The atomic number given the symbol z is written as a left subscript while the mass number given the symbol a is written as a left superscript next to the atomic symbol.
The atomic number or atomic number of a chemical element is the number of electric charges in the nucleus. For normal atomic nuclei, this equals the number of protons or the number of protons found in the nucleus of each atom of that element. Chemical symbols are abbreviations used to denote elements or atoms of elements.
Element symbols are abbreviations of chemical names. For example, the symbol for hydrogen is H and magnesium is Mg. A chemical symbol is an abbreviation or short representation of the name of a chemical element, commonly assigned in relation to its Latin name. All natural elements have one or two-letter symbols. Some man-made elements have temporary three-letter symbols.
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How many grams of aluminum chloride could be produced from 34. 0 g of aluminum and 39. 0 g of chlorine gas?.
166.87 g of aluminum chloride are created when 34 g of aluminum and 39 g of chlorine gas are combined.
One mole of aluminum and three moles of chlorine combine to generate the ionic compound aluminum chloride.
Al + 3Cl → AlCl3
This reaction results in the formation of AlCl3 from one mole of Al and three moles of Cl. Here, Al serves as the limiting reactant. So the product's mass is solely dependent on Al.
Al has an atomic mass of 27 g/mol.
133.5 g/mol for AlCl3.
Al has a given mass of 34 g. Therefore, there are 1.25 moles instead of 34 moles because of the ratio of 27 to 34.
Thus, 1.25 moles of aluminum produce 1.25 moles of aluminum chloride from 1 mole of aluminum.
1.25 mole of AlCl3 weighs 1.25 mol and 133.5 g/mol = 166.87 g.
As a result, the reaction produced 166.87 g of AlCl3.
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a gas occupies 6.00 l at 2.00 atm pressure. at what pressure would the volume be 1.50 l if the temperature is held constant?
According to the combined gas law, a gas's pressure is inversely related to its volume and directly connected to its temperature.
What Happens When the Pressure & Temperature of a Fixed Sample of Gas Decreases?The equation known as the combined gas law connects a gas's pressure, temperature, and volume. You can forecast what will happen to a sample of gas based on this equation if you alter one of the variables. If temperature and pressure are both decreased simultaneously, the precise outcome won't be known until you know by how much each quantity was reduced.Lessening Pressure : The equation is simplified to Boyle's law if temperature remains constant. As a result, if you lower the pressure of a certain quantity of gas, its volume will rise. However, the temperature would also need to drop if you kept the volume same while lowering the pressure. Gay-Lussac's law describes the relationship between gases at a constant volume. According to Gay-Lussac's law, a gas's pressure and temperature are proportional to one another at constant volume.To Learn more about gas law refer to:
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What kind of protein is albumin?.
Albumin in a single chain protein and it is family of globular proteins.
What is Albumin ?
The most common protein in blood plasma is albumin. In order to help in the movement of hormones, vitamins, and enzymes throughout the body, it helps in maintaining blood in arteries and veins. The liver produces albumin, which enters the bloodstream quickly.
With a molecular weight of 66/5 kDa with 585 amino acids, albumin is a single-chain protein. It is a simple protein lacking prosthetic groups and a non-glycosylated polypeptide.
The most common albumins are the serum albumins, which belong to a family of globular proteins. In addition to being moderately soluble in concentrated salt solutions and being heat denaturable, all albumin family proteins are water-soluble.
Thus, we can state that, albumin is a single chain protein.
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How are allergic reactions best avoided Servsafe?.
Make suggestions for menu items free of the allergen. To make the order clear to the kitchen and service staff. To avoid cross-contact, deliver food in separate portions.
Handle any of the common allergens with caution, paying attention to what surfaces they have touched. To avoid coming into contact with other foods, wash your hands right away after handling allergen-containing foods and change gloves. Antihistamines. Since histamine causes many of the symptoms of an allergic reaction, antihistamines work by blocking its effects. You can buy a lot of antihistamines from your pharmacist without a prescription; stock up in case of emergency. It is best to use non-drowsy antihistamines. Food allergies have no known treatment, and the only way to prevent a reaction is to avoid the allergen. It helps to get rid of skin rashes, calms itching, and stops the skin from inflaming further.
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Is pewter safe for food?.
If pewter does not contain lead than it is safe to use for food.
Old pewter is made from tin and lead. Since there is no safe level for lead exposure, use of lead is not advisable. Even though we use it only occasionally, in a way that is still worse, for that the salt has contact with the pewter for a longer period, giving it more opportunity to absorb any lead that may be causing leaching.
Modern pewter is usually lead-free and also safe to use. It is made from 95% tin, plus copper and also antimony. So these kinds of pewter products are guaranteed lead-free and quite safe to be used for all kinds of food and drink as well. So we can use lead free pewter for drinks and food.
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in the bacterium e. coli, in the absence of lactose, a repressor protein binds to the operator region of the dna, preventing the transcription of the genes of the lac operon.
The lactose is an inducible, non-functional operon, which means that the genes are typically either translated or not.
What is lactose made of?Lactose is a naturally occurring sugar found within milk and other dairy products such yogurt and ice cream. It is produced when two additional sugar, glucose and galactose, combine. The body converts lactose into these two sugars using an enzyme called lactase so that it may be digested.
What are the 4 types of lactose intolerance?various forms of lactose intolerance The most prevalent form of lactose intolerance is primary, which develops as people age. secondary lactose intolerance (caused by disease or harm), Developmental lactose intolerance, or congenital lactose intolerance (having the condition from birth).
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Write the balanced net ionic equation for the precipitation of iron(II) sulfide from aqueous solution:
The net ionic equation of the reaction is; [tex]Fe^{2+} (aq) + S^{2-} (aq) ---- > FeS(s)[/tex]
What is net ionic equation?When we talk about the net ionic equation, we are talking about the equation that would show the ions that underwent a change in the reaction. These ions would differ from the spectator ions that did not undergo any change from left to write in the reaction.
In this case, we need to write to write the net reaction equation that would show the change that leads to the precipitation of the iron II sulfide as a solid from the solution.
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a 47.2-ml sample of naoh is titrated with 0.624 m hbr. 27.4 ml of the acid are required to reach the equivalence point. what is the molarity of the base? multiple choice question.
The molarity of the base would be 0.36 M.
Stoichiometric problemThe equation of the reaction when NaOH reacts with HBr in a neutralization reaction is written as:
[tex]NaOH + HBr --- > NaBr + H_2O[/tex]
The mole ratio of NaOH to HBr is 1:1.
Recall that: mole = molarity x volume
Also; molarity = mole/volume
Mole of 0.624 M, 27.4 mL HBr = 0.624 x 27.4/1000
= 0.017 mol
If the mole of HBr is 0.017 mol, the equivalent mole of NaOH will also be 0.017 mol.
0.017 mol of 47.2 mL (0.0472 L) NaOH would molarity of:
0.017/0.0472 = 0.36 M
In other words, the molarity of the NaOH is 0.36 M.
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47.2-ml sample of naoh is titrated with 0.624 m hbr. 27.4 ml of the acid are required to reach the equivalence point. what is the molarity of the base? multiple choice question.
A. 0.362 M
B. 0.0171 M
C. 0.0466 M
D. 1.07 M
Is BaO a nonpolar covalent bond?.
The BaO has ionic bonds.
Ionic bonds generally occur between metallic and non-metallic elements. Therefore, the bonds formed are ionic, since there is a bond between metals and non-metals. Therefore, BaO has ionic bonds. Covalently bonded molecules composed of only one type of atom, such as hydrogen gas, are non-polar because the hydrogen atoms share their electrons equally.
Barium oxide is an ionic compound with a high dipole moment because it forms opposite dipoles. Bao is therefore a polar compound. Barium oxide also known as a barrier is a white hygroscopic non-flammable compound with the chemical formula BaO. It has a cubic structure and is used in cathode-ray tubes crown glasses and catalytic converters.
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The mass of a carbon atom is 12. 00amu while the mass of a helium-4 atom is 4. 003amu. If three atoms of helium fuse to form carbon, how much mass is converted into energy?.
Small amounts of mass are changed into power from the breaking up fission or mixture fusion of the nuclei of atoms.
The potential or strength to do paintings, inclusive of the capacity to move an item through the utility of force. power can exist in a selection of bureaucracy, along with electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to some other.
In physics, electricity is the quantitative asset this is transferred to a frame or to a physical gadget, recognizable in the performance of labor and inside the shape of warmth and mild. electricity is a conserved amount the law of conservation of strength states that strength may be transformed in form, however now not created or destroyed.
Scientists define strength as the potential to do work. contemporary civilization is possible because human beings have found a way to exchange energy from one shape to other and then use it to do paintings.
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n a school lab, students are measuring the breathing rate of a lizard. They place it in a cold chamber and measure its breathing rate. Then, they place it in a hot chamber and measure its breathing rate again. The lizard is comfortable in both chambers. Will the breathing rate of the lizard change or remain the same in both chambers?
Since the lizard was comfortable in both chambers, the breathing rate of the lizard will remain the same in both chambers due to homeostasis.
What is homeostasis?Homeostasis is the process by which an organism maintains a fairly constant internal environment.
There are several mechanisms by which the body employs to maintain homeostasis.
For example, an increase in breathing rate in low oxygen concentration or a decrease in metabolic rate in high-temperature conditions.
The given lizard under study has been able to maintain homeostasis in both the hot and cold chambers.
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Answer: A
Explanation:
i do connexus
Does hydrogen want 2 valence electrons?.
Each hydrogen atom only requires one electron because the valence electrons of hydrogen can only fit a maximum of two into their orbital. Since each atom only has one valence electron.
A valence electron is an electron in an atom's outer shell that can take part in the production of a chemical bond if the outer shell is not closed. This concept is used in both chemistry and physics. One valence electron from each atom in the link is contributed to creating a shared pair in a single covalent bond.
The valence of an element—whether it can bind with other elements and, if so, how quickly and with how many other elements—may be determined by the existence of valence electrons. Thus, the electrical arrangement of an element has a significant impact on its reactivity. A valence electron can only reside in the outermost electron shell of a main-group element and a transition metal.
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suppose of potassium chloride is dissolved in of a aqueous solution of silver nitrate. calculate the final molarity of chloride anion in the solution. you can assume the volume of the solution doesn't change when the potassium chloride is dissolved in it. be sure your answer has the correct number of significant digits.
Potassium chloride is dissolved in an aqueous solution of silver nitrate. The final molarity of the chloride anion in the solution is 2.824 M.
Let's take 2.04 g of potassium chloride which is dissolved in 150 ml of a 0.20 M aqueous solution of silver nitrate.
The balanced equation of this problem is going to be -
KCL + AgNO₃ ⇒ KNO₃ + AgCL
Moles present in the KCL = 2.04 g
No. of moles = [tex]\frac{Mass}{Molar Mass}[/tex]
= [tex]\frac{2.04}{74.5513}[/tex]
= 0.02736 moles
Moles of Silver Nitrate = molarity × Volume in L
= 0.20 × 0.150
= 0.030 moles of silver nitrate
Therefore, silver nitrate is the limiting agent.
Now, we will calculate the moles of the chloride anion -
= 0.030 moles × [tex]\frac{1 mole potassium chloride}{2 moles of silver nitrate }[/tex]
= 0.015 moles of potassium chloride
Remaining moles = 0.02736 moles - 0.015 moles
= 0.01236 moles of potassium chloride
Or we can say 0.04236 moles of the chloride anion.
Now, we calculate the molarity = [tex]\frac{No. of moles}{Volume in L}[/tex]
= [tex]\frac{0.04236}{0.0150}[/tex]
= 2.824 M
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What is an example for archetype?.
An archetype seems to be a pattern that unites people from different historical periods and cultural backgrounds. Swiss psychotherapist Carl Jung is credited with creating the archetype.
What do scientific archetypes entail?An archetype is a formal, reusable representation of a domain notion in the field of informatics. The word "archetype" has historically been used in psychology to refer to an idealized representation of a person, personality, or behavior.
What exactly is an archetypal partnership?We all have a "operational style" when it comes to relationships. It depends on how individuals approach love, whether we communicate with one another, and how we behave with other people. Our personalities, temperaments, emotional histories, and experiences combine to form our styles, or archetypes.
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which compound(s) exhibit only london dispersion intermolecular forces? (select all that apply.) pf3 of2 n2 ch3ch2nh2 ch3ch2oh ch4
Because they are non-polar molecules, SF6 and PF5 compound(s) only show london dispersion intermolecular forces. The attractive and repulsive forces are referred to as intermolecular forces.
that develop in a substance's molecules. Individual molecules of a substance interact with one another through the mediation of these forces. Polarizability is the term used to describe a molecule's propensity to produce a charge separation or induced dipole. intermolecular forces have a strength of the interaction between two dipoles, indicated as, can be used to express it.
The non-polar molecules are those that do not have charges at the end because their electrons are evenly distributed throughout and those that symmetrically cancel one another. Is called non-polar molecules.
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The complete question is-
Which Compound(S) Exhibit Only London Dispersion Intermolecular Forces? (Select All That Apply.) OF2 CH3OH SF6 CH3CH2NH2 PF5 BrF3
What are the 4 Laws of radical?.
There cannot be no exponents in the radicand greater than the index. There can be no exponents in the radicand that share a factor with the index.
What does a square root's radicand mean?When writing a square root, the radical symbol is used, and the number of expression inside the radical symbol—which is below symbolized by the letter a—is known as the radicand. By using the sign (read as plus minus) in front of the root, we can specify that we want both the positive and also the negative square roots of a radicand.
What is the location of radicand?The number you're looking for the root of is the radicand, which may be found inside a radical sign. Depending on the subscript located outside and immediately before the radical symbol, it might be a sum of the squares, cube root, or another root.
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given the name of the molecule found in the process of dna replication. match the named molecule found in the dna replication process to its appropriate description. single stranded binding proteins (ssbps)
One of the crucial elements in DNA replication is the enzyme DNA polymerase. DNA polymerases build DNA by sequentially adding nucleotides to the lengthening DNA strand.
What is the name of the process that duplicates DNA?These strands are divided during the replication process. The semiconservative replication process creates the counterpart of each strand of the original DNA molecule by using it as a template.
What chemical brings about replication's conclusion?And last, DNA ligase, an enzyme? divides the DNA sequence into two strands that are continuous. Two DNA molecules made up of one new and one old chain of nucleotides are produced as a result of DNA replication.
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draw the lewis structure of hcn. include lone pairs.
The Lewis structure of the hydrogen cyanide molecule is represented by the image shown.
What is the Lewis structure?
We know that the Lewis structure is showing us the relationship between the electrons pairs in the compound and its overall properties. The Lewis structure consists of the symbol of the element and the electrons pairs that surround the atom.
We can see that in hydrogen cyanide there is a nitrogen atom and there is a hydrogn atom and also one carbon atom. The bond between carbon and nitrogen is covalent while the bond between hydrogen and the cyanide moiety is covalent.
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Particles are spaced the farthest apart in ____________ and the closest together in ____________. Select the answer that best completes the sentence.
Particles are spaced the farthest apart in gases and the closest together in solids.
Particles are furthest apart in gases. In gases, the particles are this point apart from each other and gases are fantastically clean to compress. Gases are fashioned from drinks thru evaporation or boiling. Debris in liquids is nearer than in gases but they're similar aside from in solids.
The states of depending wherein molecules are packed closest together is solids. Solids have an exact extent and form. even though the molecules are shifting on an atomic stage, there's no motion inside the macroscopic view of a strong. In general, solids are denser than liquids, which can be denser than gases. . The particles in the strong are touching with very little area among them.
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the total pressure of a sample is 0.925 atm, and the partial pressure of co2 in the sample is 0.302 atm. what is the mole fraction of co2 in the sample?
Considering the Dalton's partial pressure, the mole fraction of CO₂ in the sample is 0.326.
Dalton's partial pressureThe pressure exerted by a particular gas in a mixture is known as its partial pressure.
Dalton's partial pressure law can be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.
In a mixture of two or more gases, the partial pressure of gas A can be expressed as:
[tex]P_{A}[/tex]=[tex]x_{A}[/tex][tex]P_{T}[/tex]
Mole fraction of CO₂In this case, you know:
Total pressure [tex]P_{T}[/tex]= 0.925 atmParcial pressure of CO₂ [tex]P_{CO_{2} }[/tex]= 0.302 atmSo, the mole fraction of CO₂ in the sample is calculated as:
[tex]P_{CO_{2} }[/tex]=[tex]x_{CO_{2}}[/tex][tex]P_{T}[/tex]
0.302 atm= [tex]x_{CO_{2}}[/tex]0.925 atm
0.302 atm÷ 0.925 atm=[tex]x_{CO_{2}}[/tex]
0.326= [tex]x_{CO_{2}}[/tex]
Finally, the mole fraction of CO₂ is 0.326.
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Compare and Contrast dalton atomic. theory and Morden atomic theory.
Dalton says atoms of different factors differ in size and mass, while the cutting-edge theory says they range in common mass.
The subsequent postulates are proposed by John Dalton: All count number is manufactured from very tiny debris called atoms. Atoms are indivisible particles, which can't be created or destroyed in a chemical reaction. Atoms of a given detail are identical in mass and chemical houses.
The matter is made of indivisible debris referred to as atoms. The homes of all the atoms of a given detail are the same such as mass. this may additionally be said as all the atoms of detail have same mass at the same time as the atoms of various elements have exclusive loads.
This regulation explains that the sum of all partial pressures of gas in a combination should same as the barometric pressure. it is an especially essential calculation for oxygen to determine the pressure of gas pushing into the alveoli and consequently into the circulating blood.
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What is citation example?.
Some of the citation examples are : (Ashbourne, 2014), (Nasta and Stein, 2020)
Citation is how you let your readers know that you just utilized data from exterior sources in your work. It too depicts those sources and gives data that permits the reader to track them down. This data may well be the author’s title, the distribution date, or page numbers. Citing sources that back up your claim, something else known as your thesis statement, makes validity for you as a researcher. Citing sources guarantees that your reader or instructor can differentiate your unique thoughts from the thoughts in your sources and of other analysts in your subject area. Citations regularly can be found in two places: after a paper in a book index or reference list and inside the text. The last mentioned, some of the time called “in-text” citations, more often than not comprise some points of interest around the source, and are for the most part composed in the bracket after the sentence where you referenced the source.
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identify the reagents that can be used to achieve the following transformation: 1) conc,. h2so4, heat, 2) oso4
The reagents that can be used to achieve the following transformation conc [tex]H_{2}SO_{4}[/tex]
What functions do reagents serve in chemistry?A chemical reaction is employed to verify the detection of another substance and is referred to as a "substance or chemical that's also added to a system with the purpose to induce a chemical change or is introduced to verify whether a reaction has occurred or not."
Reagent products are what?Reagent Products are Licensed Products that are composed of reagents used to perform SBS. They do not include any kits, reagents, or components used for Sample Preparation, nor do they include any hardware or devices.
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A sample of helium gas is stored in a tank at 18 atm and 20°c. How do these conditions compare to the conditions of a gas at stp?.
A sample of helium gas is stored in a tank at 18 atm and 20°c. The conditions compare to the conditions of a gas at stp are higher pressure and higher temperature.
in stp condition temperature of 273.15 °K (0 °C, 32 °F) and an absolute pressure of exactly 105 Pa (100 kPa, 1 atm).
In the open air, helium exerts very little pressure. Diffusion through a plane wall can be thought of as being one-dimensional since D≥L. Quasi-steady diffusion occurs when pressure changes are slow enough to allow for the assumption of steady-state conditions for diffusion through fused silica at any given time. The density of stationary medium is constant.
Ideal gas behavior is displayed by helium.
PV=nRT
P∝ t
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Consider the sulfur trioxide (SO3) molecule. What is the central atom? Enter its chemical symbol. How many lone pairs are around the central atom?I What is the ideal angle between the sulfur-oxygen bonds? Compared to the ideal angle, you would expect the actual angle between the sulfur-oxygen bonds to be V (choose one) about the same bigger smaller
Sulfur is is the central atom in sulfur trioxide (SO3) molecule.
Sulfur (S), commonly known as sulfur and a nonmetallic chemical element in the oxygen group, is one of the most reactive elements (Group 16 [VIa] of the periodic table). Pure sulfur is an odorless, tasteless, brittle solid that is pale yellow in color, insoluble in water, and has a low electrical conductivity. Sulfides are produced when it interacts with a variety of nonmetallic elements as well as every metal, with the exception of gold and platinum. Millions of tons of sulfur are produced each year, mostly to make sulfuric acid, which is widely used in industry. Seawater contains 0.09 percent sulfate, which is a form of sulfur.
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Which element can combine to form ionic bonds?.
The majority of the time, ionic compounds are created between metal and nonmetal components.
An ionic substance can be recognized in what way?Generally speaking, ionic bonding can be seen in compounds where a metal bound to a quasi or a semi-metal. Molecular compounds are those that are made up entirely of non-metallic elements or semi-metals and non-metallic elements.
Does water have an ionic bond?The bond between two hydrogen atoms in a water molecule, which is ionic in nature but has a covalent bond because it is positioned on one side of the negatively charged oxygen atom, is formed by the two hydrogen atoms.
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an unknown gas contains 83% c and 17% h by mass. if effuses at 0.87 times the rate of co2 gas under the same conditions. what is the molecular formula of the unknown gas?
The molecular formula of the unknown gas is C4H10 is the gas.
Solution:
moles H = 17 / 1.008 = 16.9
moles of C = 83/12 =6.91
so ratio of H to C = 16.9/ 6.91 = 2.45
C H 2.5 to get whole numbers multiply by 2 C2H5 = empirical formula = molar mass = 29 g/mol
apply Graham's law to get the molar mass of the unknown gas
0.87 / 1= sq.rt ( 44/x)
x = 58 g/mol
58/29= 2
C4H10 is the gas
One mole is defined as the amount of substance containing as many units as there are atoms in 12 grams of carbon. This is 6.022 x 10-23, also known as Avogadro's number. Mole volume at STP can be used to convert moles to gas volumes and gas volumes to moles. Whenever you write a chemical formula, write all gases in molecular form.
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what is the nunber of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as co2
The number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO₂ is zero lone pair.
The atomic number of carbon is 6. the outermost valence electrons in the carbon is 4 . the atomic number of Oxygen is 8 and the outermost valence electrons are 6.
the CO₂ molecule is covalent compound. covalent compound are those which are formed by the sharing of the valence electrons. the central atom Carbon have two bonding electron pair , count each double bond as a single bond so the bond angle is 180° and the geometry is linear. the CO₂ contains zero lone pair.
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explain why the following reaction yields the hoffman product (least substituted alkene) and no zaitsev product at all, even though the base is not sterically hindered.
The following reaction yields the Hoffman product and no Zaitsev product at all, even though the base is not sterically hindered because it proceeds through the E2 mechanism.
The reaction is under through E2 mechanism. In the E2 mechanism, the base abstracts the proton that is opposite to the leaving group. Bromine is the leaving group in the above-mentioned molecule, having two neighboring hydrogen atoms. The hydrogen atom opposite the bromine atom can take part in the E2 reaction. and the hydrogen having the same side as bromine cannot take part in the reaction. So the reaction yields the Hoffman product and no Zaitsev product at all.
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Rank the following elements in order of decreasing atomic radius. Rank from largest to smallest radius. To rank items as equivalent, overlap them. O F B C Largest Smallest
B, C, O , F is the ranking of the elements in order of their decreasing atomic radius.
What is the atomic radius?
A chemical element's atomic radius, which is typically the average or typical distance between the nucleus's core and the outermost isolated electron.The atomic radius serves as a gauge for the size of an atom. There are numerous non-equivalent definitions of atomic radius since the border is not a clearly defined physical entity.The atomic radius of the given elements are:Atomic radius of Boron (B) = 85 pmAtomic radius of Carbon(C) = 70 pmAtomic radius of Oxygen(O) = 60 pmAtomic radius of Fluorine( F) = 50 pmSince the atomic radius decreases from left to right across a period, B, C, O , F is the ranking of the elements in order of their decreasing atomic radius.To learn more about atomic radius, refer:
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