the student takes to get home in 10 minutes. which gragh below best represents the students motion during the trip home.
Answer:
A
Explanation:
complete question with the graphs are attached to this answer.
Let us consider the question closely. When the student was walking home, his/her speed was uniform. However, after 5 minutes, the student increased his/her pace due to the light rain. This is seen as a slight increase in speed after 5 minutes on the graph A. two minutes after (at the 7th minute) the rain comes hard and the student had to increase his/her speed by a much higher magnitude by running and maintaining this uniform speed all the way untill the end of the journey at the 10th minute.
