Answer:
[tex]\% diss = 50\%[/tex]
Explanation:
Hello there!
In this case, when considering weak acids which have an associated percent dissociation, we first need to set up the ionization reaction and the equilibrium expression:
[tex]HA\rightleftharpoons H^++A^-\\\\Ka=\frac{[H^+][A^-]}{[HA]}[/tex]
Now, by introducing x as the reaction extent which also represents the concentration of both H+ and A-, we have:
[tex]Ka=\frac{x^2}{[HA]_0-x} =10^{-4.74}=1.82x10^{-5}[/tex]
Thus, it is possible to find x given the pH as shown below:
[tex]x=10^{-pH}=10^{-4.74}=1.82x10^{-5}M[/tex]
So that we can calculate the initial concentration of the acid:
[tex]\frac{(1.82x10^{-5})^2}{[HA]_0-1.82x10^{-5}} =1.82x10^{-5}\\\\\frac{1.82x10^{-5}}{[HA]_0-1.82x10^{-5}} =1\\\\[/tex]
[tex][HA]_0=3.64x10^{-5}M[/tex]
Therefore, the percent dissociation turns out to be:
[tex]\% diss=\frac{x}{[HA]_0}*100\% \\\\\% diss=\frac{1.82x10^{-5}M}{3.64x10^{-5}M}*100\% \\\\\% diss = 50\%[/tex]
Best regards!
Match the word to the definition
Question 1 options:
simple diffusion
osmosis
facilitated diffusion
1.
Molecules move from high to low concentration
2.
Molecules move from high to low concentration with a transport protein
3.
Diffusion of water through a selectively permeable membrane
PLEASE HELP!!
Which statement describes the first step in soil formation?
A: Small, simple plants begin to grow.
B: Parent rock breaks into smaller pieces.
C: Humus begins to mix with sediment.
D: Organic material starts decomposing.
Answer:
B: Parent rock breaks into smaller pieces.
Explanation:
Weathering the first step in the process of soil formation. The process of breaking up off the parent rocks into simple forms, is termed as weathering. The formation of soil is a very gradual and slow process. It takes millions of years for the rocks to become soil. The dead and decaying matter of plants and animals are also included in the rocks. Water, sun, climatic conditions and rain are some of the factors that effect weathering.
Answer:
32
Explanation:
I found it
a container contains 5L of nitrogen gas at 25°C. what will be it's volume if the temperature increases by 35°C keeping the pressure constant
Answer:
5.168 L
Explanation:
Applying Charles Law,
V/T = V'/T'..................... Equation 1
Where V = Initial Volume, T = Initial Temperature in Kelvin, V' = Final Volume, T' = Final Temperature in Kelvin,
Make V' the subject of the equation,
V' = VT'/T................. Equation 2
From the question,
Given: V = 5L, T = 25°C = (25+273) = 298K, T' = 35°C = (35+273) = 308K
Substitute these values into equation 2
V' = (5×308)/298
V' = 5.168 L
How much more acidic is 1 to 9
Answer:
Number one is the most acidic, the one in the middle is neutral, and number nine is alkaline.
Please help me on this!!
Answer:
OK
Explanation:
OK
1. A mixture of 3 gases (A, B, and C) has a total pressure of 240kPa. If the partial pressure of
Gas A is 107 kPa and the partial pressure of Gas B is 55 kPa, what is the partial pressure of
Gas C?
Answer:
78 kPa
Explanation:
The total pressure is the sum of the partial pressures:
240 = Pa + Pb + Pc
240 = 107 + 55 + Pc
Pc = 78 kPa
Answer:
78 kPa
Explanation:
Place in order from smallest to largest: planet, galaxy, solar system, star, universe Question 3 options: star, planet, solar system, galaxy, universe universe, galaxy, solar system, star, planet galaxy, universe, solar system, star, planet planet, star, solar system, galaxy, universe
Answer:
planet, star, solar system, galaxy, universe
plz mark me as brainliest.
Which two compounds of oxygen are small molecules?
Explain why metals conduct electricity. Refer to structure and bonding in your answer
Answer:
They are electrical conductors because their delocalised electrons carry electrical charge through the metal.
Explanation:
for the second ques
not sure...
What is the thermal energy needed to vaporize 18.02g of water at 100°C? The Heat of Vaporization for water is 40.650 kJ/mol.
Answer:
40.7 kJ
Explanation:
Applying,
q = c'n.................. Equation 1
Where q = Thermal Heat, c' = Heat of vaporization of water, n = number of mole of water.
But,
n = mass(m)/Molar mass(m')
n = m/m'............... Equation 2
Substitute equation 2 into equation 1
q = c'(m/m')............. Equation 3
Given: c' = 40.650 KJ/mol, m = 18.02 g
Constant: m' = 18 g/mol
Substitute into equation 3
q = 40.650(18.02/18)
q = 40.695 kJ
q ≈ 40.7 kJ
Explain why the sharp edge of knife cuts easily through bread than the blunt of the same knife
Answer:
because its sharper...
A short-lived structure formed during a collision is a(n)
a. reagent.
b. catalyst.
c. activated complex.
d. inhibitor.
Answer:
c. activated complex
Explanation:
What are the symbols (in order) for hydrogen, sodium and nitrogen?
Answer:
H, Na, N
Explanation:
Answer:
H, NA, N
Explanation
Chemistry Questions
5) What is matter? Mention the characteristic of particles of matter.
Answer:
As known matter is anything that occupies space and has mass.
BRAINLIESTT
The pH of a solution is 8.43. What is it {H3O+}concentration?
A. 3.7 x 10-3
B. 2.7 x 10-6
C. 1.0 x 10-14
D. 1.0 x 10-8.43
Answer: D. [tex]1.0\times 10^{-8.43}M[/tex]
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydronium ion concentration.
[tex]pH=-\log [H_3O^+][/tex]
Putting in the values:
[tex]8.43=-\log[H_3O^+][/tex]
[tex][H_3O^+]=10^{-8.43}=3.7\times 10^{-9}M[/tex]
Thus [tex][H_3O^+][/tex] concentration is [tex]10^{-8.43}M[/tex]
In science lab, Ellie combined sugar and distilled water. Ellie made
A. a mixture, which must be separated by chemical processes.
B. a compound, which must be separated by chemical processes.
C. a mixture, which can be separated through physical processes.
D. a compound, which can be separated through physical processes.
Answer:
C
Explanation:
How many moles of copper would be needed to make one mole of cu2o?
Answer:
Explanation:
You can view more details on each measurement unit: molecular weight of Copper(I) Oxide or grams The molecular formula for Copper(I) Oxide is Cu2O. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Copper(I) Oxide, or 143.0914 grams.
Gold is classified as what type of element?
How many grams of carbon dioxide are produced when 2.05 moles of octane (C8H18)
combust?
2C3H18 (1) + 2502 (g) --> 16CO2 (g) + 18H20 (g) (balanced)
Did you ever get the answer
HELP ME PLEASE
Iron is a metal. Which property would you expect it to have?
A. It is a bad conductor of heat.
B. It is a gas at room temperature,
C. It is a good conductor of electricity
D. It has little or no shine
Answer: it is a good conductor of electriciy tht is what wires are made of and it is a good conductor of heat so it will be able to handle the heat from the electricity
Explanation:
Answer:
Iron is a shiny, bright white metal that is soft, malleable, ductile and strong. Its surface is usually discolored by corrosion, since it combines readily with the oxygen of the air in the presence of moisture. In absolutely dry air, it does not rust
Explanation:
I hope it helps
Which advantage do multicellular organisms have over unicellule organisms
Answer:
Multicellular organisms thus have the competitive advantages of an increase in size without its limitations. They can have longer lifespans as they can continue living when individual cells die. Multicellularity also permits increasing complexity by allowing differentiation of cell types within one organism.
Grants are money for education that students can use and not pay back. Of those listed, which one is an example of a grant.
A) AID
B) PELL
C) PLUS
D) Stafford and Perkins
Aid is money given to students for education funding which may not be paid back.
What is aid?The term aid may be used to refer to money given to a person for a particular purpose which the person may not be required to pay back. Often students are given this sort of assitance to fund their education.
Hence, grants given to students to finance their education which they may not pay back are called aid.
Learn more about grant: https://brainly.com/question/1559476
When the equation Al + Br2 → AlBr3 is balanced, the coefficient for Br2 isSingle choice.
Answer:
The answer should be 2 because to balance the equation you should have to change to equation to this; 2Al + 3Br2 => 2AlBr3, so that there is a total of 2 Aluminums and 6 Bromiums on either side of the equation.
Explanation:
In the given chemical equation, the coefficient of bromine is 2.
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
Learn more about chemical equation,here:
https://brainly.com/question/28792948
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plz help me 14 points
What is the molecular geometry of a molecule with 2 outer atoms and 3 lone pairs on the central atom?
Answer:
See explanation
Explanation:
The valence shell electron pair repulsion theory states that the number of electron pairs on the valence shell of the central atom of a molecule determines the shape or geometry of the molecule.
For a molecule having two bonding pairs and three lone pairs, the shape should based on a trigonal bipyramid. However, the molecular geometry is linear with a bond angle of 180 degrees.
The difference between sunspots solar flares and prominence
Answer:
Sunspots are cooler and darker than the rest of the Sun's surface. They are marked by intense magnetic activity. Solar prominences are the plasma loops that connect two sunspots. Solar flares and coronal mass ejections are eruptions of highly energetic particles from the Sun's surface.
Explanation:
Answer:
Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. They appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. They are extremely hot (10 to 20 million degrees Celsius) and extend into the corona. Solar flares occur near sunspots and can disturb radio communications on Earth.
Explanation:
The layer of the Sun's atmosphere that we can see is the photosphere
True
False
Answer:
Pretty sure its True
Explanation:
I'm taking k12 astronomy
Please help I’ll mark you brainiest if it’s correct. There is 3 answers to this one!
Answer:
c,e,f
Explanation:
Judging by what i tried to find out about this reaction, it seems that won't take place, though it could be wrong.
Thank you to anyone who answers correctly ;w; (and if you tried)
What is the Kp for the decomposition of ammonia (if the reaction is at 500°C)?
2 NH3(g) N2(g) + 3 H2(g)
Answer:
Kp = 4.5 x 10⁻⁹
Explanation:
from equilibrium of gas phase rxns, Kp = Kc(R·T)^-Δn
2NH₃(g) ⇄ 3H₂(g) + N₂(g)
2Vm 3Vm 1Vm
Δn = ∑Vm(products) - ∑Vm(reactants) = (3Vm + 1Vm) - 2Vm = 2Vm = +2
Kc = Kb = [H₂]³[N₂]/[NH₃]² = 1.8 x 10⁻⁵M²
R = 0.08206 L·atm/mol·K
T = 500°C = (500 + 273)K = 773K
Kp = Kb(R·T)^-Δn = 1.8 x 10⁻⁵M²[(0.08206L·atm/mol·K)(773K)]⁻⁽⁺²⁾
= (1.8 x 10⁻⁵mol²/L²)(63.43atm/mol)⁻²
= 4.5 x 10⁻⁹atm
Hope this helps. :-)
Where would you have to be to see the view shown above? Explain.
HSO4, + NaNo, → HNO2, + Na2SO4
WHAT IS THE BALANCE OF THIS EQUATION
Answer:
H2SO4 + 2NaNO2 → 2HNO2 + Na2SO4
Explanation:
Explanation:
[tex]H _{2} SO _{4} \: + \:2 NaNO_{2} - - - > 2HNO _{2} \: + \: Na _{2}SO _{4}[/tex]
Place 2 in nitrous acid and sodium nitrite to balance the equation as shown above
