Answer:
1.64mL of 5.80M are added
Explanation:
First, we need to calculate total moles of acetic buffer. Then, with H-H equation, we need to find ratio of moles of acetate and acetic acid.
The moles of acetate increased are due the addition of moles of NaOH. Thus, we can find the volume of 5.80M NaOH that must be added:
Moles acetic acid and sodium acetate:
Acetic acid: 0.550L * (0.0215mol/L) = 0.011825 moles
Acetate: 0.550L * (0.0255mol/L) = 0.014025 moles
Total moles = 0.02585 moles = [Acetate] + [Acetic acid] (1)
H-H equation:
pH = pKa + log [Acetate] / [Acetic acid]
Where pH is 5.75;
pKa of acetic acid is 4.74;
And [ ] could be taken as moles of each species.
5.75 = 4.74 + log [Acetate] / [Acetic acid]
10.2329 = [Acetate] / [Acetic acid] (2)
Replacing (1) in (2):
10.2329 = 0.02585 - [Acetic acid] / [Acetic acid]
10.2329[Acetic acid] = 0.02585 - [Acetic acid]
11.2329[Acetic acid] = 0.02585
[Acetic acid] = 0.002301 moles.
Moles acetate:
[Acetate] = 0.02585 moles - 0.002301 moles = 0.023549 moles
Initial moles were 0.014025 moles, moles of acetate added (Due the addition of NaOH) are:
0.023549 moles - 0.014025 moles = 0.009524 moles of NaOH
Volume is:
0.009524 moles of NaOH * (1L / 5.80mol) = 1.64x10⁻³L = 1.64mL of 5.80M are added
A buffer solution is a solution consisting of a weak base and conjugate acid or vice versa. 1.64 mL of 5.80M NaOH must be added to increase pH.
What is volume?Volume is the space or the area is occupied by a substance. It is calculated in milliliters, liters, etc.
Moles of acetic acid: [tex]0.550 \times 0.0215 = 0.011825 \;\rm moles[/tex]
And, moles of acetate: [tex]0.550 \times 0.0255 = 0.014025 \;\rm moles[/tex]
Now, the total moles = 0.02585 moles (equation 1)
Using the pH equation the ratio of moles of acetate and acetic acid is calculated as:
[tex]\begin{aligned} \rm pH& =\rm pKa + log \dfrac{[Acetate]}{[Acetic \;acid]}\\\\5.75 &= 4.74 +\rm log\dfrac {[Acetate]}{[Acetic \;acid]}\\\\10.2329 &= \rm \dfrac{[Acetate]}{[Acetic \;acid]} \rm .....(equation 2) \end{aligned}[/tex]
Now replacing the value of equation 1 in 2:
[tex]\begin{aligned}10.2329 &= 0.02585 - \rm \dfrac{[Acetic acid]}{[Acetic \;acid]}\\\\10.2329[\rm Acetic \; acid] &= 0.02585 - [\rm Acetic \; acid]\\\\&= 0.002301 \;\rm moles\end{aligned}[/tex]
Moles of acetate is calculated as:
0.02585 moles - 0.002301 moles = 0.023549 moles
The added moles of sodium hydroxide are: 0.023549 moles - 0.014025 moles = 0.009524 moles
Volume is calculated as:
[tex]0.009524\; \text{moles of NaOH}\times (1 \;\rm L / 5.80 \;\rm mol) = 1.64 \times 10 ^{-3}\;\rm L[/tex]
Therefore, 1.64 mL of 5.80 M sodium hydroxide should be added.
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Calculate the number of joules needed to change the temperature of 40.0 g of water from 33.0 degree c to 43.0 degree c
Answer:
c
Explanation:
2. Use the picture below to answer the question. ** С D B Bob is riding a roller coaster. At vihat point does the car have the most potential energy? А A 3
Answer:
the answer is A
Explanation:
Answer:
a
Explanation:
the roller coaster is at the highes pont witch is a .
is pH used to classify compounds?
Answer:
The pH scale is used to rank solutions in terms of how acidic or how basic they are. It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution. ... This pH value of 7 is important because it indicates a neutral solution. All other substances are compared to this neutral point.
I hope I have helped :)
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The following reaction shows calcium chloride reacting with silver nitrate.
CaCl2 + 2AgNO3 → 2AgCl + Ca(NO3)2
How many grams of AgCl are produced from 30.0 grams of CaCl2?
(Molar mass of Ca = 40.078 g/mol, Cl = 35.453 g/mol, O = 15.999 g/mol, Ag = 107.868 g/mol, N = 14.007 g/mol)
A. 19.4 grams
B. 38.8 grams
C. 58.2 grams
D. 77.5 grams
Explanation:
Molar mass of CaCl2 = 110.98g/mol
Moles of CaCl2 = 30.0 / 110.98 = 0.270mol
Moles of AgCl = 0.270mol * 2 = 0.540mol
Mass of AgCl = 0.540mol * (143.32g/mol) = 77.39g.
Answer:
77.5
Explanation:
You gotta round.
Hope this helps :)
How many moles of H atoms are there in 2 moles of CH3CH2CH2CH3?
AnSweR: 10
ExplanAtion: My random idiot friend just told me
a 125 torr mixture of c2h4(g) and c3hg(g) at a given temperature was burned in excess oxygen in a rigid, sealed container. the product c02( g) was collected under the same initial reaction conditions and determined to be 280 torr. what was the mole fraction of c2h4(g) in the original mixture
Answer:
0.24
Explanation:
C2H4(g) + 3O2(g) ------> 2CO2(g) + 2H2O(g)
C3 H8 (g) + 5O2 (g) → 3CO2(g) +4H2 O(g)
Initially,
PV=nRT
125×V=(a+b)RT .....(i)
After combustion, pressure is due to the total moles of CO2
280×V=(3a+2b)RT .....(ii)
Dividing equation ii by i
280/125 = 3a+2b/a+b
2.24 = 3a+2b/a+b
2.24a + 2.24b =3a+2b
2.24b - 2b = 3a - 2.24a
0.24b = 0.76a
b= 3.2a
mole fraction of C3H8 = a/a + b = a/a + 3.2a = 1/4.2 = 0.24
Which energy transformation occurs when you strike (light) a match?
Answer/Explanation:
Mechanical Energy to Thermal Energy
When you strike a match, it moves through the air until it rubs against a surface. The rubbing produces the heat required to light the match. This is a transformation from mechanical energy to thermal (heat) energy.
Energy transformation which occurs when a matchstick is lighted is that mechanical energy is converted to thermal energy.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.
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Arrange the electrons in the sulfur atom in the orbital diagram
Answer:
So since there are 16 electrons in sulfur and the first layer of electrons in an orbital shell has a max of two, the first layer will be full. The second layer has a max of 8, so that will also be full. The third layer also has a max of 8 but will not get filled up since there are only 6 electrons left. These are the valence electrons. The orbital diagram will usually look like this:
( O = nucleus, . o = electron)
o o
o O o o
o
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Which element has the same number of electrons in the outermost energy level at Lithium?
A. Hydrogen
B. Beryllium
C. Carbon
D. Magnesium
Answer:
Hydrogen is your answer because lithium and hydrogen both have 1 electron in their outermost energy level
Untitled Section
Which of the following is not a physical change? *
10
A. crushing
B. sublimation
C. rotting
D. deposition
Next
Page 29
Answer:
B.
Explanation:
Hope this helps.
How would I find the number of protons, neutrons and electrons when I only have the atomic number and atom (assignment says assume the net charge is 0)
Explanation:
Atomic number , protons and electrons have the same value / their value is same .
But for the neutron there is no specific technique. You have to remember the neutrons of every element
When an atom makes a transition from a higher energy level to a lower one, a photon is released. What is the wavelength of the photon that is emitted from the atom during the transition?
Answer:
Depends on different states.
Explanation:
The wavelength of the photon that is emitted from the atom during the transition depends on the transition from different states. If the photon is emitted from n=4 state to n=3 state, the wavelength of photon is 1875 while on the other hand, if the photon is emitted from n=5 state to n=3 state, the wavelength of photon is 1282. If the photon is emitted from n=3 state to n=2 state, the wavelength of photon is 656.
Strontium compounds are often used in flares because their flame color is bright red. One industrial process to produce low-solubility strontiun) compounds (that are less affected by getting wet) involves the reaction of aqueous solutions of strontium nitrate and sodium carbonate. Write the balanced molecular equation, the total ionic equation and the net ionic equation for this reaction.
Answer:
Sr(NO3)2 + Na2CO3 --------> SrCO3 + 2NaNO3
Total ionic equation;
Sr^2+ + NO3^- + Na^+ + CO3^2- -----> SrCO3 + 2NaNO3
Net ionic equation;
Sr^2+ + CO3^2- -----> SrCO3
Explanation:
The molecular equation shows the reactions of the compounds to give the products. It shows the molecular formula of reactants and products.
The total ionic equation shows the ions that recombine to form the products of the reaction.
The net ionic shows the major ionic reaction that took place in the system.
Hence, the net ionic equation explicitly shows the major species that are involved in a reaction, while a complete ionic equation includes the spectator ions.
Balanced chemical equation:
[tex]Sr(NO_3)_2 + Na_2CO_3 --> SrCO_3 + 2NaNO_3[/tex]
Total ionic equation:
[tex]Sr^{2+} + NO_3^{-} + Na^+ + CO_3^{2-} --> SrCO_3 + 2NaNO_3[/tex]
Net ionic equation:
[tex]Sr^{2+} + CO_3^{2-} --> SrCO_3[/tex]
The balanced molecular equation shows the reactions of the compounds to give the products. It shows the molecular formula of reactants and products. The total ionic equation shows the ions that recombine to form the products of the reaction. The net ionic shows the major ionic reaction that took place in the system.Learn more:
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Genchemium, a hypothetical metal with a atomic mass of 150 g/mol, has a body-centered (bcc) cubic unit cell and a density of 1.93 g/cm3. What is the edge length (in pm) of genchemium
Answer:
edge length a = 636.7 pm
Explanation:
If you check the image below, you would see that there is a technical error that makes it unable to submit the answer, but to curb that effect, I have attached the screenshot of my answer showing how explained it by using the text-editor.
Thanks!
The edge length (in pm) of the hypothetical metal genchemium is;
a = 0.6367 pm
We are given;
Atomic mass; M = 150 g/mol
Density; ρ = 1.96 g/cm³
This is a BCC structure and as such formula to find the edge length is;
ρ = (z × M)/(N × a³)
where;
z = number of atoms available in each unit cell = 2 atoms
M is atomic mass
N is avogadro's number = 6.023 × 10²³ mols
a is edge length
Thus, making a the subject gives;
a = ∛(z × M)/(N × ρ)
Plugging in the relevant values;
a = ∛(2 × 150)/(6.023 × 10²³ × 1.96)
a = 63.67 × 10⁻⁹ cm
converting to meters gives;
a = 0.6367 × 10⁻⁹ m
converting to pm gives;
a = 0.6367 pm
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H E L P I NEED HELPPP!!!! The primary purpose of the experimental method is to *
solve problems.
design experiments.
make observations.
publish theories.
Answer:
The answer is make observations
Explanation:
Observing is the first step of the experimental method.
What types of structures do you see inside of the ovary?
Answer:
medulla and iuter cortext
Explanation:
Answer:
I see an iuter cortext and a medulla
I hope this helps
Make at least 3 observations that compare the Polonium nucleus before and after it decays?
Answer:
Observations
The Polonium nucleus disintegrates to form a stable Lead nucleus with the emission of an alpha particle.The mass number of the original Polonium nucleus decreases by 4 ( ie from 210 to 206)The atomic number of the original Polonium nucleus decreases by 2 (ie from 84 to 82)Explanation:
Polonium (Po) is a radioactive silver-grey material that exists in very low concentrations as a solid in the environment.
As a radioactive substance, it is unstable and then it undergoes radioactive alpha decay to form a stable chemical element - Lead (Pb)
Polonium Nucleus before decay
Polonium (²¹⁰₈₄Po) has a mass number of 210 and an atomic number of 84. The atomic number tells us that Polonium has 84 protons in its nucleus before it undergoes decay.
The mass number tell us that Polomium has 126 neutrons in addition to the 84 protons in its nucleus
The total number of protons and neutrons in a nucleus make up its Mass Number
Polonium Nucleus after decay
Polonium undergoes radioactive decay by emitting an alpha particle, which is also known as a Helium particle (⁴₂He)
²¹⁰ ₈₄Po ⇒ ²⁰⁶ ₈₂Pb + ⁴₂He
Observations
The Polonium nucleus disintegrates to form a stable Lead nucleus with the emission of an alpha particleThe mass number of the original Polonium nucleus reduces by 4 ( ie from 210 to 206)The atomic number of the original Polonium nucleus decreases by 2 (ie from 84 to 82)A new stable element (Lead) is formed.An alpha particle (⁴₂He) is released.Which the following statement ia correct for the equation shown here
What do scientists measure when determining the absolute age of a rock?
Worldwide, scientists are working on different options for clean energy to replace the burning of fossil fuels. One option that could potentially be successful is the use of hydrogen gas. This gas can be generated through a reaction between carbon and water L C(s) 2H20(g) -CO2(g) + 2H2(g) AH = ? 1) CO2(g) C(s) + O2(g) AH = 393.5 KJ 2) 2H2O(g) 2H2(g) + O2(g) AH = 483.6 KJ Based on what you have learned in this lab, use the chemical equation and Hess's law to detecoaine the heat.offormationandis.this.aaction.is.Yothermic.or.andotberoic MG 2291 pg IMG 2290 jpo cocx (8).ddocx ChartGo (2) png 199+ Based on what you have learned in this lab, use the chemical equation and Hess's law to determine the heat of formation and if this reaction is exothermic or endothermic. T' T. 0 Words Check Answer Next ChartGo (2) pr dock (8).docx IMG 2290jpg IMG 2291 jpg
Answer:
H1 + H2 = -393.5 KJ + 483.6 KJ = 90.1 KJ
Explanation:
Equation 1 must be changed to C(s) + O2 (g) --> CO2 (g) H1 = -393.5 KJ
Equation 2 is in the correct order.
2H2O --> 2H2(g) + O2(g) H2 = 483.6 KJ
Adding the two equations together cancels out the oxygen in equation 1 and 2 to give the desired reaction equation.
H1 + H2 = -393.5 KJ + 483.6 KJ = 90.1 KJ
This means the heat of formation for this reaction gives a positive enthalpy, which makes this reaction endothermic.
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 90.1 KJ is the total enthalpy.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Internal energy is the sum of all kinds of energy that the particles of a matter can possess, for example translational energy. Rotational energy.
Equation 1 C(s) + O[tex]_2[/tex] (g) [tex]\rightarrow[/tex]CO[tex]_2[/tex] (g) H₁= -393.5 KJ
Equation 2 2H[tex]_2[/tex]O [tex]\rightarrow[/tex]2H[tex]_2[/tex](g) + O[tex]_2[/tex](g) H₂ = 483.6 KJ
Adding the two equations together cancels out the oxygen in equation 1 and 2 to give the desired reaction equation.
H₁ + H₂ = -393.5 KJ + 483.6 KJ
H = 90.1 KJ
This means the heat of formation for this reaction gives a positive enthalpy, which makes this reaction endothermic.
Therefore, 90.1 KJ is the total enthalpy.
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Match the functions with the corresponding cell structure.
Column A
1.
Cell Membrane:
Cell Membrane
2.
Nucleus:
Nucleus
3.
Cytoplasm:
Cytoplasm
Column B
a. Protect the DNA and genes required for protein synthesis
b. Enclose the components of the cell and Regulate passage of substances through the cell
c. Houses the major organelles such as the mitochondria that are essential for creating energy.
Answer:
1c 2a 3b
Explanation:
Answer:
1.C
2.A
3. B
Explanation:
Which Atom is most likely to form a metallic bond
Answer:
aluminium
Explanation:
Compare and contrast lithium and potassium and also fluorine !!!??? Pls need help
lithium and potassium are both in the alkali family and they are metals. Fluorine is a non-metal and lives in the halogens family. But, each of them have 2 valence electrons in the innermost ring
Give the IUPAC name for the following molecule.
Answer:
The IUPAC name is:
4-methyl pentanoic acid
Explanation:
4-Methylpentanoic acid is actually a carboxylic acid. It has five carbons and there is a methyl substitution which is at the fourth carbon.
Molecular Formula: [tex]C_{6}H_{12}O_{2}[/tex]
The acid is known to be a metabolite of 20 alpha-hydroxyl cholesterol. From the excerpt, the acid is a branched-chain and also known as a saturated fatty acid. It is known to be a conjugate acid of an isocaproate.
Other names for the acid are also called 4-methylvaleric acid or isocaproic acid.
After burning your candle for a few hours you and your friend notice that it's mass has decreased. Your friend claims that the mass "disappeared". Why do you know he is wrong (Hint: it's a Scientific Law)? What actually happened to the mass? What form is that mass in now? What is this process called?
Answer:
The law of conversion of mass is a scientific law that says that mass or matter can not be created or destroyed like energy but changes its form in a different type of state. So, by the law of conversion of mass, you can say that mass is not disappeared but change in different forms of states of matter like gas, soot, or melted residues of candle and ash of thread.
Due to this, the mass of the solid or waxy state due to burning changes to gas released by burning and residue of wax that will be equal to the mass of the original mass.
Testbank, Question 095 What is the expected major organic product from the treatment of 4-methyl-2-pentyne with excess hydrogen in the presence of a platinum catalyst
Answer:
See explanation and image attached
Explanation:
The addition of excess hydrogen to alkyne in the presence of a platinum catalyst leads to complete hydrogenation of the alkyne as shown in the image attached.
Therefore, an alkane is obtained as the major organic product when excess hydrogen reacts with an alkyne in the presence of a platinum catalyst.
Where is most of Earth’s fresh water found?
in the ground
near the poles
in lakes and streams
in the air as water vapor
Answer:
i believe it is in the ground
Answer:
gound
Explanation:
what is the frequency of an electromagnetic wave that has a wavelength of 4.55x10-3m
Answer:
hnjilbglu
Explanation:
nbjl,bhuk
What is the atom of CO2
Answer:
Carbon dioxide is composed of one carbon atom covalently bonded to two oxygen atoms. It is a gas (at standard temperature and pressure) that is exhaled by animals and utilized by plants during photosynthesis. Carbon dioxide, CO2, is a chemical compound composed of two oxygen atoms and one carbon atom
Explanation:
Answer:
Carbon dioxide is composed of one carbon atom covalently bonded to two oxygen atoms. It is a gas (at standard temperature and pressure) that is exhaled by animals and utilized by plants during photosynthesis. Carbon dioxide, CO2, is a chemical compound composed of two oxygen atoms and one carbon atom.
Explanation:
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A student applied a force of 200 N to push a box 15 m down the sidewalk. Given the formula. W = F xd, how much work has
been done?
O 30 J
Answer:
3,000 J
W = f x d
W = 200 x 15
W = 3,000 J
