Answers
Answer:
1) 4.21 x 10^24 molecules of Fe2O3
2) 36.416g of O2
Explanation:
1) First, find moles of Fe2O3 by using the mole ratio of 3:2. Fe2O3 has a coefficient of 2, and O2 has a coefficient of 3 thus making their mole ratio 2:3. Then, multiply 10.5 moles of O2 by 2/3 which equals 7 moles of Fe2O3. Finally, convert moles of Fe2O3 to molecules by multiplying it by Avogadro's number.
10.5 mol x 2/3= 7 mol Fe2O3
7 mol multiplied by 6.02 x 10^23 = 4.21 x 10^24 molecules
2) First, convert grams of KClO3 to moles by dividing it by its molar mass(approximately 122.5 g), which equals .759 mol. Then find moles of O2 by multiplying .759 mol KClO3 by the mole ratio of O2 to KClO3, which is 3:2. That equals 1.138 moles of O2. Finally, convert moles to grams by multiplying 1.138 mol by the molar mass of O2 (approximately 32g). 36.416g of O2 is your final answer.
93g KClO3/ 122.5g = .759 mol KClO3
.759 mol x 3/2= 1.138 mol O2
1.138 mol x 32g= 36.416g O2
Answer:
See Explanations ... I'll have to deliver my explanation in two posts. One is beyond the limits allowed.
Explanation:
Stoichiometry is very easy if you understand the relationship between the 'mole' and the balanced chemical equation. Let's start by defining the 'mole'
The 'mole' of substance is the mass of substance (element or compounds) that contains 1 Avogadro's Number ( = 6.02 x 10²³ ) of particles. The mass of substance that does contain 1 Avogadro's Number of particles is 1 formula weight of substance (also, molecular weight of substance). That is,
1 mole = 1 formula wt. = 1 mole weight = 1 Avogadro's Number = 6.02 x 10²³ particles of substance.
So, assuming you can determine formula weight then that value expressed in terms of grams is a 'Gram Formula Weight'; that is, 1 GFW = 1 mole wt.
At this point it is assumed that you understand how to balance simple chemical equations by inspection. That is, by the Law of Mass Balance ...
total mass of reactants = total mass of products
In problem 1 you are given iron (Fe) + molecular oxygen (O₂) => iron(III) oxide (Fe₂O₃) ... 4Fe + 3O₂ => 2Fe₂O₃ ... ∑mass R = ∑mass P.
Now, focus on the coefficients of each substance, that is, 4 for Fe, 3 for O₂ and 2 for Fe₂O₃. These values (coefficients) are moles of each substance in a special type of equation called the 'Standard Equation'. The Standard Equation is one which when balanced its coefficients are in the smallest whole number mole ratio of substance. That is the equation above is showing 4 moles of Fe, 3 moles of O₂ and 2 moles of Fe₂O₃. This is important in that most balanced equations that will be given in textbook problems will be in Standard Form.
From the Standard Form, the coefficients can be doubled, or divided in half, or whatever multiple or fraction one desires. The reaction would still perform in correct proportions. However, the multiples or fractions would not be in Standard Form. Most, if not all, stoichiometry problems will provide only the Standard Form.
Example, let's take the given equation above (from problem 1)
4Fe + 3O₂ => 2Fe₂O₃.
Both of the following are in correct proportions and will react with respect to the proportions YOU choose ...
(multiply by 2) => 8Fe + 6O₂ => 4Fe₂O₃.
(dividing by 2) => 2Fe + 3/2O₂ => Fe₂O₃.
Both are balanced and conform to the Law of Mass Balance but are not in Standard Form. Oh, and the Standard Form equations are assumed to be at 0°C and 1 atm, even if not specified in the problem. You may not need that now, but will become important in Gas Laws.
Let's move on to stoichiometry calculations. There are several methods being taught within the chemed. community, but I'm going to focus only on using mole ratios.
My approach begins with this rule => convert reaction data to moles, solve using mole ratios and convert to needed dimension at the end of the problem. This will simplify a lot of problems once you understand what it's about.
OK, for problem 1 ...
How many molecules of Fe₂O₃ can be produced from 10.5 moles of O₂?
Given the Standard Form equation 4Fe + 3O₂ => 2Fe₂O₃.
Now, write (neatly) the equation and list the givens under the specific substances ...
4Fe + 3O₂ => 2Fe₂O₃.
ex* 10.5 moles ? molecules note: ex* = excess (not used)
In this problem, since O₂ is already in terms of moles no conversion needed.
What you need to focus on is the relationship between the coefficients of O₂ and Fe₂O₃. Note that the coefficient of Fe₂O₃ is SMALLER than the coefficient of O₂. This means that the number of moles of Fe₂O₃ formed will be smaller than moles of O₂ given, that is 10.5 moles. How much smaller? Easy Calculation => Take the coefficient of O₂ and the coefficient of Fe₂O₃ and make a ratio of the numbers that will make 10.5 SMALLER. That is, you should use 2/3(10.5) to get a smaller number, not 3/2(10.5) because that would give a larger number and inconsistent with the ratio given in the balanced equation.
So, moles of Fe₂O₃ produced = 2/3(10.5) moles Fe₂O₃ = 7 moles Fe₂O₃. Note that 7 moles is smaller than 10.5 moles.
Now, the number of molecules of Fe₂O₃ is also an easy calculation.
Remember that 1 mole contains 6.02 x 10²³ particles, then 7 moles would contain ...
= 7 moles Fe₂O₃ x 6.02 x 10²³ molecules Fe₂O₃/mole Fe₂O₃
= 4.21 x 10²⁴ molecules Fe₂O₃.
Go to 2nd post for problem 2 solution.
Related Questions
If a ball is bounced from a building which ball is the Kinetic energy the highest? (photo attached) [i was stuck because one of the balls hit the ground and bounced back up]
Answers
Answer: The place where the kinetics energy is the highest is where the ball struck the ground.
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Answers
When there is a separation of charge, dipole moments happen. Dipole moments, which result from variations in electronegativity, can happen between atoms in a covalent link or between two ions in an ionic bond.
The dipole moment increases with the difference in electronegativity. The size of the dipole moment is also affected by the distance between the charge separations. The polarity of the molecule is determined by the dipole moment. A dipole moment is produced when electrons are distributed unevenly among atoms in a molecule. This happens when one atom possesses a lone pair of electrons and the difference in electronegativity vector points in the same direction, or when one atom is more electronegative than another, causing that atom to pull more strongly on the shared pair of electrons. The water molecule, which consists of one oxygen and two hydrogen atoms, is one of the most prevalent instances. Each hydrogen has a partial positive charge, while oxygen has a partial negative charge due to variances in electronegativity and lone electrons.
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to remove 99% of benzene (c6h6) from groundwater contaminated with 5 mg/l benzene using advanced oxidation. if the groundwater is pumped at 100 gallon per minute, how much benzene
Answers
After solving the equation benzene is 2.698 kg is the correct answer.
Description of the answer
1 day = 24 hrs = 24×60 minute = 1440 minutes
concentration of benzene in groundwater = 5 mg/l
100 gallon = 378.541 L
100 gallon/minute = 378.541 L/minute
100 gallon (378.541 l) benzene contaminated groundwater is being pumped per minute, therefore the volume of groundwater being pumped in one day (i.e. 1440 minutes) = (378.541 × 1440) l = 545099.04L
Since 1 l groundwater is contaminated with 5 mg benzene, therefore 545099.04 l groundwater is contaminated with = (545099.04 × 5) mg = 2725495.2 mg = 2725.495 g = 2.725 kg
Thus, 545099.04 l groundwater is pumped per day, which contains a total of 2.725 kg benzene as contamination.
Since 99% benzene from groundwater has to be removed, therefore benzene waste (kg) needed to be treated per day = (2.275 × 99 / 100) kg = 2.698 kg.
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a long-cherished dream of alchemists was to produce gold from cheaper and more abundant elements. this dream was finally realized when 198hg 80 was converted into gold by neutron bombardment. write a balanced equation for this reaction. include both the atomic number and mass number of each species.
Answers
In 1941, gold was created by neutron bombardment from mercury, but the isotopes were all radioactive.
Neutron bombardment: what happens?What is neutron irradiation? When a high-energy neutron bombards a nucleus to start nuclear fission, more neutrons are released during the process. A neutron has no charge, thus when it is pointed at the nucleus, it is not repulsed.
What occurs when uranium is irradiated with neutrons using the mentioned apparatus?When uranium-235 is irradiated with neutrons, the uranium atoms split, releasing heat and atoms with decreasing atomic numbers as well as more neutrons. Similar to typical fossil fuel power plants, this process, known as fission, may harness the heat produced to produce electricity.
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Which will shows maximum depression in freezing point when concentration is 0.1 m?
Answers
K2SO4 has the most ions out of the options, which means its freezing point will degrade the most.
What substance has the lowest freezing point, 0.1 M?Which aqueous solution with a concentration of "0.1 M" will have the lowest freezing point
UThe answer is "K 2SO 4" ionises to produce three ions, increasing the effective molality of the solution by three times. Its freezing point is therefore the lowest.
Which substance has the highest freezing point for 0.1 M glucose?Since 1M glucose solution does not go through dissociation to produce more particles, it has a lower
which results in a higher freezing point
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What is the final step in the enzyme-substrate complex?
Answers
In the final step of the enzyme substrate complex, the product leaves the active site of the enzyme .
The whole process of enzyme substrate complex is a temporary molecule formed when an enzyme comes into perfect contact with its substrate. Without its substrate an enzyme is a slightly different shape. The substrate causes a conformational change when the substrate enters the active site. The active site is the area of the enzyme capable of forming weak bonds with the substrate. some enzyme functions independently. This shape change can force two or more substrate molecules together or split individual molecules into smaller parts. Most reactions that cells use to stay alive require the actions of enzymes to happen fast enough to be useful. It is influenced by temperature and pH.
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Predict the charge that a strontium ion would have. 2- 2+ 4- 6-
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Sequence Determination of the Brain Peptide Leucine Enkephalin A group of peptides that influence nerve transmission in certain parts of the brain has been isolated from normal brain tissue. These peptides are known as opioids, because they bind to specific receptors that also bind opiate drugs, such as morphine and naloxone. Opioids thus mimic some of the properties of opiates. Some researchers consider these peptides to be the brain�s own pain killers. Using the information below, determine the amino acid sequence of the opioid leucine enkephalin. Explain how your structure is consistent with each piece of information.(a) Complete hydrolysis by 6 M HCl at 110 C followed by amino acid analysis indicated the presence of Gly, Leu,Phe, and Tyr, in a 2:1:1:1 molar ratio.(b) Treatment of the peptide with 1-fluoro-2,4-dinitrobenzene followed by complete hydrolysis and chromatography indicated the presence of the 2,4-dinitrophenyl derivative of tyrosine. No free tyrosine could be found.(c) Complete digestion of the peptide with chymopepsin followed by chromatography yielded free tyrosine and leucin plus a tripeptide containing Phe and Gly in a 1:2 ratio.
Answers
Option C) "are digested by proteases into both opiate and non-opiate peptides" is the correct response.
Like all other propeptides, the opioid propeptides is a protein precursor that must be cut into a smaller form to become active. Proteases convert the opioid propeptides into opiate and non-opiate peptides, the latter of which may or may not be active. Enkephalins, endorphins, and dynorphins, which are opiate peptides, work by blocking secondary systems, such as those that affect how pain is perceived.
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What is the freezing point of a solution containing 8.1 g HBr in 100g water assuming?
Answers
The freezing point of the solution is -3.53°C.
The Chemical equation of the HBr is -
HBr → H⁺ + Br ⁻
Initial - 1 0 0
Final - 1-α α α
The total moles = 1 - α + α + α
= 1 + α
half factor = i = Total mol / Initial mol
= 1 + α / 1
= 1 + α
Now, Evolution in freezing point
ΔT f = i Kf m
kf = 1.86 (given)
m(molality = mass of solute / solvent (Kg))
Δ T f = (1 + α) × 1.86 × (mass/molar mass ) / solvent
[ α = 90/100 = 0.9 because 90% ionised]
putting the values in above equation -
= (1 + 0.9) × 1.86 × (8.1 × 1000) / 81 × 100(gm)
ΔT = 3.53°C
Then freezing point T f = T° f - ΔT
= 0 - 3.53°C
T f = -3.53°C
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Complete Question -
What is the freezing point of a solution containing 8.1 g HBr in 100gm. water assuming the acid to be 90% ionised:
[Kf for water =1.86Kmolarity^−1 ]
Use bond enthalpies to estimate the enthalpy change for each of the following reactions.
H2C=O(g)+HCl(g)→H3C−O−Cl(g)
H2O2(g)+2CO(g)→H2(g)+2CO2(g)
3H2C=CH2(g)→C6H12(g)
Answers
The enthalpy changes for each of the following reactions are:
H2C=O(g)+HCl(g)→H3C−O−Cl(g) = 256kJH2O2(g)+2CO(g)→H2(g)+2CO2(g) = 636kJ3H2C=CH2(g)→C6H12(g) = -164kJThe difference between total reactant and total product molar enthalpies estimated for substances in their standard states is the standard enthalpy of reaction for a chemical process. The quantity of heat evolved or absorbed in a process under constant pressure is referred to as enthalpy change. It is assigned the symbol ΔH, interpreted as "delta H".
Enthalpy is the product of internal energy and pressure multiplied by volume. We can't measure a system's enthalpy, but we can look at variations in enthalpy. The sum of internal energy (U) and the product of pressure (P) and volume (V) equals enthalpy (H) (V). The system's heat added or lost is quantified as a change in enthalpy (H), not the actual amount of heat.
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One event in a high school track meet is the 400 meter run. If the runners of the 400
meter event start and end at the same location, what is their DISTANCE?
0 meters
© 200 meters
0 400 meters
800 meters
Answers
Answer:
400 meters
Explanation:
Distance is the amount traveled. It doesn't matter if the runners start and end in the same place for distance, they still travel 400 meters.
the accompanying photo shows the reaction between a solution of cd(no3)2 and one of na2s.
Answers
The Precipitate formed is of CdS and the ions remaining are Na+ and NO3-.
The complete balanced chemical reaction is as follows:
Cd(NO3)2 + Na2S → CdS + 2NaNO3
Precipitation in an aqueous solution is the process of converting a dissolved component into an insoluble solid from a supersaturated solution. The precipitate is the solid that forms. In chemistry, a solid generated by a change in a solution, usually owing to a chemical reaction or a temperature shift that reduces the solubility of a solid.
A chemical may precipitate when its concentration exceeds its solubility. This can be caused by temperature fluctuations, solvent evaporation, or solvent mixing. A severely supersaturated solution precipitates more quickly.
A chemical reaction can result in the development of a precipitate. A white precipitate of barium sulphate is created when a barium chloride solution combines with sulphuric acid.
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What is the freezing point of a solution of 15.0 g nacl 250g water?
Answers
The freezing point of a solution of 15.0 g NaCl (sodium chloride) and 250 g water is -4.4°C.
What is freezing point?Freezing point is the tempreture at which a liquid turns into a solid. It is the temperature it is the molecules of liquid stop moving really and start to format solid crystal structure.
This is because the freezing point depression of a solution is proportional to the molality of the solute. The molar mass of NaCl is 58.44 g/mol, so the solution has a molality of 0.25 m. Using the formula for freezing point depression, ΔTf = i Kf m, where i is the van't Hoff factor (2 for NaCl), Kf is the freezing point depression constant (1.86°C/m), and m is the molality, we can calculate that the freezing point depression of this solution is 0.46°C, resulting in a freezing point of -4.4°C.
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When one s and three p orbitals hybridize?
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Since the number of hybrid orbitals equals the number of atomic orbitals, 4 hybrid orbitals are created by combining 4 atomic orbitals of the same atom.
Thus, four hybrid orbitals with a tetrahedral structure will be formed by the 1 s and 3 p orbitals.
What is Hybridization ?The process of hybridization is the mixing of atomic orbitals with the same energy levels to create an equal number of new hybrid orbitals. This mixing typically produces hybrid orbitals with completely distinct energies, geometries, etc.
When two atomic orbitals in a molecule combine to generate a hybrid orbital, the energy of the orbitals of the individual atoms is redistributed to give orbitals of equivalent energy. Hybridization is the name of this procedure.
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What would be the freezing point of an aqueous solution containing 17g of c2h5oh in 1000g of water?
Answers
The freezing point of an aqueous solution containing 17g of c2h5oh in 1000g of water −0.69 degree celcius
What is freezing point?
When the temperature of a liquid falls below its freezing point, it transforms into a solid. According to the internationally accepted definition, freezing is the solidification phase change of a liquid or the liquid content of a substance caused by cooling.
Most substances have the same melting and freezing points; however, certain substances have different solid-liquid transition temperatures. Agar, for example, exhibits hysteresis in its melting and freezing points. It melts at 85 °C (185 °F) and solidifies at 32 °C to 40 °C (89.6 °F to 104 °F).
Hence, the freezing point of an aqueous solution containing 17g of c2h5oh in 1000g of water −0.69 degree celsius
△T f = K f × m B ×w A. w B ×1000
=1.86× 46×100017×1000
=0.69
∴ Freezing point of solution =0−0.69=−0.69 degree celsius
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Please help me :,(……
Answers
Answer:
Study 'atom'
Explanation:
atoms are in the building blocks for molecules. the atom has protons and neutrons in its nucleus and electrons revolving around it. An atom can survive in its surrounding by either sharing electrons or by transferring electrons. Protons are positively charged and electrons are negatively charged. They are also called subatomic particles. When atoms lose electrons they get positively charged, and when they gain electrons they get negatively charged. When a metal is reacting with a non-metal, the metal is positively charged and transports an electron to the non-metal. The metal becomes positively charged and the nonmetal becomes negatively charged. the metal becomes the cation and the nonmetal becomes the anion. Thus, reactivity can cause gain or loss of charges.
Soil is a mixture of _______. A. Solidsb. Solids, liquids, and gasesc. Solids and liquidsd. Solids and gases please select the best answer from the choices providedabcd.
Answers
Answer: What is soil? In short, soil is a mixture of minerals, dead and living organisms (organic materials), air, and water.
Explanation:
Soil is a mixture of solids, liquids, and gases. Therefore, option B is correct.
What do you mean by soil ?Broken-down organic matter termed humus, living creatures, and broken-down rocks and minerals make up soil. Humus is nutrient-rich, squishy, and black.
Soil is a heterogeneous combination because it is made up of tiny fragments of various components. Water is an object. Water is a compound because it contains both hydrogen and oxygen. The substance oxygen is an element.
In addition to a porous phase that contains water and gases, soil consists of a solid phase made up of minerals and organic matter. The three states of soil are thus solids, liquids, and gases.
Thus, option B is correct.
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a sample of n2(g) effuses through an orifice in 125 seconds. how long will it take the same amount of propane, c3h8, to effuse through the same orifice under the same conditions?
Answers
After solving the equation the Molecular mass is 254 s is the answer.
What is Molecular mass?
Molecular mass is the sum of the atomic masses of all the atoms present in a molecule. It is an important property of molecules that is used in determining the chemical and physical properties of the molecule. Molecular mass is usually expressed in units of atomic mass units (amu) or daltons (Da). It is important to note that the molecular mass of a compound is not necessarily equal to the sum of the atomic masses of its constituent atoms, as the atoms in a molecule may be bound together by covalent bonds, which can alter their individual masses. Molecular mass can be calculated by adding the masses of the individual atoms present in the molecule. This value can be used to determine the identity of the molecule and its properties. Additionally, the molecular mass of a compound can be used to calculate the molar mass of the compound, which can be used to calculate the amount of a substance present in a given volume.
First we calculate,
Molecular mass of propane C3H8
= 3 x 12 + 1 x 8
= 44 gm/ml
Now, calculate amount of propane, c3h8, to effuse through the same orifice under the same conditions:-
[tex]t_{N2}[/tex]/[tex]t_{C3H8}[/tex] = [tex]\sqrt{28 gm/ml/ 44gm/ml}[/tex]
= 0.49
[tex]t_{C3H8}[/tex] = 125 s/0.49
= 254 s is the answer.
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Compare and interpret the infrared spectra of 4-methylcyclohexene and 4-methylcyclohexanol.
Answers
The IR spectrum of ethene is rather simple due to its simple structure.
How will you interpret the IR spectra of ethene?The interpretation of infrared spectra involves the connection of absorption bands in the spectrum of an unknown composite with the known absorption density for types of bonds,
The right-hand part of the infrared spectrum of ethane, wavenumbers ~1500 to 400 cm-1 is examined in the fingerprint region. This is a very neat tool for interpreting IR spectra.
So we can conclude that Interpretation of the infrared spectrum of ethene There are osmosis bands at ~1400 cm-1 due to scissoring H-C-H vibrations and ~3100 cm-1 from H-C-H
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Is starch an ionic or covalent compound?
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Starch is a covalent compound because no ions is present in it.
A covalent bond is made from the mutual sharing of one or more pairs of electrons between two atoms. These electrons in a covalent bond are simultaneously attracted by the two atomic nuclei. A covalent bond is formed when the difference between the electronegativities of two atoms is too small for an electron transfer to occur and to form ions.
Starch is composed of long chains of glucose molecules that are bonded together through covalent bonds called glycosidic bonds. As starch contains covalent bonds it it, so it is a covalent compound.
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What happens to pyruvate in the absence of oxygen?
Answers
Pyruvate undergoes fermentation, which transforms it into lactic acid inside the absence of oxygen.
The breakdown of the drug occurs throughout this process. similar to how pyruvate is converted into lactic acid.
An organic acid contains lactic acid. Its chemical formula is CH 3CH(OH)COOH.
It serves as a synthesis precursor inside a number of biochemical as well as molecular synthesis industries.
The final result of the glycolysis pathway, pyruvate, is transformed into lactic acid inside the lack of oxygen.
Glycolysis
The process through which glucose gets broken down to provide energy is known as glycolysis.
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Classify each of the following proteins according to its function.
Part A
insulin, a hormone needed for glucose utilization
___
Part B
antibodies, proteins that disable foreign proteins
___
Part C
casein, milk protein
___
Part D
lipases that hydrolyze lipids
___
Answers
The classification of each protein is:
A. HormoneB. Immune System ProteinC. Structural ProteinD. EnzymeThe Importance of Proteins in Human HealthProteins are essential macromolecules for human health, playing a vital role in the functioning of the human body. From hormones and enzymes to structural proteins and antibodies, proteins are the building blocks of life and are involved in a wide range of biological processes. In this essay, the importance of proteins in human health will be discussed, focusing on their four main functions:
hormonesenzymesstructural proteinsantibodies.Hormones are proteins that regulate various physiological processes in the body. Insulin, for example, is a hormone that is essential for glucose utilization in the human body. Without insulin, glucose cannot be metabolized and utilized properly, leading to serious health issues such as diabetes.
Enzymes are proteins that catalyze biochemical reactions in the body. Lipases, for example, are enzymes that hydrolyze lipids, which are essential for the digestion of food. Without lipases, the body would not be able to properly digest and absorb the essential nutrients from food.
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Predict the major product in the reaction shown below. AlCl3
Answers
To solve this, we must know each and every concept related to friedel-crafts alkylation reaction. Therefore, the correct option is option E among all the given options.
What is Friedel craft reaction?The Friedel-Crafts synthesis is just an aromatic chemical method in which an electrophilic substitution substitution takes place. The hydrogen in benzene is replaced by an electrophile in the vicinity of a Lewis acid, like anhydrous aluminium chloride.
Friedel-Crafts Alkylation is a chemical process in which the proton of an aromatic molecule is replaced with an alkyl. This reaction happens when there is anhydrous aluminum chloride. Anhydrous aluminium chloride can be replaced with other Lewis acids, like FeCl[tex]_3[/tex].
Therefore, the correct option is option E.
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What is the substrate process?
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A substrate in biology can be either a chemical that an enzyme can operate on or the surface that an organism (such as a plant, fungus, or animal) lives on. A substrate in geology is the surface of a rock or sediment where chemical and biological processes take place.
Geology describes it as the layer of rock or other elements that lies beneath the soil. For instance, a page is a substrate for ink to stick to, rock is a substrate for fungi, and NaCl is a substrate for a chemical reaction. The basic material on which processing is carried out is referred to as the substrate in the fields of materials science and engineering. This surface might be employed to create new films or material layers, like deposited coatings. It might serve as the foundation for the bonding of paint, adhesives, or sticky tape.
The substrate in biochemistry is a molecule that an enzyme reacts with. Chemical processes involving the substrate are catalyzed by enzymes (s). One or more products are created from the substrate, and they are then released from the active site. After that, another substrate molecule can be taken up by the active site.
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Why water is an ampotalic specie
Answers
The oxygen atom in the water molecule has two lone pairs, one of which could be used to form a bond with a proton and, therefore, the water molecule could act as a base in a reaction. Since water has the potential to act both as an acid and as a base, water is amphoteric.
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If you start out with a 136 gram sample of Plutonium that has a half life of 8, how much will be left after 32 days?
Answers
To solve this type of question we must know the concept of rate law. Therefore, 8.242g will be left after 32 days. The kinetic for the decay of Plutonium is of first order kinetics.
What is the expression for rate law for first order kinetics?There are two kinds of rate law in chemical kinetics one is differential rate law and other is integrated rate law.
The rate law for first order kinetics is
K=(2.303/T)×log(a/a-x)
half life=0.693/K
Where
k - rate constant
t - time passed by the sample
a - initial amount of the reactant
a-x - amount left after the decay process
K=0.693/half life
K=0.693/ 8
=0.086
0.086=(2.303/ 32)×log( 136/a-x)
0.086=0.07×log( 136/a-x)
1.22=log( 136/a-x)
136/a-x=16.5
a-x=8.242g
Therefore, 8.242g will be left after 32 days.
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For each item: classify organic or inorganic. NaCl: . phenol (C6H6;O): . C2H6: . Ca3(PO4)2: . formaldehyde (CH20): . MgCO3:
Answers
The correct classification of the following compounds are as follows:
NaCl: inorganic compoundPhenol (C₆H₆O): organic compoundC₂H₆: organic compoundCa₃(PO₄)₂: inorganic compoundFormaldehyde (CH₂0): organic compoundMgCO₃: inorganic compoundWhat are organic compound?Organic compound are any compound containing carbon atoms covalently bound to other atoms most commonly hydrogen, oxygen, or nitrogen.
Inorganic compounds are those not containing carbon atoms or containing carbon atoms ionically bound to other atoms.
However, not all carbon-containing compounds are organic. For example, carbon dioxide is an inorganic compound; although it has a carbon atom it has no C-C or C-H bonds.
Therefore, the classification of organic and inorganic compounds is as illustrated above.
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How many molecules of gold are in a gold ring that has a mass of 8.87 g
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We are aware that one Avogadro constant (N a=6.022*1023; Na =6.022*1023 ) equals one mole of any substance. Since MM=197 g/mol --> n= 8.87 g/197 g/mol 0.450*10-2 mol in this instance.
When given a mass, how do you calculate the number of molecules?Determine the substance's molecular weight in units of one mole, then divide the molar mass value by the molecular mass, and multiply the result by the Avogadro constant to get the required number of molecules.
What constituents of gold are there?Auric chloride (AuCl3) and chloroauric acid are the most prevalent gold compounds (HAuCl4). Aqua regia is a solution made by combining one component of nitric acid with three parts of hydrochloric acid (because it dissolved gold, the King of Metals).
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Using this equation: HONH2 + H2O ⇔ HONH3+ + OH− a) Identify the acid on the left and its conjugate base on the right b) Identify the base on the left and its conjugate acid on the right Please show how you arrived at answers thank you!
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a. The acid on the left is H₂O and its conjugate base on the right is OH⁻.
b. The base on the left is HONH₂ and its conjugate acid on the right is HONH₃⁺.
Chemical reactions between acids and bases always produce its conjugate base and its conjugate acid. According to Bronsted-Lowry
Acid on the left side of a chemical reaction always donates a proton (H⁺)Its conjugate base on the right side of a chemical reaction is the remaining acid after the acid is donated.Base on the left side of a chemical reaction always accepts a proton (H⁺)Its conjugate acid on the right side of a chemical reaction is the remaining base after the base accepts a proton.HONH₂ + H₂O ⇄ HONH₃⁺ + OH⁻
HONH₂ becomes HONH₃⁺HONH₂ accepts a proton, so HONH₂ is a base
HONH₃⁺ is a conjugate acidH₂O becomes OH⁻
H₂O donates a proton, so H₂O is an acid
OH⁻ is a conjugate base
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The conjugate acid of CH3COO- is _____________. The conjugate acid of F- is _______________. The conjugate acid of CN- is ______________. The conjugate acid of PO43- is _____________.The conjugate base of CH3COOH is _________________. The conjugate base of HCl is ______________. The conjugate base of H2SO4 is _________________. The conjugate base of H2S is _______________. The conjugate base of H3PO4 is _________________. The conjugate base of NH4+ is ___________________.Na2HPO4 is soluble and exists in two units of the cation Na+ and one unit of the anion __________________. The conjugate base of this anion is _____________________. Na3PO4 is soluble and exists in three units of the cation Na+ and one unit of the anion ___________________. The conjugate acid of this anion is __________________.
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So that is base. However, this base (CH 3COO) is actually a derivative of the acid (CH 3COOH), which is why CH 3COO is an acid's conjugate base. What distinguishes a conjugate base from an acid hbr?
H2CO3 is the conjugate acid. acid carbonate. What is CH3COO's conjugate acid? The conjugate acid for the acetate ion is acetic acid. What is the CH3COO- conjugate acid? What does the term conjugate base mean? An acid's conjugate base is what is left over after the acid has contributed its proton. Example: HX is the acid, and X- is the conjugate base. An acid's conjugate base is what is left over after the acid has contributed its proton. Acid is HX, while base is conjugate.
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