Setting has an impact on the narrative through influencing the growth and theme. It also has an impact on the narrative by drawing the reader in and assisting them in picturing the occasions and setting of the story.
What influence does chemistry have on our lives?Chemistry provides for all of our basic needs, including food, clothing, shelter, health, energy, and clean air, water, and soil. Chemical technologies provide new solutions to problems with hygiene, resources, especially energy usage, which enhance our quality of life in many ways.
What does the word "influence" mean?The term in current usage often refers to the capacity to influence someone or something, particularly the capacity to bring about changes without exerting direct pressure.
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calculate the volume in milliliters of a 1.47 mol/l sodium thiosulfate solution that contains 100. g of sodium thiosulfate
In this question, we are given with
mass of sodium thiosulfate = 100g
We know that, Molar mass of sodium thiosulfate = 158 g/mol
number of moles = Given mass/ Molar Mass
Number of moles of sodium thiosulfate = 100/158
Number of moles of sodium thiosulfate = 0.63 moles
We are given with molarity of solution,
Molarity of Solution = 1.47 M
We know that, Molarity = number of moles/Volume (in liters)
1.47 = 0.63/V
V = 0.63/1.47
Volume in liters = 0.430 L
(In ml)
Volume = 430 ml
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If 2 g of element x combines with 7 g of element y to form compound xy, how many grams of y are needed to form compound xy2? explain your reasoning.
If 2 g of element x combines with 7 g of element y to form compound xy, grams of y are needed to form compound xy₂ is 14g.
According to the given condition :
2g of x + 7g of y ----> xy
7g of y form xy where y = 1
let a g of y form xy₂ , where y = 2
therefore a = 2 × 7 g
a = 14 g
so y are needed to form xy₂ = 14g
According to conservation of mass neither be created nor be destroyed.
Thus, the grams of y are needed to form compound xy₂ is 14g.
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What are some factors that influence the effectiveness of a chemical sanitizer?.
The efficiency of chemical sanitizers depends on a number of variables. Volume, temperature, contact time, total alkalinity, and pH are among the most important.
What instances from chemistry?The substances, such as copper, nitrogen, and oxygen, as well as compounds comprised of components like alcohol, carbon dioxide, and salt, as well as more complicated materials, such as a computers, the air you breathe, precipitation, a chicken, a car, etc., are examples of chemicals.
What materials make up chemical?Chemicals are another name for matter, which is everything composed of atoms. Chemicals are the buildings you can create using atoms as the building pieces in a LEGO set. They could be solid, liquid, or gas in any form. Chemical can be a combination or a pure substance.
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which of the following molecules does not have a permanent dipole moment? a. hydrogen fluoride, hf b. nitrogen trifluoride, nf 3 c. iodine trichloride, icl 3 d. sulfur dioxide, so 2 e. carbon tetrachloride, ccl 4
As already mentioned, carbon tetrachloride lacks a sustained positive charge for ccl4 monomers.
What sets atoms distinct from molecules?Particles that exist alone and in isolation make up an atom. The neutral particles known as molecules are made up of more numerous two atoms joined together. A positively and negatively charged molecule is called an ion. The two categories of basic particles that comprise atoms are quarks and electrons. An region of electrons surrounds the nucleus of an atom.
Is gold a molecule or an atom?The nucleus of the gold atom has 79 protons. The number of protons and electrons in each neutral (charge-free) atom is the same. Although neutrons can vary, they are typically between 1.5 and two times as common as protons (in smaller atoms) (larger atoms).
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What are the two distinct pathways for nucleophilic aromatic substitution?
A) Addition-substitution and substitution-addition
B) Addition-elimination and elimination-addition
C) Addition-addition and elimination-elimination
D) Elimination-substitution and substitution-elimination
The two different pathways for nucleophilic aromatic substitution are addition-elimination and elimination-addition.
What are the two distinct pathways for nucleophilic aromatic substitution?The reactions are known as nucleophilic aromatic substitution reactions because they occur when a nucleophile attacks an aromatic ring before the leaving group leaves.The addition of a nucleophile to the aromatic ring takes place in the first phase of the addition-elimination process, which is the first possibility.In the second possibility, also known as the elimination-addition, the H atom is removed in the first step, resulting in an intermediate called benzyne. The benzyne is attacked by a nucleophile in the following step, resulting in a negatively charged intermediate ,that is later protonated to produce the end product.Thus, the two different pathways for nucleophilic aromatic substitution can be addition-elimination and elimination-addition.So, Option B is correct.To learn more about nucleophilic aromatic substitution , refer:
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Answer:
addition-elimination addition-addition
Explanation:
when a strong acid reacts with a strong base, typically the products formed are and an ionic compound, which is called a(n) .
The products formed are and an ionic compound, which is called a Salt.
What is ionic compound?
A chemical compound known as an ionic compound in chemistry is one that contains ions held together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions, or cations and anions, the compound is overall neutral. These can be either polyatomic species, like the ammonium (NH+ 4) and carbonate (CO2 3) ions in ammonium carbonate, or simple ions, like the sodium (Na+) as well as chloride (Cl) in sodium chloride. Since individual ions in an ionic compound typically have more than one nearest neighbour, they are not thought of as belonging to molecules but rather as components of an ongoing three-dimensional network. When solid, ionic compounds typically have crystalline structures.
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hydrogen gas can react with some halogen to produce hydrogen chloride. write a correct balanced reaction and identify the oxidizing agent.
H2 gas is the oxidizing agent in the equation H2(g) + Cl2(g) 2HCI(g), and the reducing agent is H2(g) + Cl2(g).
What occurs when chlorine and hydrogen gas interact?Chlorine (Cl2) gas and hydrogen (H2) gas can be combined directly to generate hydrogen chloride; the process is quick at temperatures above 250 °C (482 °F). Heat is released during the reaction, which is described by the equation H2 + Cl2 2HCl, and moisture seems to speed up the reaction.
How is hydrogen chloride gas produced?By combining chlorine and hydrogen, Cl 2 + H 2 2 HCl, hydrogen chloride is created. The installation is known as an HCl oven or HCl burner because the reaction is exothermic. Deionized water absorbs the hydrogen chloride gas that results, producing chemically pure hydrochloric acid.
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What does a sanitizer test kit measure pH or strength?.
Sanitizer kit is used to clean the surfaces from pathogens and infectants. These microbes are having an optimum pH to live and thus, pH of the sanitizer must to be tested to ensure its effectiveness against microbes.
What is pH?
pH of a substance is the measure of its H+ ions concentration. Mathematically it is the negative logarithm of H+ ion concentration. The pH of above 7 is basic and the pH below 7 is acidic.
Microbes have an optimum temperature and pH up to which they can survive. They cannot be survived at extreme conditions such as extreme cold or hot similar for the pH conditions.
Therefore, to kill the infectious agents sanitizers must be prepared in a suitable pH at which microbes cant survive. Thus, sanitizer test kit measure pH or strength before use to ensure its effectiveness.
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The local area network software called a __ server provides workstations with the authorization to access a particular printer, accepts and queues print jobs, prints cover sheets, and allows users access to the job queue for routine and administrative functions.
print
The local area network software called a print server gives workstations with the authorization in accessing a particular printer, accepts and queues print jobs, prints cover sheets, as well as allowing users access to the job queue for routine and administrative functions.
Printer server or print server is basically a server that serves as a connection for communication between printers and client computers in a network whether it be a local area network or a wide area network. Print server enables back and forth communication between printers and client computers or mobile devices allowing them to queue or delete print or scanning jobs. Print server connection may be set up via a wired or wireless network router.
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Draw an alkyl bromide with proper stereochemistry that can be used to synthesize the given alkene as the exclusive product via an E2 reaction. All chiral centers must have four bonds drawn. Does the alkyl bromide drawn give the provided alkene product via an E2 mechanism? Did you take stereochemistry and regiochemistry into account? Does every chiral center have all four bonds drawn
There is a cyclohexane with four methyl groups. Two of them are angled in the direction of the molecule with the darker bond. As a result, one of the bonds in the alkyl bromide's structure should contain bromine.
And this bromine should be facing the other way from the methyl groups, who should be facing toward for an E2 reaction to occur. This is so that an E2 reaction can take place when there is less steric interference in the molecule. An E2 reaction will require a lot more work to complete if the bromine is facing in the same direction as the methyl group. I will instead advocate for an E1 or a replacement product.
A cycloalkane, cyclohexane has the chemical formula C6H12. It is non-polar, cyclohexane. Colorless and combustible, cyclohexane has a characteristic detergent-like stench.
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why is it necessary to measure volumes carefeull when preparing teh acetic acid solution but not necessary to measure vbolumes too carefully when preparing the dilute naoh solution
The calculated molar mass will be too high.
What is volume?
A closed surface-enclosed three-dimensional space's physical quantity. As an illustration, consider the area or shape that a substance like a solid, liquid, gas, or plasma occupies. Additionally, the cubic meter, an SI-derived unit, is frequently used to express volume numerically.
What is acetic acid?
Acetic acid, which has the chemical formula CH3COOH, is also known as ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid. In water, vinegar contains 4-6% acetic acid.
When we add water it does not affect the reuse of titration, this it is not necessary to have exact reacting of the volume of dilute NaOH solution but it is necessary for acetic acid, since we are interested for number of moles of acid in the flash.
2, we need to know initial at volume of reading of brunette and not round it to a absolute value, since the error of the brunette reading should be of the range = I 0.07 √(initial)^2 +(final)^2
3, we want to know the moles of acetic acid, then adding water does not affect titration of acetic acid, since water is not acid.
4,Even in the presence of air bubble due to incompletely filled, burette, the acid will use the same amount of base it would normally use but the brunette will read higher than it should because of air bubble.
Hence the calculated molar mass will be too high.
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how can you use ir and nmr as tools to indicate a successful reaction? mention which stretch(es) you would see in the starting material, but not in the product, or vice versa. give approximate wavenumber ranges for the peaks.
IR and NMR as tools to indicate a successful reaction .stretch(es) would see in the starting material, but not in the product, or vice versa. wavenumber ranges for the peaks is vanillyl alcohol lacks the peak about the 1700 cm⁻¹. range 9.5 - 10 ppm.
In the IR and NMR: The vanillyl alcohol lacks the peak of 1700 cm⁻¹ from C double bond O . the range is 9.5 - 10 ppm. IR tells the functionality present in the given product or the reactant.
Thus, IR and NMR as tools to indicate a successful reaction .stretch(es) would see in the starting material, but not in the product, or vice versa. wavenumber ranges for the peaks is vanillyl alchol lacks the peak about the 1700 cm⁻¹.
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What should be done to a thermometer before using it to test a food temperature?.
Before measuring the temperature of a different food, the thermometer's probe must be cleaned and sanitized because it will be placed into food.
The probe of a thermometer can be cleaned and sanitized by following the steps listed below:
washing the probe in warm water with detergentsanitizing the probe according to your thermometer's needs (alcoholic swabs are frequently used)rinsing the sanitizer away, if necessary (refer to the sanitizer's instructions)allowing the probe to dry naturally or completely with a disposable towel.Hence, cleaned and sanitized thermometer prevent food spoiling due bacterial contamination.
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Place a check mark [√] next to the things that are expected to INCREASE the rate of an enzymatic reaction a. Add more enzyme [√] b. Add more substrate c. Adjust pH to optimal level [√] d. Add a non-competitive inhibitor e. Freezing
Adding more substrate, more enzyme and adjusting the pH to the optimal level will increase the rate of the enzymatic reaction.
When we increase the enzyme concentration, more and more substrate are reacted and hence the rate of the reaction is increased.
Also, when the substrate is present in a large amount the enzyme works more efficiently because it has more allosteric sites to binds to.
As the enzymes are pH as well as temperature specific, the activity of the enzyme highly depends on the pH value, so, adjusting the pH to optimal level and freezing will decrease the activity of the enzyme.
The addition of non-competitive inhibitor will also decrease the rate of reaction because it will decrease the number of active sites to bind for the enzyme,
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What happens if lithium loses an electron?.
Answer:
When lithium loses one electron. It completes duplet state.
consider the substitution reaction that takes place when (r)-3-bromo-3-methylhexane is treated with methanol.which of the following would be true?
The substitution reaction that takes place when (R)-3-bromo-3-methylhexane is treated with methanol. the following would be true is The reaction would take place with racemization.
The (R)-3-bromo-3-methylhexane is a type of tertiary alkyl halide. this reaction will undergoes substitution reaction , SN1 reaction mechanism. the reaction of (R)-3-bromo-3-methylhexane is treated with methanol leads to the formation racemic mixture of the 3 methylhaxane-3-ol. The nucleophilic substitution reaction the nucleophile group is substituted on the alkyl halide in place of the alkyl group.
Thus, The substitution reaction that takes place when (R)-3-bromo-3-methylhexane is treated with methanol. the following would be true is The reaction would take place with racemization.
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which of the statements is correct? please choose the correct answer from the following choices, and then select the submit answer button. answer choices nacl leaves the ascending limb of the loop of henle through active transport. nacl enters the ascending limb of the loop of henle through diffusion. water enters the descending limb of the loop of henle through osmosis. water leaves the descending limb of the loop of henle through active transport. nacl leaves the descending limb of the loop of henle through active transport, and water enters the ascending limb of the loop of henle through osmosis.
NaCl leaves the ascending limb and water leaves the descending limbs of the loop of henle through active transport. NaCl enters the ascending limb of the loop of henle through diffusion. Water enters the descending limb of the loop of henle through osmosis.
What is ascending limb?The ascending limb of the loop of Henle is a segment of the heterogenous loop of Henle downstream of the descending limb, after the sharp bend of the loop. This part of the renal tubule is divided into a thin and thick ascending limb; the thick portion is also known as the distal straight tubule, in contrast with the distal convoluted tubule downstream.
What is descending limb?The descending limb of loop of Henle is the portion of the renal tubule constituting the first part of the loop of Henle. Descending limb of loop of Henle. Scheme of renal tubule and its vascular supply.
What is osmosis?Osmosis, the spontaneous passage or diffusion of water or other solvents through a semipermeable membrane (one that blocks the passage of dissolved substances—i.e., solutes).
What is active transport?Active transport is the process of moving molecules across a cellular membrane through the use of cellular energy.
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What are 5 examples of mass media?.
Examples of mass media include published images, television and radio broadcast recordings, newspaper and the magazine articles, commercials, sheet music, and the music that has been recorded for the widespread circulation.
There are several levels at which the individuals or institutions were involved in the creation and dissemination of a given mass media product, depending on the product that has been asked in the question.
A magazine article that has a lot of the mediation between the author and the reader compared to that of a mass-produced source like a 'zine or a personal blog which is an editor, a copy editor, a publisher, an advertisers, a legal restrictions, etc.
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which of the following reaction energies is the least exothermic (but still an exothermic reaction)? group of answer choices -540 kj/mole -125 kj/mole not enough information given 125 kj/mole 540 kj/mole
The reaction which gives -125 kj /mole of energy is the least exothermic but still an exothermic reaction.
What is exothermic reaction?An exothermic reaction is a chemical reaction that releases energy in the form of heat or light. These reactions are the opposite of endothermic reactions and can be represented by the following chemical formula: reactant → product + energyAn exothermic reaction is one in which energy is released in the form of light or heat. Therefore, in exothermic reactions, energy is transferred to the environment instead of taking energy from the environment as in endothermic reactions. For exothermic reactions, the change in enthalpy (ΔH) is negative.Can learn more about exothermic reaction from: https://brainly.com/question/2924714
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In which one of the following is the best Lewis structure a resonance structure? (central atoms are bold)
A.
CO2
B.
ClO3-
C.
COCl2
D.
NO2+
E.
HCN
The one of the following is the best Lewis structure a resonance structure. (central atoms are bold) is ClO₃⁻.
The molecules which are described by the multiple structure by using the Lewis structure are called as the resonance structures. in the given options the best Lewis structure a resonance structure is ClO₃⁻. the central atom in this molecule is the chlorine Cl. in this Cl atoms form double bonds with two O atoms and a single bond with one oxygen atom. the single bonded O will carry a negative charge so. due to this there will three equally stable structures are possible.
Thus, The one of the following is the best Lewis structure a resonance structure. (central atoms are bold) is ClO₃⁻.
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What has the same value as 20 of 45?.
If you are using a calculator, simply enter 20÷100×450 which will give you 90 as the answer.
Answer: 20% of 40 is 8.
Given that the piece of wood is 50" long in total. Let us say the lengths of the two wood pieces are 'x' and 'y' if the wood is sawed into two pieces.
This implies that x + y = 50... (1)
If one piece is 5" longer than the other, write it as;
(2) (This means that wood of length y is 5" longer than wood of length x. We will substitute equation 2 into 1 to write the problem as an equation.
x + y = 50
x + (x+5) = 50
2x+5 = 50 (The required equation will be where x is the length of the shorter piece of wood.)
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How many electrons are needed for a full shell?.
There are eight electrons needed for a full shell.
Atoms are most stable and least reactive when their outermost electron shells are full. Most of the elements important in biology require 8 electrons to be stable in the outermost shell, a rule of thumb known as the octet rule. Their outermost shells can only hold 8 electrons, so there are only 8 elements in both periods.
The full valence shell is the most stable electronic configuration. Other groups of elements have partially filled valence shells and gain or lose electrons to achieve stable electronic configurations. Atoms can gain or lose electrons to achieve the most stable electronic configuration, the full valence shell. Other groups of elements have partially filled valence shells and gain or lose electrons to achieve stable electronic configurations.
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Nitramide, N2H2O2, decomposes slowly in aqueous solution. This decomposition is believed to occur according to the reaction mechanism above. The rate law for the decomposition of nitramide that is consistent with this mechanism is given by which of the following?(A) Rate = k [N2H2O2] (B) Rate = k [N2H2O2] [H+] (C) Rate = (k [N2H2O2]) / [H+](D) Rate = (k [N2H2O2]) / [N2HO2−] (E) Rate = k [N2H2O2] [OH−]
With a rate constant of 4.70*10-5 s-1, Nitramide breakdown in aqueous solution at 25 °C proceeds in the first order as NH2NO2(aq) + N2O(g) + H2O. (l).
What is the chemical composition of Nitramide?A molecule's arrangement of atoms and the chemical bonds that hold it together make up its chemical structure. The molecule of Nitramide contains a total of five bonds (s) There are three non-H bonds, two multiple bonds, and two double bonds (s).
What is the thermal decomposition of Nitramide empirical equation?It has been utilized to thermally break down Nitramide (H2N2O2) and hyponitrous acid (H2N2O2). (both of which have the empirical formula N2OH2O).
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Why is it better to allow the solvent front to move almost to the top of the paper strip or tlc plate rather than stopping it at the halfway point during development?
It will improve the accuracy of your Rf value measurement by allowing for better pigment separation.
What is Rf value?The Rf value of a compound is equal to the compound's distance traveled divided by the solvent front's distance traveled. The term derives from chromatography, which discovered that a given component always travels the same distance in a given solvent under the same conditions.The retention factor (Rf value) is significant in chromatography because it can be used to predict where a specific substance will be located on the chromatogram. This is due to the fact that the Rf value measures how far a specific substance traveled relative to the solvent front.The presence of a high retention factor indicates that there is a strong interaction between the compound of interest and the surface.To learn more about Rf value refer to :
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a chemist fills a reaction vessel with aluminum hydroxide solid, aluminum aqueous solution, and hydroxide aqueous solution at a temperature of . under these conditions, calculate the reaction free energy for the following chemical reaction: use the thermodynamic information in the aleks data tab. round your answer to the nearest kilojoule.
the closest kilojoule is 168.12 kJ for G°.
Gibbs Free Energy: What is it?
Gibbs Free Energy, at any moment, is defined as the system's enthalpy less the product of the reaction's entropy and temperature, or:
ΔG° = ΔH° - T.ΔS°
Internal heat that exists in the system is referred to as enthalpy. It is determined by:
H° is equal to H°product - H°reagent.
Enthalpy Formation is used Table:
ΔH°= [3*(-299.9)+(-524.7)] - (-1277) (-1277)
ΔH°= 62,6kJ
The level of disorder in a system is measured by entropy. It's located by:
S = Products - Reagents - S
Calculating:
ΔS°= (-321.7) + 3(-10.8)-0\sΔS°= (-354.1) (-354.1)
J
Therefore, Gibbs Free energy will be as follows: G = H - T.
ΔS°\sΔG° = 62600 - [298.(-354.1)]
ΔG° = 168121.8J
To the closest kJ, please:
ΔG° = 168.12 kJ
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While testing a sample of copper (II) sulfate at varying wavelengths, you come up with a curve like the one found below. You still need to determine the concentration of the sample.
Based on this absorption spectrum, at which wavelength should you run the standards?
Based on the absorption spectrum, at the wavelength you should run the standards at 450 nm.
When all of the copper has precipitated out of solution, the usual method is to conduct a visual check. Pure copper(II) sulfate is described as white. It is also known as anhydrous copper(II) sulfate because it does not contain any water. When water is present, a copper(II) sulfate sample turns blue. Free iron, which is typically transferred onto a part's surface during manufacture with steel components, is found using the copper sulfate test. Copper(II) ions in solution absorb red light from the spectrum. The light that emerges from the solution will contain all the colors except for red. We see a light blue color when these particular wavelengths are combined.
Note that the full question is:
While testing a sample of copper (II) sulfate at varying wavelengths, you come up with a curve like the one found below. You still need to determine the concentration of the sample.
Based on this absorption spectrum, at which wavelength should you run the standards?
a) 450 nm
b) 550 nm
c) 650 nm
d)750 nm
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when drawing the lewis structure of a molecule, start by determining the total number of available valence based on each element's choose... then, use the total number of electrons needed for each element to be stable, generally based on the octet rule, to determine the ionic charge by finding the difference between the number of needed and available electrons divided by two. next, identify the central atom, which is the element with the greatest electronegativity other than hydrogen. finally, arrange the number of bonds around the central atom to fulfill the stable number of electrons for each element.
When drawing the lewis structure of a molecule, start by determining the total number of available valence based on each element's electronic configuration.
Then, use the total number of electrons needed for each element to be stable, generally based on the octet rule, to determine the ionic charge by finding the difference between the number of needed and available electrons divided by two. next, identify the central atom, which is the element with the greatest electronegativity other than hydrogen. finally, arrange the number of bonds around the central atom to fulfill the stable number of electrons for each element. This question has blanks that are already filled in except the 1st one.
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What is the molar mass of ammonia gas?.
Ammonia gas has a molar mass of 17.031 g/mol.
How much ammonia causes harm to people?Ammonia has a 25 ppm recommended exposure limit (REL) from NIOSH, which is calculated as an average over an eight-hour workday. The Short Term Exposure Limit (STEL) should be 35 ppm for any 15-minute period during the day, according to NIOSH. Over any 15-minute period, no worker should be exposed to more than that amount.
What is cleaned with ammonia?Additionally, home filth or stains from vegetable or animal oils, such as cooking grease and wine stains, can be effectively removed with ammonia. Ammonia is frequently used in glass cleaning solutions because of how quickly it evaportates, which helps prevent streaks.
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the solvolysis of 2-bromo-3-methylbutane potentially can give several products, including both e1 and s n 1 products from both the unrearranged carbocation and the rearranged carbocation. part b indicate whether the products are from e1 or s n 1 reactions. drag the appropriate products to their respective bins.
SN1 interactions with allylic electrophiles, lamp fuel, and valuable component in skincare and cosmetics products.
What purposes do E1 reactions serve?It is common practice to convert saturated compounds (organic molecules with single carbon-carbon bonds) into unsaturated compounds using an elimination reaction (compounds which feature double or triple carbon-carbon bonds).
What circumstances are favorable for SN1 and E1 reactions?The required carbocation intermediate must typically be somewhat stable for an SN1 or E1 reaction to take place. Strong bases, particularly strong hindered bases (such tert-butoxide), promote elimination while strong nucleophiles, especially strong, favor replacement. Small groups on the carbon attached to halogen atom.
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for the following reaction, 5.42 grams of sodium iodide are mixed with excess chlorine gas. the reaction yields 1.76 grams of sodium chloride. chlorine (g) sodium iodide (s) sodium chloride (s) iodine (s) what is the theoretical yield of sodium chloride ? grams what is the percent yield of sodium chloride ? %
The sentence makes it clear that none of these are true.
What purpose does sodium iodide serve?Iodine shortage is treated or prevented using sodium iodide. Iodine is required by the body in proper development and growth. Potassium iodide may be required for people who need additional iodine or cannot acquire adequate copper from their normal diet. Your thyroid gland needs iodine to operate correctly.
Which class of medication is sodium iodide?A complement used in complete parenteral feeding is sodium iodide. A water-soluble ionic bond having a crystal lattice is sodium iodide. Iodine can be obtained from sodium iodide, which can be given as a supplement for complete parenteral nutrition but is most frequently utilized in
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