Answer:
21
Explanation:
........................
Answer: 21
Explanation:
What functional group is found in an aldehyde?
O A. Carbonyl
OB. Hydroxyl
O C. Ester
O D. Amino
Answer:
The answer is A. Carbonyl.
Carbonyl functional group is found in an aldehyde. Therefore, option (A) is correct.
What are the functions of carbonyl groups?A functional group with the formula C=O that is composed of a carbon atom double-bonded to an oxygen atom and is divalent at the C atom is known as a carbonyl group in organic chemistry.
The function of the carbonyl group is to break up the bonds in the carbon chain. The electronegative oxygen molecule will in general draw in additional electrons than the carbon it is attached to inside the carbonyl gathering.
There are many aromatic carbonyl compounds. Substances which incorporate carbonyls incorporate the compound answerable for the smell of vanilla and cinnamon.
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Write a balanced chemical equation to represent the following chemical reaction.
potassium iodide + lead(II) nitrate âLead(II) iodide + potassium nitrate
Answer:
KI + Pb(NO3)2 -> PbI2 + KNO3
Explanation:
The balanced chemical equation for the reaction of potassium iodide with lead(II) nitrate to form lead(II) iodide and potassium nitrate is:
KI + Pb(NO3)2 -> PbI2 + KNO3
In this equation, the coefficients in front of the compounds indicate the number of moles of each substance that are needed to balance the equation. This means that there are equal numbers of atoms of each element on both sides of the equation.
what molecule is most consistent with the following? what molecule is most consistent with the following? i ii iii iv v
The molecule in question is C12H22O2. This can be determined by using the information provided about the number of carbon, hydrogen, and oxygen atoms present in the molecule.
The chemical formula for the molecule is determined by listing the elements present in the molecule and their respective number of atoms.
The chemical formula for this molecule is C12H22O2. Using this information, it is possible to determine that the molecule is composed of 12 carbon atoms, 22 hydrogen atoms, and 2 oxygen atoms. The molecule with this chemical formula is known as "dodecanoic acid" and it is a straight-chain carboxylic acid.
It is also known as Lauric acid, which is found in many natural fats and oils and is a common ingredient in soaps and cosmetics. It is a white, waxy solid with a faint, characteristic odor. It is used in the manufacture of a wide variety of products, such as soaps, lubricants, and surfactants.
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The complete question is:
What is the chemical formula and structure of the molecule that is composed of 12 carbon atoms, 22 hydrogen atoms, and 2 oxygen atoms?
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An experiment at Sandia National Labs in New Mexico is performed at 758.7 mm Hg. What is this pressure in atm?
40 points
Answer:
0.9997 atm.
Explanation:
To convert pressure from millimeters of mercury (mm Hg) to atmospheres (atm), you can use the conversion factor 1 atm = 760 mm Hg.
To convert 758.7 mm Hg to atm, you can divide the pressure in mm Hg by 760:
758.7 mm Hg / 760 mm Hg/atm = 0.9997 atm
So the pressure in atm is approximately 0.9997 atm.
According to the unit conversion of pressure, the pressure in atmospheres is 0.998 atmospheres.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
As 1 atmosphere= 760 mm Hg , thus, 758.7 ×1/760=0.998 atmospheres.
Thus, the pressure in atmospheres is 0.998 atmospheres.
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part a - comparing chromosome separation in bacteria and eukaryotes in all cells, separation of replicated chromosomes is a prerequisite for cell division. however, the mechanism of chromosome separation in bacteria is distinct from that in eukaryotes in several ways. sort the following statements into the appropriate bin.
Chromosome separation in bacteria starts just at DNA replication start site. Chromosomes that have been doubled before eukaryotes are divided condense.
Why do chemicals separate?Heating or electrical energy can be used to break down compounds. The energy disrupts the bonds that hold the atoms together and initiates a chemical reaction. The compound can split into two simple compounds or be broken into separate atoms when the bonds break down.
Why is it vital to separate?We must separate mixes for the reasons listed below: To remove the unnecessary components from a combination, various components of the mixture are separated. to take important components out of a combination in more than one place. to acquire pure materials.
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a survey in which anonymous respondents, without fear of disclosure or arrest, are asked to report confidentially any violations of the criminal law they have committed
A survey in which anonymous respondents, without fear of disclosure or arrest, are asked to report confidentially any violations of the criminal law they have committed is referred to as self-report survey.
Since participants are assured of their anonymity and confidentiality, they are more likely to accurately record any prior criminal behavior without worrying about facing repercussions. However, This type of poll is known as a self-report survey. It's a method for gathering data about criminal or abnormal behavior that's employed in criminology and social science research. The validity of self-report questionnaires can be affected by under- and over-reporting, social desirability bias, and memory issues. It is crucial for researchers to be aware of these restrictions and make the appropriate measures to lessen their impact on survey results. This type of poll is known as a self-report survey. It's a method for gathering data about criminal or abnormal behavior that's employed in criminology and social science research.
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The actual question is:
A survey in which anonymous respondents, without fear of disclosure or arrest, are asked to report confidentially any violations of the criminal law they have committed is referred to as _______________.
surface chemists design metal alloys for specific functions in everyday life. which of the following does not demonstrate a benefit of using an alloy? A. Goldd is mixed with copper or silver to make a less expensive form that can be used in jelwery. B. Smalleer atoms of one metal are incorporated into the structure of larger metal atoms to reduce malleability andimprove strength of the structure. C. Densities of metals are closely matched to increase desirable properties without increased cost. D. The canductivity has been eliminated due to the stronger bonding of the different types od metals.
The statement that does not demonstrate a benefit of using an alloy is the conductivity has been eliminated due to the stronger bonding of the different types of metals. The answer is D.
Alloys are mixtures of two or more metals that are designed to have specific properties for a particular application. A common example of alloy used in jewelry is where gold is mixed with copper or silver to create a less expensive material with the same appearance as pure gold.
Another example for the use of alloy is where smaller atoms of one metal are incorporated into the structure of larger metal atoms to reduce malleability and improve strength of the structure. Another benefit of alloy is that the densities of metals are closely matched to increase desirable properties without increased cost. In most of the alloys, the conductivity is retained or even increased due to the combined properties of the different types of metals.
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Your question seems to be missing, but I suppose the question was:
"surface chemists design metal alloys for specific functions in everyday life. which of the following does not demonstrate a benefit of using an alloy?
A. Gold is mixed with copper or silver to make a less expensive form that can be used in jewelry.
B. Smaller atoms of one metal are incorporated into the structure of larger metal atoms to reduce malleability and improve strength of the structure.
C. Densities of metals are closely matched to increase desirable properties without increased cost.
D. The conductivity has been eliminated due to the stronger bonding of the different types of metals."
C3H8 + 5O2 --> 3CO2 + 4H2O
Assume if we combust 1.3L of propane(C3H8). How much CO2 will be produced?
4.5 L
3.9 L
2.7 L
22.4 L
The amount of carbondioxide that will be produced if 1.3L is combusted is 3.9L (option B).
How to calculate volume using stoichiometry?Stoichiometry refers to the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, propane gets combusted in air to produce carbondioxide and water as follows:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Based on the above equation, 1 mole of propane produces 3 moles of carbondioxide.
This suggests that 1.3L of propane will produce 3.9L of carbondioxide.
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A 0.95 m aqueous solution of an ionic compound with the formula MX has a freezing point of −3.0 °C. Calculate the van’t Hoff factor (i) for MX at this concentration.
The van't Hoff factor for MX in its aqueous solution at the given concentration is 1.7.
How to calculate the factorThe solution given is an aqueous solution of an ionic compound whose formula is MX. If MX is dissolved in water, it will dissociate almost completely into [tex]M^{+}[/tex] and [tex]X^{-}[/tex] ions. The particles of solute in the solution are [tex]M^{+}[/tex], [tex]X^{-}[/tex] and trace quantities of any unassociated MX. As a result, there are more solute particles in total concentration in the solution following MX's dissociation than there were in the solution prior to MX's dissociation.A colligative feature, depression in freezing point depends on the quantity of solute particles but is unaffected by the type of particles.
The van't Hoff factor is integrated into the formula for colligative qualities like depression in freezing point in order to account for the effective number of solute particles after association or dissociation of molecules of a substance in its solution.The relation between depression in freezing point (Δ[tex]T_{f}[/tex]) and concentration of the compound before dissociation or association in the solution:
Δ[tex]T_{f}[/tex] = [tex]i[/tex] × [tex]K_{f}[/tex] × [tex]m[/tex]Where [tex]i[/tex] is van't Hoff factor, [tex]K_{f}[/tex] is molal depression constant and [tex]m[/tex] is molality of the compound present in the solution.Freezing point of pure water [tex]T^{0} _{f}[/tex] = 273 KFreezing point of given solution [tex]T_{f}[/tex] = [tex]3.0^{0} C[/tex] = 273 K - 3 = 273 KDepression in freezing point Δ[tex]T_{f}[/tex] = [tex]T_{f} ^{0}[/tex] - [tex]T_{f}[/tex] = 273 K - 270 K = 3therefore Δ[tex]T_{f}[/tex] = 3 KConcentration of MX in the solution is [tex]m = 0.95 M[/tex]Molal depression constant for the solvent (water) is [tex]K_{f} =1.86 K/m[/tex] (m is the molal concentration)We have, Δ[tex]T_{f} = i[/tex] ×[tex]K_{f}[/tex] x [tex]m[/tex]Van't Hoff factor [tex]i=[/tex] Δ[tex]T_{f}[/tex]/[tex]K_{f}[/tex] x [tex]m[/tex][tex]i= \frac{3 K}{1.8K/m X 0.95m}[/tex][tex]i=[/tex] 1.7
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based on the pie chart, which of the following approaches would likely yield the biggest benefits for reducing nitrogen inputs into the chesapeake bay?
Based on the pie chart, Local governments work with farmers to implement strategies to minimize nitrogen runoff from farm fields would likely yield the biggest benefits for reducing nitrogen inputs into the chesapeake bay.
In order to control the transport of nitrogen from source regions to surface waters, managing agriculture and other human activities on the landscape usually entails reducing nitrogen applications and/or making changes to improve the efficiency of natural elimination of nitrogen. The transfer of nitrogen in particle form from the land surface to surface waters may be restricted by management techniques intended to reduce runoff and soil losses, such as riparian buffers, contour tillage, or manure or fertiliser injection.
The efficiency of management strategies for lowering nitrogen transfer from the land surface to surface waters is constrained by a number of factors and mechanisms. In anoxic riparian areas, nitrate may be converted to nitrogen gas, although it frequently moves past riparian areas to reach locations where streams discharge . Nitrogen losses may be significant where a thin surficial aquifer restricts groundwater to shallow flow paths, but minimal where a thicker surficial aquifer permits deeper groundwater flow. Variable hydrogeologic conditions on the Eastern Shore contribute to variable nutrient retention in riparian buffers.
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Based on the pie chart, which of the following approaches would likely yield the biggest benefits for reducing nitrogen inputs into the Chesapeake Bay?
using figures 5.21, 5.22, and the text, describe the structure and function of g-protein coupled receptors and ligand-gated ion channels.
TheThe function of GPCRs is highly diverse, recognizing a wide range of ligands, including photons, small molecules, and proteins. Ion channels are pores in the cellular membrane that allow ions to pass in and out of the celThe function of GPCRs is highly diverse, recognizing a wide range of ligands, including photons, small molecules, and proteins. Ion channels are pores in the cellular membrane that allow ions to pass in and out of the cell.
The function of GPCRs is highly diverse, recognizing a wide range of ligands, including photons, small molecules, and proteins. Ion channels are pores in the cellular membrane that allow ions to pass in and out of the cell.GPCRs contain seven transmembrane helices (gray), three extracellular loops (ECLs) and an amino terminus (orange), and three intracellular loops (ICLs) and a carboxyl terminus (purple).The transmembrane domain consists of the transmembrane helices, as well as the extracellular and intracellular loops.Ligand-gated ion channels (LGICs) are integral membrane proteins that contain a pore which allows the regulated flow of selected ions across the plasma membrane. Ion flux is passive and driven by the electrochemical gradient for the permeant ions.To know more about Proteins:-
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Which of these energy sources is increasing its relative share of the global energy supply by the most since 2015? renewablesnuclear coal oil
Renewable energy is increasing its relative share of the global energy supply by the most since 2015. (A)
Both globally and in the United States, renewable energy is the source of power that is expanding at the highest rate. At roughly 11.7%, the share of total energy consumption that came from renewable sources in the United States in 2019 was at its highest level since the 1930s. Solar and wind power generation have seen the most significant increases in their market share among renewable energy sources over the past ten years. In recent years, there has also been a growth in the use of liquid biofuels, which has contributed to the growing share of renewable energy in overall energy consumption. In 2020, renewable energy production in the United States finally topped coal usage for the first time.
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What is the percentage composition of each element in dinitrogen monoxide, N2O?
Percentage composition of nitrogen and oxygen are 63.6% and 36.3% respectively. This word refers to the overall mass percentage of each element contained in a compound.
What is percentage composition?The ratio of each element's quantity to the sum of all the individual components present in the compound, multiplied by 100, is what determines any compound's percentage composition.
Any compound's percent composition expresses its makeup in terms of all the components that are present. The chemical analysis reveals the relevance of this composition calculation. The concentration of such an element in a mixture or component in a combination is expressed using the idea of mass percentage composition.
percentage composition of nitrogen= (28/44)×100=63.6%
percentage composition of oxygen=(16/44)×100=36.3%
Therefore, percentage composition of nitrogen and oxygen are 63.6% and 36.3% respectively.
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Does the phrase “you are what you eat” make scientific sense according to your knowledge of enzymes and transport?
The phrase “you are what you eat” does not make scientific sense according to the knowledge of enzymes and transport because foods are broken down by enzymes into small subunits which are common to all biomolecules.
What is the role of enzymes in the digestive system?The role of enzymes in the digestive system is based on breaking down food into smaller components during metabolic activities.
Therefore, with this data, we can see that the role of enzymes in the digestive system is to degrade biomolecules that are ingested into common subunits.
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ammonium dihydrogen phosphate, formed from the reaction of phosphoric acid with ammonia, is used as a crop fertilizer as well as a component of some fire extinguishers. what are the mass percentages of nitrogen and phosphorus in the compound? round each of your answers to significant figures.
The mass percentage of the nitrogen is 24.34 % and the mass percentage of phosphorus is 26.95 %.
The formula for the ammonium dihydrogen phosphorus is NH₆PO₄.
The molar mass of ammonium dihydrogen phosphate = 115 g/mol
The molar mass of nitrogen = 28 g/mol
The molar mass of phosphorus = 31 g/mol
The mass percentage of nitrogen = (1 × 28 / 115 ) × 100 %
= 24.34 %
The mass percentage of phosphorus = ( 1 × 31 / 115 ) × 100 %
= 26.95 %
Thus, the mas percentage of nitrogen is 24.34 % and phosphorus is 26.95 %.
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Determine the number of neutrons, protons, and electrons for a bromide ion that has a mass number of 77, and a charge of −1.
Answer: For the bromide ion with a mass number of 79 and a charge of -1, there are 36 electrons, 35 protons, and 44 neutrons present for the element that has a mass
For the element that has a mass number of 56 and 30 neutrons
Explanation:
What volume of a 25% (W/V) solution of HNO3
The volume of a 25% solution of HNO3 that is needed to contain 12.6g of HNO3 is: 50.4 ml .
How to find the volume of a 25% solution of HNO3?Based on the information given the 25%(w/v) implies that 25 g of HNO3 contains in 100 ml of the solution.
Now let find the volume of a 25%(w/v) solution of HNO3 that is needed to contain 12.6 g HNO3
Volume needed = 12,6×100/25
Volume needed = 50.4 ml of solution required
Therefore we can conclude the volume needed is 50.4ml .
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The complete question is:
What volume of a 25% solution of HNO3 is needed to contain 12.6g of HNO3?
indium has only two naturally occurring isotopes. the mass of indium-113 is 112.9041 amu and the mass of indium-115 is 114.9039 amu . use the atomic mass of indium to calculate the relative abundance of indium-115. enter a numerical answer only, but in terms
The indium has only two naturally occurring isotopes. The mass of the indium-113 is 112.9041 amu and the mass of indium-115 is 114.9039 amu. The relative abundance of indium-115 is 57 %.
The average atomic mass is given as follows :
Average Atomic Mass = ∑(Relative Abundance × Mass)
The mass of indium-113 = 112.9041 amu
The mass of indium-115 = 114.9039 amu
Relative abundance for indium-113 =x
Relative abundance for indium-115 = (1-x)
x(112.9041) + (1 - x)(114.9039) = 114.818
x = 0.043 = 4.3 %
Relative abundance for indium-113 = 4.3 %
Relative abundance for indium-115 = 1 - 0.43
= 0.57 = 57 %
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Explain why the formula shown below is incorrect for the compound potassium chloride:
Formula: KCL
The formula KCL is not the correct formula for the compound potassium chloride. Potassium chloride is a compound made up of potassium and chlorine ions, and its chemical formula is KCl.
Acetylene gas (C2H2) used in welding, produces an extremely hot flame when it burns
in pure oxygen according to the reaction
2 C₂H₂(g) +5 O₂(g) → 4CO₂(g) + 2 H₂O(g).
How much H₂O is produced when 40000 g of
C₂H₂ burns completely?
Answer in units of g.
The mass of H₂O produced when 40000 g of C₂H₂ burns completely is 27692.3 g.
What is the mass of water produced when 40000 g of C₂H₂ burns completely in the air?The mass of water produced when 40000 g of C₂H₂ burns completely in the air is determined from the mole ratio as given in the equation of the reaction as follows;
Equation of reaction: 2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)
The molar mass of C₂H₂ = 26 g
The molar mass of water = 18 g
The mole ratio of C₂H₂ to H₂O is 1 : 1
The mass of water produced = 40000/26 * 18 g
The mass of water produced = 27692.3 g
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Please help on 1.15!! A, b, and/or c!
The answers to the following calculations with the proper number of significant figures and with the correct units are: (a) 8.00 kg, (b) 22.6 g, (c) 3.45 cm³
What is significant figures?
Significant figures are a way to express the accuracy of a measurement. They are the digits that are known accurately plus one last uncertain digit. This last uncertain digit is estimated based on the precision of the measuring instrument. Significant figures are used to communicate the precision of a measurement to other scientists. The number of significant figures in a measurement is dependent on the measuring instrument used.
The answer should have two significant figures, since the least precise measurement, 12.90 kg, has two significant figures. The answer should have three significant figures, since the least precise measurement, 0.64 g, has three significant figures. The answer should have three significant figures, since the least precise measurement, 0.859 cm³, has three significant figures.
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Which of the following processes start with a material that is in a fluid or semi fluid state and solidifiesthe material in a cavity: (a) casting, (b) forging, (c) machining, (d) molding,(e) pressing, and, (f) turning?
The processes of (a) casting, (d) molding, and (e) pressing all begin with a fluid or semi-fluid material and solidify it in a hollow.
What is casting?The term "casting" describes the process of creating a solid item by pouring a liquid into a mould and letting it set.
This technique is frequently used in metallurgy to create metal components, but it can also be applied to other industries like ceramics and polymers. The material used to create the mould is often one that can endure both high temperatures and the pressure of the liquid being poured into it. To speed up the solidification process, the liquid is frequently heated to a high temperature.
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What is the similarities of polar covalent bonds and nonpolar covalent bonds?
Answer:
Explanation:
Polar covalent bonds and nonpolar covalent bonds are similar in that they both involve the sharing of electrons between atoms in a covalent bond. In both types of bonds, the atoms involved share electrons in order to achieve a full valence electron shell, which gives the bond its stability.
Both polar and nonpolar covalent bonds have a covalent character, meaning they are formed by the sharing of electrons between atoms, as opposed to the transfer of electrons which is seen in ionic bonds. Also, both type of bonds are strong chemical bonds, which means they have a high bond energy, meaning they require a lot of energy to break.
your computer should be password-protected. your best protection against losing your data is to back up your files to your hard drive. firewalls inspect data transmitted between a computer and external recipients to prevent unsolicited data exchanges. with cloud storage, you can retrieve your data anytime from anywhere in the world. a thief must physically steal your computer to gain access to its files and data. there is no way to track your smartphone once it is lost.
Your best protection against losing your data is to back up your files to your hard drive. Firewalls inspect data transmitted between a computer and external recipients to prevent unsolicited data exchanges
What is password-protection?
Password protection is an access control technique that helps keep important data safe from hackers by ensuring it can only be accessed with the right credentials. Password protection is one of the most common data security tools available to users—but they are easily bypassed if not created with hackers in mind.Password protection is a security process that protects your computer from unauthorized access via authentication and verification processing. In simple words, your online information is protected using a unique password – only an authorized user with the correct password can view the content.Passwords provide the first line of defense against unauthorized access to your computer and personal information. The stronger your password, the more protected your computer will be from hackers and malicious software. You should maintain strong passwords for all accounts on your computer.To learn more about data refers to:
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help with rate order of reaction pls
The rate of reaction depends on only one of the species.
What is order of reaction?The order of a reaction is a measure of the dependence of the reaction rate on the concentration of reactants.
A reaction of zero order has a rate that is independent of the concentration of reactants, while a reaction of first order has a rate that is directly proportional to the concentration of one reactant, and so on. The overall order of a reaction is the sum of the orders of the reactants in the rate equation.
In this case, we can see that the rate of reaction depends on only one reactant.
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Please help on 1.15!!
The equation, in its most basic form, asserts that energy and mass (matter) are interchangeable; they are various manifestations of the same thing. Both energy and mass can become one another under the correct circumstances.
The universe contains how much matter and energy?Dark energy, which makes up the remaining 68.5 percent of the universe, is a mystery factor that appears to be speeding up the universe's expansion.The equation, in its most basic form, asserts that energy and mass (matter) are interchangeable; they are various manifestations of the same thing. Both energy and mass can become one another under the correct circumstances.Dark energy, which makes up the remaining 68.5 percent of the universe, is a mystery factor that appears to be speeding up the universe's expansion.The equation, in its most basic form, asserts that energy and mass (matter) are interchangeable; they are various manifestations of the same thing. Both energy and mass can become one another under the correct circumstances.The complete question is,
"Mass times light speed squared equals energy."
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metal x replaces the ions of metal y from solution, but it cannot replace the ions of metal z from solution. the order these metals should have in the activity series (from top to bottom) is
The order these metals should have in the activity series (from top to bottom) is z,x,y.
An activity series is a list of elements in order of decreasing reactivity. Elements at the top of the activity series are more reactive than those at the bottom. Since metal x can replace the ions of metal y from solution but not those of metal z, it means that metal x is more reactive than metal y but less reactive than metal z. Therefore, the order of these metals in the activity series would be z (most reactive), y (least reactive), x (more reactive).
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acetyl-coa brings carbon atoms to the citric acid cycle. these carbon atoms are passed through many intermediary steps. for example, there are
Acetyl-CoA brings carbon atoms to the citric acid cycle. These carbon atoms are passed through many intermediary steps. For example, there are 4 carbon atoms (C) present in oxaloacetate.
About Acetyl-coaA molecule important in metabolism and is useful in many biochemical reactions is called Acetyl-coa . The main function of this molecule is to provide as many carbon atoms which are in the acetyl group to the citric acid cycle to be oxidized to obtain energy, and synthesize a neurotransmitter named acetylcholine which is obtained by a chemical reaction with the help of the enzyme choline acetyltransferase and a by-product in the form of coenzyme A.
Generally, the metabolism of fatty acids will produce acetyl-CoA for the citric acid cycle. In the liver, when the circulation of fatty acids is too high, the production of acetyl CoA from reduction of fat will exceed the energy needed by the cells of the body and will form a ketone group. The high ratio of ketone groups in the blood circulation can cause ketosis or ketoacidosis.
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19. Radioactive copper-64 decays with a half-life of 12.8 days.
a. What is the value of k in s-¹?
b. A sample co rains 28.0 mg 64-Cu. How many decay events will be produced in the first second? Assume the atomic mass of 64-Cu is 64.0 u.
c. A chemist obtains a fresh sample of 64-Cu and measure radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25% of the initial measured value. How long does she have to perform the experiment?
The chemist has 14.4 days to perform the experiment.
What is the value of k in s-¹?The value of k in s-¹ is 0.0530.The number of decay events in the first second is 5.5 x 1012.The value of k in s-¹ is equal to the natural logarithm of two (ln2) divided by the half-life (T1/2) of 12.8 days. Therefore, k = ln2/12.8 days = 0.04968 s⁻¹.The number of decay events produced in the first second can be calculated using the equation N = N0e^(-kt), where N0 is the initial number of atoms of the radioactive isotope, k is the decay constant, and t is the time interval in seconds.Since the atomic mass of 64-Cu is 64.0 u and the mass of the sample is 28.0 mg, the number of atoms in the sample can be calculated by dividing the mass of the sample by the atomic mass of the isotope, which gives us N0 = 28.0 mg/64.0 u = 0.4375 x 10^24 atoms.Substituting this value for N0 and the value for k (0.04968 s⁻¹), we get N = 0.4375 x 10^24 e^(-0.04968s⁻¹) = 0.4375 x 10^24 e^(-0.04968) = 4.355 x 10^23. Therefore, the number of decay events produced in the first second is 4.355 x 10^23.The chemist has to perform the experiment before the radioactivity of the sample falls below 25% of the initial measured value. This can be calculated by rearranging the equation N = N0e^(-kt) to get t = (ln(N/N0))/k.Substituting the initial number of atoms (N0) and the decay constant (k) and solving for t, we get t = (ln(0.25N0))/0.04968 = (ln(0.25 x 0.4375 x 10^24))/0.04968 = 15.6 days. Therefore, the chemist has 15.6 days to perform the experiment.To learn more about half-life experiment refer to:
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which of the following would change the vapor pressure of a sample of water in a closed container? 1. decreasing the size of the container 2. lower the container temperature 3. removing water from the container
All of the above options would change the vapor pressure of a sample of water in a closed container.
Decreasing the size of the container would increase the vapor pressure because the number of water molecules in the container would be more concentrated.Lowering the container temperature would decrease the vapor pressure because the water molecules would have less kinetic energy and would therefore be less likely to escape as a gas.Removing water from the container would decrease the vapor pressure because there would be fewer water molecules in the container.Vapor pressure is a measure of the tendency of a substance to turn into a gas at a given temperature. It is related to the kinetic energy of the molecules of the substance, with more energetic molecules having a higher vapor pressure. In a closed container, the vapor pressure of a liquid will be determined by the temperature and the number of molecules present.
It's also worth noting that the vapor pressure of a liquid is also related to its boiling point. The boiling point is the temperature at which the vapor pressure of a liquid equals the atmospheric pressure. As the vapor pressure of liquid increases, its boiling point increases, and as the vapor pressure decreases, its boiling point decreases.
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