Considering the definition of atomic mass, isotopes and atomic mass of an element, the isotopic mass of the least abundant isotope is 23.5526 u.
Definition of atomic massThe number of protons and neutrons determine the mass number of an element.
Definition of isotopeAn isotope is an atom that belongs to the same chemical element as another and has the same atomic number, but a different atomic mass. That is, isotopes have the same number of protons as normal atoms, but a different number of neutrons.
Definition of atomic massThe atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Isotopic mass of the least abundant isotopeIn this case, you know:
The element has an average atomic mass of 22.810 u.The most abundant isotope has a natural abundance of 75.806% and an isotopic mass of 22.573 u. Being the abundance of the two isotopes 100%, the least abundant isotope has an abundance of 100% - 75.806%= 24.194%Then, the isotopic mass of the least abundant isotope (mass) can be calculated as:
22.573 u×0.75806 + mass ×0.24194= 22.810 u
Solving:
22.573 u×0.75806 + mass ×0.24194= 22.810 u
mass ×0.24194= 22.810 u - 22.573 u×0.75806
mass= (22.810 u - 22.573 u×0.75806)÷ 0.24194
mass= 23.5526 u
Finally, the least abundant isotope has a mass of 23.5526 u.
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rank the compounds nh3, n2, c2h6, ncl3, h2 in terms of decreasing capillary action in a glass tube. select all that apply
The following is a ranking of compounds in terms of decreased capillary action in glass tubes:
NH3 < NCl3 < C₂H6 < N₂ < H₂.
A stiff material, such glass or plastic, is used to create a very thin tube known as a capillary tube. Capillary action, which causes the liquid samples to flow up into the tubes against gravity, is the mechanism by which the tubes are used to collect liquid samples.
Water adhesion to a vessel's walls causes the liquid near the liquid's margins to experience an upward push, which causes a meniscus to turn upward. The integrity of the surface is preserved by the surface tension. Capillary action occurs when the cohesive forces between the liquid molecules are stronger than the adhesion to the walls.
Capillary action is the term for the flow of liquids via narrow spaces. The cause of the problem is the molecular attraction between a liquid and the solid surfaces surrounding it.
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explain homeostasis and negative feedback loop in regards to temperature in a human with an example of walking from the hot summer heat outside to a cold air conditioned room inside
Answer:37°C (98.6°F).
Explanation:
What temperature does the following reaction become spontaneous?
Ni(Co)4 (l) --> Ni (s) + 4CO(g)
The reaction would be spontaneous at a low temperature .
What is an exothermic reaction?An exothermic reaction is a chemical reaction that releases energy in the form of heat, light, or sound to the surroundings. The energy released during the reaction decreases the total energy of the system, making the reaction spontaneous.
From the thermochemical equation, we can see that this reaction is exothermic thus the reaction can move in the forward direction when we lower the temperature as shown
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Which of the labeled atoms in the structure below are coplanar with the two carbons in the double bond? (Hint: make a model of the structure with your model kit.) 7 3 1 4 2 5 6
Atom 1,2,6 and 7 are coplanar with the two carbons in the double bond.
In the structure below, the two carbons in the double bond are labeled as 1 and 2. To determine which of the labeled atoms are coplanar with the two carbons in the double bond, it is necessary to examine the arrangement of the atoms in space.
The atoms that are coplanar with the two carbons in the double bond are likely to be the atoms bonded directly to the double-bonded carbons, such as atoms 3, 4, 5, and 6 in the structure. These atoms are all located in the same plane as the double-bonded carbons, as indicated by their shared electrons in the covalent bonds. Atom 7, on the other hand, is not coplanar with the double-bonded carbons because it is not directly bonded to either carbon.
It is worth noting that molecular structures can be represented in different ways, and the 2D representation in the structure above may not accurately depict the true 3D arrangement of the atoms. Nevertheless, the principle of determining coplanarity based on bonding relationships remains the same.
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Determine the best way to deal with each of the following items that may dangle into the way during lab work.
flowy sleeves ________
loose bracelets ________
long necklaces _________
long earrings ________
long hair ________
The best way to deal with each of the following items during lab work is as follows:
Flowy sleeves: Roll up or tuck in the sleeves to prevent them from interfering with lab equipment.
Loose bracelets: Remove the bracelets or tuck them under gloves to prevent them from getting caught on equipment.
Long necklaces: Remove the necklaces or tuck them under clothing to prevent them from getting caught on equipment.
Long earrings: Remove the earrings or tuck them under clothing to prevent them from getting caught on equipment.
Long hair: Tie hair back or wear a hairnet to prevent hair from getting caught on equipment.
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Latoya measured 60 mL of vinegar into a bottle she measured 5 g of baking soda into a balloon. She placed a balloon over the top of the bottle. It shook the baking soda into the vinegar. She repeated the steps adding 10,15 and 20 g of baking soda she put her observations in the table, which conclusion is supported by her data.
In all the cases, a homogeneous solution is formed. Solubility is the measure of a solute's ability to dissolve in a solvent.
What is solution?A solute plus a solvent make up a solution. The thing that dissolves in the solvent is called the solute. Solubility is the measure of a solute's ability to dissolve in a solvent.
Latoya measured 60 mL of vinegar into a bottle she measured 5 g of baking soda into a balloon. She placed a balloon over the top of the bottle. It shook the baking soda into the vinegar. She repeated the steps adding 10,15 and 20 g of baking soda. In all the cases, a homogeneous solution is formed.
Therefore, in all the cases, a homogeneous solution is formed.
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for the electrochemical cell with the reactions pb 2e how would you write the reactions to make the battery provide a positive net potential
In an electrochemical cell, the net potential of the battery is determined by the difference in standard potentials between the two half-reactions.
To make the battery provide a positive net potential, the half-reaction with the higher standard potential must be made the oxidation half-reaction and the half-reaction with the lower standard potential must be made the reduction half-reaction. In the case of the reaction given, [tex]Pb + 2e^{-}[/tex] → [tex]Pb^{2+}[/tex], the standard potential of the half-reaction [tex]Pb^{2+}[/tex] → [tex]Pb + 2e^{-}[/tex] is negative, while the standard potential of the half-reaction [tex]Pb + 2e^{-}[/tex] → [tex]Pb^{2+}[/tex] is positive. This means that in order to make the battery provide a positive net potential, the half-reaction [tex]Pb + 2e^{-}[/tex] → [tex]Pb^{2+}[/tex] must be the oxidation half-reaction and the half-reaction [tex]Pb^{2+}[/tex] → [tex]Pb + 2e^{-}[/tex] must be the reduction half-reaction.
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Complete question:
For the electrochemical cell with the reactions Pb + 2e-, how would you write the reactions to make the battery provide a positive net potential?
which of the following mass spectra indicate the presence of chlorine in the compound being analyzed?
Because the isotopic abundance of M+(35Cl) and M+2(37Cl) in mass spectra is roughly 75 and 25%, respectively, this indicates chlorine is present. The intensity ratio of M+ and M+2 is approximately 3:1.
What in a mass spectrum signifies the presence of chlorine?Equally sized ion peaks at 79 and 81 amu are then produced as a result of Br2 fragmentation into a bromine cation. By observing the intensity ratios of ions that differ by 2 amu, it is simple to determine if a molecule or ion contains chlorine or bromine.
What kinds of substances may be analyzed using mass spectrometry?Many analytical issues are resolved with mass spectrometers, from determining the molecular weight and elemental composition to characterizing the structures of complicated bio-organic compounds (11, 12).
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an acid can be defined as a substance that loses one or more h ions when dissolved in water. an h ion is a hydrogen atom that has lost a(n) and is therefore just a(n) . the h ion is not an isolated ion, but interacts strongly with h2o to produce the ion, which has the formula h3o .
When a substance is dissolved in water, one or maybe more H+ ions are lost, and this is what is meant by an acid. A hydrogen atom with no further protons left is known as an H+ ion.
The hydrogen atom: what is it?The hydrogen atom serves as a symbol for the most fundamental of all atoms because it just has single proton one and electron. In addition to this most common isotope, the hydrogen atom can also be found in protium, deuterium, and tritium.
What is the Hydrogen is either H or H2?H2 is the molecular formula for hydrogen, with a molar mass of 1. The atomic number one element hydrogen, abbreviated H, is the lightest. The gas has the chemical formula H2, and it is tasteless, colorless, and extremely combustible.
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67. based on their positions in the periodic table, predict which has the smallest atomic radius: mg, sr, si, cl, i.
The atomic radius is defined as the distance from the nucleus of an atom to the outermost shell of electrons.
It decreases as we move from left to right across a period and increases as we move down a group in the periodic table. In general, elements with more protons and electrons will have a smaller atomic radius due to the increased positive charge of the nucleus, which pulls the electrons closer. In the case of Mg (magnesium), Sr (strontium), Si (silicon), Cl (chlorine), and I (iodine), iodine has the smallest atomic radius due to the increased number of electrons, making it the farthest right element in the period and highest in the group.
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The temperature of the two frames is reported to be either 80°C or 135°C. What is the temperature of the right (products) based upon the observations?
°C
Based on the observations, the temperature of the right (products) is less than the temperature of the left (reactants).
What is the relationship between temperature and the physical state of a substance?The relationship between temperature and the physical state of a substance is that an increase in the temperature of a substance results in more randomness of the particles of the substance while a decrease in temperature will result in more orderliness of the particles of a substance.
The energy that is given during a change in the state of matter is used to alter the binding energies rather than boost the kinetic energy of the molecules. As a result, the temperature doesn't change.
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what is the name of this faulty
an alcohol with the molecular formula c4h10o exhibits the following 13c nmr spectra. which statement below is the correct interpretation of the peaks in these spectra?
A CH2 group is present in alcohol the signal at around 69 parts per million; a CH group is present at about 30 parts per million; and a CH3 group is present at about 19 parts per million.
On its 13C NMR spectrum, how many signals would you anticipate to see?3 indications! Pentane has a mirror plane running directly through the centre, just like in the ethane illustration. Pentane has three different sorts of carbon atoms, which are visible if we rotate the molecule 180 degrees at a time.
What substance has a 13C NMR spectra with five signals?Only one substance, 2-pentanol, provides five indications based on the observed structures. Therefore, a. 2-pentanol is the recommended solution.
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Please help me with this
Basically the concave mirror will change it because of the curved look same thing with convex
The density of 1 cm3
of water is 1g/cm3
. What is the density of 200 cm3
of pure water?
A student has 25 cubic centimeters of three liquids: blue water(density 1g/cm3
), olive oil (density 0.85 g/cm3
) and corn syrup (density 1.4 g/cm3
). She carefully pours them into a single graduated cylinder. Please predict what will happen.
Responses
Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
Olive Oil on top, water in middle, and corn syrup on bottom because syrup is most dense.
Olive Oil on top, water in middle, and corn syrup on bottom because syrup is most dense.
It is not possible to predict.
It is not possible to predict.
Skip to navigation
Responses
Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
Corn
A student has 25 cubic centimeters of three liquids: blue water(density 1g/cm3
), olive oil (density 0.85 g/cm3
) and corn syrup (density 1.4 g/cm3
). She carefully pours them into a single graduated cylinder. Please predict what will happen.
Responses
Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
Olive Oil on top, water in middle, and corn syrup on bottom because syrup is most dense.
Olive Oil on top, water in middle, and corn syrup on bottom because syrup is most dense.
It is not possible to predict.
It is not possible to predict.
Skip to navigation
A student has 25 cubic centimeters of three liquids: blue water(density 1g/cm3
), olive oil (density 0.85 g/cm3
) and corn syrup (density 1.4 g/cm3
). She carefully pours them into a single graduated cylinder. Please predict what will happen.
Responses
Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
Olive Oil on top, water in middle, and corn syrup on bottom because syrup is most dense.
Olive Oil on top, water in middle, and corn syrup on bottom because syrup is most dense.
It is not possible to predict.
It is not possible to predict.
Skip to navigation
A student has 25 cubic centimeters of three liquids: blue water(density 1g/cm3
, olive oil (density 0.85 g/cm3 and corn syrup (density 1.4 g/cm3
She carefully pours them into a single graduated cylinder. Please predict what will happen.
A Corn syrup on top, water in middle, and olive oil on bottom because oil is most dense.
B Olive Oil on top, water in middle, and corn syrup on bottom because syrup is most dense.
C It is not possible to predict.
The density of 200 cm^3 of pure water is 200 g / 200 cm^3 = 1 g/cm^3, and is the same as the density of 1 cm^3 of water.
b. A Corn syrup on top, water in middle, and olive oil on bottom because corn syrup has the highest density of 1.4 g/cm^3, followed by water with a density of 1 g/cm^3, and olive oil with a density of 0.85 g/cm^3.
So option A is correct.
What is density?Density is described as the substance's mass per unit of volume.
We were able to determine which substance will stay in its relative position using Archimedes' principle which states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.
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review the safety data sheet (sds) (click the sds icon below) for hydrogen peroxide, then identify the best course of action for each type of chemical exposure. - If inhaled: move person to fresh air. - In case of eye contact: rinse w water for 15 mins. - If swallowed: rinse mouth w water. - In case of skin contact: take off any contaminated clothing & rinse thoroughly.
For hydrogen peroxide, the best course of action for each type of chemical exposure is as follows:
If inhaledIn case of eye contactIf swallowedIn case of skin contactExplanation of each of the types of chemical exposure to hydrogen peroxide:
If inhaled: Move the person to an area with fresh air, and seek medical attention if necessary.In case of eye contact: Rinse the eyes with water for at least 15 minutes and seek medical attention if necessary.If swallowed: Rinse the mouth with water and seek medical attention immediately.In case of skin contact: Remove any contaminated clothing and rinse the affected area thoroughly with water. Seek medical attention if necessary.Learn more about data sheet
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the element of art that interacts with the other elements to define them. the area in which the other elements exist.
The element of art known as composition interacts with the other elements to define them.
The composition is the area where the other elements are located and may be combined, planned, and organised to create a work of art.To create an appealing image, it includes relating elements like line, shape, colour, texture, and value to one another.Simply defined, composition implies "assembling." It might be characterised as the arrangement of an artwork's elements in line with its rules. A composition might be any intentionally put-together artistic endeavour, such as music, writing, or photography.Page layout and composition are terms that are widely used in desktop publishing and print media graphic design.
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All matter on Earth can be categorized into subsystems called _________.
a
Biomes
b
Ecosystems
c
Spheres
d
Circles
Answer: B. Ecosystems
Explanation:
Write the name for the product from the hydrogenation of each of the following Part A 1-hexene Spell out the full name of the compound. Submit Previous Answers Request Answer X incorrect; Try Again Part B 2-methyl-2-butene Spell out the full name of the compound. Submit Request Answer Part C 3-ethylcyclopentene Spell out the full name of the compound. Submit Request Answer
Because the double bond located at carbon 2 is decreased, 2-pentene will become pentane if it experiences a hydrogenation process.
What results from pentene's hydrogenation?When a hydrogen molecule is added across the double bond of trans-2-pentene, it is said to be hydrogenated, producing pentane, or CH3CH2CH2CH2CH3. Hydrogenolysis, which can happen to carbon-carbon and carbon-heteroatom (oxygen, nitrogen, or halogen) bonds, is a reaction in which bonds are broken while hydrogen is added.
In a hydrogenation reaction, what is the end result?Processes like hydrogenation are an illustration of an alkene addition reaction. An alkene undergoes a hydrogenation reaction, which produces a saturated alkane by adding two hydrogen atoms across the double bond.
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rewrite the expression 1 dime 2 nickels into an equivalent expression with the specified common noun and find the sum.
a. Using only nickels:
The expression can be rewritten as "10 x 2 nickels", where "nickel" is the common noun.
The sum is 10 x 2 nickels = 20 nickels.
b. Using dimes:
The expression can be rewritten as "1 dime + 2 x 5 dimes", where "dime" is the common noun.
The sum is 1 dime + 2 x 5 dimes = 1 dime + 10 dimes = 11 dimes.
c. Using cents:
The expression can be rewritten as "10 cents + 2 x 5 cents", where "cent" is the common noun.
The sum is 10 cents + 2 x 5 cents = 10 cents + 10 cents = 20 cents.
Did you mean, Rewrite the expression 1 dime 2 nickels into an equivalent expression with the specified common noun and find the sum? a. Using only nickels: b. Using dimes: c. Using cents
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convert 7.8845 in/sec to ft/min
1 inch per second (in/s) = 5 foot per minute (ft/min). 7.8845 in/sec is equal to 39.4225 ft/min.
What is unit conversion ?
A unit conversion is the expression of the same property in a different unit of measurement. Time, for example, can be expressed in minutes rather than hours, and distance can be converted from miles to kilometers, feet, or any other length measurement.
We must convert one unit to another in order to achieve accuracy and avoid measurement confusion.
Thus, 1 inch per second (in/s) = 5 foot per minute (ft/min). 7.8845 in/sec is equal to 39.4225 ft/min.
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which statement correctly identifies how a lipid-soluble hormone that diffuses from the blood and through the interstitial fluid identifies which cells in the tissue to act upon
Answer:
Explanation:
the presence of a receptor located in the cytoplasm or nucleus specific to the hormone in cells
The statement correctly identify a lipid-soluble hormone that diffuses from the blood and through the interstitial fluid, the cells in the tissue to act upon are steroids are hormones that dissolve in fat and diffuse through the cell membrane into the cell.
Diffusion is the movement of substances with or without crossing the cell membrane from an area of high concentration to an area of low concentration. Diffusion is a type of passive transport because it does not require energy that occurs due to differences in concentration.
Endocrine glands consist of secretory cells that secrete hormones into the interstitial space which are then absorbed into the surrounding blood vessels. Steroids and thyroid hormones are hormones that are soluble in lipid. The hormone will diffuse from the blood through the interstitial fluid through the lipid bilayer of the cell membrane into the cell. The hormone will bind to receptors in the cytoplasm or nucleus to form an active hormone-receptor complex. Thus affecting the DNA (gene acceptor), stimulate or synthesis of specific proteins or enzymes.
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FILL IN THE BLANK. __ is the strength of attraction holding atomic nuclei in an ionic bond is much stronger than in covalent bonds
Solution: Intermolecular force is the strength of attraction holding atomic nuclei in an ionic bond is much stronger than in covalent bonds.
Ionic bonds are stronger bonds as compared to the covalent bonds because ionic bonds are made between positive and negatively charged ions. Ionic bond are held by stronger intermolecular force of attraction between opposite ions. Covalent bond are formed between the same type of atoms having minimum electronegativity difference. Because of higher attraction forces between ions the ionic bonds are stronger and ionic compound have higher boiling points and are solid.
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during a baseball game the sound of the bat hitting the ball
During a baseball game, the sound of the bat hitting the ball can be heard in most parts of the stadium. That sound is weaker at greater distances. The cause of this phenomenon is inverse-square law.
What is sound?Sound is a physical disturbance from an equilibrium condition that travels via an elastoplastic medium. A completely subjective definition of sound, as perceived by the ear, is also viable, but it is not especially informative and is overly limited, because it is important to speak of noises which can be heard by the auditory system, such as those produced by dog whistles or sonar technology.
The inverse-square law, that states that the strength of a sound wave is inversely related to the square of the distance to the source, is the cause of this phenomena. The strength of such sound wave reduces as the distance to the source rises.
Therefore, the cause of this phenomenon is inverse-square law.
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What conclusions can you draw about how resource availability affects populations of organisms in an ecosystem?
Resource availability is the single factor that controls the number of teh species in the ecosystem.
What is the resource availability?The availability of resources in an ecosystem can have significant effects on the populations of organisms within it. When resources are abundant, populations can grow and thrive, leading to higher population densities and increased competition for those resources.
On the other hand, when resources become limited, populations may decline and struggle to survive, leading to decreased population densities and increased competition for remaining resources. In extreme cases, resource limitation can result in extinction of populations or even entire species. Therefore, resource availability is a key factor that shapes the structure and dynamics of ecosystems and the populations that inhabit them.
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which of the following bases can remove a proton from acetic acid in a reaction that favors products? check all that apply.
CH3NH2 and CH³O- will remove a proton from acetic acid.
What is Acetic AcidAcetic acid (chemical formula: CH3COOH), also known as ethanoic acid, is the second simplest carboxylic acid. It is a colorless liquid with a characteristic vinegar smell and taste. In its purest form, acetic acid is called glacial acetic acid.
What is Acetic Acid used forExcluding water, acetic acid is the main ingredient in white vinegar, containing between 3-9% acetic acid. Tamarind is also used as a food additive (E260), for flavor and as a regulator of acidity.
Acetic acid is also used in the manufacture of plastics, rubber, pharmaceuticals, dyes, insecticides, solvents, household cleaning products, textile printing and photographic chemicals.
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which of the following properties of proteins is typically not used as a basis for protein separation and purification?
The shape of a protein is typically not used as a basis for protein separation and purification.
Other properties such as size, charge, and binding properties are commonly used for protein purification. For example, cation-exchange chromatography uses the charge of proteins to separate them, and affinity purification involves binding proteins to specific molecules or ligands. Additionally, electrophoresis and 2D-PAGE are commonly used for protein separation and purification.
Proteins are large, complex molecules made up of amino acids that carry out a variety of functions in the body. They act as enzymes, hormones, antibodies, and structural components, and are essential for all living organisms. Proteins are composed of long chains of amino acids, and each protein has its own unique sequence of amino acids.
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You construct a device to transmit sound that is made of two cans and a string. What part of the device do sound waves travel on?
A. the can held by the listener
B. the string
C. the can held by the speaker
D. both cans
You construct a device to transmit sound that is made of two cans and a string. The string of the device do sound waves travel on. Therefore, option B is correct.
Where do the sound waves travel in the string telephone?A string telephone functions similarly to a landline phone. When you speak into the cup, sound waves are sent inside the cup, vibrating the bottom. The vibrations are transferred to the string, across the string and into the bottom of the other cup.
Sound waves travel along the string to the can's bottom, which acts as a diaphragm. The diaphragm vibrates, sending sound waves through the air to the ear.
Thus, option B is correct.
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draw a non-enzymatic mechanism to describe the formation of the imine between retinal and lysine. for simplicity, use r-nh2 to represent lysine.
The non-enzymatic mechanism to describe the formation of the imine between retinal and lysine. Most of the common amino acids have the general formula RCH(NH₂)COOH.
We call the R groups the side-chains.
They account for the properties of the different amino acids, and we classify the amino acids according to the nature of the side chains.1. Leucine
Leucine actually contains a four-carbon sidechain which makes— an isobutyl group.
Alkyl groups are always nonpolar and hydrophobic. leucine is actually a hydrophobic amino acid.
2. Lysine
Lysine always contains four carbon atoms and an NH₂ group.
Amino groups are basic, so lysine is a basic amino acid.
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for each atom in its ground state, determine the number of electrons in each energy shell. if there are no electrons in an energy shell, enter a 0 for that shell.
Electrons in energy shell 1 2 2 2 2, Electrons in energy shell 2 4 8 8 8, Electrons in energy shell 3 blank blank 3 8, Electrons in energy shell 4 blank, blank blank 2.
How can you determine how many electrons are present in each shell?Only a specific number of electrons can fit in each shell: the first shell can hold up to two, the second shell up to eight (2 + 6) electrons, the third shell up to 18 (2 + 6 + 10) electrons, and so on. The nth shell can theoretically accommodate up to 2(n2) electrons, according to the general formula.
How can you determine how many electrons are present at each energy level?The formula for an energy level's maximum number of electrons is 2 (n2). The energy level's fundamental quantum number, n, is present here. As a result, the first orbit has 2(12)=2 electrons, the second orbit has 8 electrons, and so on.
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Question:
For the following atoms in their ground state, determine theb number of electrons in each energy shell. If there are no electrons in the particular energy shell, leave that answer box blank.
Total Electrons in the atom
6
10
13
20