Predict the product of the following Wittig reaction. Be sure your answer accounts for stereochemistry, where appropriate. If multiple stereoisomers form, be sure to draw all products using appropriate wedges and dashes 1. PPh3 5-iodo-1-phenyl-1-pentanone 2. n-Buli 1st attempt l See Periodic Table See Hint e stereoisomers form, be sure to draw all products using appropriate wedges and dashes.
Answers
If more than one stereoisomer forms, be sure to depict each one with the proper wedges and dashes; the result is cyclopent-1-en-1-ylbenzene.
We have a Wittig reaction in this situation. The "Ylide compound" is created by mixing and n-Buli. The iodide will first be replaced by triphenylphosphine in a Sn2 reaction.
After then, the base n-Buli will eliminate an atom of hydrogen to create a double bond (Ylide compound). The double bond will then undergo delocalization, resulting in a carbanion.
The carbonyl group's carbon will be attacked by this carbanion, creating a negative charge in the oxygen. The phosphorus atom will then be attacked by the negative charge, creating a cyclic structure. In order to create the alkene, the cyclic structure is finally disrupted (cyclopent-1-en-1-ylbenzene).
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Related Questions
Atoms will combine with each in order to become more chemically stable. Compound are formed between two atoms that hare outer energy levels. The two types of compounds that can be formed between atoms are ionic and covalent. Ionic compounds are formed between two nonmetal ion. Metals will lose electrons to form positive ions and nonmetals will gain electrons to form negative ions. These oppositely charge ions are very attracted to each other and form very strong bonds as a result. lonic compounds are characterized by crystalline structure, Two: or more pairs of electrons. The force of attraction between the nonmetals is relatively weak. Covalent compounds are characterized by i meting and boiling points and can be gases, liquids, or soft solids at room temperature.
Answers
The majority of stable atoms share electrons. When two atoms share electrons, they establish a covalent bond. The result of sharing electrons are molecules, which are neutral particles.
Why does an atom's outer energy level reach its maximum when it is full?Due to the fact that all orbitals will be filled, an entire octet is exceedingly stable. A process that increases the stability of the atoms will release energy in the form of heat or light because more stable atoms have less energy.
What increases an atom's stability?Whether or not an atom's outermost shell is filled with electrons determines how stable the atom is. The atom is stable if the outer shell is filled. Because they are unstable, empty outer shell atoms typically form chemical bonds.
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The Cori cycle is a metabolic pathway that involves active muscles and the liver. fatty acids glucose → glucose glycolysis → ATP gluconeo- genesis ATP CO2 + H2O lactate lactate LIVER MUSCLE Complete the sentences about the Cori cycle. Muscles break down into , which undergoes glycolysis. The end product of glycolysis in active muscles is , which is transported in the blood. The liver uses energy from to drive The produced in the liver is transported to the muscle in the bloodstream. Answer Banklactate pyruvate fatty acid oxidation glycolysis glycogen gluconeogenesis glucose
Answers
The process of moving lactate from cells that are engaged in anaerobic metabolism to the liver, where it is used to deliver glucose back to the cells, is known as the Cori cycle.
It serves as an illustration of one of the vital functions of the liver in ensuring that the body has an adequate supply of glucose. Gluconeogenesis has examples like the Cori cycle. It is true that the Cori cycle uses the liver's gluconeogenesis to change the lactate that muscles create into glucose. To be utilized by other cells throughout the body, this freshly created glucose is discharged into the blood. The Cori cycle, which transforms lactic acid into Glycogen, which can be used as a source of energy, prevents the excessive accumulation of lactic acid.
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give the number of sigma bonds and pi bonds for the molecule below: 3 sigma bonds, 6 pi bonds 6 sigma bonds, 3 pi bonds 6 sigma bonds, 6 pi bonds 12 sigma bonds, 3 pi bonds
Answers
Benzene is a carbon and hydrogen compound with aromatic properties. The chemical formula for benzoene is C6H6.To determine the number of sigma bonds in this, we can create the skeletal structure using only sigma bond representations.
Let's show the structure of benzene.
As can be seen, there are six C-H bonds and six C-C bonds.
We may therefore say that benzene has a total of 12 sigma bonds in it.
When we look at the structure of benzene, we can see that it has three C=C bonds.
There are consequently 3 pi bonds and 12 sigma bonds. As a result, benzene contains 15 covalent bonds.
Since benzene has 12 and 3 sigma and pi bonds, respectively, the correct answer is that it does.
Additional
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which of the following is not a network solid? selected answer: correctc. co2(s) correct answer: correctc. co2(s)
Answers
We were aware that SiO2 is a network covalent solid and that CO2 is a molecular solid, but I'm not sure how I would go about determining that.
Each silicon and carbon have the same number of valence electrons, and they both contain two oxygen atoms. Because solid sulfur dioxide is a molecule and has covalent bonds, it is not a network solid even if it is a solid and has covalent bonds. An example of a network solid is diamond. One of the many forms of elemental carbon found in nature, diamond is an allotrope of carbon. On an atomic level, it resembles this. The carbon atoms are linked together by the lines.
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A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. Thie cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to release 390. kJ of energy The position of the piston is monitored, piston during the reaction and it is determined from this data that the system does 117-kJ of work on the piston during the reaction. is the reactio exothermic or endothermic ? O exothermic O endothermic Does the temperature of the water bath go up ar down? O up O down O neither Does the piston move in or out? O in O out O neitherDoes heat flow into or out of the gas mixture? O in O out O neither How much heat flows? Round your answer to 3 significant digits
Answers
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The heat is releases so the reaction is exothermic reaction.
a) since the reaction is releases the heat , so it is exothermic reaction.
b) the water temperature rises as heat flows in to the water.
c) as the heat will rises then the pressure will also rise the piston move in the outward direction.
d) as the pistons moves in the outward direction the gas mixtures works on surrounding.
e) the heat flows is the difference in the work done and is given as :
E = 390 kJ - 117kJ
= 273 kJ , the heat is releases by the reaction.
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when applied research is conducted in settings outside the laboratory, which of the following can be a problem?
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when applied research is conducted in settings outside the laboratory, the focus on a specific real world problem can be a problem.
The configuration and contents of laboratories are determined by the diverse needs of the specialists that work inside. A laboratory might have a particle accelerator or a vacuum chamber, whereas a metallurgy lab might have tools for casting, refining, or evaluating the strength of metals. A psychologist would utilise a room with one-way mirrors and covert cameras to examine behaviour in their lab, whereas a biologist or chemist might employ a wet laboratory. In laboratories, such as those where computer scientists typically operate, computers (and occasionally supercomputers) are sometimes utilised for either simulations or data processing. Scientists in other professions will continue to use a variety of labs. In laboratories, engineers build, assemble, and test technical objects.
The complete question is:
when applied research is conducted in settings outside the laboratory, which of the following can be a problem?
a. examines the basic laws of human behavior
b. is just as likely to occur in the laboratory as in the field
c. focuses on a specific real world problem
d. has no connection with theory
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curved arrows are used to illustrate the flow of electrons. follow the arrows to predict the intermediate and product of reaction nah
Answers
The arrows are used to illustrate the flow of electrons. follow the arrows to predict the intermediate and product of reaction , the product is :
CH₃ - C -CH₃ + H₂O + ⁻OCH₃
||
O
The reaction is in between the 2 methoxypropan-2-ol and the hydroxide ion. the OH⁻ ion is the strong nucleophile and contain the negative charged. the hydroxyl group acts as a proton of the compound is acidic because of the electronegativity difference. the hydroxyl ion takes protons and form the water.
The reaction is given as follows :
OH
|
CH₃ - C - OCH₃ + OH⁻ ----> CH₃ - C -CH₃ + H₂O + ⁻OCH₃
| ||
CH₃ O
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Any tips to learn the periodic table? Also what should I study (groups, numbers…)?
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Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood ________.A) pHB) PO2C) PCO2D) PCO2 and PO2E) PO2, pH, and PCO2
Answers
Specialized cells called peripheral chemoreceptors in contact with arterial blood react immediately to variations in blood PO2.
Carotid and aortic bodies, which are peripheral chemoreceptors, sense changes in arterial blood oxygen levels and set off reflexes that are crucial for preserving homeostasis in hypoxemia. The carotid (and aortic) bodies, which act as peripheral chemoreceptors, recognise arterial hypoxia and promote breathing. They give the brain stem a constant excitatory input at normal arterial PO2 (PaO2) values (6), and in hypoxia, they react dramatically as PaO2 drops below 70 Torr. With some help from [H+], peripheral chemoreceptors are particularly sensitive to changes in PaO2. The peripheral chemoreceptor hypoxic response predominates in situations where the receptors disagree, such as hypoxic hypocapnia, causing the respiratory drive to increase oxygenation despite additional reductions in CO2.
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Draw structural formulas for the product formed by treating each compound with propylmagnesium bromide followed by aqueous HCl.
(a) CH2O
(b) (c) (d)
Answers
The structural formulas for the product formed by treating each compound with propyl magnesium bromide followed by aqueous HCl is given as follows :
CH₃CH₂CH₂ - CH₂ - OH
butanol
The propyl magnesium bromide , the formula is given as follows :
CH₃CH₂CH₂ -MgBr
when it react with compound CH₂O , the product formed is the butan - 1 - ol. the structural formula is given as follows :
CH₃CH₂CH₂ - CH₂ - OH
butanol
The propyl magnesium bromide is acts as grinard reagent which react with CH₂O and will form the alcohol, that butanol. here the CH₂O is called as the formaldehyde.
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Design a synthesis of 2-ethyl-2-hexenoic acid from alcohols of four carbons or fewer alcohols containing 4 carbons or fewer
Answers
The enolates are the anions from the ketones. synthesis of 2-ethyl-2-hexenoic acid from alcohols of four carbons is :
butan - 1 - ol ------> 2-ethyl-2-hexenoic acid
The enolates ions will acts as a nucleophile in the SN² reaction . The alkyl group will replace the alpha hydrogen and then the carbon carbon new bond is formed . synthesis of 2-ethyl-2-hexenoic acid from alcohols of four carbons is given as :
CH₃ - CH₂ - CH₂ - CH₂ - OH + PCC --- > CH₃ - CH₂ - CH₂ - C - H
||
O
+ NaOH ----> CH₃ - CH₂ - CH₂ - CH = C - C - H
| ||
C₂H₅ O
+ H₂CrO₄ -----> CH₃ - CH₂ - CH₂ - CH = C - C - OH
| ||
C₂H₅ O
2-ethyl-2-hexenoic acid
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match each process of the nitrogen cycle with the form of nitrogen that is produced. labels may be used more than once.
Answers
Matching each process of the nitrogen cycle with the form of nitrogen that is produced is combustion: NO2; decomposition: NH4+; nitrogen fixation: NH4+; denitrification: N2; and nitrification: NO3-.
The nitrogen cycle refers to the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it moves among terrestrial, atmospheric, and marine ecosystems. It is a repeating cycle of processes during which nitrogen circulates through both living and non-living things: the atmosphere, soil, water, plants, animals, and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms. The conversion of nitrogen can be carried out through both biological and physical processes. The nitrogen converts into NO2 through stationary combustion and into NH4+ through decomposition. Fixation converts nitrogen in the atmosphere into forms that plants produce i.e., NH4+. Denitrification is the process that converts nitrate to nitrogen gas, producing N2. Nitrification is the process that converts ammonia to nitrite and then to nitrate producing NO3-.
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Points A to G are located on the phase diagram of water. Which of the following statements are correct regarding navigation from one point to another across the phase diagram? Check all that apply.
Moving from point A to point C, the temperature increases.
To move from point D to point F, you must decrease both the temperature and the pressure.
At point E, the temperature is less than 0 degree celsius%u2218C
To move from the point G to point F, you must increase both the temperature and the pressure.
To move from point C to point D, you must decrease only the pressure.
To move from point G to point B, you must increase the temperature.
Answers
Since points A to G are located on the phase diagram of water, the statements which are correct regarding navigation from one point to another across the phase diagram include the following:
A. Moving from point A to point C, the temperature increases.
C. At point E, the temperature is less than 0 degree Celsius.
D. To move from the point G to point F, you must increase both the temperature and the pressure.
E. To move from point C to point D, you must decrease only the pressure.
What is a phase diagram?In Science, a phase diagram can be defined as a type of chart that is typically used for the graphical representation of the thermodynamic conditions or physical states of a chemical substance or mixture of substances, usually under different conditions of temperature and pressure.
This ultimately implies that, a phase diagram is a type of chart (graph) which illustrates the limiting conditions for liquid, solid, and gaseous phases of a chemical substance or mixture of substances.
By critically observing the phase diagram shown in the image attached below, we can reasonably and logically deduce that the temperature increases when we move from point A to point C and it is less than 0 degree Celsius (0°C) at point E.
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mechanism of action that will produce diuretic effect- increase the number of particles in the tubular fluid . True or False
Answers
True, mechanism of action that will produce diuretic effect- increase the number of particles in the tubular fluid.
When the kidneys filter too much body fluid, it is called diuresis. As a result, you produce more urine and need to use the restroom more frequently. Diuresis may be brought on by specific medical disorders or by taking drugs that boost urine production. This illness can also be caused by lifestyle choices. Water tablets or diuretics are drugs that assist the body in eliminating extra fluid. They are frequently prescribed for illnesses like high blood pressure, chronic renal disease, and heart failure.
The kidneys are told to expel more water and salt via diuretics. This lessens edema and improves blood circulation throughout the body.
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Which of the following cations is isoelectronic with argon? 1.potassium ion 2.calcium ion 3.scandium ion 4.All of these 5.None of these
Answers
Option 1 is correct because potassium ions in argon contain 18 electrons. Thus, there are 18 isoelectronic in all that are present in Ar for K+. The electrical arrangement of these two ions is the same as that of Ar.
K+ and Cl ions are hence isoelectronic with Ar. Argon is isoelectronic with potassium ions that have a positive charge. For an ion with a -1 charge to become isoelectronic with argon, it would only have needed to gain 1 electron. Chlorine must have been present there.
Similar to the previous element, the next one can create a monovalent cation by losing one electron and isoelectronizing with argon. These include the potassium cation, K+, the chloride anion, Cl, and the sulphide anion, S2. Isoelectronic ions are said to have the same number of protons and electrons.
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in the dehydrohalogenation of 2-bromobutane which conformation below leads directly to thr formation of cis-2-butene
Answers
The conformation below in the dehydrohalogenation of 2-bromobutane results in the immediate production of cis-2-butene.
Dehydrohalogenation in chemistry is an elimination process that eliminates a hydrogen halide from a substrate. Although the reaction is frequently linked to the synthesis of alkenes, it has other uses as well.
A hydrogen halide is eliminated (removed) from a substrate during a dehydrohalogenation reaction. Although the reaction is frequently linked to the synthesis of alkenes, it has other uses as well.
The type of atoms or groups of atoms that leave the molecule serves as a frequent indicator of elimination reactions. Dehydrohalogenation, for instance, is the removal of a hydrogen atom along with a halogen atom; dehalogenation is the removal of two halogen atoms. Dehydration, on the other hand, is the removal of a water molecule, typically from alcohol.
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Conduct research to learn more about
the relative sizes, or atomic radii, of atoms. Find out how scientists define this
property, and identify specific examples
Answers
Chemical elements are classified according to their atomic radius, which is typically the average or typical distance between the centre of the nucleus and the outermost isolated electron.
How to define atomic radii of the atoms and what are its properties?The total distance from an atom's nucleus to its outermost electron orbital is typically defined as the atomic radius. It can be described more simply as something akin to the radius of a circle, with the nucleus acting as the circle's centre and the outermost orbital of the electron as the circle's perimeter. Trends explain how atomic radii change start to appear as you start moving across or down the periodic table. Some of the properties are:
The reactivity of the elements diminishes as we move down a group of non-metals, but it increases as we move down a group of representative metals.In general, the atomic radius increases when we walk down a group and reduces as we move from left to right in a period. By measuring the separation between the two atoms when two atoms are merged, we may determine the size of the combined atoms.Know more about atomic radii at:
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Which of the following is an observation of a chemical property?
Ozinc reacts with hydrochloric acid
density of wood is 0.51 g/cm³
water boils at 100°C.
sand paper is roughly textured
Answers
The right answer to the previous question and the correct observation of a chemical property is that zinc reacts with hydrochloric acid.
ZnCl2 +H2 = Zn +2HCL
Balanced equation:
ZnCl2 + H2 Zn + 2HCL
Zinc is a chemical element, designated by the symbol Zn and the atomic number 30. When the oxidation is removed, zinc turns shiny-greyish and at room temperature turns into a somewhat brittle metal.
All living things, including people, animals, plants, and microorganisms, depend on the trace metal zinc. It is the trace metal that is present in people in the second-highest concentration after iron. Zinc is an essential nutrient for development and a key cofactor for various enzymes. A lack of zinc can lead to a variety of diseases. Deficiency can lead to diarrhoea, infection susceptibility, and slower growth.
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1 Dilute hydrochloric acid reacts with sodium carbonate solution.
2HCl(aq)+Na2CO2(aq) →2NaCl(aq)+H2O(l)+CO2(g)
(a) Explain why effervescence is seen during the reaction.
(b) Dilute hydrochloric acid was titrated with sodium carbonate solution.
10.0cm³ of 0.100mol/dm³ hydrochloric acid were placed in a conical flask.
- A few drops of methyl orange indicator were added to the dilute hydrochloric acid.
- The mixture was titrated with sodium carbonate solution.
16.2cm³ of sodium carbonate solution were required to react completely with the acid.
(i) What colour would the methyl orange indicator be in the hydrochloric acid?
(ii) Calculate how many moles of hydrochloric acid were used.
mol1
(iii) Use your answer to (b)(ii) and the equation for the reaction to calculate the number of moles of sodium carbonate that reacted.
mol [1]
(iv) Use your answer to (b)(iii) to calculate the concentration of the sodium carbonate solution in mol2dm³.
(c) In another experiment, 0.020mol of sodium carbonate were reacted with excess hydrochloric acid.
Calculate the maximum volume (at r.t.p.) of carbon dioxide gas that could be made in this reaction.
Answers
The reaction 0.01 moles of HCL and 0.005 moles of sodium carbonate are employed.
(a) Carbon dioxide gas is released when sodium hydrogen carbonate and diluted hydrochloric acid interact. Carbon dioxide can be detected by passing it through lime water, which turns milky, or by observing the formation of a white precipitate of calcium carbonate. The gas's identity as carbon dioxide is therefore confirmed.
(b) i-When methyl orange is added to diluted hydrochloric acid, the solution's color changes to red. A common pH indicator used in the titration is methyl orange.
ii & iii Given:
0.1 molar in 10 milliliter With 16.2 ml of sodium carbonate solution, diluted HCL is titrated.
Solution:
How much HCL will be used—in moles.
Solution:
NaCl (aq) + CO2 (g) + H2O = Na2CO3 (aq) + 2 HCl (aq) (l)
Knowing that,
Molarity = (n/v)*100
For HCL remedy
0.1 = [n/10]*100
1.01 moles, or n.
2 moles of HCL are needed for 1 mole of sodium carbonate.
=> Half a mole of sodium carbonate is needed for every mole of HCL.
=> 0.005 mole of sodium carbonate is needed for every 0.01 mole of HCL.
Consequently, 0.01 moles of HCL and 0.005 moles of sodium carbonate are employed.
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Which of the following conjugated diene would not react with a dienophile in a Diels-Alder reactions?
Answers
Which of these conjugated dying's will not react are dienes that are in cisoid forn, which can react in dieals alder. In general, electron-withdrawing groups on the dienophile speed up Diels-Alder processes.
The locked trans dienes do not react in the Diels-Alder reaction, whereas the cyclic cis dienes are so reactive that they may react with one another, making these conformations two extremes. Because one molecule serves as the diene and the other as the dienophile, for instance, cyclopentadiene dimerizes. Bridged bicyclic compounds are produced by cyclic dienes. Diels-Alder reactions can only occur in conjugated dienes with the s-cis structure. A diene cannot conduct a Diels-Alder reaction if it is not conjugated or cannot be in the s-cis configuration. Ring-based dienes are incapable of rotating, hence
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Draw the Lewis structures for
the following particles. Which
one can exhibit resonance?
A. CO3-²
B. N2
C. CH₂Br2
D. CO₂
Answers
The next particles are CO2. which may have resonance
What exactly does it entail to show resonance?Resonance is a method for describing delocalized electrons inside particular molecules or polyatomic ions when the bonding cannot be captured by a single Lewis formula. Numerous resonance structures can be used to depict a molecule or an ion when the electrons are delocalized in this way.
What is the primary objective of resonance?What are resonance structures used for Resonance is a term used in valence bond theory to describe how different contributing structure (or forms, also called as resonance structures and canonical structures) come together to generate a hybrid resonance (and hybrid structure) in certain ions or molecules.
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Question 18
Identify the Type of Chemical Reaction: 2Ago - 2Ag + 02
1
Answer
F) Synthesis or Combination Reaction
G) Decomposition Reaction
H) Single Replacement Reaction
1 Double Replacement Reaction
K) Combustion Reaction
Answers
The given chemical reaction is type of decomposition reaction.
What is a decomposition reaction and how it takes place?One chemical splitting into two or more smaller molecules is known as a decomposition process. It is expressed as XY X + Y.
In this given question, the chemical reaction is:
[tex]2AgO[/tex] → [tex]2Ag + O_{2}[/tex]
Here, 2AgO decomposes into 2Ag and [tex]O_{2}[/tex]. That means a complex molecule is breaking down into two simple compounds.
A decomposition reaction is the exact opposite of a combination reaction. During decomposition, both exothermic and endothermic events can occur. One important application of decomposition processes is the extraction of metals from their ores. For instance, zinc can be recovered from calamine by subjecting it to a breakdown reaction.
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suppose of ammonium sulfate is dissolved in of a aqueous solution of sodium chromate. calculate the final molarity of ammonium cation in the solution. you can assume the volume of the solution doesn't change when the ammonium sulfate is dissolved in it. round your answer to significant digits.
Answers
The final molarity of the ammonium cation in the solution is 0.066M.
Firstly, we need to calculate the number of moles of ammonium sulfate:
No of moles = mass(g)/molar mass
No of moles = 2.57/132.14
No of moles = 0.0195 mol
When ammonium sulfate dissolves in sodium chromate, the following reaction will take place:
(NH₄)₂SO₄ + Na₂CrO₄ ------> (NH₄)₂CrO₄ + Na₂SO₄
No of Moles of sodium chromate = molarity x volume
= 66 x 0.200
No of moles of Sodium Chromate = 0.0132 mol
According to the reaction, 1 mol of sodium chromate produces 1 mol of ammonium chromate.
In this reaction, the sodium chromate amount is less than ammonium sulfate.
It can be concluded that Sodium chromate is a limiting reagent.
Therefore 0.0134 mol of ammonium cation is present in the resulting solution.
Molarity of ammonium cation = 0.0134 mol / 0.2 L
Molarity = 0.066 M
Therefore, 0.066M is the Molarity of the ammonium cation.
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Oil and methane hydrates are both physical ocean resources found beneath the seafloor. List two other similarities between oil and methane hydrates.
Answers
Crude oil is a mixture of nitrogen, sulphur, oxygen, and volatile hydrocarbons. Methane hydrate is a particular kind of clathrate made up of water and low molecular weight gases like methane.
Fossil deposits under the seafloor are what make up oil. It is an organic chemical that was created by the deposition of organisms on the seafloor. Additionally, methane hydrates are created after marine creatures deposit. Under the ocean's surface, one can find both oil and methane hydrates.
Similarities between both the Oil and methane hydrates are :
They both came from the ocean floor.They come from fossil fuels.They are created by decaying aquatic life.They are an energy source that is not renewable.They were mostly made of hydrogen and carbon.Both contribute to climate danger.Under high pressure and low temperature, they solidified.To learn more about Oil and methane hydrates refer here
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Which of the following alkyl halides would afford the indicated product upon reaction with sodium ethoxide? I II III or IV?
Answers
IV alkyl halides would afford the indicated product upon reaction with sodium ethoxide.
Alkoxide salt sodium ethoxide is primarily employed as a potent base in organic reactions such deprotonation, dehydration, and dehalogenation. Water and atmospheric carbon dioxide are both likely to react with sodium ethoxide. Even in solid form, this causes samples that have been preserved to degrade with time. Sodium ethoxide samples eventually turn dark when stored, yet the physical appearance of degraded samples may not be noticeable. Ethoxide serves as the counterion in sodium ethoxide, an organic monosodium salt. It performs a function as a nucleophilic reagent.
Which of the following alkyl halides would afford the indicated product upon reaction with sodium ethoxide? I II III or IV?
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The decomposition of a single compound at 349 K has a rate constant of 4.10 x 10-3 M s1. If the initial
concentration of the reactant is 1.304 M, what is the concentration of the reactant after 90.45 seconds?
(the answer should be entered with 3 significant figures; do not enter units; give answer in normal
notation-examples include 1.23 and 12.3 and 120. and -123)
Selected Answer:
Correct Answer:
0.933
0.933 ±1%
Answers
Answer: To solve this problem, you can use the first-order rate equation, which is given by:
[reactant] = [reactant]0 * e^(-k*t)
where [reactant] is the concentration of the reactant at time t, [reactant]0 is the initial concentration of the reactant, k is the rate constant, and t is the time.
Plugging in the given values, we get:
[reactant] = 1.304 M * e^(-4.10 x 10^-3 M s^-1 * 90.45 s)
= 1.304 M * e^(-0.0366)
= 1.304 M * 0.933
= 1.21 M
To express the answer with 3 significant figures, you can round the answer to 1.21 M. Therefore, the concentration of the reactant after 90.45 seconds is 0.933 ± 1%.
Which of the following is the correct Lewis structure for the molecule NH3?
N=H
Option 1
H-N-H
Option 3
-I
H
H=N:
Option 2
H-N-H
H
Option 4
Answers
The Lewis structure of ammonia, NH
3
, would be three hydrogen-bonded to a nitrogen atom in the middle, with a lone pair of electrons on top of the atom. This is the reason why ammonia acts as a Lewis base, as it can donate those electrons.
solution
OPTION 3 IS THE ANSWER
Water boils at 100 degrees Celsius. What is the boiling point for water on the Kelvin scale? K = °C + 273 and °C = K - 273
Answers
Answer:
the answer is 373
Explanation:
K=°C + 273
K=100+273=373
Which of the following equations represents a reaction for which the standard entropy change is positive?
a) 3 O₂(g) --> 2 O₃(g)
b) 2 H₂(g) + O₂(g) --> 2 H₂O(l)
c) CaCO₃(s) --> CaO(s) + CO₂(g)
d) I₂(g) + 2 K(s) --> 2KI(s)
Answers
The correct response is A) The change in gaseous moles n g must be largest, indicating the formation of more gaseous products, which enhances unpredictability and, hence, entropy positive.
Entropy increases as a substance transitions from a solid to a liquid to a gas, and by observing the phases of the reactants and products, you can determine if an entropy change is positive or negative. Entropy will rise once the number of gas moles increases. The environment's negative entropy change is significantly outweighed by the system's positive entropy change. We can see that the system's entropy change is positive.
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Define the following: Renwable energy and non-Renwable energy.
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A resource can be classified as renewable or nonrenewable based on whether it can replace itself at the rate it is used up or whether it has a finite supply.
What exactly is renewable energy?Energy obtained from natural resources that are renewed more quickly than they are used up is referred to as renewable energy. Such sources that are constantly replenished include the sun and the wind, for instance. Non-renewable energy comes from energy sources that will ultimately exhaust themselves or cannot be regenerated, not even after countless ages. Fossil fuels, such as petroleum, natural gas, and coal, are the non-renewable energy sources that are most often used.A resource can be classified as renewable or nonrenewable based on whether it can replace itself at the rate it is used up or whether it has a finite supply. Timber, wind, and solar power are examples of renewable resources, whereas coal and natural gas are examples of non-renewable resources.To learn more about Renewable energy refer to:
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