The value of K(a) is 1.4 × 10⁻⁴.
The pH scale is used in chemistry to determine whether an aqueous solution is basic or acidic. Historically, pH stood for "potential of hydrogen." The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
A weak monoprotic acid, lactic acid (HA) dissociates in accordance with the following equilibrium:
HA ⇋ H⁺ + A⁻
K(a) = [H⁺] × [A⁻] / [HA]
If C is the initial acid concentration and x is the dissociated concentration of each product, then the expression at equilibrium is:
K(a) = x² / ( C− x )
Now substituting the values C = 0.10 m and the ph of lactic acid is 2.43 in:
x = [H+]
[H+] = 10^{− pH}
10⁻²·⁴³ = 3.63 × 10⁻³ M
Therefore,
K(a) = x² / ( C − x )
K(a) = ( 3.63 × 10⁻³ M)² / ( 0.10 M − 3.63 × 10⁻³ M )
K(a) = 1.4 × 10⁻⁴
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a certain ore is 27.9'.9% nickel by mass. how many kilograms of this ore would you need to dig up to have 85.0 g85.0 g of nickel?
To get 85g of nickel, 0.304 kilogram of the ore must be mined.
27.9% of what = 85g
0.279 * x = 85
x = 304.6g = 0.304kg
What is ore?
Ore is a naturally occurring rock or silt that has one or more precious minerals in it that may be extracted, processed, and sold for a profit. Metals are the most common valuable minerals found in ore. To remove the valuable metals or minerals from ore, it is mined from the earth and then processed or refined, frequently by smelting.
An ore is a naturally occurring collection of minerals from which metals can be profitably extracted. Originally, the term "ore" solely referred to metallic minerals, but today it also refers to nonmetallic materials that have been deposited in rock after it has formed.
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When molecules fluoresce, the emitted photon has ________ energy compared to the absorbed photon.
In molecules fluoresce, the emitted photon has lower energy when compared to the absorbed photon.
What kind of molecules show fluorescence?The most extreme fluorescence is found in compounds having aromatic levels with low-energy π→π∗ transitions. A few aliphatic, alicyclic carbonyl, and positively conjugated double-bond structures also show fluorescence. Most unsubstituted aromatic hydrocarbons fluoresce in the solution again.
What makes a molecule fluoresce?If a molecule soaks the light of one wavelength and emits it in another i.e., fluoresces, we reach that molecule as a fluorophore.
Some molecules are capable of being eager, via absorption of light energy, to a higher energy state, also named an excited state.
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an aqueous solution of 0.783 m silver nitrate, , has a density of 1.11 g/ml. the percent by mass of in the solution is %
An aqueous solution of 0.783 m silver nitrate, has density of 1.11 g/ml. the mass percentage in the solution is 40.1%.
What is aqueous solution?Water serves as solvent in an aqueous solution. It is mostly shown in the chemical equations by appending (aq) to relevant chemical formula.
Reactions in aqueous solutions are usually the metathesis reactions. Metathesis reactions are the another term for double-displacement; that is, when a cation displaces to form an ionic bond with the other anion. The cation bonded with latter anion will dissociate and bond with the other anion.
A common metathesis reaction in the aqueous solutions is a precipitation reaction. This reaction occurs when the two aqueous strong electrolyte solutions mix and produce an insoluble solid, also known as a precipitate. The ability of a substance to dissolve in the water is determined by whether the substance can match or exceed the strong attractive forces that water molecules generate between themselves. If the substance lacks the ability to dissolve in the water, the molecules form a precipitate.
let's take 1.00-L sample of this solution. Use given density to determine its mass
1.00L*1000mL/1L*1.47 g/1mL=1470 g
Now, this 1.00-L solution will contain
c=n V⇒ n=c*V
n=3.47moles/L*1.00L=3.47 moles
Use the molar mass of silver nitrate to help us how to determine grams of silver nitrate would contain this many moles 3.47
moles AgNO3
169.87 g*1mole AgNO3=589.4 g AgNO3
Now, solution's percent concentration by mass is defined as the mass of the solute, in your case silver nitrate, divided by the mass of the solution, and multiplied by 100
%w/w=mass of solute/mass of solution×100
Plug in your values to get
%w/w=589.4g1470g×100=40.1%
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A remote-controlled helicopter flew west at a constant velocity for 27.5seconds. it flew 352meters in that time. what was the helicopter's velocity
The helicopter's velocity is 12.8 m/s
What is velocity?We can determine how quickly or slowly an object is traveling by using the phrases velocity and speed. We frequently encounter circumstances when we must determine which of two or more things is traveling quicker. If the two are traveling in the same direction on the same road, it is simple to determine which is quicker. It is challenging to identify who is moving the fastest when their motion is in the opposite direction. The idea of velocity is useful in these circumstances. Learn more about velocity in this article, including its definition, how it is measured, examples, and the distinction it makes from speed.
find the velocity.distance =352 meters
Time = 27.5 seconds
velocity =?
v= d/t
where;
V= velocity
D= distance
T=time
applying formula:-
v=352 /27.5
=12.8 m/s
The helicopter's velocity is 12.8 m/s
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If one or more nucleotide pairs are deleted from a dna strand, this is known as a:_________
a. frameshift mutation
b. point mutation
c. missense mutation
d. silent mutation
If one or more nucleotide pairs are deleted from a DNA strand, this is known as a frameshift mutation.
What is frameshift mutation? explain its function.
An indel (insertions or deletions) of a number of nucleotides in a DNA sequence that is not divisible by three results in a frameshift mutation, also known as a framing error or reading frame shift. The triplet structure of gene expression by codons means that an insertion or deletion might alter the reading frame (the arrangement of the codons), leading to a translation that is entirely different from the original. A frameshift mutation is different from a single-nucleotide polymorphism, in which a nucleotide is substituted rather than inserted or deleted, and the protein is more altered the sooner in the sequence the deletion or insertion occurs.
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a snow falls ln a cold after non is an example of
A snow is basically made up of individual ice crystals which grow during suspended in the atmosphere, usually within the cloud. The snow fall is an example of precipitation.
At what temperature snow fall?For the formation of snow, the temperature required at the level of air at which it form must be below or at freezing 32° F or 0°C. Snow falls with the warmer air and it ends up on the ground in the form of rain. Rain also falls in colder layers and end up in the form of sleet. We also have the freezing rain which starts off in a warmer layer and freezes when the surface layer of air is below or at freezing.
What is Precipitation?Precipitation is a type of water phase which dorm in the atmosphere and falls on the earth surface.
Types of precipitationRainHailSnowThus, we concluded that the snow falls ln a cold afternoon is an example of precipitation.
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Which statement would be the most useful for deriving the ideal gas law?
O Volume is directly proportional to the number of moles.
O Volume is inversely proportional to the temperature.
O Pressure is directly proportional to the volume.
O Pressure is inversely proportional to the number of moles.
Mark this and return
hs
The correct answer is a) Volume is directly proportional to the number of moles.
The Volume is directly proportional to the number of moles according to the Ideal Gas Equation.
Ideal Gas Equation is given as:
PV = nRT
where, P is the Pressure of the gas
V is the Volume of the gas
n is the number of moles of gas
R is the Universal Gas Constant
T is the Temperature
Since, it can be seen from the Ideal Gas Equation that the Volume is directly proportional to the number of moles, Universal Gas Constant and Temperature.
Similarly, Pressure is directly proportional to the number of moles, Universal Gas Constant and Temperature.
Also, the Pressure is inversely proportional to the volume of the gas.
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Calculate the energy of a gamma ray photon whose frequency is 5.02x10^20 Hz
Ashton wants to find the
volume of a block of
wood. The density of the
block was 30 g/mL and the
mass of the block was 125
g. What is the volume of
the block of wood?
►
The volume of the wood is 4.167 mL.
All three-dimensional objects have a certain amount of volume. It's the area that a particular object takes up.
Mass is the total amount of matter of an object or a particle. This term is also used to measure inertia, which is the body's resistance to acceleration when a net force is applied. A body's mass has an impact on how strongly it attracts other bodies through gravity.
The density of the wooden block is 30 g/mL.
The mass of the wooden block is 125 g.
So, m = 125 g
ρ = 30 g/mL
The density of an object is given as the mass of the object per unit volume.
Therefore,
density = mass / volume
ρ = m / V
V = m / ρ
V = 125 g / 30 g/mL
V = 4.167 mL
Hence, the volume of the block of wood is 4.167 mL.
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Give role
Of pharynx??
Answer:
pharynx
Explanation:
The pharynx, usually called the throat, is part of the respiratory system and digestive system. It carries air, food and fluid down from the nose and mouth. The pharynx is the site of common illnesses, including sore throat and tonsillitis.
Explanation:
Pharynx (Throat) The pharynx, usually called the throat, is part of the respiratory system and digestive system. It carries air, food and fluid down from the nose and mouth. The pharynx is the site of common illnesses, including sore throat and tonsillitis.
emerging separation techniques: supercritical fluid and ionic liquid extraction techniques for nuclear fuel reprocessing and radioactive waste treatment
Separation techniques supercritical fluid and ionic liquid extraction techniques for nuclear fuel reprocessing and radioactive waste treatment are used to for minimizing the liquid waste
Supercritical fluid is the process of separating one component from another using supercritical fluids as the extracting solvent and ionic-liquid-based extraction separation method, which applies ILs as diluents and/or extractants for solvent extraction. advanced separations technology is key to closing the nuclear fuel cycle and relieving future generations from the burden of radioactive waste produced by the nuclear power industry separation technique utilizing green solvents carbon dioxide and for dissolution and extraction of uranium dioxide and fission product relevant to nuclear waste management that's why this two techniques for nuclear fuel reprocessing and radioactive waste treatment
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Which solid has the highest melting point? why? c(s, diamond), kr(s), nacl(s), h2o(s
Diamond has the highest melting point, which is close to five thousand.
Which of the following solids has the highest melting point?When it comes to melting points, metallic solids vary greatly. Tungsten has the highest melting point of 3422°C, while mercury has the lowest melting point of -38.83°C. They are gleaming, sturdy, and malleable. Because of their delocalized electrons, they can conduct electricity.Diamond has a very high melting point because it takes a lot of energy to break through the many strong covalent bonds.As a result, we can conclude that diamond melts at around 9,000 K and between 0.60 and 1.05 TPa along the Hugoniot.covalent network solid
As a result, diamond is classified as a network covalent solid. Diamond is the hardest substance, has a high boiling and melting point, and is a poor conductor as a result of this. It is difficult due to the intermolecular covalent bonds. As a result, diamond is a network covalent solid.To learn more about solids melting point refer to
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pure, white solid, a, was heated and a colorless liquid, b, and a colorless gas, c, were produced. when an electric current was passed through liquid b, two gases were produced. which one of the following statements is correct regarding a, b, and c?
The answer should be d) A and B are compounds and C is an element
Pure chemical elements and compounds can be found in nature. An element is a substance made of the same type of atoms as a compound, whereas a compound is made of various elements mixed together in a specific ratio.
The elements iron, copper, hydrogen, and oxygen are a few examples.
Bodily characteristicsColor, density, hardness, and melting and boiling points are examples of physical qualities. The capacity of a substance to go through a particular chemical transition is described by its chemical property. We search for a chemical change to locate a chemical attribute. Mixture
The simplest substance that cannot be broken down chemically is an element. A compound is created by chemically combining two or more components. A mixture is created by physically combining two or more substances.
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The bohr radius theoretically is the __________ distance an electron can approach the nucleus in the hydrogen atom.
The bohr radius theoretically is the equal distance an electron can approach the nucleus in the hydrogen atom.
Bohr radius named after by Niels Bohr because Niels Bohr proposed the bohr model of an atom. Bohr radius is the mean radius of the orbit of an electron around the nucleus of a hydrogen atom at its ground state and is approximately equal to 5.29177×10⁻11 . the Bohr radius approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state. so theoretically distance an electron is equal approach the nucleus in the hydrogen atom.
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an irregular object with a mass of 17g displaces 4.7 L of water. density?
Those substances which do not have a fixed geometrical shape are called irregular objects an irregular object with a mass of 17g displaces 4.7 L of water and the density is 3.61gmL⁻¹
Here given data is irregular object are given and mass of this irregular object are = 17g and it displaces of water = 4.7 L
Then we have to calculate density = ?
Density is the substance's mass per unit of volume
Then Density = mass/volume
We assume that is displaces 4.7 L means this is volume
Thus, Density = mass/volume
Density = 17g / 4.7 L
Density = 3.61gmL⁻¹
An irregular object density is 3.61gmL⁻¹
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Write the logarithm as a sum or difference of logarithms. simplify each term as much as possible. log4(6ab)
a. log46 log4(a b)
b. log46 log4a log4b
c. 24log4a 24log4b
d. (log4a log4b)6
The simplification the expression log₄ (6ab) is log₄ 6 + log₄ a + log₄ b.
To generate a given number, a base must be raised to a particular exponent, power, or logarithm. If aˣ = n, then x is the logarithm of n to the base a, which is expressed mathematically as x = logₐ n.
Some properties of logarithm are:
Product rule: logₐ (mn) = logₐ m + logₐ n
Quotient rule: logₐ (m/n) = logₐ m – logₐ n
Power rule: logₐ mⁿ = n logₐ m
Consider the logarithm expression,
log₄ (6ab).
Using the properties of logarithms,
logₐ (mn) = logₐ m + logₐ n
Therefore,
log₄ (6ab) = log₄ ( 6 × a × b )
log₄ (6ab) = log₄ 6 + log₄ a + log₄ b
The correct option is (b).
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the molecular formula for both cis-2-butene and trans-2-butene is c4h8. compounds which have the same molecular formula but have different structures are called
The molecular formula for both cis-2-butene and trans-2-butene is C₄H₈. compounds that have the same molecular formula but have different structures are called isomers.
What are isomers?Isomers are substances that share the same molecular formula but differ in their structural makeup.Isomers are substances that share the exact same empirical formula and the exact same number of atoms but differ from one another in atomic arrangement.Deuterium and tritium are two examples of isomers of hydrogen.There is a hierarchy in isomeric connections. When examined more closely, two compounds that appear to be the same constitutional isomer may really be stereoisomers of one another.Even when two molecules share the same stereoisomer, they may have different conformational shapes or be isotopologues.The area of research or the chemical and physical characteristics of interest determines how in-depth the investigation is.Learn more about isomers from the given link
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for what maximum kinetic energy is a collision between an electron and a hydrogen atom in its ground state definitely elastic?
The calculated kinetic energy is 10.2 J
Measurements have been made of the cross section for the elastic scattering of electrons with energies lower than 10.2 eV by free hydrogen atoms. The signal from the electrons that were scattered by the beam appeared at the modulation frequency and at a predetermined phase, allowing for their identification. The ratio of the hydrogen atoms and the molecule's cross sections was directly measured, and absolute values for the atomic cross section were calculated using the absolute molecular cross-section.
The experimental findings support the theory.
Electron energy in the ground state is 0.13.6
In the second energy level, 3.4
Total energy level difference = 10.2
Thus, kinetic energy equals 10.2.
Therefore, we are aware that some electron kinetic energy was transmitted to the hydrogen atom during an elastic collision.
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Hat is the major organic product obtained from the following sequence of reactions? (ch3)2chch2mgbr
The major organic product obtained is
The right response is (D) (CH3)2CH2CH2CH2OH.
Alcohols react with PBr3 and become bromides.
When bromides and magnesium combine, Grignard reagent is created.
What is a major product?
The main product of a reaction would be the one that is more stable and hence most likely to form. Propene added electrophilically to HBr would be one instance.
The right response is (D) (CH3)2CH2CH2CH2OH.
Alcohols react with PBr3 and become bromides.
When bromides and magnesium combine, Grignard reagent is created.
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Perform each operation. Express your answers to the correct number of significant figures.
a. 61.2 m + 9.35 m + 8.6 m
b. 9.44 m – 2.11 m
c. 1.36 m + 10.17 m
d. 34.61 m – 17.3 m
In the correct significant figures, the solutions to the given problems are;
61.2 m + 9.35 m + 8.6 m = 79.15 m9.44 m – 2.11 m = 7.33 m1.36 m + 10.17 m = 11.53 m34.61 m – 17.3 m = 17.31 mWhat is significant figure?The term significant figures refers to the number of important single digits in the coefficient of an expression in scientific notation.
61.2 m + 9.35 m + 8.6 m = 79.15 m
9.44 m – 2.11 m = 7.33 m
1.36 m + 10.17 m = 11.53 m
34.61 m – 17.3 m = 17.31 m
Thus, in the correct significant figures, the solutions to the given problems are;
61.2 m + 9.35 m + 8.6 m = 79.15 m9.44 m – 2.11 m = 7.33 m1.36 m + 10.17 m = 11.53 m34.61 m – 17.3 m = 17.31 mLearn more about significant figures here: https://brainly.com/question/24491627
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Phosphorus-32 has a half-life of 14.0 days days. starting with 2.00 g of 32p32p, how many grams will remain after 112 daysdays pearson?
Phosphorus-32 has a half-life of 14.0 days. starting with 2.00 g of 32p
What is half life of an element?
A substance's half-life is the amount of time it takes for half of it to decompose. When referring to radioactive elements, where the number of atoms gradually decreases over time, the term "half-life" was originally employed. Today, it is employed in numerous more circumstances where something falls rapidly.
50% of the initial mass remains after the first half life.
25% of the initial mass remains after the second half life.
12.5% of the initial mass remains after the third half-life.
6.25 percent of the initial mass is still present after the fourth half-life.
3.125% of the initial mass remains after the fifth half-life.
1.5625% of the initial mass is still present after the sixth half-life.
7th half life: 0.78125 percent of starting mass remains
8th half life: 0.390625% of starting mass is still present.
Here, we must first determine the number of half lives for phosphorus-32. Number of half lives=Totaltime/Timeforonehalflife is the formula.
One half life takes 14 days out of the whole time of 112 days. Therefore, the number of half lives is equal to 112/14, which equals 8.
The mass of P-32 that remains after 8 half lives must now be calculated.
As of the fifth half-life, 0.390625 percent of the starting mass was still present.
⇒ P-32 left mass is equal to 0.390625 of 2.00 g, or 0.0078125 g.
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A student who was trying to determine the concentration of escherichia coli in a sample completed a total plate count assay. After plating 1ml of the 10-6dilution tube and incubating the plate at 37oc for 24 hours the student counted 210 colonies on the plate. What is the cfu/ml of the original sample?.
Colony forming units/ml (CFU/ml) of the original sample are 2.1 * 10^8 CFU/mL according to the total plate count test.
The number of colonies created per given mL of the final diluted sample of the cultivated bacteria is measured by the colony forming units/ml (CFU/ml) of a given sample of cultured bacteria.
CFU = number of colony-forming units on the countable plate*1/FDF
where
FDF = final dilution factor
The sum of all dilution factors from the initial sample to the countable plate results in the final dilution factor.
As per the given data:
FDF = 1*10^-6
Number of the colony-forming units on the countable plate = 210
The colony forming units/ml (CFU/ml) of the original sample = 210*1/1*10^-6
The colony forming unit/ml(CFU/ml) of the original sample is 2.1*10^8 CFU/ml
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mercury, also known as quicksilver, is a metallic element and a liquid at room temperature. calculate mercury's density if a sample of mercury is found to have a mass of 537.0537.0 g and a volume of 39.9939.99 ml.
The mass upon volume take the measure of the substance is known to be its density.
As we know the formula of density is:
density = mass / volume. ------ (1)
Mercury is a heavy silver colored element.
Also called as a quicksilver , it's formula is Hg.
Mercury's atomic number is 80.
According to question,
It is given in the question,
Mass of mercury ( Hg) = 537.0537.0 g
Volume of mercury (Hg) = 39.9939.99 ml
Now putting the given values in formula (1)
density = 537.0537.0 / 39.9939.99
density = 13.42 g/ml
Hence, the density of mercury is 13.42 g/m
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If i have 82 ml of a solution with a molarity of 5.3 m nabr, how many ml of a 1.1 m nabr solution can i prepare? 395.1 ml 0.07 ml 17.0 ml 478.1 ml
I have 82 ml of a solution with a molarity of 5.3 m nabr. We can make 395.1 ml ,1.1M NaBr solution from 82 ml of 5.3 M NaBr solution.
What is molarity?
The number of moles of solute per litre of solution is known as molarity or molar concentration, and it may be determined using the equation: To convert between the mass or moles of solute and the volume of the solution, utilise molar concentration.
The ratio of the moles of the solute whose molarity needs to be calculated is multiplied by the volume of solvent needed to dissolve the supplied solute.
Molarity (M) = moles of solute ÷ liters of solution
I have 82 ml (= 0.082 liter) of a solution with a molarity 5.3 M NaBr. Here the moles of solute is-
5.3 = Moles of solute ÷ 0.082
Or, Moles of solute = 0.4346 moles
Now if we dilute the 82 ml, 5.3 M NaBr solution to make a new solution with a molarity of 1.1 M , the total volume of the new solution will be-
1.1 = 0.4346 ÷ liters of solution
Or, liters of solution = 0.3951
0.3951 liters = 395.1 ml
So, we can make 395.1 ml ,1.1M NaBr solution from 82 ml of 5.3 M NaBr solution.
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a water molecule can bond to up to other water molecules by bonds. a water molecule can bond to up to other water molecules by bonds. two ... hydrogen three ... ionic four ... polar covalent two ... polar covalent four ... hydrogen
Answer: four…Hydrogen
Explanation:
a water molecule is joined to 4 other water molecules by hydrogen bonds. (I also had this question)
experiment 1: spectroscopy-infrared (ir) spectroscopy and nuclear magnetic resonance (nmr) spectroscopy
(IR) spectroscopy analyses a sample using infrared radiation. nuclear magnetic resonance (NMR) spectroscopy makes use of the spin states of protons and, to a lesser degree, other nuclei.
what is spectroscopy-infrared (ir) spectroscopy and nuclear magnetic resonance (nmr) spectroscopy?
As the name suggests, infrared (IR) spectroscopy analyses a sample using infrared radiation, which is a range of frequencies below the visible spectrum. However, IR spectroscopy works with wavenumbers as opposed to describing the light in terms of frequencies (the reciprocal of wavelength).
In order to identify a molecule, nuclear magnetic resonance (NMR) spectroscopy makes use of the spin states of protons and, to a lesser degree, other nuclei. The two spin quantum states that we identified as +1/2 and -1/2 for electrons are possible.
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The partial melting of ____ will yield mafic (basaltic) magma. diorite granite peridotite rhyolite andesite
The answer would be mantle rocks i.e., the partial melting of mantle rocks will yield basaltic magma, diorite granite peridotile rhyolite andesite.
The mantle rocks are partially melted because the mantle is comprises of many various kinds of minerals, it does not melt accordingly. As minerals with lesser melting points converted into liquid magma, those with inflated melting points endure as solid crystals. This method is called as partial melting.
The properties that aim partial melting Rocks is because of decompression, heat input, or addition of a flux.
Mantle rocks are also known as semi molten rocks , generally silicates are found there.
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What is this common laboratory equipment called and what is its purpose
Answer:This is a Flint lighter, It's usually used to make sparks to light things like burners in chemistry.
Explanation:
Molecule in a pizza that is a polymer; has oxygen, hydrogen, and sulfur atoms; and is hydrophilic. what kind of molecule is?
The molecule in this pizza is a "protein" because it is already mentioned and cleared from the question that it is a polymer, hydrophilic, and it's made up of oxygen, hydrogen, and sulfur atoms.
Explanation :
Amino acid is a simple term defined as an organic chemical compound that comprises of an acidic carboxyl group (COOH), a basic amino group (NH_2NH2).
It is unique chain group.
Protein : The hydrophilic, macromolecule (polymer) that is made as a result of the unison of the chain of the many amino acids is known as Protein.
Protein normally comprises of various elements such as Oxygen (O2), Hydrogen (H2), Sulphur atoms.
Hence, it is pretty much clear from the above explanation that molecule in a pizza that is a polymer, has O2, H2 and Sulphur atoms and that is also hydrophilic is a molecule of "Protein".
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a cell containing 97% h2o is placed into a 90% h2o solution. the solution is to the cell, which would cause the size of the cell to
A cell containing 97% h₂o is placed into a 90% h₂o solution. the solution is to the cell and there the size of the cell will shrink .
What is a solution ?A particular kind of homogenous mixture made up of two or more substances is known as a solution. The solution is formed when a solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture.Solute + Solvent = Solution
The cell will cremate because the water in the solution will gets released and there the state of equilibrium exists and that can be determined as Hypertonic solution.
A liquid that has a higher concentration of dissolved particles than regular cells and blood do, like salt and other electrolytes. For instance, wounds are soaked in hypertonic liquids.
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