(D) [tex]Pb^{2+}[/tex]<[tex]NO_{3} ^{-}[/tex]=[tex]K^{+}[/tex] is the right answer for the ions remaining in solution in order of increasing concentration once the reaction has stopped.
What is concentration ?
The no of mol of solute present per litre of solution is known as molarity , for normality we consider no of equivallent of solute per litre of solution.
1 mol of [tex]Pb(NO_{3})_{2}[/tex] gives 2 mol of [tex]KNO_{3}[/tex] here 1.5 mol of [tex]Pb(NO_{3})_{2}[/tex] gives 3 mol of KNO3.
[tex]Pb(NO_{3})_{2} +K_{2}S- > PbS+ 2KNO_{3}[/tex]
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a 10.0 cm3 container of helium is sealed at 22.0 °c and 1.00 atm pressure. what pressure would be exerted by the helium if the container were heated to 220 °c?
1.67 atm pressure would be exerted by the helium if the container were heated to 220 °c
P1V1T2=P2V2T1
P2=P1V1T2/V2T1
** 1 atm. 10.0cm3.(220+273k)/ 10.00cm3.(22+273k)
P2= 1.67 atm
Per unit area, pressure is a force that is delivered perpendicularly to an object's surface. P = F/A in mathematics, where P represents pressure, F is force, and A is area. Having simply magnitude and no directed vector properties, pressure is a scalar quantity. The most well-known application of helium is as a secure, inflammable gas used to inflate balloons for celebrations and parades. Helium is a crucial element in a variety of industries, including national security, high-tech manufacturing, medical technology, and scientific research.
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suppose both the electron affinity of and the heat of sublimation of were smaller. would be more stable? or less?
If both electron affinity and heat of sublimation are smaller, then MX would be less stable.
M²⁺ + X⁻(g) → MX(s), + Lattice energy
Therefore, from the given thermodynamic cycle,
Lattice enthalpy = -100-800 = -900kJ/mol
Lattice enthalpy MX = -900kJ/mol
Enthalpy of the formation of MX is given as follows:
M(s) + 1/2X₂(g) --------->M(g) + 1/2 X₂(g)
Enthalpy of formation = +250 kJ
M(g) + 1/2X₂(g) → M(g) +X(g)
Enthalpy of formation = +350 kJ
M (g) + X(g) ------> M²⁺(g), + X(g)
Enthalpy of formation = +400 kJ
M²⁺ (g) + X(g) 24→ M²⁺(g), + X(g)
Enthalpy of formation = +200kJ
M²⁺(g), + X⁻(g)→ MX(s)
Enthalpy of formation= +900kJ.
Enthalpy of formation of MX = 250 +350 +406-200-900 = -100 kJ
Therefore, Enthalpy of formation of MX = -100 kJ
Since electron affinities are the heat released while the heat of sublimation is the heat absorbed then if electron affinity decreases while the heat of sublimation, increases then the overall enthalpy of formation of MX will be less negative. Hence in that case MX would be less stable.
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mg 2 naf → mgf2 2 na if you start with 5.5 grams of sodium fluoride, how many grams of magnesium fluoride will be produced?
If we start with 5.5 grammes of sodium fluoride, 4.1 grammes of magnesium fluoride will be created. Mg + NaF give rise to MgF2 + Na in a chemical process. This reaction uses sodium, or Na.
With the chemical formula MgF2, magnesium fluoride is an inorganic substance. The substance, which occurs as the rare mineral sellaite, is a white crystalline salt that is transparent over a broad range of wavelengths and is utilised commercially in the optics for space observatories. One set of chemical substances can change into another through a process known as a chemical reaction. Traditionally, chemical processes only affect the locations of electrons when establishing and rupturing chemical bonds between atoms.
5.5 g NaF (1 mol NaF/42.0 g NaF) (1 mol MgF2/2 mol NaF) (62.3 g MgF2/1 mol MgF2) = 4.1 g MgF2
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in the oxidation reaction of 9-fluorenol with sodium hypochlorite solution and glacial acetic acid, what is the reducing agent? enter the correct chemical name of the reducing agent.
Sodium thiosulfate, also known as Na2S2O3, is a reducing agent that interacts with any remaining oxidizing agent to quench it. (Thus, the name thiosulfate, which is similar to sodium sulfate with one O changed to a S.)
The inorganic chemical sodium thiosulfate has the formula Na2S2O3xH2O. Usually, it can be found as the pentahydrate Na2S2O35H2O, which is white or colorless. The solid is a well-dissolving efflorescent crystalline material.
Some of the negative effects of cisplatin may be mitigated with sodium thiosulfate. When treating cyanide poisoning in an emergency, it is additionally combined with another medication.
Hypo is an acronym for one of sodium thiosulfate's historically more popular names, hyposulfite of soda. A significant inorganic salt with numerous medical applications is sodium thiosulfate. It is also referred to as "hypo" sodium hyposulfite.
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which are examples of reversible reactions?
Answer:
- Pb(NO3)2+2NaI→PbI2+2NaNO3.
- AgNO3+HCl=AgCl+HNO3.
- 2Na+2H2O=2NaOH+H2.
- KNO3+NaCl=KCl+NaNO3.
An aqueous solution of an unknown solute is tested with litmus paper and found to be basic. The solution is weakly conducting compared with a solution of NaCl of the same concentration. Which of the following substances could the unknown be:NaOHCH3COCH3NH3H3PO3HNO3
H₃PO₃ could be the unknown substance.
NaOH and NH₃are all basic; so, they must not be the unknown solute since the solution is acidic.
CH₃COCH₃ is a nonelectrolyte, which means it does not dissociate into ions when it dissolves in water. Acetone must not be the unknown since the solution is weakly conducted.
The two remaining candidates, HNO₃ and H₃PO₃ are both acids. The unknown solution does not conduct electricity as well as a solution of NaCl of the same concentration, which means that the unknown acid must not dissociate to the same extent as NaCl. Both NaCl and HNO₃ (a strong acid) dissociate 100%. Thus, the unknown solute must be H₃PO₃, which is known to be a weak acid (doesn't dissociate 100%).
What is the H3PO3 name?
Phosphorous acid (or phosphonic acid) is the compound described by the formula H3PO3. This acid is diprotic (readily ionizes two protons), not tricrotic as might be suggested by this formula.
What are the two colors of litmus paper?
Litmus paper is a strip of paper extracted from lichens, which is dipped into a solution to determine if it is an acid or base. Litmus papers are available in two colors, red and blue. Acidic solutions will change the color of the blue litmus to red strips.
Thus, the unknown substance is H3PO3.
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use arrows to sketch the circulation in the estuary, including any upwelling/downwelling and freshwater transport across the sea surface, and indicate the volume transport associated with each of the arrows you have sketched.
The coriolis effect coupled with the frictional coupling of wind and water leads to the moving of surface water at 90° towards the right ward direction of the wind in the Northern hemisphere and to the left ward direction of the wind in the southern hemisphere.
Ekman transport helps surface water move away from the costal area.
Equatorial Upwelling occurs when surface water move farther away from the equator and becomes replaced by the Upwelling water.
The cause of the upwelling is due to the deviation of the sea currents by the rotation of the earth. In this way, the arrows that Josefina drew represent the movement of the water.
The second cause is due to the effect that the wind has on the sea.
Therefore must draw an arrow representing the wind to correctly represent the outcrop of the surface water.
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Which of the following provides the best explanation for why the water drop does not slide off the inclined plane?
O A The polar water molecules are absorbed by the underlying surface O B The polar water molecules cause the surface to become temporarily charged, causing adhesion
O C The polar water molecules exert strong cohesive forces on one another
O D The polar water molecules are repelled by the nonpolar surface
The option (b) is correct, Water induces dipole moment or polarity in the non polar molecule and thus polarize it momentarily.
What is polar?
a structure where the density of electrons is unbalanced. Nonpolar structures are those that have an electron density that is roughly uniform. Molecules' many physical, chemical, and biological properties are affected by polarity, which can take many different forms
What is molecules?
the tiniest component of an object that possesses all of its physical and chemical characteristics. The number of atoms that make up a molecule might vary.
Water induces dipole moment or polarity in the non polar molecule and thus polarize it momentarily. Thus it is attracted towards polar water molecule.
Therefore, option (b) is correct, Water induces dipole moment or polarity in the non polar molecule and thus polarize it momentarily.
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acetyl coa carboxylase generates malonyl-coa from acetyl-coa co2. in the biosynthesis of palmitate, what is the fate of the carbon atom in the co2 that was incorporated into malonyl-coa?
A 3-carbon dicarboxylic acid called malonate is linked to Coenzyme A in malonyl CoA. Using the biotin cofactor of the enzyme acetyl-CoA carboxylase, malonate is created from acetyl-CoA by adding CO₂ .
What is the source of malonyl-CoA?Acetyl-CoA carboxylase (Acc1p) produces malonyl-CoA, which is produced as the first and only step in the production of fatty acids. The activity of Acc1p is closely controlled both transcriptionally and post-translationally, and Snf1p protein kinase phosphorylation of Acc1p inhibits its activity.
Is malonyl-CoA an extender or starter?All forms of PKSs use malonyl-CoA as an extender unit. Malonyl-CoA is always incorporated into the developing polyketide through a decarboxylative Claisen condensation between the carboxyl group of a thioester and the enolate ion produced by malonyl-decarboxylation. CoA's .
Is CO2 used in fatty acid synthesis?Although CO2 or HCO3 are not absorbed into the fatty acids, the need for carbon dioxide as a bicarbonate ion is a crucial component in the production of fatty acids. This indicates a method where CO2 is initially given to a precursor, serving its role, and then eventually withdrawn.
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A student has a sample of ocean water that they take to science class. What steps could be taken to determine to classify the ocean water as a suspension, solution, element, or compound?.
an uniform combination known as a solution because seawater has the same properties across the entire mixture.
Is ocean water a substance or an element?There are numerous distinct chemicals in seawater. When the water in seawater evaporates and salt is left behind, some of these substances can be seen. Pure substance made of hydrogen and oxygen is called water, or H2O.Salts and water combine to form seawater. The salts are referred to as the solute and the water as the solvent in this mixture.Water is a common substance. Hydrogen and oxygen are the two elements that make up water.Water consists of two hydrogen atoms and one oxygen atom in each individual particle. The smallest component of a compound is a molecule.Because it contains the same concentration of each of its components throughout the solution and can be physically separated, salt water qualifies as a solution. and the O represent for the elements oxygen and hydrogen, respectively.To learn more about ocean water a substance or an element refer to:
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catalytic hydrogenation is classified as a 1,2-addition reaction. in this experiment, hydrogen was added to the alkene of 1-decene in a syn (cis) fashion. a) in the context of this reaction, explain what is meant by the term syn addition. b) explain the role of platinum metal (pt) in this syn addition reaction.
Catalytic hydrogenation is classified as a 1,2-addition reaction. in this experiment, hydrogen was added to the alkene of 1-decene in a syn (cis) fashion.
a) Syn: A process by which all new bonds are formed on one face of the reactant molecule during an addition reaction.
b) the role of platinum metal (pt) in this syn addition reaction is to be a catalyst and be a hydrogen quencher.
An addition reaction in organic chemistry is an organic process whereby two or more molecules come together to form a larger one (the adduct). Because they also have double-bond nature, molecules containing carbon—hetero double bonds, such as carbonyl (C=O) or imine (C=N) groups, can be added.
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Give the group number leg, 1A(1)I and general electron configuration (e.g, nsnp?) of an element with each electron-dot symbol: Group number: Electron configuration: Group number: Electron configuration:
The 5 electrons are present in the valence shell so group number 15 or VA or 5A electronic configuration ns^2 np^3, 4 electrons are present in the valence shell so the group number 14 or 1VA or 4 A electronic configuration ns^2 np^2.
What is an electron ?
The negatively charged components of an atom are known as electrons. All of an atom's electrons combine to form a negative charge that counteracts the positive charge of the protons in the atomic nucleus. In comparison to all the other components of the atom, electrons are quite tiny.
What is an electron configuration?
The placement of electrons in orbitals around a nuclear nucleus is known as electronic configuration, also known as electronic structure or electron configuration.
A, 5 electrons are present in the valence shell so group number 15 or VA or 5A electronic configuration ns^2 np^3.
B, 4 electrons are present in the valence shell so the group number 14 or 1VA or 4 A electronic configuration ns^2 np^2
Therefore, 5 electrons are present in the valence shell so group number 15 or VA or 5A electronic configuration ns^2 np^3, 4 electrons are present in the valence shell so the group number 14 or 1VA or 4 A electronic configuration ns^2 np^2.
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a sample of xenon gas occupies a volume of 6.51 l6.51 l at 473 k.473 k. if the pressure remains constant, at what temperature will this same xenon gas sample have a volume of 3.33 l?
Temperature will this same xenon gas sample have a volume of 3.33 l is 241.94k.
Charles' law states that the volume of a given amount of gas held at constant pressure is directly proportional to its Kelvin temperature. This means that as the temperature increases, the volume also increases, and vice-versa. The equation used to solve gas problems involving Charles' law is:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
Rearrange the equation given above to isolate T2 . Insert your data into the new equation and solve.
[tex]T_2=\frac{V_2 T_1}{V_1}[/tex]
[tex]T_2=\frac{3.33 L\times 473\mathrm{~K}}{6.51 \mathrm{~L}}[/tex]= 241.94k
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this reaction makes potassium superoxide useful in a self-contained breathing apparatus. how much o2 could be produced from 2.41 g of ko2 and 4.62 g of co2?
0.823 grams oxygen could be produced from 2.45 g of potassium dioxide and 4.62 grams of carbon dioxide.
Definition of Chemical reaction
Chemical reactions happen absolutely everywhere in our daily life. While we sometimes associate chemical reactions with only the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a wide range of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day.
Moles KO₂ = 2.41g/(71.1g/mole) = 0.034 moles
Moles CO₂ = 4.62g/(44g/mole) = 0.105 moles
4KO₂ + 2CO₂ → 2K₂CO₃ + 3O₂
The reaction requires twice as many moles of KO₂ than moles of CO₂. That means 0.105 mole of CO₂ would consume 0.034 moles of KO₂. But there is only have 0.034 moles of KO₂, so the limiting reagent is KO₂.
There are 3 moles of O₂ produced for every 2 moles of CO₂ consumed. In this case we'll assume all of the KO₂ reacts, so that should result in (3/4) × (0.034moles) = 0.025 moles of O₂ .
To get the mass, 0.025 mole × (32g/mole) = 0.823 grams O₂
Hence, 0.823 grams O₂ could be produced from 2.45 g of KO₂ and 4.62 grams o.f CO₂.
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How do weak intermolecular bond strengths affect the melting and boiling point of a substance?.
Intermolecular forces can be used to estimate relative boiling points (IMFs).The relationship between the substance's vapor pressure and boiling point depends on the strength of the IMFs.
What exactly is boiling point?The point at which a liquid's vapor pressure equals the gas pressure above it is known as the boiled point of the liquid. The temperature that a liquid's vapor pressure equals one atmosphere is considered the liquid's typical boiling point (760 torr). The view from a distance. view from a distance of a bubble in hot water.
What other name does boiling point go by?Boiling point and saturation temperature are synonyms. Sometimes the measurement's pressure serves as a definition for the boiling point. The standard boiling point was established by the International Alliance of Basic and Applied Chemistry (IUPAC) in 1982 as the temperature at which water boils at one bar of pressure.
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What is the net ionic equation when hydrobromic acid reacts with potassium hydroxide?.
HBr + KOH = KBr + H2O is the net ionic equation for the reaction between potassium hydroxide and hydrobromic acid.
What is an ionic equation and how to write it for the given reactants?In a chemical equation called an ionic equation, the electrolytes in aqueous solution are expressed as dissociated ions.
As a result of the reaction between hydrobromic acid and potassium hydroxide, potassium bromide and water are produced.
HBr ⇒ H⁺ + Br⁻
KOH ⇒ K⁺ + OH⁻
Then equation becomes,
HBr + KOH ⇒ H⁺ + Br⁻ + K⁺ + OH⁻
In this case, the water molecule is created via the reaction of the H+ ion and OH. While the KBr molecule is created when the K+ ion and Br ion react.
Hence, the net balanced ionic equation when hydrobromic acid reacts with potassium hydroxide becomes-
HBr + KOH = KBr + H₂O.
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calculate the formula mass of rubidium carbonate, rb2co3. 340.43 amu 255.00 amu 113.48 amu 230.95 amu 145.47 amu
The formula mass of rubidium carbonate is rb2co3. Then formula mass is 230.95a mu.
[tex]$\text { Wt } \text { of } R b & =85.4678$[/tex]
[tex]$\text { Wt } \text { of } c & =12.0107$[/tex]
[tex]$\text { Wt } \text { of } 0 & =16 $[/tex]
[tex]$\text { Wt } \text { of } R b_2 \omega_3 & =85.4678 \times 2+12.0107+16 \times 3$[/tex]
=230.946
so formula mass =230.95a mu.
The mass of a substance is given in atomic mass units and is calculated by adding the average atomic masses of all the atoms in the substance's chemical formula. The molecular mass is another name for a covalent compound's formula mass.
The total atomic masses of the component atoms of an ionic compound are used to define a substance's formula mass. This is typically used for ionic compounds, which are made up entirely of ions rather than distinct molecules. By summing the masses of each individual atom in the compound's formula, the formula mass is determined.
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what are the driving forces for double displacement reactions? consider the reaction below and determine the spectator ions. k2s(aq) 2hcl(aq) → 2kcl(aq) h2s(g) what is the driving force for the reaction in ii?
The Driving force for the given reaction is the formation of H2S (g)
What is a double displacement reactions?
Double replacement reactions—also known as double displacement, exchange, or metathesis reactions—take place when pieces of two ionic compounds are swapped, creating two new compounds.
What is a spectator ions?
Spectator ions are ions that are present on both sides of chemical reactions but do not actively participate in the reaction. The spectator ions on both sides of the equation cancel in the net chemical reaction.
1) Driving forces in double Displacement reactions
Type of reaction - Driving forces
Acid Base - Formation of water
Precipitation - Formation of a solid
Multiple - Formation of gas
2) Spectator ions: K+(aq), Cl-(aq)
3) Driving force for the given reaction is the formation of H2S (g)
Therefore, Driving force for the given reaction is the formation of H2S (g)
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why do different types of atoms (elements) give off or absorb different spectral lines? group of answer choices
Different types of atoms (elements) give off or absorb different spectral lines, Because the spacing of the energy levels is different in different atoms.
In physics, an energy levels, which is also known as an energy state, is any discrete number chosen from a range of total energies for a system of subatomic particles, such as an atom or a nucleus, that are held together by a force within a finite region. The rows of the Periodic Table of the Elements' columns match up with the atoms' energy levels when you look at it. The final electrons in the hydrogen and helium atoms in the top row are filling their initial energy level. The second energy level is being filled by the eight elements in the second row.
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consider the reaction. 2pb(s) o2(g)⟶2pbo(s) an excess of oxygen reacts with 451.4 g of lead, forming 349.3 g of lead(ii) oxide. calculate the percent yield of the reaction.
The percent yield of the reaction is 77.1% while forming lead oxide.
What is atomic mass?The atomic mass of a chemical element, expressed in atomic mass units. This roughly corresponds to the number of protons and neutrons in the atom (mass number), or the average number taking into account the relative abundance of different isotopes.
To calculate the percent yield, we need to determine the theoretical yield of the reaction. The theoretical yield is the amount of product that would be produced if all of the reactants were consumed in the reaction. We can do this by using the stoichiometric coefficients of the reactants and products. In this case, 2 moles of lead react with 1 mole of oxygen to produce 2 moles of lead(II) oxide.
How to calculate percent yield?Since we have 451.4 g of lead, that's equivalent to 0.799 moles of lead. From the stoichiometric equation,
We can determine that this would produce 0.799 moles of lead(II) oxide, which is equal to 349.3 g.
The percent yield is calculated by dividing the actual yield (349.3 g) by the theoretical yield (349.3 g) and multiplying by 100.
Step 1: Generate moles from 12g of phosphorus
30.97 grams of P divided by 12 grams of P gives you 0.39 moles of P.
Step 2: Using the formula: 0.39 moles of P * (3 moles of Cl2/2 moles of P) *(70.90 grams of Cl2/1 mol of Cl2) = 41.48 grams of Cl2
Since chlorine gas' supply depletes more quickly, it can be assumed that chlorine gas is the limiting reactant in this situation. Therefore, the theoretical yield of PCl3 produced should be calculated using chlorine gas.
Step 3: Calculate the moles of 35.5 grams of Cl2
0.501 moles of Cl2 are equal to 35.5 grams of Cl2*(1 mol of Cl2/70.90 grams of Cl2).
Step 4: Predict the amount of PCl3 created using mole ratios.
Therefore, the percent yield of the reaction is 77.1%.
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calculate the quantity of 0.001 m aq naoh needed to neutralize the hcl produced by complete solvolysis
The formula for the reaction between NaOH and HCl is NaOH + HCl = NaCl + H2O. So, the molar ratio of NaOH and NCl must be neutralize the solution. So, we require 150 milliliters, or 0.3*50/0.1.
What is the value of a molar?
A chemical's molar mass is its mass in grams per mole. The quantity of atoms, molecules, and ions contained in a substance is measured in terms of moles. A mole of any substance contains 6.022 x 1023 molecules.
What precisely is a molar?
The molars, also called molar teeth, are large, flat teeth located near the back of the mouth. Animals that are mammals have advanced more. Usually used to pulverize food while it is being eaten. The word "molar" is Latin in origin.
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the molecular geometry of the chf3 molecule is , and the molecule is . question 12 options: a) seesaw, nonpolar b) tetrahedral, polar c) tetrahedral, nonpolar d) trigonal pyramidal, polar e) seesaw, polar
the molecular geometry of the chf3 molecule is tetrahedral , and the molecule is polar.
Trifluoromethane, also known as fluoroform, is a compound with the molecular formula CHF₃.
This is because three fluorine atoms and one hydrogen atom are bonded to the central carbon atom, and the carbon atom has zero lone pairs. Therefore, the molecular structure and shape of CHF₃is tetrahedral.
A net dipole moment exists because the CHF₃molecule has three polar carbon-fluorine bonds. Therefore, CHF₃ is a polar molecule.
therefore,the molecular geometry of the CHF₃ molecule is tetrahedral , and the molecule is polar.
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suppose 14c-labeled co2 is used to form malonyl-coa from acetyl-coa. if this labeled malonyl-coa is used for palmitate synthesis, which carbon atom(s) in the fatty acid would be radiolabeled?
The structure of the acetyl-CoA is -[SEE aatachemt]
The structure of the malonyl-CoA is -[SEE aatachemt]
The structure of the palmitic acid is -[SEE aatachemt]
So from comparing all the three structures, it is evident that the terminal carbon with attached O= will be the suitable carbon to radiolabel the malonyl-CoA as this carbon will remain in the resultant palmitate molecule to trace down.
A crucial intermediary metabolite in the synthesis of fatty acids is malonyl-CoA. Malonyl-coenzyme A (CoA) is the substrate that serves as the main carbon source for the synthesis of palmitate (C16), which is catalyzed by fatty acid synthase, in de novo fatty acid synthesis.
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which postulate of the kinetic molecular theory breaks down under conditions of low temperatures? explain.
The postulate of the kinetic molecular theory that breaks down under conditions of low temperatures there is - "no attraction or repulsive forces between the gas particle."
The kinetic molecular theory's "there is no attraction or repulsive forces between the gas particle" premise is one of the postulates that fails at low temperatures. At low temperatures, this hypothesis does not hold up well because gas particles move more slowly at low temperatures than they do at high temperatures.
Due of the particles' slow mobility, they might be drawn to nearby particles by their slow motion. At low temperatures, these particles will be more likely to interact with the adjacent particles. Therefore, at low temperatures, there is an interaction force between particles.
Hence, "no attraction or repulsive forces between the gas particle" is the postulate which fails under low temperature.
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Equal volumes of 0.2 M solutions of lead (II) nitrate and potassium bromide are combined to form lead (11) bromide as a yellow precipitate. Which of the following is the correct net ionic equation for the reaction? (A) Pb 2+ (aq) + 2Br. (aq) → PbBra(s) (B) K. (aq) + NO3- (aq) → KNO3 (s) (C) Pb 2+ (aq) + 2NO3- (aq) + 2K+ (aq) + 2Br. (aq) → PbBr2(s) + 2K+ (aq) + 2NO3- (aq) (D) Pb(NO3)2 (aq) + 2KBr (aq) → PbBr2 (s) + 2KNO, (aq)
Pb²⁺ (aq) + 2Br(aq) → PbBr₂ (s) is the correct net ionic equation for the given reaction.
When equal volumes of 0.2M solutions of lead(II) nitrate and potassium bromide are combined, it forms a yellow precipitate of lead (II) bromide . This reaction is an example of a double displacement reaction.
A double replacement reaction is a chemical reaction in which mutual exchange of cations and anions of the reactants take place to form two different products. Usually, precipitates are formed in this reaction.
The reaction between lead(II) nitrate and potassium bromide takes place as follows:
Pb(NO₃)₂ (aq) + 2KBr (aq) → PbBr₂ (s) + 2KNO₃ (aq)
By splitting the electrolytes into ions we get the complete ionic equation which is written as:
Pb²⁺ (aq)+ 2NO₃⁻(aq) + 2K⁺(aq) + 2Br⁻(aq) → PbBr₂(s) + 2K⁺(aq) +2NO₃⁻(aq)
By cross eliminating the ions on both sides of the reaction , we get the net ionic equation which is given as:
Pb²⁺ (aq) + 2Br⁻(aq) → PbBr₂(s )
Hence option (A) is the correct net ionic equation for the given reaction.
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Nuclear decay occurs according to first-order kinetics. How long will it take for a sample of chromium-51 to decay from 35. 0 grams to 10. 0 grams? the half-life of chromium-51 is 28 days.
This sample of chromium-51 will degrade from 35 grams to 10 grams over the course of 84 days.
What is nuclear explain?This energy found in an atom's nucleus, or core, is referred to as nuclear energy. All everything in the cosmos is made up of microscopic building blocks called atoms, and the nucleus is held together by energy. A compact nucleus of an atom has a tremendous amount of energy.
Who is the world nuclear power?The United States, which will produce 771,638 GWh in nuclear energy in 2021, will be by far the greatest nuclear electricity generator, followed by China, which will produce 383,205 GWh. 56 reactors with a total power of 57,848 MWe and 438 reactors with such a net power of 393,333 MWe were operating as of August 2022.
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what atomic or hybrid orbitals make up the sigma bond between s and f in sulfur hexafluoride, sf6 ? orbital on s orbital on f what are the approximate f-s-f bond angles ? (list all possible) ... fill in the blank 3 °
Fluorine contains one total bond, three lone electron pairs, and is sp3, hybridized, thus our approximate bond angles will be 90 degrees. Sulfur is sp3 de hybridized.
What three hybrid orbitals are there?One s orbital and three p orbitals combine to generate four sp3 orbitals, each of which has a 25% s character and a 75% p character. This process is known as sp3 hybridization. Anytime an atom is surrounded by four groups of electrons, this kind of hybridization is important.
Describe hybridization using an example?The process of merging two atomic orbitals to produce a new variety of hybridized orbitals is known as hybridization. Typically, this mixing creates hybrid orbitals with entirely distinct energies, forms, and sizes.
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if increasing the oxidizing power of the environment causes the corrosion rate to slow, the material is known as
On increasing the oxidizing power of the environment, the corrosion rate slows, the material is known as Noble material.
What is corrosion?
Corrosion is a natural process that converts a metal into a more chemically stable oxide. It causes deterioration of materials by chemical or electrochemical reaction happening in their environment.
Noble material:A noble metal is regarded as a metallic chemical element that is generally resistant to corrosion and is usually found in raw form.
The corrosion rate increases when the oxidation increases. But, noble materials have good rate of oxidation resistance. So, when oxidation increases, the environment causes slow corrosion.
Therefore, answer is noble material
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Why are a weak acid and the salt of its conjugate base used in preparing a buffer, rather than a strong acid and a salt of its conjugate base?.
An acid is more acidic than its conjugate base if its pKa value is less than or equal to seven.
When making a buffer, why do you utilize a weak acid and the salt of its conjugate base?A weak acid and its conjugate base are present in high amounts in buffer solutions (or a weak base and its conjugate acid). Buffers are extremely resistant to fluctuations in pH because these ingredients may neutralize extra H+ or OH.
Why is it necessary to create a buffer solution using both an acid and a base?In buffers, basic species are present to neutralize H + ions and acidic species to do the opposite. These two species must, nevertheless, be able to coexist in a solution without fully negating one another.
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a gas mixture contains rn, he and n2. what is the total pressure of the mixture, if the mole fraction of n2 is 0.300 and the partial pressure of n2 is 0.520 atm?
According to Raoults law the total pressure of the mixture is 1.73a.
What is the contents of Raoult's law?
Describe Raoult's Law. According to Raoult's law, a solvent's partial evaporation rate in a solution (or mixture) is equal to or the same as the pure solvent's evaporation times the mole fraction present in the solution.
What is a case of Raoult's Law?
Let's say we have 100 mL each of water and ethylene glycol in two separate containers. We want to figure out the new vapor pressure of the mixture created when the two components are combined, given that the vapor pressure of pure water is 500 mmHg. Raoult's law is being directly applied in this case.
Briefing:
We can solve this problem using Raoults law. The formula for Raoults law is:
P_a = X_a * P
where,
P_a = the partial pressure of substance A
X_a = the mole fraction of substance A
P = total pressure
Therefore calculating for P:
P = P_a / X_a
P = 0.520/0.300
P = 1.73a
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