One of the most prevalent literary tropes, regardless of its origins, is the Hero. Nearly every story includes a Hero, who can be dressed in spandex or chainmail or just be the person who stands up to the bully in the playground.
Why would someone wear spandex?The majority of spandex fabrics are used in clothing where comfort and fit are both important, such as in hosiery, swimwear, exercise wear, socks, surgical hose, undergarments, gloves, cycling shorts, wrestling suits, rowing suits, and specialized clothing like zentai suits, motion capture suits, denims, etc.
What is the composition of spandex?At least 85% of the weight of synthetic fibers that go by the name spandex are made of polyurethane. Because of their extreme elasticity, these fibers are frequently employed. Lycra, Numa, Spandelle, and Vyrene are examples of fibers in this category that bear trademarks.
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the partial pressure of oxygen in the atmosphere is 0.2095. calculate the partial pressure in kpa. round answer to significant digits.
The value of pressure 7.0984 mmHg, the value of torr7.0984 torr. To determine the proportion of pressure from the total pressure that may be assigned to each individual gas, divide the mole fraction of each gas by the total mole fraction.
How can I determine the partial pressure?Calculating partial pressures can be done in one of two ways: 1) To determine each gas's unique pressure in a mixture, use PV = nRT. 2) .To determine the proportion of pressure from the total pressure that may be assigned to each individual gas, divide the mole fraction of each gas by the total mole fraction.Explanation:
Data obtained from the question include:
Partial Pressure of Ar = 0.2095 atm
1. The value of pressure in mmHg is obtained as shown below:
1 atm = 760mmHg
Therefore, 0.2095 atm = 0.2095 x 760 = 159.22mmHg
2. The value of the pressure in torr is obtained as shown below:
1 atm = 760torr
Therefore,0. atm = 0.2095 x 760 = 159.22torr.
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Which groups of the periodic table follow patterns in their valence electrons?.
Answer:
Valence Electrons
half life for radioactive decay of 32p is 14.2 days. how many days would be required for a sample of a radiopharmaceutical containing 32p to decreaseto 20% of its initial activity
The initial activity is t = 33.033 ≈ 3 day.
How do you calculate radioactive decay using half-life?Based on the amount of time needed for a reactant's concentration to drop to half its initial value, another method of describing reaction rates is used. The reaction's half-life, abbreviated as t1/2, is defined as this duration.As a result, the reactant concentration must decrease from [A]0 to [A]0/2 within a certain amount of time for a reaction to reach its half-life.A faster reaction will have a shorter half-life than a slower reaction if the two reactions have the same order.A given set of reaction conditions will always result in a constant half-life for a first-order reaction. Second- and zeroth-order reactions are an exception to this rule. Regardless of the reactant concentration, a first-order reaction has an independent half-life.This is clear from the equation that results from rearranging the integrated rate law for a first-order reaction:m = 0.2m × (1/2) t/14,3 ║ 0,2m
m/0,2m = (1/2) t/14,3
5=(1/2) t/14,3
log ab = C ⇔ ac = b
t/14,3 = log (1/2)5
t/14,3 = 2,31 ║× 14.3
t = 33.033 ≈ 3 day.
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Which elements do not strictly follow the octet rule when they appear in the Lewis structure of a molecule?
Select one or more:
A: Chlorine
B: Carbon
C: Hydrogen
D: Sulfur
E: Fluorine
F: Oxygen
The elements do not strictly follow the octet rule when they appear in the Lewis structure of a molecule is : chlorine and sulfur.
The elements do not strictly follow the octet rule when they appear in the Lewis structure of a molecule is chlorine and sulfur. according to the octet rule the atom most posses the 8 electrons in the outermost shell called valence electrons. The chlorine and the sulfur will sometimes expand the octet rule this means more than 8 electrons in the valence shell.
Thus, The elements do not strictly follow the octet rule when they appear in the Lewis structure of a molecule is : chlorine and sulfur.
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Can you safely reheat rice?.
It is possible to reheat the rice. rice can be heated up quickly in a wok because, unlike other fried foods, it has already been cooked at a high temperature.
Nothing changes even if you try to re-fry rice in oil. There is a link to it here. Stovetop stir-frying is the original technique. This method is my favorite's since it is the most effective at bringing back the crispness of leftover fried rice for same temperature. If it's not possible, cool the rice as quickly as you can (ideally within 1 hour). Frozen rice should only be heated up once within a day. Because its temperature is very less. Make sure the rice is properly steam heated whenever you reheat it.
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carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid. what is the molar concentration of h3o in a cola that has a ph of 4.240?
The molar concentration of h3o in a cola that has a pH of 4.240 is 5.
What is pH?
A scale is used to describe the basicity or acidity of the an aqueous solution in chemistry, with the term "potential of hydrogen" historically denoting this property. Lower pH values are recorded for acidic solutions (solutions to higher H+ ion concentrations) than for basic or alkaline remedies. The concentration of the solution's hydrogen ions is indicated inversely by the pH scale, which is logarithmic. The set of standard remedies whose pH has been established by international treaty can be used to trace the pH scale. Using a consolidation with transference, the potential difference between such a hydrogen electrode as well as a standard electrode, like the silver chloride electrode, is measured to determine the primary pH standard values.
Hence, the molar concentration of h3o in a cola that has a pH of 4.240 is 5.
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if 3.39 mol of an ideal gas has a pressure of 2.31 atm and a volume of 67.23 l, what is the temperature of the sample in degrees celsius?
Gases are difficult. They contain countless billions of energetic gas molecules that have the potential to collide and interact. Since it is difficult to precisely characterize a real gas, the idea of a "ideal gas" was developed as a rough approximation that aids in modeling and predicting the behavior of real gases.
What is the molar form of the ideal gas law?The ideal gas law, a straightforward formula, relates the pressure, PPP, volume, VVV, and temperature, TTT, of an ideal gas. We typically treat gases as ideal, unless there is a good reason to do otherwise, because of how straightforward this relationship is.PV=nRT, equals, n, R, and T
In this equation, PPP stands for the gas's pressure, VVV for its volume, TTT for its temperature, RRR for its constant, and nnn for its molecular weight.Volume V = 67.23V unitm³
Moles n = 3.39mol
Temperature T = 2.31
P = 0.96846237269814 Pa.
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The temperature of the sample in degrees Celsius is 0.96846237269814 Pa.
What is the molar form of the ideal gas law?The ideal gas law, a straightforward formula, relates the pressure, PPP, volume, VVV, and temperature, TTT, of an ideal gas.We typically treat gases as ideal, unless there is a good reason to do otherwise, because of how straightforward this relationship is.PV=nRT, equals, n, R, and TIn this equation, PPP stands for the gas's pressure, VVV for its volume, TTT for its temperature, RRR for its constant, and nnn for its molecular weight.
Volume V = 67.23V unitm³
Moles n = 3.39mol
Temperature T = 2.31
P = 0.96846237269814 Pa.
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When chlorine is added to sodium bromide solution, the mixture turns orange. What type of reaction has taken place?.
When chlorine is added to sodium bromide solution, the mixture turns orange and the reaction type for this is displacement reaction.
In the field of science, displacement reaction can be described as a type of reaction in which a more reactive element reacts or displaced the lesser reactive element.
According to the reactivity series, chlorine is more reactive as compared to bromine. Hence, when the element chlorine is added to sodium bromide, chlorine displaces bromide and forms sodium chloride. Bromine gas is released which turns the mixture to its orange color. Hence, the orange color shows that bromine gas has been displaced and sodium chloride has been formed.
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What do scientists believe caused the layers of rock in the Grand Canyon?.
In the Grand Canyon, fossils in rock layers at the bottom of the canyon are older than those in layers closer to the top.
These rock layers are significant to earth scientists because of the changes in the appearance and composition of the rock layers reflect changes in the environment over time.
They are using the changes to the rocks to infer what has happened in the area. The younger layers of rock in the Grand Canyon are on top of the older layers "principles of superposition".
The Grand Canyon was formed over 6 million years ago by the Colorado river and cut a deep channel through the rock. Sediment over time builds up on river banks and similar areas. Anything to have died near that would have been covered and then left to decompose and mineralize under ground .
Therefore, the layer of Grand Canyon is believed to be caused by the time span. The fossils are in the lower layer and as the time changes, there happened to be many other layers formed having different compositions.
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o calculate the isoelectric point of amino acids having other ionizable functional groups, we must also take into account the pka of the additional functional group in the side chain. for an acidic amino acid (one with an additional acidic oh group): for a basic amino acid (one with an additional basic nh group): pi
Two pKas—pKa1 and pKa2 for carboxylic acid and amine, respectively—define these amino acids. The isoelectronic point, pI = 1/2 (pKa1 + pKa2), will lie halfway between or at the average of these two pKas.
Who should avoid consuming amino acids?Nausea, headaches, and soreness are three of the most often stated concerns of long-term amino acid intake. Amino acid supplements may have an impact on your blood sugar levels .This implies you ought to stay away from them both before and after surgery. A single amino acid supplement is generally not recommended, according to several specialists.
Amino acids should be taken when?Adding 5-10 grams of branched-chain amino acids to your shake routine, either pre- or post-workout, is the best time to consume them in order to nourish your body and rebuild your muscles.
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When taking a measurement with a pH meter, keep the instrument in the _______1_________ until it is needed. Rinse the pH meter with _______2_______ and gently pat dry. Place the meter in the sample solution, and record the measurement when the pH _________3_________.
1. Storage Solution
2. Deionized water
3. Stabilizes
When measuring with a pH meter, keep the instrument in the Storage solution until it is needed. Rinse the pH meter with Deionized water and gently pat dry. Place the meter in the sample solution, and record the measurement when the pH Stabilizes.
A pH meter is an instrument used to measure hydrogen ion activity in solutions. It must be calibrated before taking pH readings. If exceptionally exact data are needed, calibration should be done at the start of each day or before to each measurement. Select buffers that cover the samples' range of pH values.
When removing electrodes from one solution and preparing to place them in another, ALWAYS rinse them with distilled water and blot them with Kim wipes. Glass electrodes are incredibly fragile and are constructed of very thin glass.
There are two points of equivalency. When using a pH meter to measure something, leave the device in the storage solution until you need it. With deionized water, rinse the pH meter and then gently pat it dry. Once the pH has stabilized, submerge the meter in the sample solution and take a measurement.
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Write both answers to at least two decimal places. Calculate the pH of a 0.160 M solution of KOH.Part 2 (1 point) Calculate the pOH of a 0.160 M solution of KOH.
To calculate the pH of a solution, we first need to find the concentration of hydronium ions in the solution. Since KOH is a strong base, it dissociates completely in water to produce hydroxide ions (OH-) and potassium ions (K+).
The concentration of hydronium ions in a solution of KOH can be calculated using the concentration of hydroxide ions and the equilibrium constant for water, which is equal to 1.00 x 10^-14 at 25 degrees Celsius.
The concentration of hydroxide ions in a 0.160 M solution of KOH is equal to the concentration of KOH, which is 0.160 M. The concentration of hydronium ions in the solution can be calculated using the equation below:
[H3O+] = (1.00 x 10^-14) / [OH-]
Substituting the concentration of hydroxide ions into the equation above, we get:
[H3O+] = (1.00 x 10^-14) / (0.160 M) = 6.25 x 10^-13 M
To calculate the pH of the solution, we need to take the negative logarithm of the concentration of hydronium ions. This can be done using the equation below:
pH = -log([H3O+])
Substituting the concentration of hydronium ions into the equation above, we get:
pH = -log(6.25 x 10^-13) = 12.20
The pH of a 0.160 M solution of KOH is 12.20.
To calculate the pOH of a solution, we first need to find the concentration of hydroxide ions in the solution. Since we already calculated this value above, we can simply use the concentration of hydroxide ions we found earlier: 0.160 M.
To calculate the pOH of the solution, we need to take the negative logarithm of the concentration of hydroxide ions. This can be done using the equation below:
pOH = -log([OH-])
Substituting the concentration of hydroxide ions into the equation above, we get:
pOH = -log(0.160 M) = 1.80
The pOH of a 0.160 M solution of KOH is 1.80.
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which quantities are the same for all atoms of chlorine? i number of protons ii number of neutrons iii number of electrons
The number of protons and electrons is the same for all atoms of Chlorine. The correct options are i and iii
Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. These variations in the number of neutrons result in atoms of the same element having different mass numbers.
The difference in the number of neutrons means that isotopes of an element have different atomic masses and different physical and chemical properties.
For example, Chlorine has two naturally occurring isotopes, Chlorine-35(17 protons, 18 neutrons) and Chlorine-37 (17 protons, 18 neutrons). All three isotopes have the same number of electrons and protons, but the different number of neutrons results in different mass numbers.
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Approximately what percentage of the atp formed by the reactions of glycolysis is produced by substrate-level phosphorylation?.
The percentage of the ATP formed by the reactions of glycolysis produced by substrate-level phosphorylation is 100%.
What is substrate-level phosphorylation?Substrate-level phosphorylation can be described as a metabolism reaction that occurs in the production of ATP or GTP by the transfer of phosphate from a substrate directly to ADP or GDP.
Transferring from higher energy into a lower energy production process uses some of the released chemical energy to transfer a phosphoryl group to ADP or GDP from another phosphorylated compound.
Oxidation and phosphorylation are not coupled in the substrate-level phosphorylation, and reactive intermediates are commonly gained in the oxidation processes in catabolism. Most ATP is formed by oxidative phosphorylation in anaerobic respiration while substrate-level phosphorylation gives a less efficient and quick source of ATP, independent of external electron acceptors.
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What are fire protection measures?.
Fire protection measures are the actions taken to control or safe guards the objects from fire.
In order to lower the risk of fire and, in the event of a fire, lower the damage or harm brought about by the conflagration, they combine active fire protection measures (such as fire extinguishers and sprinkler systems to combat uncontrolled fires) and passive measures (such as fireproof building materials).
The term "fire protection measures" is typically used to describe actions taken to reduce or mitigate fire hazards. The defense keeps a fire from spreading or guarantees that the building won't burn for a predetermined amount of time. Passive measures appeal is based on the dependability of this sort of security. The use of noncombustible construction materials, low-flame-spread/low-smoke-development rated materials, equipment spacing, substation grading, placing crushed rock around oil-filled equipment, etc. are examples of common passive protection methods.
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a sample of cerium-141 is available in a solution with an activity of 4.5 millicuries/ml. if 10.0 millicuries are needed for a test, how much of the solution should be measured out?
If a test calls for 10.0 millicuries, the equation calls for 2.2 mL of solution to be measured out.
What type of word is measured?As was mentioned above, the word "measured" can be a verb or a noun. Adverb usage He ran for a distance of a mile. He argued while speaking calmly. The three most widely used systems of measurement are the International System of Units (SI) numerals, old British Imperial System, and the United States Customary System.
Briefing:Here, all you need to do is use the saline solution's known chemical composition as just a calculation to determine however many milliliters would equal 10 millicuries.
As a result, you are aware that when you dissolve your cerium-141 sample in saline solution, you obtain an energy of 4.5 millicuries/mL. As a result, you know the 1 mL or saline solution can have 4.5 millicuries' worth of cerium-141 in it.
This means that a volume of corresponds to the an energy of 10. millicuries.
=10 millicuries.1mL saline/4.5 millicuries
=2.2mL saline
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Does American romantic poetry follow a fixed rhyme scheme and structure?.
American romanticism poetry does not follow a fixed rhyme scheme and structure instead they follow or stress more on emotional apart from physical.
The American Romanticism movement, which lasted from about 1830 to 1870, represented a shift away from faith and beliefs in science and reason and toward faith in emotions, feelings, and nature. the belief in humanity's goodness and the return to nature, leaving behind the source of corruption, civilization This movement gave rise to two subgenres. Transcendentalists (beliefs and emphasis on the spiritual and emotional rather than the physical) and Gothic literature (related to all what is dark, scary, gloomy and mysteries).
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put the steps of this transport pump in order na-k pump question 18 options: potassium triggers dephosphorylation of the pump which stabilizes the e1 confirmation. 2 potassium bind the e1 confirmation is open to the inside of the cell and has a high affinity for sodium 2 potassium ions are released inside the cell 3 sodium ions bind the e2 confirmation is open to the outside of the cell and has a high affinity for potassium. 3 sodium ions are released outside the cell. sodium triggers phosphorylation of the pump which stabilizes the e2 confirmation.
The carrier protein and three sodium ions first bind. The carrier protein and three sodium ions first bind. The sodium exits thanks to the altered form. Here 2 potassium ions are discharged.
The carrier protein is shaped in such a way that it can attach to potassium. The protein undergoes another shape change after the release of the sodium ions. The cell is now filled with potassium ions. The e2 confirmation is stabilized by the pump being phosphorylated by sodium, which causes it to happen. With an extremely high affinity for sodium, potassium binds the e1 confirmation, which is accessible to the inside of the cell. Inside the cell, 2 potassium ions are discharged. Three sodium ions bind to the e2 confirmation, which is accessible from the outside of the cell and has a strong affinity for potassium.
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acetyl coa is formed by the pdh complex in 3 steps - what is the correct order of these steps? group of answer choices decarboxylation, transfer to coa, oxidation oxidation, decarboxylation, transfer to coa oxidation, transfer to coa, decarboxylation
The correct order of these steps are
This conversion takes place in three steps: decarboxylation, the reduction of NAD+, and the attachment of coenzyme A.
What is Decarboxylation?
It is frequently believed that decarboxylation from the carboxylate occurs through a unimolecular dissociative mechanism that leaves behind a carbanion and CO2. 2 Because there are no realistic functions for these catalysts in the transition state for decarboxylation, this process would not be susceptible to generic acid or basic catalysis. Since a unimolecular mechanism cannot explain any observed acid or base catalysis in a decarboxylation reaction, water must play a part. It has been demonstrated that acid catalysed decarboxylation occurs via a hydrolytic process. 10,11,13 We will go through a second associative base-catalyzed decarboxylation mechanism in the section that follows. This route can be accelerated by Brnsted bases and occurs in neutral environments.
In this article, we'll discuss decarboxylation, which is most frequently associated with the release of CO2 from beta-keto acids (and malonic acids) during the creation of malonic ester and acetoacetic acid, respectively.
We'll go over a few instances, demonstrate how to avoid a common mistake with arrow pushing, and then attempt to explain why decarboxylation occurs easily with beta-keto acids but not with "regular" carboxylic acids. Along the process, there will also be tests and exercises.
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Write net ionic equation for the reaction between nitric acid and calcium hydroxide.
The net ionic equation is applied mainly in neutralization reactions, double displacement reactions and redox reactions. The net ionic equation is as follows
Ca(OH)[tex]_2[/tex](s)+2HNO[tex]_3[/tex](aq)→Ca(NO[tex]_3[/tex])[tex]_2[/tex](aq)+2H[tex]_2[/tex]O(l)
What is net ionic equation?
The net ionic equation represents a chemical equation of a reaction that give an idea of species that are really participating in the reaction. We can write net ionic equations for those electrolyte which are strong in water.
The balanced net ionic equation is
Ca(OH)[tex]_2[/tex](s)+2HNO[tex]_3[/tex](aq)→Ca(NO[tex]_3[/tex])[tex]_2[/tex](aq)+2H[tex]_2[/tex]O(l)
Thus the net ionic equation is
Ca(OH)[tex]_2[/tex](s)+2HNO[tex]_3[/tex](aq)→Ca(NO[tex]_3[/tex])[tex]_2[/tex](aq)+2H[tex]_2[/tex]O(l)
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What is the structure and function of protein albumin?.
The structure of albumin is globular and the main function of this protein is to regulate the oncotic pressure and also maintain the pH of the blood.
Albumin is generally a family of globular proteins, the most common of which are the serum albumins. All the proteins of the albumin family are usually water-soluble, and are moderately soluble in concentrated salt solutions, and also experience heat denaturation. Albumins are commonly found in blood plasma and they differ from other blood proteins in that they are not glycosylated. Substances containing albumins are called as the albuminoids.
Albumins in general are the transport proteins that bind to various ligands and then carry them around. Along with that albumin performs a variety of essential functions such as it regulates the oncotic pressure and also the pH of the blood . It also binds and transports various bioactive molecules, including proteins, peptides, fatty acids, hormones, amino acids, drugs, nutrients, and also metal ions . These properties make albumin an excellent candidate for many clinical and biotechnological applications.
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Check all features below that you included in your
Lewis structure.
correct number of P and Cl atoms
P as the central atom
line (single bond) between P and each of the
five Cl atoms
six dots (electrons) associated with each CI
atom
no other lines or dots
DONE
The phosphorous chloride Lewis structure consists of all the following elements.
Briefing:
Using phosphorus as the main atom
A line connecting Phosphorous to six dots (electrons) connected to five separate chlorine atoms.
This indicates that the phosphorus atom is surrounded by ten electrons.
The electrons of a species are depicted as dots in Lewis structure.
The valence electrons in an atom or molecule are displayed as dots in a Lewis structure. A single dash can occasionally be used to denote shared electrons in molecules.
Trigonal bipyramidal structure describes PCl5. The arrangement of the trigonal bipyramidal structure results in opposite bonds cancelling each other's dipole moments, making PCl5 nonpolar.
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compare the magnitude of the lattice energy for each of the following two ion pairs. (a) cs and br- separated by a distance of 441 pm (b) mn2 and o2- separated by a distance of 292 pm
E= -5.23 × 10^-19 J/ion pair for Cs+ Br- ion pair.
E= -1.58 × 10^-18 J/ion pair for Mn2+ O2- ion pair.
therefore, lattice energy of second compound is higher than the first one.
Lattice energy is the bond energy of the compound which is now seperated.
Formula: E = (kq1q2)/r
now inserting the values for Cs+ and Br- into the equation,
where q1 = +1, q2 = −1, and r = 441 pm
Energy associated with the formation of a single pair of Cs+Br-
E= 2.31×10^-28 (+1)(-1)/441 × 10^-12
E= -0.00523 × 10^-16
E= -5.23 × 10^-19 J/ion pair
now inserting the values for Mn+2 and O2- into the equation,
where q1 = +2, q2 = −2, and r = 292 pm
Energy associated with the formation of a single pair of Mn+2O-2
E= 2.31×10^-28 (+2)(-2)/292× 10^-12
E= -0.0158 × 10^-16
E= -1.58 × 10^-18 J/ion pair
Therefore comparing both the ion pairs , the lattice energy of Mn+2 O2- pair is higher than the Cs+ Br- ion pair.
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How do you identify a type of chemical reaction?.
Type of chemical reaction looking at the given products and reactants in the chemical equation.
When atoms' chemical bonds are established or ruptured, chemical processes take place. The materials that initiate a chemical reaction are known as reactants, while the materials created as a result of the reaction are known as products. Although a chemical reaction is not necessarily a "one-way street," as we'll examine further in the following section, it is usually shown by an arrow between the reactants and products. Some chemical processes just go in one way until all of the reactants have been utilised. It is said that these reactions cannot be stopped. But some reactions can be classified as reversible. Reactions that are reversible have the ability to move both forward and backward.
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What do you mean by characterization?.
The description of people (or other beings but rather things) in theatrical and literary works is known as characterization as well as characterization.
Character development would be occasionally used interchangeably.
Characterization would be a literary strategy that is employed in literature piece by piece to emphasize and clarify the specifics of a character in a narrative. The screenwriter establishes the character in the first act with such a definite emergence.
There are few type of Characterization.
(i)Interaction.
(ii)feelings/thoughts of the characters.
(iii)both the character's as well as other people's responses to the character.
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What is the conflict theory in social work?.
The competition among social groupings for scarce resources is the main topic of conflict theory.
Conflict definition, for instance.An ongoing argument between individuals who hold diametrically opposed principles or opinions: He and his father had a lot of disagreements. As a result of its unpopularity, the policy led to numerous disputes inside the party. Frequently, he and the president would disagree due to his outspoken opinions.
In what ways does a story conflict?These issues are known as conflicts in literature. Conflict is a more exact term for thwarted, imperiled, or competing desire. Essentially, it occurs when a character tries to accomplish a goal but is hindered by external circumstances. Perhaps something is desired by the character but is out of reach.
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How many moles of chlorine gas at 110 °c and 28. 0 atm would occupy a vessel of 15. 0 l?.
The moles of chlorine gas at 110 °C and 28. 0 atm would occupy a vessel of 15. 0 l is
the ideal gas equation is given as :
P V = n RT
where,
P = pressure = 28 atm
V = volume = 15 L
R = constant 0.082 L atm / mol K
T = temperature = 110 + 273 = 383 K
n = moles = ?
P V = n RT
n = P V / R T
n = (28 × 15 ) / ( 0.082 × 383 )
n = 420/31.406
n = 13.3 mol
the moles of chlorine is 13.3 mol
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What led to the prohibition of alcohol?.
(- Temperance Movement
there was a combination of political and social factors that led to prohibition. one of the main political factors was the Temperance Movement.
The temperance movement was a social movement against the consumption of alcohol.
a student obtains a liquid sample of green food coloring that is known to contain a mixture of two solid pigments, one blue and one yellow, dissolved in an aqueous solution of ethanol. which of the following laboratory setups is most appropriate for the student to use in order to separate and collect a substantial sample of each of the two pigments?
The set up that can be used to separate the mixture is option C.
What is chromatography?The process of chromatography can be used in the separation of the components of a mixture (Image C). In this case, it is best used when we have pigments and we want to separate them.
There has to be a stationary phase and a mobile phase in the process. The stationary phase is a adsorbent and the mobile phase is a solvent that is able to carry out the actual separation of the mixture.
Since we have a liquid sample of green food coloring that is known to contain a mixture of two solid pigments, one blue and one yellow, dissolved in an aqueous solution of ethanol, we have to use chromatography.
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suppose that daniel has a 2.50 l bottle that contains a mixture of o2 , n2 , and co2 under a total pressure of 5.10 atm. he knows that the mixture contains 0.310 mol n2 and that the partial pressure of co2 is 0.250 atm. if the temperature is 273 k, what is the partial pressure of o2 ?
The partial pressure of O₂ from daniel's 2.5L bottle that contains a mixture of O₂, N₂ and CO₂ under a total pressure of 5.10 atm is 2.171atm.
What is partial pressure?In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas as if it alone occupied the entire volume of the original mixture at the same temperature.
How to calculate the partial pressure of O₂?
Volume (V) = 2.5L
T = 273K
o₂ + N₂ + CO₂ ---> Total pressure P = 5.1atm
N₂ = 0.31 mol
Partial pressure CO₂ = 0.25atm
R = 0.0821L (ideal gas constant with given volume in L and temperature in K)
P*V = n*R*T
n = P*V / R*T
= (5.1 * 2.5) / (0.0821 * 273)
= 12.75 / 22.4133
= 0.56886 mole
Partial pressure of N₂
= mol fraction * Total pressure
= (0.31 / 0.56886) * 5.1
= 2.779atm
Total pressure
P = P O₂ + P N₂ + P CO₂
5.2 = P O₂ + 2.779 + 0.25
P O₂ = 5.2 - 2.779 - 0.25
P O₂ = 2.171atm
Therefore, the partial pressure of O₂ is 2.171atm.
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