What is the SHE cell in electrochemistry and how has it simplified the collecting and sharing of potential data for half reactions? What is the role of the inert platinum electrode in the SHE cell? How is the platinum electrode included in the standard notation of the cell? When will the SHE cell act as an anode and when will it act as the cathode? Give very specific examples
Answers
The SHE (Standard Hydrogen Electrode) cell, is a reference electrode used in electrochemistry to measure electrode potentials. The inert platinum electrode in the SHE cell serves as a conductor. The SHE cell will act as the anode when it is connected to a half-cell with a more positive potential and vice-a-versa for cathode.
The SHE cell has simplified the collecting and sharing of potential data for half reactions by providing a standard reference point for measuring electrode potentials. By using the SHE cell as a reference electrode, researchers can compare the potentials of other half-reactions relative to the SHE, allowing for easier comparison and analysis of electrochemical data.
In the standard notation of the SHE cell, the platinum electrode is denoted as Pt(s), with the (s) indicating that the electrode is a solid. The notation for the SHE cell is written as follows:
H2(g) | H+ (aq) || Pt(s) | H2 (g, 1 atm)
In this notation, the vertical bars indicate the phase boundary between the two half-cells, with the double vertical bars indicating a salt bridge or other type of ion-conducting pathway between the two half-cells.
The SHE cell will act as the anode when it is connected to a half-cell with a more positive potential, and it will act as the cathode when it is connected to a half-cell with a more negative potential.
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Related Questions
which of the following is a combustion reaction ? ( please answer asap !! ) <3
Answers
Answer: 3
Explanation:
Explain why an organism dies if the respiratory and circulatory system 'paused' for a while.
Answers
Answer:
Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body
Explanation:
What is the pH of a solution with a pOH of 4.91?
Answers
Explanation:
pH = 14 - pOH
= 14 - 4.91
= 9.09
The following diagram on the left represents the copper nitrate solution in the half‑cell before the galvanic cell starts to operate. In the following diagram on the right, draw a representation of the solution in the same half‑cell after the galvanic cell has been operating for some time and is still producing a voltage.
Before reaction : 4 Cu2+ molecules and 8NO3-
Answers
Answer:
There is too much here for me to attempt in one sitting, but I will get you started and give suggestions that may help you proceed on your own.
a) As far as I can tell, you didn't provide the reduction potentials in the table below. So, I looked them up and find them to be
Cu2+ +2e- ==> Cu(s) Eº = +0.34 V
Zn2+ + 2e- ==> Zn(s) Eº = -0.76 V
Net ionic equation: Cu2+(aq) + Zn(s) ==> Cu(s) + Zn2+(aq)
b) Eºcell = 0.34 V + 0.76 V = 1.10 V
c) ∆Gº = -nFEº where n = number of electrons transferred (2) and F = 96,485 C/mol e- and Eº = 1.1 V
d) Again, there is no diagram
e) same
f) Use the Nernst equation Ecell = Eºcell - 2.303RT/nF log Q where R = 8.314; T = Kelvin; F = Faraday const. and Q = reaction quotient, i.e. products/reactants
g) the cell voltage is an intensive property. That should help you answer this part of the question
Explanation:
its not much but i hoped this helped
which of the following chemical reactions represents an acid-base reaction? a. hbr koh ↔ kbr h2o b. nh4oh kcl ↔ koh nh4cl c. zncl2 mgso4 ↔ znso4 mgcl2 d. h2so4 cacl2 ↔ caso4 hcl
Answers
The chemical reaction that represents an acid-base reaction is:
a. HBr + KOH ↔ KBr + H₂O
In an acid-base reaction, an acid reacts with a base to form a salt and water. In option a, HBr (hydrobromic acid) reacts with KOH (potassium hydroxide) to form KBr (potassium bromide) and H₂O (water). This reaction involves the transfer of a proton (H⁺) from the acid (HBr) to the base (KOH), resulting in the formation of a salt (KBr) and water (H₂O).
In options b, c, and d, the reactions involve the exchange of ions between different compounds, but they do not represent an acid-base reaction. Option b represents a double displacement reaction, options c and d represent precipitation reactions. Only option a represents an acid-base reaction as indicated by the presence of an acid and a base reacting to form a salt and water.
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Purines are salvaged by the addition of _________ to form nucleotide monophosphates.
Answers
Purines are salvaged by the addition of ribose-5-phosphate to form nucleotide monophosphates.
What are purines?Purines are molecules composed of carbon and nitrogen atoms that can be found in both DNA and RNA.Purines are classified into two types in the human body: endogenous purines and exogenous purines. Endogenous purines account for roughly two-thirds of purines in the body. The human body produces these purines, which are found inside its cells.Purine is a heterocyclic aromatic chemical molecule with two rings that are bonded together. It disintegrates in water. The term purine refers to a broader class of compounds that includes substituted purines and related tautomers. The most common heterocycles in nature are those containing nitrogen. Exogenous purines are purines that enter the body through food.To know more about purines refer,
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Hemispheres are north or south of the equator. What season is it in Asia when it is winter here?
Answers
Answer:
Summer
Explanation:
Assuming you are in the northern hemisphere, it would be summer.
Asia is in the southern hemisphere and because of the Earth's axis of 23 degrees, it causes seasons to be inversed in the other hemisphere.
Hope that helps
draw the structural formula for nitrogen, n2, and state the type of bond in a nitrogen molecule.
Answers
The structural formula for nitrogen is \(N_2\). Nitrogen is a diatomic molecule, which means it consists of two atoms of nitrogen that are bonded together.
A covalent bond is a chemical bond that forms when two atoms share electrons to form a stable molecule. In a covalent bond, the atoms share electrons in order to fill their outermost energy levels, which are known as valence shells. In the case of nitrogen, the two atoms of nitrogen each have an incomplete valence shell. The outermost electron of each nitrogen atom is called a valence electron. The valence electrons of nitrogen are not involved in any other chemical bonds, so they are available to form a covalent bond with other atoms.
The chemical formula for nitrogen is N, which indicates that there are two atoms of nitrogen in each molecule. The type of bond in a nitrogen molecule is a covalent bond. A covalent bond is a chemical bond that forms when two atoms share electrons to form a stable molecule. In the case of nitrogen, the two atoms of nitrogen share their outermost electrons to form a covalent bond.
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How much faster will Xenon escape out and opening than carbon dioxide gas?
Answers
gas with the smallest amount of molecular weight will effuse the quickest
ayudenme porfa doy corona xd
Answers
Answer:
e) 5
Explanation:
Because it's H
True or false? Salt water takes a shorter time to boil than regular water.
Send help!!!!
Answers
Answer:
false
salt water does the oppsotie
Explanation:
the beta decay product of mo-98 is (hint mo is atomic number 42) group of answer choices nb-97 tc 96 nb - 98 tc - 98
Answers
The beta decay product of Mo-98 (Molybdenum-98, atomic number 42) is Tc-98 (Technetium-98).
Here's a step-by-step explanation:
1. Mo-98 undergoes beta decay, where a neutron is converted into a proton and an electron (beta particle) is emitted.
2. As a result, the atomic number increases by 1 (from 42 to 43) and the element changes from Mo (Molybdenum) to Tc (Technetium).
3. The mass number remains the same (98), so the final product is Tc-98 (Technetium-98).
So, the correct choice among the given options is Tc-98.
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In a thorium decay series, thorium-232 loses a total of 6 alpha particles and 4 Beta particles in a 10-stage process. What is the final isotope produced?
Answers
The final isotope produced in the thorium decay series after losing 6 alpha particles and 4 beta particles in a 10-stage process is lead-208. This is because thorium-232 undergoes a series of alpha and beta decay, ultimately resulting in the stable isotope lead-208.
To find the final isotope produced, we need to track the changes in atomic mass and atomic number due to the loss of alpha and beta particles.
1. Alpha particles consist of 2 protons and 2 neutrons, so their loss will result in a decrease of 4 atomic mass units (AMU) and 2 atomic number units.
2. Beta particles are electrons emitted during the decay process, which leads to an increase of 1 atomic number unit without changing the atomic mass.
Now, let's apply these changes to thorium-232:
Initial isotope: Thorium-232 (atomic number 90, atomic mass 232)
Loss of 6 alpha particles:
- Decrease in atomic number: 90 - (6 * 2) = 78
- Decrease in atomic mass: 232 - (6 * 4) = 208
Loss of 4 beta particles:
- Increase in atomic number: 78 + (4 * 1) = 82
Final isotope: Atomic number 82 and atomic mass 208
The element with atomic number 82 is lead (Pb), so the final isotope produced is lead-208 (Pb-208).
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what element is this bohr model showing?
Answers
Answer:
Magnesium (Mg)
Explanation:
The amount of electrons displayed on this model is 12. Assuming that this is a neutral atom, the amount of electrons is equal to the atomic number of a given element. Therefore, 12 electrons correspond to the twelfth element on the Periodic Table, Magnesium.
Hope this is helpful!! :)))
Identify the most and the least basic compound in each of the following sets. Leave the remaining answer in each set blank.a) Sodium acetate: --B Sodium methoxide: Sodium phenoxide: b) Sodium acetate: Sodium chloroacetate: Sodium fluoroacetate: c) Lithium ethoxide: Lithium hydroxide: Lithium formate:
Answers
Least to most basic compounds;
a) Sodium acetate: LEAST basic; Sodium methoxide: MOST basic; Sodium phenoxide: blank
b) Sodium acetate: LEAST basic; Sodium chloroacetate: blank; Sodium fluoroacetate: MOST basic
c) Lithium ethoxide: LEAST basic; Lithium hydroxide: MOST basic; Lithium formate: blank
Sodium compounds are compounds containing the element sodium. Sodium is a group 1 alkali metal, which has a single electron in its outer shell and, as such, is highly reactive.
Sodium compounds tend to be strong bases and are very soluble in water. Sodium acetate is a compound formed from the combination of acetic acid and sodium.
It has a very high solubility in water and is used in many industrial and food processing applications. Sodium methoxide is the combination of methanol and sodium and is an even stronger base than sodium acetate.
It is also soluble in water, and is used as a catalyst in many chemical reactions.
Sodium phenoxide is a combination of phenol and sodium, and is an even stronger base than sodium methoxide. It is highly water soluble and is used in pharmaceuticals.
Lithium compounds are compounds containing the element lithium. Lithium is a group 1 alkali metal, similar to sodium. It is much less reactive than sodium, however, and lithium compounds tend to be weaker bases.
Lithium ethoxide is the combination of ethanol and lithium and is a relatively weak base. It is water soluble and is used in pharmaceuticals. Lithium hydroxide is the combination of lithium and water and is a strong base.
It is also water soluble and is used as a pH adjuster. Lithium formate is the combination of lithium and formic acid and is an even weaker base than lithium ethoxide. It is also water soluble and is used as a food preservative.
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Please help me answer these true or false chemistry questions!! 33 points!!
1) Galium's (Ga) electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1 = TRUE OR FALSE
2) Galium has two valence electrons = TRUE OR FALSE
3) Iridium electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d7 = TRUE OR FALSE
4) Iridium (Ir) has two valence electrons = TRUE OR FALSE
5) Oxygen's orbital notation is 1sX 2sX 2pX// = TRUE OR FALSE
6) Scandium's (Sc) orbital notation is 1s2 2s2 = TRUE OR FALSE
7) Carbon (C) noble gas abbreviation is [Rn] 7s2 = TRUE OR FALSE
8) Neon's (Ne) noble gas abbreviation is [Xe] 6s2 4f6 = TRUE OR FALSE
9) Lithium's noble gas abbreviation is [He] 2s1 = TRUE OR FALSE
10) The long form electron configuration of Iodine ion with a -1 charge (I^-1) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 = TRUE OR FALSE
11) Iodine ion with -1 charge is isoelectronic with Neon = TRUE OR FALSE
12) Calcium ion with +2 charge's (Ca^+2) electron configuration is 1s2 2s2 2p6 3s2 3p6 = TRUE OR FALSE
13) Calcium ion with +2 charge is isoelectronic with Argon (Ar) = TRUE OR FALSE
14) Helium's Electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 = TRUE OR FALSE
15) Helium is isoelectronic with Xenon (Xe) = TRUE OR FALSE
16) The neutral 1s2 2s2 2p6 3s2 3p5 atom is Cl = TRUE OR FALSE
17) The atom with the -1 charge and the electron configuration 1s2 2s2 2p6 3s2 3p6 is Cl-1 = TRUE OR FALSE
18) The atom with the -3 charge and the electron configuration of 1s2 2s2 2p6 3s2 3p6 is P^-3 = TRUE OR FALSE
19) The quantum number for Chlorine ion with -1 charge is (3, 1, +1, -1/2) = TRUE OR FALSE
Thanks to anyone that answers!!
Answers
Answer: 1) True
2) False 4)False 5)True
Explanation: I took a test that had similar questions
Mercury (hg) is present in trace amounts in coal, ranging from 50.0 to 200.0 ppb. a typical power plant burns 2.39 million tons of coal
per year. calculate tons of mercury in the coal based on the lower (50.0 ppb) and higher (200.0 ppb) concentrations.
mercury at 50.0 ppb= __ tons hg
mercury at 200.0 ppb= __ tons hg
Answers
The amount of mercury at 200.0 ppb is 0.478 tons of mercury.
The amount of mercury at 50.0 ppb is 0.1195 tons of mercury.
The question states that mercury is present in trace amounts in coal, ranging from 50.0 to 200.0 ppb.
A typical power plant burns 2.39 million tons of coal per year.To calculate the amount of mercury at 50.0 ppb, we first need to convert ppb (parts per billion) to tons. We can do this by multiplying the concentration by the total amount of coal burned:50.0 ppb x 2.39 million tons = 0.1195 tons of mercury.
Therefore, the amount of mercury at 50.0 ppb is 0.1195 tons of mercury.To calculate the amount of mercury at 200.0 ppb, we can use the same formula:
200.0 ppb x 2.39 million tons = 0.478 tons of mercury.
Therefore, Overall, to calculate the amount of mercury in coal based on different concentrations, we can use the formula concentration x total amount of coal burned.
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if you use too much hot solvent when dissolving your crude compound, how will that impact the recovery of your compound and why?
Answers
Recrystalization will occur.The solution may become too diluted for crystals to form if you add too much solvent. Impurities will be captured by a hastily formed crystal's lattice. The crystals that result will also be smaller.
What is Recrystalization?Recrystallization is a physical process used to separate compounds based on how soluble they are. Heating the material to dissolve the compound with impurities in a mixture of a suitable solvent completes the procedure. We can remove the desired chemical or contaminants from the mixture using this method.
The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. The resulting crystals will also be smaller.
This method is used to harden steel in order to eliminate all strain hardening side effects, including the significant plastic deformation brought on by cold working.The crystals that frequently form when the compound precipitates out gave it its name. The natural expansion of larger ice crystals at the expense of smaller ones is another definition of recrystallization.Some commonly effective mixes include diethyl ether-methanol (or ethanol) for polar molecules (particularly esters, alcohols, and hydrocarbons) and diethyl ether-petroleum ether (or benzene) for strongly linked solids (notably amides, alcohols), as well as many natural products.The three main types of recrystallization are;
Single-solvent recrystallization.Multi-solvent recrystallization.Hot filtration-recrystallization.To know more about Recrystalization, refer to:
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Substances with a high polarity have a(low/high) surface tension ?
Answers
Answer:
I think they have high, because the nonpolar molecules usually have a much lower surface tension than polar ones.
In chemical communication between cells, a ________ cell secretes a chemical messenger that binds to ________ on the ________ cell.
Answers
In chemical communication between cells, a secretory cell secretes a chemical messenger that binds to receptors on the target cell.
Cells are the basic building blocks of all living things. The human body is made up of trillions of cells. They give structure to the body, absorb nutrients from food, convert those nutrients into energy, and perform specific functions. In multicellular organisms, such as higher plants and animals, specialized cell groups are organized into tissues and organs.
Cells can be used as the basis for describing organisms as unicellular or multicellular. Unicellular organisms are organisms that have only one cell, i.e. single-celled organisms. Prokaryotes and protists are examples. Multicellular organisms are organisms with more than one cell. Examples are plants and animals.
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Round to 3 significant figures.
1.235
Answers
Answer:
1.24
Explanation:
According to the concept of significant figures, rounding off to 3 significant figures gives 1.24.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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name two enzyme used to make alcohol
Answers
...
Fermentation Improvement.
Palkolase HT Heat-stable alpha amylase for starch liquefaction
Palkodex Glucoamylase for starch saccharification
Answer:
here is your answer
Cellulase and proteases are two enzymes are used for making alcohol
hope it helps you
Explanation:
pwlss giv meh brainless
100 POINTS WILL MARK BRAINLIEST PICTURE BELOW
Answers
Answer:
D
Explanation:
it seems the most logical
Answer:
B
Explanation:
6.00 ml
PLEASE MARK AS BRAINLIEST
3. Atoms of elements in a gipup on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms
A) number of principal energy levels (shells)
B) number of valence electrons
C) atomic numbers
D) atomic masses
Answers
The same number of valence electrons
the standard enthalpy of fusion of 1.0 mole of a compound is 10 kj at its melting point of 200 k. what is the entropy change for the melting 2.0 mole of this compound at its melting point?
Answers
1. The standard enthalpy of fusion of 2.0 moles of the compound is 20 kJ.
2. The entropy change for the melting of 2.0 moles of the compound at its melting point is 2 times the entropy change for the melting of 1.0 mole.
1. The standard enthalpy of fusion is a measure of the heat energy required to convert one mole of a substance from solid to liquid at its melting point.
Given that the standard enthalpy of fusion of 1.0 mole of the compound is 10 kJ, we can conclude that the standard enthalpy of fusion of 2.0 moles of the compound would be double that value, which is 20 kJ.
2. The entropy change (ΔS) for the melting of a substance is related to the standard enthalpy of fusion (ΔH) by the equation ΔS = ΔH/T, where T is the temperature in Kelvin. In this case, the temperature is given as the melting point, which is 200 K.
Since the entropy change is directly proportional to the number of moles, we can conclude that the entropy change for the melting of 2.0 moles of the compound at its melting point would be twice the entropy change for the melting of 1.0 mole.
Therefore, the entropy change for the melting of 2.0 moles of the compound would be 2 times ΔS.
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Pan of water sitting outside during a hot sunny day. The temperature of the water goes up. What type of heat transfer causes the temperature to go up?
Answers
Answer: Convection
Explanation:
I hope this helps :D
Answer:
Radiation
Explanation:
It said that was the answer on the test.
A pan of water is sitting outside during a hot sunny day. The temperature of the water goes up. What type of heat transfer caused the temperature to go up?
conduction
induction
Incorrect: convection
Correct: radiation
Matching: Which is involved in making energy for the cell?
A. cell membrane
B. nucleus
C. endoplasmic reticulum
D. mitochondria
E. cell wall
F. ribosomes
A.
B.
C.
D.
E.
F.
Answers
Answer:
D. Mitochondria
Explanation:
This is the one that makes the energy that powers the cell, aka, the powerhouse.
what is convection,radiation,conduction?
Answers
Answer:
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.
classify the following energy sources as renewable and non-renewable energy sources (natural gas cool biomass and geothermal energy)
Answers
Answer:
bio mass is renewable
natural gas non renewable geothermal energy renewable
Explanation:
biomass is by palnts and animals geothermals is unlimeted because its made out of the earths core
How many joules are needed to change the temperature of 40 g of water from 33 0C to 23 0C?