Answer:
When a liquid is remained a liquid the the particles are loose but as the liquid turns into solid the particle get more compact and closer together. So in that case the liquid will have lower density.
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Find the volume of a liquid if 32.5 g of the liquid has a density of 0.852 g/mL.
Answer: 27.69 mL^3
Explanation:
32.5 g * 0.852 g/mL=
32.5*0.852=27.69 mL^3 ==>Volume is expressed in units cubed.
What is an isotope of the same element?
Answer:
please mark as brainliest
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons . The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
example:chlorine is an example of an isotope it has a proton number of 17 and a mass number of 35 in some cases they have a proton number of 17 and a mass number of 37 there is difference in the number of neutron to calculate this we do it this way.for the first one
mass number=proton+neutron
neutron=mass number-proton
neutron=35-17
neutron=18
for the second one
neutron=37-17
neutron=20
Which noble gas has an effusion rate that is approximately half the rate of effusion for o2?
The rate of effusion rates of two
The rate of effusion rates of two different
gases are
(8) Rate of effusion of gas (T2) Rate of effusion of gan
molar mass 2 of gas molay mas 1 of gas
71/2
molar mass № 32
2 = molar mass 32
the molar mass of gas 2 128
So, the molar mass of gas = 128
approximately to molar mass
that is
equal
to
of Xenon noble
·gas.
So, Xenon noble Igas has an effusion rate of approximately half the rate of effusion for 02.
Heart failure is the most common cause. Exudate is caused by vascular or lymphatic obstruction, inflammation, infection, lung injury, and tumors. There are two types of swelling. Edema - swelling that occurs primarily in the soft tissues of the body and exudate - swelling or fluid in the common spaces. Edema and exudate are the results of changes in intracellular and extracellular fluid levels.
The cause of knee effusion determines care and treatment. When the cause of swollen joints is treated, the swelling often goes away. However, not all causes of knee fluid retention can be cured.
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100 ml of a 0.1 mm buffer solution made from acetic acid and sodium acetate with ph 5.0 is diluted to 1 l. what is the ph of the diluted solution?
The pH of the diluted solution is 5.53.
Henderson–Hasselbalch equation for buffer solution:
pH = pKa + log(c(CH₃COO⁻)/c(CH₃COOH))
pH = 5.0 ⇒ c(H⁺) = 10⁻⁵ M
pKa = 4.75 ⇒ Ka = 1.78×10⁻⁵
log(cs/ck) = 5.0 - 4.75 = 0.25
c(CH₃COO⁻)/c(CH₃COO⁻) = 10∧(0.25) = 1.778
c(CH₃COO⁻) + c(CH₃COOH) = 0.1 mM
c(CH₃COO⁻) + c(CH₃COOH) = 1 × 10⁻⁴M
c(CH₃COOH) = 3.6x10⁻⁵ M; concentration of acetic acid before dilution
c(CH₃COOH) = 3.6x10⁻⁶ M; concentration of acetic acid after 10 times dilution
c(CH₃COO⁻) = 6.4x10⁻⁵ M; concentration of sodium acetate before dilution
c(CH₃COO⁻) = 6.4x10⁻⁶ M; concentration of sodium acetate after dilution
c(H⁺) = 10⁻⁶ M; concentration of hydrogen ions
After buffer solution is diluted to 1 l:
Ka = (c(CH₃COO⁻) + x) × (c(H⁺) + x) / (c(CH₃COOH) - x)
1.78×10⁻⁵ = (6.4x10⁻⁶ M + x) × (10⁻⁶ M + x) / (3.6x10⁻⁶ M - x)
x = 2.12×10⁻⁶ M
c(H⁺) = 10⁻⁶ M + 2.12×10⁻⁶ M
c(H⁺) = 3.12×10⁻⁶ M
pH = -logc(H⁺)
pH = -log3.12×10⁻⁶ M
pH = 5.53
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In which the following cases is pressure a factor in the solubility of the solute in the solvent? a. alcohol is dissolved in water b. carbon dioxide is dissolved in sparking wine c. sugar is dissolved in water d. acetylene gas is mixed with oxygen in a blowtorch
Answer: a
Explanation:
In the redox conversion of Cr(OH)4 to
CrO2, the oxidation number of Cr goes from
(-1, 0, +3) to (-2, +6, +8). Recall that the
oxidation number of oxygen is typically -2.
among the three named compounds, predict which one has the highest viscosity at 25°c. ethane pentane decane
Decane has the highest viscosity at 25°C.
The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.
Viscosity depends on intermolecular interactions and molar mass of the substance.
Ethane, pentane and decane are acyclic saturated hydrocarbons (alkanes).
At 25°C, ethane (C₂H₆) is in gaseous state of matter. Its molecular mass is the smallest of these three molecules, so it has lowest viscosity.
Decane (C₁₀H₂₂) and pentane (C₅H₁₂) are liquids at 25°C, but decane has greater molecular mass, therefore the highest viscosity.
M(C₂H₆) = 30 g/mol; molar mass of an ethene
M(C₁₀H₂₂) = 72 g/mol; molar mass of pentane
M(C₅H₁₂) = 144 g/mol; molar mass of decane
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Calculate how much (mass) of powdered kool-aid is required to make 0.1 l of 0.2 m solution.
Mass of kool aid required is 3.42g to make 0.2 mole solution 1 liter
by the formula of molarity we know that molarity = mole/liter
We can enter those values into the equation to determine the necessary number of moles because we know that we want a 0.1Mole solution in 100 mL so by substituting the values 1/ 0.1= 0.01 moles.
We now know that there are 0.01 moles of Kool-Aid powder. Additionally, we are aware that this powder's chemical composition is c12 h22o11
By multiplying the atomic weight from the periodic table by the quantity of atoms in the compound, we may determine the molar weight of this powder. Let's calculate the powder's molar weight:
Find the carbon atomic weight
12 X 12 =144g
Then we have 22 H's, each having an atomic weight of 1.008g
22 X 11= 22g
And finally there are 11 O's, each with an atomic weight of 16g
16 X11 =176g
by adding the atomic weight of atoms 342.19g
now by finding the grams of kool compound 342.19 X 0.01mol = 3.42g.
now we know that we need 0.01 moles of the powder, and we need 3.42g of the powder to make the desired solution
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What is thermodynamics?
a. the study of electric fields
b. the study of organic matter
c. the study of the nucleus
d. the study of heat flow
answer:
d. the study of heat flow.
explanation:
thermodynamics is the study of the relations between heat, work, temperature, and energy.
What are the approximate fractional concentrations of the follow- ing phosphate species at ph values of 0, 2, 4, 6, 8, 10, and 12?
a. h3po4
b. h po
c. po43
Polyprotic Acid : Acids that can mislay, and bases that can gather up, more than one H+ (e.g. diprotic H2A and triprotic H3A acids).
Ionization take place stepwise, and each and every step has its own Ka.
H3PO4 (aq) ⇌ H+ (aq) + H2PO4 - (aq) Ka1 = 7.2 x 10-3
H2PO4 - (aq) ⇌ H+ (aq) + HPO4 2- (aq) Ka2 = 6.3 x 10-8
HPO4 2- (aq) ⇌ H+ (aq) + PO4 3- (aq) Ka3 = 4.2 x 10-13
According to question
To decide the fractional concentrations of one and all species at assorted pH values, first write the Henderson-Hasselbalch equation for each and every dissociation reaction.
Formula of Henderson-Hasselbalch equation is :
pH = pKa + log10 ([A–]/[HA])
pH = pK1+log[H2PO^4-] / [H3PO4]
pH=pK2+log[ HPO^2-] / [H2PO^4-]
pH = pK3+log[PO^3- 4] / [HPO^2- 4]
a. Fraction of H3PO4: pH0 = 0.993; pH2 = 0.58; pH4 = 0.01 ; pH 6 is negligible.
b. Fraction of HPO4 ^2- : pH 0 is negligible and 0.06; pH8 = 0.86; pH10 = 1.0; pH12 = 0.72
c. Fraction of PO3 ^2- : negligible at any pH < 10 ; pH 12 = 0.28
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10. A solid block of substance is 74.0 cm x 55.0 cm x 35.0 cm and has a mass of 569 kg. Assuming that it did not
chemically react with water or dissolve in it, would it float in the water? Remember to change kg to g. Show your work!
The object would not float but sink in water.
What is density?The term density refers to the ratio of the mass to the volume of a body. Now that we know that the density of water is 1 g/cm^3. A substance that would float in water must have a lower density than that of water.
Thus;
Mass of the object = 569 kg or 569000 g
Volume of the object = 74.0 cm x 55.0 cm x 35.0 cm = 142450cm^3
Density of the object = mass/ volume = 569000 g/142450cm^3
= 3.99 g/cm^3
Hence, the object would not float but sink in water.
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An aqueous solution contains 0.35 m ammonium nitrate. one liter of this solution could be converted into a buffer by the addition of:_________
Answer:
A strong base, such as NaOH. The amount of OH added shouldn't exceed 0.35 mols (though i would stop at 0.30 mols)
Explanation:
a weakly basic salt can be turned into a buffer by the addition of a strong base, and a weakly acidic salt can be turned into a buffer with a strong acid
A sample thought to be pure lead occupies a volume of 15.0 mL and has a mass of 160.0
The density of a sample thought to be pure lead occupies a volume of 15.0 mL and has a mass of 160.0 = 10.7 g/mol.
Evaluation :
Density = [tex]\frac{mass}{volume }[/tex]
= [tex]\frac{160}{15}[/tex]
density = 10.7 g/mol
What is meant by density of a substance ?
Density is termed because the ratio of mass of the object to the volume of the object. Different substances have several densities. The mathematical expression for density is as follows:
Density=Mass/Volume.
The mass of a substance is expressed in kilograms and therefore the volume is expressed in liter.
Volume :Volume is the total amount of space occupied by a substance, whereas mass is the amount of matter it contains in it . The amount of mass per unit of volume is a sample density.
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The first location of chemical and mechanical digestion is the stomach. true/ false
The first location of chemical and mechanical digestion is the stomach. This statement is false.
Digestion is the breaking down of large insoluble food molecules into smaller water-soluble food molecules so that they can be absorbed into the aqueous plasma. In certain organisms, these small substances are absorbed from the small intestine into the bloodstream. Digestion is important for breaking down food into nutrients that the body uses for energy, growth, and cell repair that it needs to survive.
The digestive system has many forms. A basic distinction is made between internal and external digestion. External digestion evolved early in evolutionary history, and most fungi still rely on it. During this process, enzymes are secreted into the organism's environment, where organic substances are decomposed and some of the products diffuse back into the organism. Animals have a tube (alimentary canal) where internal digestion takes place. This is more efficient as more decomposition products can be trapped and the internal chemical environment can be more effectively controlled.
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Polypeptides are synthesized from amino acid building blocks. the condensation reaction between the growing polypeptide chain and the next amino acid to be added involves the loss of:_______
Answer:
a water molecule.
Explanation:
The two reacting groups are a carboxylixc acid group (-COOH) and an amine (-CNH2). The forms the peptide link (-C-CO-N-C) and a molecule of water is released (H2O).
2. From the diagram which of the following represent a break in the
Earth's crust.
O Fault
O Intrusion
O Extrusion
give an 3 examples for the following:
Solid to solid
Liquid to gas
*I'm in 6th grade and this subject is science, thanks!)
Explanation:
brass copper mixed with zinc
A dmixture of sugar and gari
A mixture of beans and rice
Given that water is the solvent for this type of experiment, what is the best site for tritium labeling?.
The best site for tritium labeling would not exchange the tritium ions for protons in water. All of the N−H sites (II−IV) would readily exchange tritium protons due to their lone pair-facilitating protonation and subsequent tritium exchange with water, but the C−H site (I), lacking a lone pair, would retain its tritium label.
Water is an inorganic, clear, tasteless, odorless, nearly colorless chemical substance that is the main component of the earth's hydrosphere and the fluid of all known living organisms. Although it provides no food, energy, or organic micronutrients, it is essential to all known forms of life.
There are three atoms in the water molecule. Two hydrogen atoms (H) and one oxygen atom (O). This is why water is sometimes called H2O. One drop of water contains billions of water molecules. Water is wet in the sense that it is a highly mobile liquid. This is because the molecules are fairly loosely bound and thus have low viscosity.
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Determine the expected number of signals in the proton nmr spectrum for each given molecule.
The number of NMR signals represents the number of different types of protons in a molecule.
What is molecule?
A molecule is defined as a collection of two or more atoms held together by the attractive forces known as chemical bonds; depending on the context, the term may or may not include ions that fit this criteria.
The spectrum has five signals which indicate five types of different protons.
What does a type of proton mean?
Here type of proton means protons are grouped in types based on their environments.
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Question 1 (1 point)
A block has a density of 1.73 g/mL. What is the block's density in mg/L?
172
A block has a density of 1.73 g/mL has a density of 1.73 * 10⁶ mg/L.
What is density of a substance?The density of a substance is the ratio of the mass of a a given volume of a substance and the volume of that substance.
Mathematically, the density of a substance is given by the formula shown below:
Density = mass of substance/volume of substance.Depending on the units in which the mass and volume of the substance is given, the unit of density can be given as follows:
kilogram per cubic meter; kg/m³
gram per cubic centimeter; g/cm³
gram per liter; g/L
milligram per liter; mg/L
The given block has a density of 1.73 g/mL.
To convert from gram to mg, we multiply by 1000
1.73 g = 1.73 * 1000 = 1730 mg
to convert from mL to L, we divide by 1000
1 mL = 0.001 L
Density of the block in mg/L = 1730 mg/ 0.001 L
Density of the block in mg/L = 1.73 * 10⁶ mg/L
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Identify the difference between sterile water (sw) and bacteriostatic water, if any.
Use only sterile water, as was previously indicated. Water is made bacteriostatic by adding benzyl alcohol. You can immediately decide which is suitable based on allergies.
If you are allergic to benzyl alcohol, avoid using or drinking bacteriostatic water altogether and opt for sterile water.
Another distinction is with indications. The FDA regulates the purposes for which drugs are used or what is disclosed on their labels. While sterile water is designated for both irrigation and injection, bacteriostatic water is only intended for injections.
The difference of several uses, as has previously been established, is crucial. Due to the absence of a bacteriostat, sterile water can only be utilized once.
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A vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa. determine the absolute pressure in the chamber and express it in pa, kpa, bar and psi
Vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa then the absolute pressure in the chamber and express is 57kpa
Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures and absolute pressure is the sum of gauge pressure and atmospheric pressure
Here to find absolute pressure atmospheric pressure=92kpa and vacuum gage=35 kpa
Pabsolute pressure=Patmospehric pressure - Pvaccume
92-35=57kpa
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All of the following are clues that a chemical reaction has taken place except:_______
a. a color change occurs.
b. a flame occurs.
c. the reactant is smaller.
d. bubbles form.
e. a solid forms.
Explanation:
a color change occurs cause when it Colides it mixes in with the other color and changes it completely
The correct answer is option C . Clue that a chemical reaction has taken place is not that the reactant is smaller.
Let's break down each of the options to understand why option c is incorrect:
a. A color change occurs: When a chemical reaction occurs, there may be a change in color. For example, when iron rusts, it changes from a metallic silver color to a reddish-brown color.
b. A flame occurs: Some chemical reactions produce heat, and if the reaction is exothermic enough, it can produce a flame. For instance, when wood burns, a flame is produced as a result of a chemical reaction between the wood and oxygen.
c. The reactant is smaller: This statement is incorrect. A chemical reaction does not necessarily mean that the reactant becomes smaller. Reactants can combine to form a larger product or they can rearrange to form different molecules without changing their size.
d. Bubbles form: When a gas is produced during a chemical reaction, bubbles may form. For example, when vinegar (acetic acid) reacts with baking soda (sodium bicarbonate), carbon dioxide gas is released, causing bubbles to form.
e. A solid forms: Some chemical reactions involve the formation of a solid. For instance, when a metal reacts with a non-metal, such as sodium reacting with chlorine to form sodium chloride, a solid salt is formed.
Thus, clues that a chemical reaction has taken place include a color change (option a), a flame (option b), bubbles forming (option d), and a solid forming (option e). The incorrect option is c, which states that the reactant becomes smaller.
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Scientific knowledge results from the interaction of scientists who are investigating natural phenomena. Which of these BEST describes how a scientific explanation becomes widely accepted?
Group of answer choices
DNA is not necessary for an organism to reproduce.
Organisms create their own DNA sequence that is not like their parents.
. DNA contains genes that hold specific traits for an organism.
A. DNA is an exact copy from parent to offspring
The correct answer is option a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.
Scientific knowledge is the knowledge that has been acquired and tested using the scientific method. Scientific knowledge may also comprise the observation and classification of facts to establish verifiable knowledge gained through induction and hypothesis.
A hypothesis is a proposed explanation for an event that can be tested. Hypotheses, or tentative explanations, are typically generated within the context of a scientific theory. A widely accepted, rigorously investigated and verified explanation for a collection of observations or a phenomenon is what is known as a scientific theory. The basis of all scientific knowledge is a scientific theory.
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Scientific knowledge results from the interaction of scientists who are investigating natural phenomena. Which of these BEST describes how a scientific explanation becomes widely accepted?
a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.
b) It is debated by the scientific community.
c) A hypothesis is tested repeatedly and the results of the tests are debated.
d) A hypothesis is tested repeatedly and the results are mostly supported by scientific investigations.
Which of the amino acids could form a hydrogen bond with another amino acid in the chain to stablaize the secondary structure of a b-pleated sheet?
All of the amino acids could form a hydrogen bond with another amino acid in the chain to stabilize the secondary structure of a b-pleated sheet.
Protein is composed of amino acid linked with peptide bond.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone (see the picture below).
Usually, amino acid proline is found in the edge strands in beta-sheets. Beta-branched amino acids valine, threonine and isoleucine and aromatic amino acid residues tryptophan, tyrosine and phenylalanine are found middle of beta-sheets.
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In the mass spectrum of pentane, the presence of a peak with an m/z = 29 most likely is due to the loss of what radical from the molecule?
In the mass spectrum of pentane, the presence of a peak with an m/z = 29 most likely is due to the loss of butyl radical from the molecule.
A spectrum (spectra or spectra) is a state that is not confined to a particular set of values and can vary seamlessly on a continuum. The term was first used scientifically in optics to describe the rainbow colors of visible light after passing through a prism.
The Spectrum of Life in the Hall of Biodiversity is an evolutionary journey through the incredible diversity of life on Earth. The 1,500 specimens represent a wide range of bacteria, fungi, plants and animals, from the smallest microbes to giants of land and water. A spectrum is defined as the characteristic wavelengths of electromagnetic radiation (or parts thereof) emitted or absorbed by an object or substance, atoms or molecules. Examples of spectra include the rainbow, the colors of the sun's emission, and infrared absorption wavelengths of molecules.
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A sample of Element X is found to contain 75.15% of isotope type 1 (83.9118 amu) and 25.85% of isotope type 2 (86.9092 AMU). Calculate the average atomic mass.
The average atomic mass of the element X is 85.5257 amu
Data obtained from the questionFfrom the question given above, the following data were obtained:
Abundance of isotope 1 = 75.15% Mass of isotope 1 = 83.9118 amuAbundance of isotope 2 = 25.85%Mass of isotope isotope = 186.9092 amuAverage atomic mass =?How to determine the average atomic massThe average atomic mass of the element can be obtained as illustrated below:
Average atomic mass = [(Mass of isotope 1 × Abundance of isotope 1)/100] + [(Mass of isotope 2 × Abundance of isotope 2)/100]
Average atomic mass = [(83.9118 × 75.15)/100] + [(86.9092 × 25.85)/100]
Average atomic mass = 85.5257 amu
Thus, the average atomic mass of the element is 85.5257 amu
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What concentration gradients are established and maintained by the sodium-potassium exchange pump?.
The concentration of sodium is high outside the cell (extracellular fluid) and the concentration of potassium is high inside the cell (cytoplasm).
Potassium is important for keeping the body hydrated and with sodium support cellular function (sodium-potassium (Na⁺/K⁺) pump).
The sodium-potassium pump releases three Na+ ions, while in the same time two K+ ions exit the cell. For this process one molecule of ATP is consumed.
The sodium and potassium cations move against the concentration gradients.
The sodium-potassium pump keeps a higher concentration of sodium extracellularly and a higher level of potassium intracellularly.
It is very important for many physiological processes in organism.
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one isotope of tellurium, tellurium-123, has seventy one neutrons. what must tellurium's atomic number be?
The atomic number of an isotope of tellurium that has 71 neutrons is 52.
What is atomic number?The atomic number of an element is the number of protons in an atom of that element.
The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.
According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;
atomic number = 123 - 71
atomic number = 52
Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.
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Answer:
Explanation:l do not no the answer
What is the relationship between the amount of deflection and the mass of the isotope.
Explanation:
The degree of deflection directly relates to the mass of the ion: the lighter the ion, the greater the deflection and the heavier the ion, the lesser the deflection. The beam of ions is then detected
and the relative abundance of each isotope of an element canthen be determined.
please mark as brainliest
The greater the mass of the isotope lesser will be the amount of deflection. The amount of deflection is related to the mass of the isotope.
What is isotope ?An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties.
As each isotope has a different mass number, this number is written after the element name for the atom. For example, an atom of carbon with a mass number of 12 will be labeled as an atom of carbon-12. Carbon-13 and carbon -14 is also examples of carbon atom.
Thus, the greater the mass of the isotope lesser will be the amount of deflection. Deflection is depend upon the mass of atom.
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