Answer:
In chemistry, the element configuration of an atom refers to the arrangement of its electrons in its outermost energy level, or valence shell. The element configuration is typically written using the symbols of the elements in the periodic table, and it is used to predict the chemical behavior of the atom.
One common way to write element configurations is in terms of noble gas configurations. A noble gas is a chemical element that is unreactive and stable due to its filled valence shell, and the noble gases are helium, neon, argon, krypton, xenon, and radon.
The reason why element configurations are often written in terms of noble gas configurations is that it makes it easier to predict the chemical behavior of the atom. For example, the element configuration of sodium is 1s22s22p63s1. This can be written in terms of the noble gas configuration of neon, which is 1s22s22p6, as [Ne]3s1. This notation indicates that the valence shell of sodium has the same electron configuration as the noble gas neon, plus one additional electron in the 3s subshell.
Similarly, the element configuration of chlorine is 1s22s22p63s23p5. This can be written in terms of the noble gas configuration of argon, which is 1s22s22p6, as [Ar]3d5. This notation indicates that the valence shell of chlorine has the same electron configuration as the noble gas argon, plus five additional electrons in the 3p and 3d subshells.
Therefore, element configurations are written in terms of noble gas configurations to provide a concise and easy-to-understand representation of the electron arrangements in the valence shells of atoms. This can help predict the chemical behavior of the atoms and aid in the understanding of the properties of chemical compounds.
if the hypothalamus was not stimulated by estrogen, which pathways would be interrupted? check all that apply.
If the hypothalamus were not stimulated by estrogen, the pathways that would be disrupted would be:
Release of gonadotropin-releasing hormone from the hypothalamus.Release of luteinizing hormone from the anterior pituitary.Correct answer: letters B and D.
Because, without estrogen stimulation, the hypothalamus would be unable to send a signal to the anterior pituitary to release luteinizing hormone. Luteinizing hormone is necessary for the production of other hormones such as estrogen, so without it the other hormones would not be released.
The Importance of Estrogen Stimulation on Hormone ProductionThe hormone estrogen is essential to the production of other hormones and maintaining overall health in both men and women. Estrogen is produced in the ovaries of women and testicles of men, and it is responsible for the development of:
Sexual characteristicsRegulating the menstrual cycleMaintaining pregnancyEstrogen also plays a crucial role in stimulating the hypothalamus, which is responsible for releasing gonadotropin-releasing hormone and luteinizing hormone from the anterior pituitary. This hormone is responsible for triggering the production of other hormones, such as testosterone.
If the hypothalamus was not stimulated by estrogen, which pathways would be interrupted? check all that apply:
A) Release of gonadotropin-releasing hormone from the anterior pituitary
B) Release of gonadotropin-releasing hormone from the hypothalamus
C) Release of luteinizing hormone from the hypothalamus
D) Release of luteinizing hormone from the anterior pituitary
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g which materials have a strength in compression that is significantly different than their strength in torsion
Brittle substances are widely recognized to be a good deal more potent in compression than in tension.
A ductile fabric are approximately equal strong in tension and compression however weak in shear. Torque on a shaft reasons shear pressure. The torsion, or twist, brought on when torque is carried out to a shaft reasons a distribution of strain over the shaft's cross-sectional vicinity. observe that this is exceptional from tensile and compressive masses, which produce a uniform stress over the item's pass-section.
This is a end result of the microscopic structure of rock it contains microscopic cracks which might be compelled open and enlarged via tension and shear but that are forced closed with the aid of compression.
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Would greatly appreciate the help
9.0 mol Na2S reacts with 8.0 mol
CuSO4 according to the equation below:
Na2S + CuSO4
→
Na2SO4 + CuS
Considering only the 8.0 mol CuSO4,
how many moles of CuS form?
? mol CuS
Round your answer to the tenths place.
Answer:
the first answer was correct on the second part of the question
Explanation:
i got it correct in accellus
For every molecule of O2 that is released by photosystem II, _________ H2O molecules are needed, which together pass _________ electrons to the PS II reaction-center complex.
As a result, four electrons are given to the PS II reaction-center complex for every molecule of O2 produced by PS II, and two molecules of water are required in its place.
For photosystem II, what is required?One of the protein complexes is the photosynthesis component known as Photosystem II. Numerous research have centered on it as a significant biological energy source for life on earth. For the entire photosynthesis to take place, this process needs water to obtain the electrons.
What chemical supplies photosystem 2 with electrons?The initial step in the photosynthesis process is photosystem II. By catching photons, it can use the energy to pull electrons out of water molecules.
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a mixture of 0.220 moles co, 0.350 moles h2 and 0.640 moles he has a total pressure of 2.95 atm. what is the pressure of co? a) 1.86 atm b) 0.649 atm c) 0.536 atm d) 1.54 atm e) 0.955 atm
The pressure of co is 0.536 atm. So, the correct option is (C)
Mole fraction of a gas = the Number of moles of gas / Total moles of gas
For CO :
Mole fraction of CO = 0.220/( 0.220 + 0.350 + 0.640)
= 0.1818
the pressure of a gas = Mole fraction×Total pressure
For CO :
pressure of CO = 0.1818 ×2.95 atm ≈ 0.536 atm
Hence, the pressure of co is 0.536 atm.
The ratio of the partial pressure of a given gas to the overall pressure exerted by the gaseous mixture is the mole fraction of that gas in a mixture of gases. When the entire number of moles in the mixture is known, this mole fraction can also be used to determine the total number of moles of a constituent gas.
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Place the best reagent in the bin for each of the following reactions involving cyclohexylmethanol. SOCl2 PBr3 CH3l H2SO4 PCCNaCI HBr mCPBA NaH CrO3, H3O+ HCI NaBr
The best reagent in the bin for each of these reactions involving cyclohexylmethanol to cyclohexyl methyl bromide is NaBr.
The reagent used in the reaction of the cyclohexylmethanol to cyclohexyl methyl bromide is NaBr. the reaction is given as follows :
cyclohexylmethanol + NaBr ------> cyclohexyl methyl bromide
The reagent is used in the chemical reaction in order to find out the the another substances if it is present. A reagent is a substance is used to perform the laboratory test. the reagent is used to perform the above reaction is NaBr.
Therefore, NaBr is the reagent used in cyclohexylmethanol to cyclohexyl methyl bromide.
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Which of the elements below has the lewis dot structure shown below?
Answer:
Cl
Explanation:
a Lewis dot structure shows the number of valence electrons an element has Chlorine (Cl) has 7 valence electrons
Which of the following is a correct chemical equation for the incomplete combustion of C2H6?
A: C2H6 + 2O2 --> 2CO2 + 3H2
B: 2C2H6 + 7O2 --> 4CO2 + 6H2O
C: 2C2H6 + 5O2 --> 4CO + 6H2O
D: C2H6 --> 2C + 3H2
Considering the definition of incomplete combustion, the correct answer is option C: the correct chemical equation for the incomplete combustion of C₂H₆ is:
2 C₂H₆ + 5 O₂ → 4 CO + 6 H₂O
Definition of combustionCombustion is a chemical process through which heat is obtained. To achieve this, oxidation reactions are generated that allow the objective to be reached. To carry out the process, it is necessary to have several elements:
the fuel, which is the substance that is oxidized, can be in a solid, liquid or gaseous state and is made up mostly of carbon and hydrogen.the oxidizer, which is the substance that oxidizes the fuel, and is generally the oxygen found in the air.the activation energy, which is responsible for triggering the reaction.Incomplete combustionIncomplete combustions are those reactions in which compounds that have not been completely oxidized (also called unburned) appear in the combustion gases. Carbon monoxide (CO), a highly toxic gas, and unburned carbon (soot) are usually formed.
Correct chemical equationIn this case, considering the definition of incomplete combustion, the correct chemical equation for the incomplete combustion of C₂H₆ is:
2 C₂H₆ + 5 O₂ → 4 CO + 6 H₂O
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what is the ph of a 0. 40 m h2se solution that has the stepwise dissociation constants? (enter letter of multiple choice) ka1
The pH of a 0.40 m h2se solution that has the stepwise dissociation constants is 2.15.
First, we can neglect the Ka2 value and use Ka1:
so,
Ka1 = [H+][HSe-] / [H2Se]
so by substitution:
1.3 x 1/10⁴ = X*X / (0.4 -X) by solving for X
∴X = 0.00715
∴[H+] = 0.00715
∴pH = -㏒[H+]
= -㏒ 0.00715
= 2.15
What is pH?
pH is a measure of the acidity/base of water. The range is 0 to 14, with 7 being neutral. A pH below 7 indicates acidity, while a pH above 7 indicates basicity. pH is essentially a measure of the relative amount of free hydrogen and hydroxyl ions in water. Water containing more free hydrogen ions is acidic, while water containing more free hydroxyl ions is basic.To know more about pH, click the link given below:
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how many ml of a 4% solution must be added to 500 ml of iv solution to achieve a solution concentration of 4 mg/ml?
Hence we have to add 20 ml of 4% solute in order to obtain a solution concentration of 4 mg/ml.
4 percent solution means 4 parts of solute are dissolved in 100 parts of solvent.
Therefore 4mg / 100ml = x mg / 500 ml
X= 4 * 500 / 100
X = 20
Concentration is a totally commonplace idea utilized in chemistry and associated fields. It's far the degree of the way an awful lot of a given substance there may be combined with some other substance.
The concentration of an answer is the degree of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a fantastically large amount of dissolved solute.
In chemistry, concentration refers to the quantity of a substance in a defined space. Any other definition is that attention is the ratio of solute in a solution to either solvent or overall answer.
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Calculate the number of molecules in 12.5 mol of CaCO3
The number of molecules in 12.5 moles of CaCO₃ is 7.525×10²⁴ molecules
How do I determine the number of molecules?From Avogadro's hypothesis, we understood that
1 mole of CaCO₃ = 6.02×10²³ molecules
Using the above information, we can obtain the number of molecules in 12.5 moles of CaCO₃ as illustrated below:
From Avogadro's hypothesis,
1 mole of CaCO₃ = 6.02×10²³ molecules
Therefore,
12.5 moles of CaCO₃ = (12.5 moles × 6.02×10²³ molecules) / 1 mole
12.5 moles of CaCO₃ = 7.525×10²⁴ molecules
Thus, we can conclude from the calculation made above that the number of molecules is 7.525×10²⁴ molecules
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Which statement is most supportive of the claim that genetic diversity is an advantage of sexual reproduction?(1 point)
Responses
Asexual reproduction results in the same genes being copied, which means the same vulnerabilities in the population.
Lack of genetic diversity from asexual reproduction results in a diminished ability to survive changes to the environment.
Genetic variation from sexual reproduction ensures that at least some individuals will have advantageous traits that help them survive.
Sexual reproduction creates genetic diversity, which results in a wide range of appearances in a population.
Genetic diversity is produced by sexual reproduction, which gives a population a variety of appearances. The following paragraph contains the necessary information regarding genetic diversity.
What makes genetic variety crucial?It is possible for organisms to adapt to changing environmental conditions and prevent inbreeding by maintaining significant genetic variety. When there are limited, isolated populations, inbreeding takes place, which might make a species less able to endure and procreate.
What exemplifies genetic variety the best?Genetic diversity is the range of different hereditary traits within a species. There would be several people with a wide range of diverse traits in such a species with significant genetic diversity. For a community to adapt to shifting surroundings, genetic variety is essential.
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This picture shows the trophic levels in a forest biome. Which of the following best describes how the chemical energy travels up the food pyramid?
The only producers of chemical energy are plants and all other organisms uses this energy and energy decreases as it moves up the food pyramid.
What is food pyramid?Food pyramid interrelate different level of organisms in the biosphere where, one is consumed by the organism of higher level. The primary level in the food chain are plants.
Plants are the only source of energy. Consumption of plants transfers this energy from plants to the next level. And the energy from from the first level consumers transfers to the next level and so on. The energy transferring is only 10% in each level.
Therefore, more energy is lost to the surrounding and the energy transferred to higher level is very low. Thus, option b best describes the fate of chemical energy in food pyramid.
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A solute is dissolved in a liquid. how does the osmotic pressure of the solution compare to the osmotic pressure of the pure liquid?
The osmotic pressure of the pure liquid is more as company to the osmotic pressure of the solution.
A strain large than the osmotic strain is implemented to the answer side , the natural solvent flows out of the answer thru semi - permeable membrane and this phenomenon is known as as opposite osmosis.
Since attention of solute is extra in an answer than in natural water, water from natural water attempts to diffuse or go through osmosis to the answer. Hence, the strain required to save you water access to the solution, i.e. osmotic strain of an answer is constantly better than that of natural water or solvent. As increasingly solute is dissolved withinside the solvent, the attention of the answer is going on increasing.
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Which is NOT a postulate of the kinetic-molecular theory of matter? (Read carefully!)
A. These particles are in constant motion, which is rapid and random.
B. Particles of a solid have little or no interaction; particles of a liquid have greater
interaction; particles of a gas have greatest interaction.
C. All matter is made up of tiny particles called atoms, ions, or molecules.
D. Energy is transferred between particles when they collide, but the collisions are
elastic with no net loss of energy.
Answer:
B. Particles of a solid have little or no interaction; particles of a liquid have greater interaction; particles of a gas have greatest interaction.
a mixture of two gases with a total pressure of 5.00 atm contains 0.30 atm of gas a. what is the partial pressure of gas b?
The partial pressure of gas B is 4.7atm.
Total pressure of both gasses= 5atm
Partial pressure of gas A= 0.3atm
Hence, partial pressure of gas B:
= Total pressure - Partial pressure of gas A
=5 - 0.3
= 4.7 atm
What is pressure?
Since the stress is dependent on the region over which the force is acting, the pressure may be multiplied and reduced with none change within the pressure. The pressure is implemented to be steady if the surface becomes smaller the pressure increases and vice versa.for example, a brick sitting on a surface exerts a force equal to its weight on the object it is resting on. Now we know that a square brick has a wide surface and a skinny surface on the edges. through converting the orientation of the brick resting on a floor, we are effectively converting the stress acting at the floor via the identical brick.To know more about pressure, click the link given below:
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during a chemistry lab exploring chemical reactions, students placed a 30g antacid tablet in a zip-lock bag. then they added 50 grams of water and quickly sealed the bag. the tablet began to fizz and soon disappeared. the bag was filled with gas. how much gas was produced if the mass of the liquid after the reaction is completed is still 50 grams? question 3 options: 30 grams 80 grams 50 grams 90 grams
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore, the mass of the gas after the reaction is completed is 30g.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
mass of antacid tablet+ mass of water =mass of solution
30g+50 g=80g
mass of solution = mass of liquid +mass of gas
80g=50g+mass of gas
mass of gas=30g
Therefore, the mass of the gas after the reaction is completed is 30g.
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What is a Category 4 hazard?
Flammable Solids are easily flammable or may spark a fire by friction. These consist of:
Flammable solidsSelf-reactive compoundsSolid desensitized explosivesSolid materials that provide a significant fire hazard in unmanaged environments. The danger category is organized into three major groups.
The following are subsets of class 4:
Unpromptedly During transportation, combustible materials (also known as compounds subject to spontaneous combustion) are susceptible to spontaneous heat creation, which may lead to a fire. These consist of:
Pyrophoric compounds
Self-heating materials
Water Substances that are reactive (also known as harmful when wet) produce an ignitable gas when in contact with water.
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if the initial rate of appearance of xef4 is 2.50 x 10^-2 atm/min what is the rate of disappearance of xe
2.50×10-² atm/min is the rate of disappearance of xenon(xe), if the initial rate of appearance of xef4 is 2.50 x 10^-2 atm/min
xe+ 2F2⇒ xef4
rate of disappearance of xe= 1( rate of disapperance of xe)= 1( initial rate of appearance of xef4)
⇒1x= 2.50×10-² atm/min
⇒rate of disappearance of xe= 2.50×10-² atm/min
To do this, the lone pairs are arranged in an octahedral arrangement 180 degrees apart from one another in a perpendicular plane. The molecular geometry of XeF4 is hence square planar.
The molecule XeF4 has a tetrahedral form with one side being a lone pair, an unbalanced charge, and dipole dipole interaction between molecules.
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Arrange the organic compounds from most soluble in water to least soluble in water.a. CH4 b. CH3OH c. CH3OCH3
The solubility of organic compounds in water can vary widely. Here is the order of solubility of the compounds you listed, from most to least soluble:
CH3OH (methanol) is highly soluble in water.CH3OCH3 (dimethyl ether) is moderately soluble in water.CH4 (methane) is not very soluble in water.The solubility of a compound in water can depend on a variety of factors, such as the chemical structure of the compound, temperature, and the presence of other substances. Solubility is the ability of a substance, known as the solute, to dissolve in a solvent to form a homogeneous solution. The solubility of a compound is usually expressed in terms of the maximum amount of the compound that can dissolve in a given amount of solvent at a particular temperature.
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a concentration cell is set up using two zinc wires and two solution, one containing 0.050 m zncl2 solution and the other containing 1.00 m zn(no3)2 solution. compute the potential of this cell.
The potential of this cell is +0.0385.
Zn | Zn2+(0.050 M) || Zn2+(1.00 M) | Zn
Zn(s) ==> Zn2+(0.050 M) (oxidation on the left side)
Zn2+(1.00M) + 2e- ==> Zn(s) (reduction on the right side)
Zn2+(1.00M) ==> Zn2+(0.050M)
Ecell = Eºcell - RT ln Q and assuming this situation is at 25ºC (298K), we have...
Ecell = Eºcell - 0.0592 / 2 log Q
Q = 0.050 / 1.00 = 0.05
Ecell = 0 - 0.0296 * log 0.05
Ecell = -0.0296 * -1.301
Ecell = +0.0385 (note the potential is positive, meaning the reaction is spontaneous)
Also note that this is the INSTANTANEOUS cell potential. As time goes on, the cell potential will become ZERO.
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which step of the mixing process do both the biscuit and muffin methods have in common?
One of the steps that both the biscuit and muffin methods have in common is the process of creaming the butter and sugar together.
In both of these methods, the first step is to combine the butter and sugar in a mixing bowl and beat them together until they are light and fluffy. This helps to incorporate air into the mixture, which will create a light, tender texture in the finished product. Another step that both the biscuit and muffin methods have in common is the process of adding the dry ingredients to the wet ingredients. In both methods, the dry ingredients (such as flour, baking powder, and salt) are mixed together in a separate bowl and then added to the wet ingredients (such as eggs and milk). This is typically done in two or three additions, alternating between dry and wet ingredients, and is done to prevent the dry ingredients from forming lumps in the mixture. Overall, the biscuit and muffin methods share several steps in common, including the process of creaming the butter and sugar together and the process of adding the dry ingredients to the wet ingredients. These steps are important for creating the desired texture and structure in the finished product.
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sort the molecules in the glycolysis pathway based on whether they are intermediates or products in the first half of the pathway that requires energy, or are intermediates in the second half of the pathway that produces energy.a. glucose-6-phosphate b. fructose-6-phosphate c. fructose-1,6-bisphosphate d. glyceraldehyde-3-phosphate e. dihydroxyacetone phosphate f. 1,3-bisphosphoglycerate g. 3-phosphoglycerate h. 2-phosphoglycerate i. phosphoenolpyruvate 1. Intermediate in the first half of the pathway 2. Intermediate in the second half of the pathway
Since there are six intermediates in the second half of the route that generates energy so glucose six phosphate is the answer that best fits the facts. Hence, option A is correct.
What is the definition of first intermediate molecule created during glycolysis?
In a continuous series of processes that each require two ATP, glucose is first compound that is transformed into fructose-1,6-bisphosphate. Later, unstable fructose-1,6-bisphosphate breaks into half, resulting in the formation of the three-carbon molecules DHAP and glyceraldehyde-3-phosphate.
Basically, one glucose molecule is converted into two pyruvate (pyruvic acid) molecules, four ATP molecules, and two NADH molecules during the process of glycolysis. The three primary products of glycolysis are ATP, produced via substrate-level phosphorylation, NADH, produced by REDOX processes, and pyruvate molecules.
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what element is probably most
like oxygen and why
1) a 50.00 ml portion of hcl solution requires 29.71 ml of 0.01963 m ba(oh)2 to reach an end point with bromocresol green indicator. calculate the molar concentration of the hcl.
The molar concentration of HCL is 0.02333 M.
What is molar concentration?
The best approach to describe a solute concentration in a solution is in terms of molar concentration. Molarity is defined as the total number of moles of solute dissolved in one liter of solution, or M = mol/L.
What is mole?
A "mole" is the volume of a system with as many elementary particles as there are atoms in 0.012 kilos of carbon 12.
Volume of HCl solution : 50.00 mL = 0.050 L
molarity of Ba(OH)2 == 0.01963 M
reaction : Ba(OH)2 (aq) + 2 HCl(aq) ===> BaCl2 (aq) + 2 H2O (l)
moles of Ba(OH)2 consumed == 0.01963 mol/L * 0.02971 L = 0.0005832 moles
1 mole of Ba(OH)2 reacts 2 moles of HCl ====> thus moles of HCl present : 0.0011664 moles
Molarity HCl == 0.0011664 moles/0.050 L = 0.02333 M
Therefore, the molar concentration of HCL is 0.02333 M.
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give the nuclear symbol, including superscript and subscript, for each type of radiation.
alpha particle: He beta particle: gamma ray: Y Which type of radiation has a negative charge? a. alpha b. beta
c. gamma Which type of natural radiation is pure energy? a. gamma b. alpha
c. beta
Which type of natural radiation has the most massive particles? a. beta b. alpha c. gamma
The subscript in alpha radiation stands for the charge on the nucleus (i.e., the quantity of protons or atomic number, also known as the Z number), and the superscript is the mass number.
In beta radiation, the particle's charge is indicated by the subscript -1, and its almost completely absent mass is indicated by the superscript 0. (no protons or neutrons). The radioactive thorium-234 nucleus is another illustration.
Alpha, beta, and gamma are what?While alpha and beta particles have positive and negative charges, respectively, gamma rays are neutral. An alpha particle is created when two protons and two neutrons come together. Beta particles are high-energy electrons. Photons, which are electromagnetic energy waves, are gamma rays.
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if sodium perchlorate has the formula, naclo4, what formula would you expect for cesium perchlorate?
which statement accurately describes a type of potential energy found in a container full of a chemical substance in liquid form? (1 point)
The statement that accurately describes a type of potential energy found in a container full of a chemical substance in liquid form is the bonds between atoms are one place where potential energy is stored.
What is Energy?
On earth, energy comes in a variety of ways. The elemental source of energy on earth is said to be the sun. Energy is seen as a quantifiable characteristic in physics that may be transferred from an item to carry out work. Thus, we might characterise energy as the capacity to engage in any form of physical action. So, to put it simply, we may define energy as:
Energy is the capacity to carry out task.
The energy that is stored in chemical bonds (between two atoms) is a form of potential energy.
The vibrations of the atoms are because of the thermal energy.
The rotation of the particles shows rotational kinetic energy.
The speed of the particles represents the translational kinetic energy of these particles.
A molecule can have all the forms of energy together. The sum of these shows the total energy stored in a molecule.
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Methanol is converted by the liver to arsenic and can destroy the body over time.
The Conclusion, methanol poisoning can purpose histological adjustments in liver tissues.
Most importantly in instances with imply blood and vitreous humor methanol stages extra than 127 ± 38.nine mg/dL a couple of pathologic capabilities have been detected. Methanol is transformed to formaldehyde thru alcohol dehydrogenase and formaldehyde is transformed to formic acid (formate) thru aldehyde dehydrogenase.
The methanol is transformed through the liver to arsenic and may wreck the frame over time. This is real because it become discovered withinside the liver of the hen. Methanol is transformed through the liver to arsenic and may wreck the frame over time.
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coenzyme q carries electrons between which stages of the electron-transport chain? check all that apply.
Coenzyme q carries electrons between complex I and complex III, complex II and complex III of the electron-transport chain.
What is the electron transport chain?
A group of proteins called the electron transport chain transfers electrons across a membrane in the mitochondria to form a gradient of protons that fuels the synthesis of adenosine triphosphate.
NADH+ H+ → Complex I → Q → Complex III → cytochrome c → Complex IV → O2 ↑ Complex II ↑ Succinate
Coenzyme Q takes electrons from complex I (NADH dehydrogenase) and transfers four protons from the matrix to the intermembrane space at the same time as converting ubiquinone into ubiquinol and transferring the hydride ion from NADH to ubiquinone.
Electrons are passed to coenzyme Q from complex III =complex III (ubiquinone to cytochrome c) carry out couplings of transfer of electrons from ubiquinol (QH2) to cytochrome c. Here electrons are passed to coenzyme Q from complex III.
Hence, the answer is complex I and complex III, complex II and complex III.
Therefore, coenzyme q carries electrons between complex I and complex III, complex II and complex III of the electron-transport chain.
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