Gold and copper are both metallic conductors that have resistivity in the range of 2 x 10-².
The semiconductor silicon has a resistivity of 6.4 x 102m.
Gold and copper are metals whereas silicon is a semiconductor . Metals are good conductors and semi conductors are not as good as metals and hence they have more resistivity. This can be attributed to band gap at the atomic level. The energy gap between valence band and conduction band is very less in metals but considerable more in semiconductors. For conduction to happen, the electrons must move from valence band to conduction band. This is easier in metals and hence resistivity is lesser in metals than in semiconductors.To know more about semiconductor visit :
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A scientist is observing a rare monkey in the jungle, and the monkey begins exhibiting an odd behavior. The scientist thinks this behavior may not have been observed in this species before, but he is not certain. The scientist records video of the behavior and takes many detailed notes.
The scientist becomes very excited about his finding and plans to share it with other scientists. The best way for him to communicate and defend his finding would be to
A.
immediately write a report claiming a newly discovered behavior, and then check later to see if others have observed it before.
B.
confirm that the behavior has not been observed before, and then present his finding in a report.
C.
defend his finding as a new discovery, even if another scientist has already published a report about the behavior.
D.
wait until other scientists ask him about his trip to the jungle, and then tell them about his finding.
What is the product of radioactive decay %e called?
• A. A gamma wave
• B. Nuclear fission
. c.
An alpha particle
• D.
A beta particle
Answer:
alpha particle
Explanation:
I'm pretty sure it's supposed to be "daughter", but I see that it's not a choice so my second best choice would be alpha particle
Is hydrogen explosive? if so what makes it explosive?
please explaen
25 points
Hydrogen is explosive, because when it is exposed to air, it reacts with oxygen, releasing heat and forms either water or hydrogen peroxide.
What is hydrogen?Hydrogen is the chemical element with the symbol H and atomic number of one (1).
Is hydrogen explosive?Yes hydrogen is explosive. When hydrogen mixes with oxygen in the air, it forms an explosive mixture.
When molecular hydrogen and oxygen are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide.
The reaction equation is given as;
H₂ + O₂ → H₂O₂ + heat
This reaction is exothermic because it releases large amount of heat to the surrounding.
Thus, hydrogen is explosive, because when it is exposed to air, it reacts with oxygen, releasing heat and forms either water or hydrogen peroxide.
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Sofia is a medical examiner who is performing an autopsy on a murder victim. What will this process MOST likely involve?
A.
She will look for trace evidence present on the body.
B.
She will donate the victim’s organs.
C.
She will prepare the victim’s body for burial.
D.
She will cremate the body.
Urgent 45 pts
Answer the next five questions based on the diagram:
How many electrons are in the n = 1 shell?
How many electrons are in the n = 2 shell?
How many electrons are needed to complete the n = 2 shell?
How many electrons are being shared between the two nitrogen atoms?
How many bonds exist between the two nitrogen atoms?
Answer:
When n = 1 then it means the first shell of an atom whereas n = 2 means the second shell of an atom and so on.
Explanation:
When n = 1 then it means the first shell of an atom whereas n = 2 means the second shell of an atom and so on.
As every atom consists of three sub-atomic particles which are protons, neutrons, and electrons.
Protons and neutrons reside inside the nucleus of an atom and electrons revolve outside the nucleus of the atom.
A covalent bond is defined as the bond formed by sharing of electrons between the two combining atoms.
Therefore, the given questions are answered as follows.
There are 2 electrons in the n = 1 shell.
There are 5 electrons in its n = 2 shell.
There are 5 electrons in nitrogen's outer shell before sharing electrons.
6 electrons are being shared between the two nitrogen atoms.
Covalent bonds exist between the two nitrogen atoms.
Explanation:
1. In the 1 shell there are 2 electrons
2. in the second shell there are 5 electrons
3. To complete the 2 shell are needed 3 electrons
4. Each of them share 3 elections
5. 3 bonds exist between the two nitrogen atoms
A solution of sodium hydroxide was titrated against a solution of sulfuric acid. How many moles of sodium hydroxide would react with 1 mole of sulfuric acid? (Hint: It may help to write out a balanced symbol equation for the reaction. The chemical formulas of the acid and alkali are shown below.)
2 moles of sodium hydroxide are required to react with 1 mole of sulfuric acid.
What is stoichiometry?
Stoichiometry refers to the relation which exists between quantities of reactant and products.It is based on the law of conservation of mass where the mass of the reactants is equal to the mass of the products.Conclusion which can be made by this statement is that reactants and products form a ratio of positive integers.
Considering the reaction between sodium hydroxide and sulfuric acid given in the question number of moles of sodium hydroxide can be found out that are required to react with 1 mole of sulfuric acid using stoichiometry concept.
H₂SO₄+2 NaOH[tex]\rightarrow[/tex]Na₂SO₄+ 2 H₂O
From the reaction it is clear that 1 mole of sulfuric acid reacts with 2 moles of sodium hydroxide
Therefore,1 mole of sulfuric acid would react with
1×2/1=2 moles of sodium hydroxide.
Thus, 2 moles of sodium hydroxide react with 1 mole of sulfuric acid.
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Which property is least helpful in identifying a sample of matter
A.Reactivity
B. Boiling point
C. Melting point
D. Volume
The property which is least helpful in identifying a sample of matter is option D. Volume.
Property including melting factor, boiling factor, density, solubility, color, odor, and so on. is bodily houses. residences that describe how a substance modifications identity to produce a new substance are chemical houses.
The reactivity of a substance is a chemical property as opposed to physical assets. The purpose qualifies as a chemical property as it is predicated on its electron configuration to decide how it's going to behave around different substances.
A matter is an attribute of depending this is unbiased its chemical composition. Density, color, hardness, melting and boiling points and electric conductivity are all examples of physical properties.
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Answer: D Volume
Explanation:
Provide at least three reasons why studying the periodic trends of elements is important towards
having a good understanding of chemistry
The reasons that studying the periodic trends of elements is important towards having a good understanding of chemistry as the periodic table contain full information regarding an element. The second reason is that it gives brief knowledge about increasing and decreasing of atomic number as well mass of the elements. The third reason is that it shows metals as well as non metals separately.
What is periodic table?Periodic table is defined as a table consist of chemical elements contains a series of atomic number generally in rows due to the reason that elements possesses same atomic number lie in the vertical columns.
Therefore, The reasons that studying the periodic trends of elements is important towards having a good understanding of chemistry as the periodic table contain full information regarding an element. The second reason is that it gives brief knowledge about increasing and decreasing of atomic number as well mass of the elements. The third reason is that it shows metals as well as non metals separately.
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Classify the following materials as: pure substance (element or compound) or mixture (heterogeneous or homogeneous) NO. MATERIALS 1. ALUMINUM FOIL 2. AIR 3. SOIL 4. WATER 5. BRONZE 6. ACETIC ACID 7. PENCIL LEAD 8. BLOOD 9. IRON FILINGS 10. GASOLINE Pure Substance or Mixture? Element or Compound Homogeneous or Heterogeneous
A sample of matter with both a definite and unchanging composition and specific chemical properties is referred to as a pure material.
A mixture is a substance comprised of two or more dissimilar chemicals that are not chemically linked.
Classify the following materials as: pure substance (element or compound) or mixture (heterogeneous or homogeneous) .
Materials
Aluminum Foil - Homogeneous MixtureAir - Heterogeneous MixtureSoil - Heterogeneous MixtureWATER - CompoundBRONZE - Homogeneous MixtureACETIC ACID - Homogeneous MixturePENCIL LEAD - ElementBLOOD - Heterogeneous MixtureIRON FILINGS - ElementGASOLINE - Homogeneous MixturePure substances and mixtures are the two broad categories into which matter can be divided. A sort of matter known as a pure substance has qualities and a steady composition throughout the sample. Physically combining two or more elements and/or compounds results in a mixture. The two types of mixtures are homogeneous and heterogeneous. Pure substances include both elements and compounds. Substances made up of multiple atom types are known as compounds. The simplest compounds are called elements because they only contain one kind of atom.
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Barnacles need a solid structure in the water to attach to and live on, which they can find on a turtle shell. The turtle is unaffected by the presence of the barnacles. That type of relationship bests describes what these two animals have?
the relationship between turtles and barnacles is an example of
co-evolution, where each species is continually adapting to changes with the other.
Barnacles attaches to turtle's shell due to its hardness. Barnacles needs a hard surface to bind with so that it can thrive. A single barnacle doesn’t harm a turtle. But excessive barnacles can make a turtle inactive,also impact its vision and make it difficult to eat, and sometimes lead to infection.
.The cyprid larvae of barnacle has a special attachment devices which allow it to hold onto the substrate, e.g. cup-shaped attachment organs on the antennae. Once barnacle is settled, the barnacle develops into an adult and attaches in different ways as gripping the skin, cementing to the shell or boring into it.
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You have a solution of 0.250 MNaCl. If you boil away 2/3 of the volume of water, what is the concentration of this solution
The concentration of this solution is 1.506 mole
The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.
Here given data is a solution of 0.250 M NaCl. If you boil away 2/3 of the volume of water
We have to calculate concentration of this solution = ?
2/3 of the volume of water is 2/3×0.250 = 0.1666
Concentration = mass of solute dissolved/volume
Concentration = 0.250 M/0.1666
Concentration = 1.506mole
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In general, what dose a subscript (such as the “2” in H2) tell about the molecule?
how many there are of each element for example H20 is 2 hydrogen atoms plus 1 oxygen atom
What is the molarity of a solution that contains 5.00 moles of solute and 25.00 Liters of solution?
Select one:
a.0.20 M
b.0.89 M
c.0.25 M
d.3.20 M
Answer:
0.20
Explanation:
Molarity= no of moles/volume in litre
=5/25
= 0.20M
Which element has an outer energy level that is almost full of electrons? O radium O carbon O krypton O iodine
Explanation:
Hi, I think the answers Iodine.
hope it helps
What is the mass number for a carbon atom that contains 6 neutrons?
The mass number for a carbon atom which contains 6 neutrons is 12.
(a) Experimental results describing a protein's amino acid composition are useful for estimating the molecular weight (MW) of the entire protein. A quantitative amino acid analysis reveals that bovine cytochrome c contains 2% cysteine (r 121 ) by weight. Calculate the approximate molecular weight of bovine cytochrome c if there are 2 cysteine residues.
(b) Bovine chymotrypsinogen has a molecular weight of 25.6 kDa. Amino acid analysis shows that this enzyme is 9% alanine (r 89.1 ). Calculate how many alanine residues are present in a molecule of bovine chymotrypsinogen. Round your answer to the nearest whole number.
The average molecular weight of bovine cytochrome c = 13800 Da
Explanation:
bovine cytochrome c contains 2 methionine residues
so the 1 mole of bovine cytochrome c will contain 2 moles of methionine residues.
molar mass methionine residue = 149 g/mol
if both residues are present at the terminal, then
'C' terminal eliminates the 'H' group and the 'N' terminal eliminate the 'OH' group
its mass = (2*149) - 1 - 17 = 280 g
mass of methionine residues in 1 mole of bovine cytochrome c = 280 g
mass % of methionine residues in bovine cytochrome c = 2%
mass % = (mass of individual component / total mass of the compound ) *100
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
mass of individual methionine residues = 280 g
mass % of methionine residues in bovine cytochrome c = 2%
2 = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
(2/100) = (280 / mass of bovine cytochrome c)
0.02 = (280 / mass of bovine cytochrome c)
mass of bovine cytochrome c = 280 / 0.02 = 14000 g
mass of bovine cytochrome c = 14000 g
since this calculation is done for 1 mole of bovine cytochrome c
so the mass of 1-mole bovine cytochrome c = 14000 g
mass of 1-mole bovine cytochrome c = molecular weight of bovine cytochrome c
The molecular weight of bovine cytochrome c = 14900 g/mol
1 g/mol = 1 Da
the molecular weight of bovine cytochrome c when both residues are terminal = 14900 Da
when both residues are not present at the terminal, then
non-terminal eliminate H2O group
mass of residues = 2*(149 -18 ) = 262 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 262 / mass of bovine cytochrome c ) *100
0.02 = 262 / mass of bovine cytochrome c
mass of bovine cytochrome c = 262 / 0.02 = 13100 g/mol
the molecular weight of bovine cytochrome c = 13100 Da
when one residue is N terminal and one is non-terminal
N- terminal eliminate 'OH' group and non-terminal eliminate H2O group
mass of residues = (2*149) - 18 - 17 = 263 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 263 / mass of bovine cytochrome c ) *100
0.02 = 263 / mass of bovine cytochrome c
mass of bovine cytochrome c = 263 / 0.02 = 13150 g/mol
the molecular weight of bovine cytochrome c = 13150 Da
when one residue is C terminal and one is non-terminal
C- terminal eliminates the 'H' group and non-terminal eliminates the H2O group
mass of residues = (2*149) - 18 - 1 = 279 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 279 / mass of bovine cytochrome c ) *100
0.02 = 279 / mass of bovine cytochrome c
mass of bovine cytochrome c = 279 / 0.02 = 13950 g/mol molecular weight of bovine cytochrome c = 13950 Da
taking average all this = (14900 + 13100 + 13150 +13950) / 4 = 55100/4 = 13775 Da
The average molecular weight of bovine cytochrome c = 13775 Da
rounding off to three significant figures
The averages molecular weight of bovine cytochrome c = 13800 Da.
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While at a crime scene, the forensic scientist sees a tiny hair on the floor next to the murder weapon. What should they do with this evidence?
A.
Collect the hair, and place it in a bag.
B.
Leave it there because it is so small.
C.
Dust it to the side so it’s out of the way.
D.
Take a photo of it, and then throw it away.
The forensic scientist should collect the hair and place it in a bag as an evidence.
How does a hair help in crime study?
Hair analysis is used as a tool widely for locating suspects in crime investigations.The hair possesses different characteristics which can be studied under a microscope which help in revealing a person's race, gender and color.
Considering if a person is poisoned, hair analysis can help in identifying the presence of poison in a the body.Although carrying out a blood test after a certain period of time to detect presence of poison will give a negative result but hair analysis would not,it would definitely reveal the body being poisoned.
Hair samples collected along with hair follicles remaining intact are useful for DNA testing.This is because every cell has a nucleus and is made up of chromosomes.The hair follicles contain DNA which provides useful information.
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If 2.25 g of orange mercury oxide decomposes to 2.09 g of liquid mercury and oxygen gas, what is the mass of oxygen produced?
Express your answer to two significant figures and include the appropriate units.
nothing
nothing
The mass, in grams, of oxygen that will be produced from the reaction to two significant figures, will be 0.17 grams.
Stoichiometric problemsMercury oxide decomposes to liquid mercury and oxygen gas. The equation for the decomposition reaction is represented below:
[tex]2HgO + heat --- > 2Hg + O_2[/tex]
Mole of 2.25 g mercury oxide = mass/ molar mass
= 2.25/216.59
= 0.0104 moles
Mole ratio of mercury oxide that decomposes and oxygen gas produced = 2:1.
Equivalent moles of oxygen gas produced = 0.0104/2
= 0.0052 moles
Mass of 0.0052 moles oxygen gas = mole x molar mass
= 0.0052 x 32
= 0.1664 grams
To 2 significant figures, the amount of oxygen gas produced is 0.17 grams.
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100 Points! Question in photo
The limiting reactant of the reaction will be aluminum (Al).
What are limiting reactants?In chemical reactions, limiting reactants are reactants that are available in limited quantity. Thus, these reactant determines how much of the products are formed. Other reactants in the same reaction are said to be in excess.
From the equation of the reaction:
[tex]2Al + 2KOH + 6HOH --- > 2 KAl (OH)_4 + 3H_2[/tex]
The mole ratio of Al to KOH to HOH is 2:2:6 or 1:1:3.
Mole of 3.0 g Al = 3/27
= 0.111 moles
Mole of 15 mL, 8 M KOH = 8 x 15/1000
= 0.12 moles
Mole of 75 mL of distilled water = 75/18
= 4.167 moles
From the above number of moles of each reactant and the mole ratio, it is obvious that Al with 0.111 moles is the limiting reactant.
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Answer:
4.0 grams?
Explanation:
I DONT KNOW IF I AM RIGHT but if i am i wish u luck <3
hope i helped
What is the density of sulfuric acid if the mass of the acid is 6.514 x 10¹ g and the volume
is 3.54x 10¹ mL?
The density of the sulfuric acid is 1.840 g/ml.
Given,
Mass of sulfuric acid = 6.514 × 10 g
Volume of sulfuric acid = 3.54 × 10 ml
We have to find the density of the sulfuric acid.
The density of any substance is defined as the mass per unit volume of the substance. Or, it is the ratio of mass to volume. The units of density are kg/m³, g/ml, or g/cm³.
It is given by the formula:
Density = Mass/ volume
Density = 6.514 × 10 g/ 3.54 × 10 ml
Density = 1.840 g/ml
Hence, the density of sulfuric acid is 1.840 g/ml
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True or false The density of a subsidence is always the same
How are elements organized in the periodic table?
A. By decreasing abundance
OB. By decreasing reactivity
OC. By increasing atomic number
OD. By increasing atomic mass
The elements are organized in the periodic table By increasing the atomic number.
The periodic desk is organized into companies' vertical columns, intervals horizontal rows, and families organizations of factors that might be similar. factors in the identical institution have the same range of valence electrons. Dmitri Mendeleev created the periodic desk by using arranging his factors in order of growing atomic mass. He determined that when they have been organized in this manner they form a repeating sample that is periodically repeated every seven factors.
The chemical factors are organized so as of increasing atomic range. The horizontal rows are called intervals and the vertical columns are called agencies. factors within the equal institution have comparable chemical houses. this is due to the fact they have an identical range of outer electrons and identical valency. The vertical columns on the periodic desk are referred to as corporations or families due to their comparable chemical behavior. all of the participants of a family of elements have an equal number of valence electrons and similar chemical homes.
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If a normal dose CT scan delivers 700 mrem of radiation, how many CT scans would a
patient have to have to feel mild radiation sickness (50 rem)? Please help
The number of CT scans that a patient will have to undergo in order to feel mild radiation sickness would be 72 CT scans
Dimensional analysisThe normal dose CT scan delivers 700 mrem.
700 mrem = 700 x [tex]10^{-3}[/tex] rem
700 x [tex]10^{-3}[/tex] rem is equivalent to 0.7 rem.
In order for a patient to feel mild radiation sickness, 50 rem is needed.
If 1 CT scan is equivalent to 0.7 rem, then how many CT scans will give 50 rem?
= 50 x 1/0.7
= 71.429 scans
Since CT scans cannot be a fraction, we then need to approximate to the nearest whole number.
Thus, a total of 72 CT scans will be required for a patient to have a feeling of radiation sickness.
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There are numerous starting points that a composer could use when writing a piece of music.
A. True
B. False, dynamics and tempo are the only starting points
C. False, composers never us a starting point
D. False, structure is the only starting point
It's true that there may be numerous starting points that a composer could use when writing a piece of music.
The composer may moreover start at a one-of-a-kind figure depending on the thoughts they've at that minute in time. In other expressions, it may be said that a vocalist or a guitarist is alluded to as a performer for that tally number. A composer is that as it may be an individual who sets a track to a song. Musical composition can talk about a unique piece or work of the track, both vocal or instrumental, the structure of a melodic piece, or the strategy of making or composing an unused piece of music. individuals who make modern compositions are alluded to as composers.
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How many quarts are equal to 5 pounds of Ethanol? The density of Ethanol is 0.789 g/mL
The volume of the ethanol in quarts is determined as 3.04 quarts.
Mass of the ethanolThe mass of the ethanol is calculated as follows;
volume of the ethanol = mass of the ethanol / density of the ethanol
mass of the ethanol in grams;5 pounds = 2267.96 g
volume of the ethanol in milliliter (mL);volume of the ethanol = (2267.96 g) / (0.789 g/mL)
volume of the ethanol = 2,874.47 mL
volume of the ethanol in quarts1 mL = 0.00105669 quart
2,874.47 mL = ?
= 2,874.47 mL x 0.00105669 quart/mL
= 3.04 quarts
Thus, the volume of the ethanol in quarts is determined as 3.04 quarts.
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Scientific equation of how many gallons is in 1 liter?
Answer:
1 liter = 0.264172 us gallon
Explanation:
A 4g book a 7kg lamp both in the living room
The distance between them is 2.5 m.
What is the distance of separation?Now we know that the Newton's law of gravity said that the gravitational force of attraction between two objects is directly proportional to the product masses of the objects and inversely proportional to the distance of separation.
Now, given that;
F = Gm1m2/r^2
F = gravitational force
G = gravitational constant
m1 = mass of the book
m2 = mass of the lamp
r = distance of separation
r = √ Gm1m2//F
r = √6.67 * 10^-11 * 4 * 7/2.99 10^-10
r =2.5 m
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Missing parts;
A 4 kg book and a 7 kg lamp are both in the living room. If the force of gravity between them is 2.99 10-10 N, how far apart are they?
The police chief has reported that the evidence from the crime scene has been contaminated. What MOST likely happened in this scenario?
A.
The evidence was collected properly and brought to the lab.
B.
Outside materials were mixed in with collected evidence.
C.
The crime scene was preserved exactly as it was found.
D.
The local court accepted this evidence at a criminal trial.
The MOST likely happened in a situation where the police chief has reported that the evidence from the crime scene has been contaminated is the fact that outside materials were mixed in with collected evidence (Option B).
What does the crime scene mean?The expression crime scene refers to all evidence found in a given place after a crime, which is fundamental to solving this type of police case.
In conclusion, the MOST likely happened in a situation where the police chief has reported that the evidence from the crime scene has been contaminated is the fact that outside materials were mixed in with collected evidence (Option B).
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Which organelle in a cell contains DNA (genetic information)?
(A) mitochondrion
(B) ribosome
(C) chloroplast
(D) nucleus
Answer:
the answer is d the nucleus
Explanation:
the nucleus is like in the middle of a cell and I think is the most important.
hope this helps :)
what is electrophoresis ?...
Electrophoresis can be defined as a molecular biology procedure to separate biomolecules depending on the weight and electrical charges.
What is Electrophoresis?Electrophoresis is a molecular biology procedure in which biomolecules such as DNA or proteins can be separated by their electrical charges and weight. For example, DNA has a negative charge thereby it migrates to the positive pole under an electrophoretic field and different DNA molecules can also be separated by their weight in base pairs.
In conclusion, electrophoresis is a technique used in molecular biology laboratories to separate biomolecules depending on the weight and electrical charges.
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