Answer:
The two balanced reactions for the combination reactions between copper (I) and sulfur are:
Cu + S --> CuS
2Cu + 3S --> 2CuS
g the density of liquid argon just above its melting point is 1.40 g/cm3 . calculate vv for liquid argon.
The molar volume of liquid argon (Vv) is the volume occupied by one mole of the substance. Since the density of liquid argon just above its melting point is 1.40 g/cm3, we can calculate the molar volume of liquid argon by solving the following equation:
Vv = (1 mol/1.4 g) x (1 cm3/1 g) = 0.714 cm3/mol
Therefore, the molar volume of liquid argon is 0.714 cm3/mol.
Liquid volume is a measure of the amount of liquid a container can hold. It is usually measured in liters, gallons, or milliliters. Liquid volume is important in many applications, such as cooking and baking, as well as in laboratory experiments and medicine.
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Why are all living organisms based on molecules that contain carbon?
All living things contain carbon because carbon is the main component of all life on Earth and 45-50% of the biomass on earth is carbon.
Definition of CarbonCarbon is one of the elements whose existence has been understood since ancient times, and can be said to be the basic element of all life on earth. In fact, 20% of the human body is carbon.
However, the carbon in the human body and other living things is not in the form of elemental carbon, but in compounds or combined with other elements, such as hydrogen and oxygen.
Carbon compounds can be called organic compounds because organic compounds always contain the element carbon (C). These compounds are found in many living things, coal, natural gas, and petroleum with very diverse compounds.
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why calorimetry lab high percentage error
Several reasons can contribute to a high percentage inaccuracy in a calorimetry lab. Among the most prevalent reasons are:
Inadequate stirring: The heat transmission between the reaction mixture and the calorimeter is not homogeneous and constant, resulting in temperature change measurement inaccuracies.
Temperature measurement that is inaccurate: The temperature measuring instruments employed, such as thermometers or temperature probes, may have a high degree of measurement error or are not correctly calibrated.
Heat loss to the environment: If the calorimeter is not well-insulated, heat may be lost to the environment, resulting in mistakes in temperature change measurement.
Incomplete reaction: The heat of reaction may not be reliably evaluated if the reaction is not completed.
What is calorimetry?Calorimetry is the study or act of measuring changes in state variables of a body with the goal of determining the heat transfer associated with changes in its state caused by chemical reactions, physical changes, or phase transitions under defined limits in chemistry and thermodynamics. Calorimetry is the measurement of the quantity of heat transmitted to or from a material. To do this, heat is exchanged with a calibrated item (calorimeter). The quantity of heat transmitted by the process under investigation is calculated using the temperature change observed by the calorimeter.
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a 0.50 mole sample of co2g at 2.0 atm occupies 11.2 liters
The temperature of the sample is 3527.8 K, or approximately 3254.6°C.
What is ideal gas law?Ideal gas law is the equation of state of hypothetical ideal gas.
As, PV = n RT, where P is pressure, V is volume, n is number of moles, R is the ideal gas constant (8.31 J/mol*K), and T is temperature in Kelvin.
2 atm * 11.2 L = 0.50 mol * 8.31 J/mol*K * T
Converting atm to pascals:
2 atm * 101325 Pa/atm = 202650 Pa
202650 Pa * 11.2 L = 0.50 mol * 8.31 J/mol*K * T
T = (202650 * 11.2) / (0.50 * 8.31)
T = 3527.8 K or 3254.6°C.
Therefore, the temperature of the sample is 3527.8 K, or approximately 3254.6°C.
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Note: The question given on the portal is incomplete. Here is the complete question.
Question: A 0.50 mole sample of CO2(g) at 2 atm occupies 11.2 liters. What is the temperature of the sample?
What is the molecular mass of Nitrogen?
14.0067 u is the molecular mass of Nitrogen.
What is molecular mass ?
Molar mass is the mass of one mole of a substance, defined as its atomic or molecular mass in grams. It is defined as the number of units (atoms, molecules, ions, etc.) in a substance that contains the same number of units as 12 grams of pure carbon-12. The molar mass of a substance is important because it provides a conversion factor between the mass of a substance and the number of moles of a substance, allowing chemical reactions and composition of compounds to be more easily calculated. Molar mass can be calculated by summing the atomic masses of all atoms in a molecule of a substance. For example, the molar mass of water (H2O) is 18.015 g/mol. This means that 1 mole of water weighs 18.015 grams .
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what is the answer to the following calculation: 71.262 4.5 - 6 x 101 5.24
The answer to the calculation 71.262 4.5 - 6 x 101 5.24 is -110.01.
To perform this calculation, it is important to follow the order of operations (PEMDAS), which stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).
Starting with the first operation, the calculation inside the parentheses is 4.5 - 6 x 10, which becomes 4.5 - 60.
Next, we multiply 6 and 10 to get 60. Then, we subtract 60 from 4.5, which results in -55.5.
Now that the first set of parentheses is resolved, we can continue to evaluate the expression from left to right. The next two numbers are 71.262 and -55.5, so we add them to get 15.762. Finally, we subtract 5.24 from 15.762, resulting in 10.522.
Therefore, the answer to the calculation 71.262 4.5 - 6 x 101 5.24 is -110.01.
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WHOEVER ANSWERS FIRST GETS THE BRAINLIST
Answer:
A
Explanation:
Hope this helps
Answer:
To transport water and food.
Explanation:
which of these compounds would be considered an acid? * a. hcl b. nacl c. naoh d. ch4
The compounds that would be considered an acid is the correct option is a. HCl ( hydrochloric acid).
The acids are the substance that produces the hydrogen ions when dissolves in the water. The bases are the substance that produces the hydroxide ions when dissolve in the water.
1) HCl is the hydrochloric acid , it is a strong acid as when it dissolve in the water it donate more hydrogen ions.
2) NaCl is the sodium chloride , it neither a base or nor the acid . It is a neutral salt.
3) NaOH is the sodium hydroxide , it is the base as it donates the hydroxide ions when dissolve in the water.
4) CH₄ is the methane and it is not the acid or the base. It is a neutral compound.
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How do you calculate pH from pKa?
pH is calculated by dividing the weak acid concentration by the log of the conjugate base concentration and the pKa value.
How does pH formula work?You need to know the hydronium ion concentration in moles per litre to estimate the pH of an aqueous solution (molarity). The equation pH = - log [H3O+] is then used to determine the pH.
How does pKa work?A molecule's level of acidity is represented by the pKa value. A proton's grip on a Bronsted acid is used to evaluate an acid's potency. The strength of the acid and its capability to donate protons increase with decreasing pKa values.
High pKa: what does that mean?The proton availability scale (pKa scale). A proton is not trapped strongly when the pKa is low. Sometimes, the value of pKa is so low that it is a negative number. A proton is strongly confined when the pKa value is high.
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Researchers are investigating the effectiveness of using a fungus to control the spread of an insect that destroystrees. The researchers will create four different concentrations of fungus mixtures: 0 milliliters per liter (ml/L),1.25 ml/L, 2.5 ml/L, and 3.75 ml/L. An equal number of the insects will be placed into 20 individual containers.The group of insects in each container will be sprayed with one of the four mixtures, and the researchers willrecord the number of insects that are still alive in each container one week after spraying. (b) Does the experiment have a control group?
The container that contains 0 milliliters per liter (ml/L) means that there is no fungus control being added to the container, which means that this container is the control group in this experiment.
In this case, the 0 ml/L concentration represents the absence of the fungus mixture, and can serve as a reference to compare the results of the other groups. The insects in the 0 ml/L group can be considered a control group because they will provide a baseline measurement of the number of insects that are still alive after one week without the presence of the fungus mixture.
This will allow the researchers to determine if the fungus mixture had any effect on the insects, or if the decrease in insect numbers was due to other factors such as natural death or migration. By including the 0 ml/L concentration as a control group, the researchers can improve the validity of the results and increase the reliability of the conclusions drawn from the experiment.
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12
John Graham was charged in the bombing of United Airlines Flight 629 on November 1, 1955. What ultimately happened to him?
A.
B.
C.
D.
He died on the plane when it exploded.
He was found not guilty by reason of insanity.
He was convicted of murder and executed.
He escaped prison and was never captured.
Answer:C. He was convicted of murder and executed.
brianliest?
Explanation:
C. He was convicted of murder and executed.
over the course of a chemical reaction, the gibbs free energy of the system decreases. the process is ________.
A decrease in Gibbs free energy (ΔG) of a system over the course of a chemical reaction indicates that the reaction is spontaneous, meaning that it will proceed without any external intervention.
This is because a spontaneous process is one in which the free energy of the system decreases, becoming more stable and releasing energy into the surrounding environment.
The Gibbs free energy is a thermodynamic quantity that takes into account both the enthalpy (ΔH) of a system, which is a measure of the heat transfer that occurs during a reaction and the entropy (ΔS) of the system, which is a measure of the degree of disorder or randomness in the system. The Gibbs free energy equation is given by ΔG = ΔH - TΔS, where T is the temperature in Kelvin.
A decrease in Gibbs free energy indicates that the enthalpy of the system has decreased or the entropy of the system has increased, or both. When ΔG is negative, the reaction is spontaneous and will proceed in the direction that releases energy, which is generally in the form of heat or light.
Therefore, a decrease in Gibbs free energy over the course of a chemical reaction is an indication that the reaction is spontaneous and will proceed without external intervention.
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When 14. 00 ml of hcl of unknown concentration (but less than that of the base) are reacted with 13. 00 ml of 2. 15 m naoh, 1. 56 kj of heat are released. What is the molarity of the hcl solution?.
The molarity of the HCl solution is 1.99 M
For a variety of uses in chemistry, neutralizing reactions between acids and bases are utilized to create a neutral product (salt). As a result, since the HCl and NaOH reaction is the subject of this question, we can write:
HCl+NaOH ⇒NaCl +H₂O
How is molarity determined?The following formula can be used to determine a solution's molarity:
M₁V₁ = M₂V₂
Where;
M₁ is the acid's molarity.
M₂ is the base's molarity.
V₁ = acid volume
V₂ is the base volume.
Where there is a 1:1 mole ratio between the acid and the base, allowing us to set up the following:
M acid Vacid =Mbase Vbase
Macid 14. 00 ml = 2. 15 M 13. 00 ml
M acid = 2.15 x 13 / 14
M acid = 1.99 M
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What is the molar mass of Ba3(PO4)2?
Please record your answer with correct units and rounded to 3 places past the decimal.
Molar mass is an intensive property because it is independent of sample size.The molar mass of Ba₃(PO₄)₂ is 601.93 g/mol.
What is molar mass ?The molar mass of a compound is defined as the mass divided by the number of moles, which is the amount of substance. It is a quantity rather than a molecular property of a substance. They are usually computed by adding the atomic masses of the constituent elements of a compound
It is measured in kilograms per mol. Molar masses of elements are given by their relative atomic mass, while those of compounds are given by the sum of their relative atomic masses multiplied by the molar mass constant.
Thus, The molar mass of Ba₃(PO₄)₂ is 601.93 g/mol.
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What is the Lewis structure for HNO3?
The Lewis structure for HNO3 is mentioned below.
What is lewis strucure?
Diagrams that show the chemical bonds between the atoms of a molecule are known as Lewis dot structures, also known as electron dot structures. Additionally, they show the total number of lone pairs found in each of the atoms that make up the molecule. Gilbert N. Lewis introduced the Lewis structure in his 1916 article The Atom and the Molecule, and it bears his name.
What is electron ?
It is possible for an atom to have an attached or detached electron, a negatively charged subatomic particle (not bound). The electron, along with protons and neutrons, is one of the three main particle types found inside an atom. Atomic nuclei are composed of protons, neutrons, and electrons.
The nitrogen atom would form 1 double bond and 2 single bonds in HNO3 to conform to the octet rule. Three potential resonance topologies are desirable just based on the octet rule.
Therefore, Lewis structure for HNO3 is mentioned above.
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give the systematic name for the following formula: [cr(en)3](clo4)3.
Typically, coordination complexes consist of a central atom and one or more ligands. Coordination complexes are oxidized according to the same criteria as atomic, molecular, and ionic species in a generic formula.
With an example, what is coordination complex?A coordination entity is a chemical complex with a core ion or atom that is linked to a certain number of other atoms, molecules, or ions. [CoCl3(NH3)3] and [Fe(CN)6]4- are a few of instances of these coordination entities.
What does the phrase coordination complicated mean?The end result of a Lewis acid-base reaction, in which neutral molecules or anions (referred to as ligands) form coordinate covalent bonds with a central metal atom (or ion), is a coordination complex. Ligands are Lewis bases because they have at least one set of electrons that they can give to a metal atom or ion.
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in phase two, the reduction stage, what molecule will donate electrons, and therefore is the source of the reducing power?
The 1,3-bisphosphoglycerate, a low-energy acid, will accept electrons from NADPH during phase two's reduction cycle to create the three-carbon sugar G3P.
The second stage of photosynthesis uses the molecules ATP and NADPH, which are temporarily transferred the energy to. A variety of proteins and pigment compounds make up Photosystem II's reaction hub. A particular pair of chlorophyll molecules called p680, which donates an electron to the electron transport system, is at the centre of the reaction centre. The chloroplasts' thylakoid membranes are where the light reactions take place. Water splits during the light processes, acting as a source of electrons and H+ ions (protons).
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Which of the following statements regarding free energy is NOT true? a. Free energy represents the maximum work that a thermodynamic system can perform during a spontaneous change. b. Free energy represents the minimum work that would be required to make a thermodynamic system undergo a nonspontaneous change. c. The free energy of a system increases during the course of a spontaneous reaction as the entropy of the universe increases. d. The Gibbs free energy change of a reaction reflects the work associated with processes happening at constant temperature and pressure. e. The Gibbs free energy of a spontaneous process is negative.
The statements which not true are: Free energy represents the minimum work which would be required to make a thermodynamic system undergo a nonspontaneous change; and, the free energy of a system increases during the course of a spontaneous reaction as the entropy of the universe increases. The correct options are B and C.
What does free energy represent?In thermodynamics, free energy means the energy like property or state function of a system in thermodynamic equilibrium. Free energy has the dimensions of energy, and its value is measured by the state of the system and not by its history. Free energy is used to measure how systems change and how much work they can produce.
What are the characteristics of free energy?Free energy (G) is defined as H−TS where H and S are enthalpy and entropy of the system respectively T = temperature. G is an extensive property when ΔG = G2 − G1 that is the free energy change among the initial and final states of the system. G has a single value for the thermodynamic state of the system.
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What is the molar mass of iron?
55.845 u is the molar mass of iron .
What is molar mass ?
Molar mass is the mass of one mole of a substance, defined as its atomic or molecular mass in grams. It is defined as the number of units (atoms, molecules, ions, etc.) in a substance that contains the same number of units as 12 grams of pure carbon-12. The molar mass of a substance is important because it provides a conversion factor between the mass of a substance and the number of moles of a substance, allowing chemical reactions and composition of compounds to be more easily calculated. Molar mass can be calculated by summing the atomic masses of all atoms in a molecule of a substance. For example, the molar mass of water (H2O) is 18.015 g/mol. This means that 1 mole of water weighs 18.015 grams.
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why are open coal mines (strip mines) more likely to result in acid mine drainage than are underground mines?
Coal deposits that are deep underground must be extracted by subsurface mining rather than by strip-mining. It is because strip-mining would Require removal of large amounts of rock and soil.
Open coal mines (strip mines) are more likely to result in acid mine drainage than underground mines because the removal of top soil and vegetation exposes minerals and sulfides to air and water, leading to oxidation and the formation of sulfuric acid. This acid can then leach into surrounding water sources, contaminating them and posing environmental and health risks. In contrast, underground mines are protected from exposure to air and water, reducing the likelihood of acid mine drainage.
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select all the statements that correctly represent the reagents and conditions required in the various steps in the synthesis of the target molecule from ethyl benzene.
1. HNO3, H2SO4; 2. NBS, light
1. HNO3, H2SO4; 2. Br2, FeBr3
1. Br2, FeBrg; 2. HNO3, H2SO4
1. HNO3, H2O;2. Br2, heat
In Step A, the reagent is NBS with benzoyl peroxide in CCl4 at 80°C.
In Step B, the reagent is NaOC2H5 in C2H5OH at 50°C.
Acne lesions can be effectively treated with benzoyl peroxide. It has no effect on antibiotic resistance. It can be used with salicylic acid, sulfur, erythromycin, clindamycin, or adapalene (antibiotics) (a synthetic retinoid). Benzoyl peroxide/clindamycin and adapalene/benzoyl peroxide are two frequent combination medicines, with adapalene being a chemically stable retinoid that may be coupled with benzoyl peroxide, unlike Tazarotene and tretinoin.
For the treatment of acne lesions, combination treatments such as benzoyl peroxide/clindamycin and benzoyl peroxide/salicylic acid tend to be somewhat more effective than benzoyl peroxide alone. In the United States, the combination tretinoin/benzoyl peroxide was authorized for medicinal use in 2021.
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what happens if the solvent line reaches the top of your tlc plate?
When the solvent has reached top of plate, the plate is removed from the developing chamber, dried, and the separated components of the mixture are visualized. If the compounds are colored, visualization is straightforward. Usually compounds are not colored, so a UV lamp is used to visualize plates.
Do not allow the solvent front to reach the top of plate. That may cause erroneous Rf values and may cause spots that are close together to run into each other. Take plate out with tweezers and mark the solvent front line with pencil as soon as possible
With the solvent above sample spot, it will be submerged and therefore it will not travel up the plate by capillary action in the mobile phase and as result, no observation will be made as no spots will be on developed plate.
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How many grams of KMnO4 would you need to make 1 L of a 2M solution? (Formula weight of 158.04 g/mol.)
According to the given statement, 1 L of a 2M solution would require 316.08 grammes of KMnO4.
What is KMnO4 used for?Additionally known uses for KMnO4 include printing on textiles and tanning leather. Even as a cleaning solution, insecticide, and antiseptic, this substance has many uses.
They are using the molar mass - KMnO4, which would be 158.04 grammes per mole, to compute this.
In order to create the solution, we should therefore need to mix 1800 ml of water with 316.08 grammes of KMnO4.
Once the KMnO4 has been dissolved, the solution's volume should be increased to a maximum if 2000 ml (2.0 L).
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or any of the following that can exist as isomers, state the type of isomerism. [zn(en)f2]
[zn(en)f2] - optical isomer, IZn(H2O)(NH3)FCl] - no isomerism , [Pd(CN)2(OH)2]2 - geometrical isomerism.
[zn(en)f2] - It will be a tetrahedral geometry. It exhibits optical isomerism as 'en' is a bidentate ligand so it will occupy 2 valencies on the same side. It will make a pair of optical isomer
IZn(H2O)(NH3)FCl] - Here we can see that all four ligands are different so it cannot exhibit isomerism. All the ligands are of different shapes, sizes electron densities and steric hindrance
[Pd(CN)2(OH)2]2- Here we have two different monodentate ligands so a particular ligand can be at 'cis' position or 'trans' position hence exhibiting geometrical isomerism
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For any of the following that can exist as isomers, state the type of isomerism and draw the structures: (a) [Zn(en)F2] (b) IZn(H2O)(NH3)FCl] (c) [Pd(CN)2(OH)2]2?
Sort the following into the proper waste container/area. 1. Solid Waste 2. Liquid Waste Container 3. Glass Waste Container 4. Trash 5. Sink Match : used filter paper, acetone rinse, broken waterless condenser, leftover water from ice bath, leftover starting material, reaction filtrate, melting point tube,
The institutional architecture that oversees the processes of receiving, source-separating, storing, transferring, processing, and disposing of solid waste.
An effective waste management plan ought to include solid waste disposal. The method of receiving, processing, recovering resources from solid waste, and finally disposing of it is known as integrated solid waste management. An waste management strategy's three main elements are source reductions, reduction, and disposal.
These three types of trash are all essential for the management of solid waste.
It may also include paper, polymer, tetra packages, plastic canisters, glass bottles, metal objects, wood fragments, aluminium foil, and a number of other substances. Food waste, which is categorised as wet rubbish, has the potential to present.
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Arrange the following in order of decreasing temperature.
1- 273K
2-133 degrees F
3- 351 K
4- 25 degree C
5- 95 degree F
6- 58 degree F
7- 146 degree C
273 K
133 degrees F = 329 K
351 K
25 degree C = 298 K
95 degree F = 308 K
58 degree F = 287 K
146 degree C = 419 K
419 K > 351 K > 329 K > 308 K > 298 K > 287 K > 273 K
What is temperature ?The concept of temperature is used to convey quantitatively how hot and cold something is. Using a thermometer, one can gauge temperature. Thermometers are calibrated using different temperature scales that traditionally relied on different reference points and thermometric materials for definition.
Temperature is measured in Celsius (°C), Kelvin (K), Fahrenheit (°F), or Rankine and refers to the average molecular kinetic energy within a substance or system (R). It is a quantifiable physical attribute of an object, also referred to as a state variable.
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In bonding, main group elements ________ to attain the electronic configuration of the noble gas closest to them in the periodic table.
In bonding, main group elements gain or lose electrons to attain the electronic configuration of the noble gas closest to them in the periodic table.
What is a noble gas?A noble gas is a type of chemical element that is highly unreactive and does not readily form compounds with other elements. The noble gases are located in Group 8 of the periodic table and include helium, neon, argon, krypton, xenon, and radon.
This process loosing or gaining electron, is an attempt to achieve a full valence shell of electrons, which is considered to be a stable electron configuration. By gaining or losing electrons, the main group elements can achieve the electron configuration of a noble gas and thus form stable compounds.
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PLEASE ANSWER NOW!!!!!
The experimental design that have been shown is the effect of gravity on plant growth. Option D
What is experimental design?Experimental design refers to the systematic and organized approach to designing an experiment, with the aim of isolating and manipulating independent variables in order to observe the effect on a dependent variable. The goal is to establish causality, control extraneous factors, and increase the validity and reliability of the results.
It involves identifying research question, forming hypotheses, selecting participants, assigning treatments or interventions, controlling extraneous variables, and determining appropriate methods of data analysis.
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if you need more amino acids, which of these is the best:A. Eat more beansB. Go to the bathroomC. Lift weightsD. Get more sleep
The correct option is (A). For more amino acids, eating more beans is suggested. With a balance diet.
Beans are a member of the legume family of high-protein plant foods. These foods offer a supply of all nine essential amino acids in addition to being excellent sources of protein. These amino acids, in contrast to the 11 non-essential amino acids, are regarded as essential because they can only be obtained through diet. Even though the levels of these elements vary among beans, they all have a comparable ratio of vital amino acids.
Lysine
Your lysine intake can be drastically decreased by cutting out animal products from your diet. This is due to the fact that most plant-based meals lack this crucial amino acid. Beans are an exception to this rule, just as other legumes. For instance, a 140-pound individual can have 2 to 2.5 cups of cooked kidney beans, black beans, garbanzo beans, or edamame, a whole soybean product, to meet her daily lysine requirements. This is equal to four to five servings a day, which is within the recommended 5.5 ounce-equivalents of protein per day from the U.S. Department of Agriculture.
You should consume more nutrient-dense and high-fiber meals, according to the USDA. Increasing your bean intake is a good way to get the rewards of a high-fiber diet, which include better digestion, blood sugar control, cholesterol control, and weight loss or maintenance. Beans are high in protein, fibre, carbs, vitamins, and minerals yet having comparatively few calories and fats. Due to their high nutrient content, the USDA advises counting a serving of beans (1/2 cup) as two servings: one of vegetables and one of protein-containing foods. While you shouldn't only rely on beans to meet your needs for essential amino acids, they may be a wonderful addition to a diet that is well-balanced and contains a range of protein sources.
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if the rate law for a chemical reaction is: rate = k(a). what are the units of the rate constant k?
Unit of rate constant (k) = L mol -1 s.
What is the rate constant?
The rate constant can be calculated for elementary reactions using molecular dynamics simulations. One possible approach is to calculate the mean residence time of the molecule in the reactant state. Although feasible for small systems with short residence times, this approach is not widely applicable because reactions are often rare events at the molecular scale.To know more about rate constant, click the link given below:
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The units of the rate constant k depend on the units of the variable a. If the units of a are moles per liter, then the units of k would be liters per mole-time. If the units of a are moles per gram, then the units of k would be grams per mole-time.
What is variable?A variable is a symbolic name used to represent a value or set of values in a program. It is a way for a programmer to store data that can be used throughout the program. Variables can be used to store information such as numbers, strings, objects, and more. Variables can also be used to store user input, and they can be used to store the results of calculations and operations. Variables are essential for programmers to write efficient and effective code.
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