The approximate concentration of reaction product in a solution that has an absorbance of 0.7 at ph 6.0 is based on the equation A = εbc given in the passage, the concentration c is the absorbance A divided by the absorptivity ε in a 1 cm path length cell. 0.7 divided by approximately 1400 gives 500 μM.
A = εbc
0.7 = 1400 x c
7/14000 = 1/2000 = 0.0005 = 5x10^-4 = 500 μM
1 μM = 1 x10 ^-6
The concentration of a substance is the amount of solute present in a given volume of solution. Concentration is usually expressed in molarity, defined as the number of solutes in 1 L of solution. Solution concentration is a measure of the amount of solute dissolved in a given amount of solvent or solution.
Concentrated solutions are solutions that contain relatively large amounts of solutes. Dilute solutions are solutions that contain relatively small amounts of solutes. The definition of concentration means the amount of an ingredient or part relative to other ingredients or parts. An example of concentration is the amount of salt to water in a brine solution.
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Explain the technique for measuring the freezing point of a solution. why is salt added to the ice?
Technique that are used to measure the freezing point of a solution is the osmometer it uses the solution's freezing point depression to put up its brawn. It is used to manage the level of osmotically felicitous body fluid in a lot of chemicals mixed in the blood operate the relationship which a mole of mixed substance lessen the freezing point of water(H2O) by 1.86 °C (35.35 °F).
The Rast method is also there.
Beckmann thermometer
When added to ice, salt first bring to an end in the film of liquid water that is always near by on the surface, thereby clouded its freezing point below the ices temperature. Ice in contiguity with salty water therefore melts, produce more liquid water, which mixed more salt, thereby lead to more ice to melt, and so on.
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A ______________ is a type of mass movement where the material stays fairly coherent and moves over a well-defined surface.
a. rock fall
b. earthflow
c. debris avalanche
d. slump
e. debris flow
A Slump is a type of mass movement where the material stays fairly coherent and moves over a well-defined surface.
What is a slump?
A slump is a colloquial expression denoting a precipitous drop in commercial activity, trade, or market values. The term "slump" is particularly adaptable since it may be used to refer to both a brief, abrupt collapse and a longer-lasting, more steady period of low activity or value. There are downturns in the markets, the economy, industries, and incomes, among other things.
A slump typically refers to the start of a recession in economic terms. The months prior to the official announcement of a recession are simply referred to as a protracted economic slump because a recession is not officially announced until several months of decreased activity have passed.
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A marble rolls down a ramp that is 16 meters long. It takes the marble .5 seconds to reach the bottom of
the ramp. What is its average speed?
Answer:
average speed = 32
Explanation:
the formula is speed = distance / time
so s = d / t
s = 16 m / 0.5 s
s = 32 meter per second
A 23.98 gram sample of chromium is heated in the presence of excess iodine. a metal iodide is formed with a mass of 199.6 g. determine the empirical formula of the metal iodide.
The empirical formula of the metal iodide is Cr2I.
Mass of Chromium = 23.98
Molar Mass of Chromium = 51.9961
= 0.461 mol
Molar Mass of iodide = 126.9
= 199.6-23.88/126 = 1.394
The ratio between
Chromium and iodinei is1:2.So, the empirical formula is therefore Cr2I
Empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.[1] A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.
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The reaction of benzaldehyde with acetone and sodium hydroxide produces ____________ This is an example of ____________ reaction.
The reaction of benzaldehyde with acetone and sodium hydroxide produces DibenzalacetoneThis is an example of an aldol condensation reaction.
A physical reaction is a reaction in which a change in the physical properties of matter or substances occurs. Physical properties include density, mass, and volume. The definition of a physical reaction is a reaction in which molecules undergo molecular rearrangements but do not change chemically.
A response, although technically a reaction, takes into account the desired outcome of the interaction. Reactions can produce positive or negative results, but reactions are designed to produce positive or negative results. To react is emotional, to react is emotional intelligence.
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What chemical bonds stabilize the different structures in primary, secondary, tertiary and quaternary structures?.
Peptide bonds, hydrogen bonds, disulfide linkages, van der Waals, and electrostatic forces of attraction are the chemical bonds that stabilize the different structures in primary, secondary, tertiary, and quaternary structures.
The advanced structure of proteins gives rise to two kinds of major molecular shapes which are fibrous as well as globular structures. The main forces which are involved in stabilizing the secondary along with the tertiary structures of proteins include hydrogen bonds, disulfide type linkages, van der Waals attraction, and electrostatic forces of attraction.
The primary structure is generally determined by adjoining peptide bonds where the link is adjoining amino acids in sequential order. Tertiary structure is determined by the existence of disulfide bonds in between hydrophobic interactions as well as cysteine residues whereas the quaternary type structure is determined by multiple subunits of a protein that undergo various interactions.
Hydrogen bonds exist in a protein molecule as its large number can form between adjacent regions of the polypeptide chain in folded form and stabilize its three-dimensional kind of shape.
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How many covalent bonds are predicted for an atom of si? enter your answer in the provided box.
Covalent bonds predicted from an atom of Silicon (Si) are Four covalent bonds.
Covalent bonds are generally formed by the non-metals. These bonds are formed when electrons are shared between the atoms. To know the number of covalent bonds in any atom, you must know the number of valence electrons.
Those elements which belong to the period 2 forms covalent bond as-
8 - number of valence electrons.
Those elements which are from period 3, they form covalent bonds exactly same as the number of valence electrons.This is because d-orbitals are present in the period.
Silicon is the 14th element which belong to period 3. The electronic configuration of 1s² 2s² 2p⁶ 3s² 3p²
Just like Carbon (C), Silicon (Si) is tetravalent in nature, which means that it can easily share all four of its valence electrons and form covalent bonds. To become stable, Silicon(Si) will form four covalent bonds.
Silicon has four valence electrons, so it will form four covalent bonds.
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If the energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j, and the electron starts at level n = 4, what is the level (n) of the final state of the electron?
If the energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j, and the electron starts at level n = 4 then final state of the electron is n=2
Here given data is energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j and electron starts at level n = 4 then from ground state to excited state n=2 final state are seen from given data energy of the photon = E= -2.18×10⁻¹⁸J (1/nf²-1/ni²) using this formula ans is to be 0.235 and this energy is n=2 are seen thats why final state of electron are seen in n=2
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An experiment requires 18.0 g of cyclohexane, which has a density of 0.7781 g/mL at 25°C. What volume of cyclohexane should be used?
Taking into account the definition of density, the volume of cyclohexane should be 23.13 mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
Volume of cyclohexaneIn this case, you know that:
Density= 0.7781 g/mLMass= 18 gReplacing in the definition of density:
0.7781 g/mL= 18 g÷ volume
Solving:
0.7781 g/mL ×volume= 18 g
volume= 18 g÷ 0.7781 g/mL
volume= 23.13 mL
In summary, the volume of cyclohexane should be 23.13 mL.
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What can be said about the mass of the 1.0 m hcl and 1.0 m naoh solutions after they were combined?
The can be said about the mass of the 1M HCl and 1 M NaOH after they were combined
The combined mass of the 1 M HCl and 1 M NaOH was the sum of their respective masses.
So, hydrochloric acid reacts with sodium hydroxide approach to form sodium chloride and water. This response can be represented as: Hydrochloric acid + Sodium hydroxide → Sodium chloride + Water.
The mass of the 1.0 M HCl and 1.0 M NaOH solutions after they were combined is 76.5g.
HCl + NaOH ⇄ NaCl + H₂O
1 mole of HCl produces 1 mole of NaCl
36.5g of HCl produces= 58.5g of NaCl
36.5g of HCl produces= 18g of H₂O
Total mass after combining = 58.5g + 18g = 76.5g
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why are group O called inert gases
Answer:
They are called inert gases because they are stable and non-reactive. They have a full outer shell of valence electrons which gives them little tendency to participate in chemical reactions.
Explanation:
They are also know as the "noble" gases.
A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol. What is its molecular formula?.
A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol and the molecular formula is C₂H₂ ethyne
Molecular formula of compound is (CH)n and the given molar mass is 26g/mol
Molar mass of (CH)n, C=12=n(12+1)=13n
So 13n and n=2
=13×2=26 and given molar mass is also 26g/mol
So here two carbon and two hydrogen so molecular formula is C₂H₂ and name is ethyne
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Calculate the ph of a solution prepared by dilution 3.0 ml of 2.5 m hcl to a final volume of 100 ml with h2o.
The pH of the solution after dilution is 1.125.
HCl is hydrochloric acid. It is known by the name muriatic acid. It is among the strong acids. It has a pungent smell and is colorless. It has a molar mass of 36.4 g/mol. It's a common reagent used in pharmaceutical industries. It is also used in other industries such as textile, rubber, and metal.
The volume of HCl added to the solution = 3.0 ml
The molar concentration of HCl = 2.5 M
Let the molar concentration of the solution after dilution is x.
The volume of the diluted solution = 100 ml.
The molar concentration of the solution after dilution is,
[tex]M _{1} V _{2} = M_{2} V _{2} [/tex]
[tex]M_{2} = \frac{ M _{1} V _{2}}{V _{2} }[/tex]
[tex]M_{2} = \frac{2.5 \times 3}{100} [/tex]
[tex] = 0.075 \: M[/tex]
Thus, the molar concentration of the solution after dilution is 0.075 M.
The pH of the solution after the dilution is,
[tex][HCl] = [H ^{ + } ] = 0.075 \: M[/tex]
[tex]pH = - log [H ^{ + } ] [/tex]
[tex]pH = - log(0.075)[/tex]
[tex]pH = 1.125[/tex]
Therefore, the pH of the solution after dilution is 1.125.
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4. anthraquinone contains only carbon, hydrogen and oxygen. when 4.8mg of anthroquinone is burned14.22mg of co2and 1.66mg of h2o are produced. the molar mass anthroquinone is 208g/mol. determine the molecular and empirical formula of anthroquinone.
The molar mass of anthroquinone is 208g/mol. The empirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂
What is the empirical and molecular formula?The empirical formula is only a ratio of the moles of the various chemicals expressed in whole numbers. They are the elements that make up the compound.
The total number of atoms of an element in a compound is indicated by the molecular formula. It is the total atoms.
Thus, the mpirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂.
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please help me with this problem
Answer:
Which problem ??
Explanation:
Can you write your problem ??
Transmembrane proteins move ions or molecules across a membrane against their concentration gradient. True or false?.
The above statement is True.
Transmembrane proteins are the integral proteins, which helps ions and molecules to cross the membrane against the concentration gradient.
The transmembrane protein consist of both hydrophobic and hydrophilic amino acid side chains in his structure.
A membrane protein Is a protein molecule that is joined to or connected to an organelle’s or cell’s membrane. Depending on how the protein is connected to the membrane, membrane proteins can be divided into two categories, integral and peripheral membrane proteins.
The plasma membrane contains integral membrane proteins that are permanently ensconced there. They perform a variety of crucial functions like moving molecules through ion channels or transferring them across membranes.
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-1.42, 3, 32.5%, √4, 2³, −0.375, 3/8 as a decimal least to greatest
Answer:
-1.42, -0.375, 32.5% (.325), 3/8 (.375), √4 (2.0), 3 (3.0), 2³ (8.0)
If 40 kcal of heat is added to 1.0 kg of water, what is the resulting temperature change?
The resulting temperature change is: 40 degrees c
Here given heat added to system 40kcl
Weight of water 1kg we know the specific heat of water is
S= 4.2 J/g \degree c=1 cal/g\degree c
Q=40kcal m=1.0 kg=4000 g
We have the heat transfer equation given by
Q= ms\Delta t where Q=heat energy m=mass
\Delta t=change in temperature
Put the values and we'll have a change in temperature
\Delta t= [tex]\frac{Q}{ms}[/tex]
\Delta t= 40 degree C
Temperature is a numerical expression of how hot a substance or radiation is.
There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are not defined by theoretical principles but rather by useful empirical properties of particulate matter.
A thermometer is used to determine temperature. It is calibrated using different temperature scales that historically defined themselves using different reference points and thermometric substances.
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2.0 moles of a monatomic ideal gas undergoes an isobaric process in which the temperature changes from 260 k to 320 k. what is the change in the internal energy of the gas?
The change in the internal energy of the gas is 1.5×10∧3 J.
The internal energy of an ideal gas is directly proportional to the temperature of the gas:
ΔE = 3/2 × n × R × ΔT
ΔT = 320 K - 260 K
ΔT = 60 K; change of the temperature
n = 2.0 mol: amount of a monatomic ideal gas
R = 8.1 J/mol×K;the ideal gas constant
ΔE = 3/2 × 2 mol × 8.1 J/mol×K × 60 K
ΔE = 1500 J
ΔE = 1.5×10∧3 J; the internal energy of the gas
Isobaric process is a type of process in which the pressure of the system stays constant.
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Which triacylglycerol yields more energy on oxidation: one containing three residues of linolenic acid or three residues of stearic acid?
The Tricyglycerol yields more energy on oxidation is the one containing three residues of stearic acid because it get fully reduced.
when atom or ion loses the electron in the process called as oxidation or the loss of hydrogen is called as oxidation. when the atom or ion gain electron in the process called as reduction or gain of hydrogen is called as reduction
when the oxidation takes place the oxidation state of atom increases and when reduction takes place the oxidation state of species decreases.
when molecule is oxidized, it loses energy and when molecule is reduced , it gains energy
Thus ,we can say that,The triacyglycerol cotaining the three stearic acid residues yield more energy because it is fully reduced.
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2.what is the purpose of the sodium sulfate? (1 pt) why did you rinse the sodium sulfate with an additional portion of methylene chloride?
To ensure that the 9-Fluorenone was totally dry, it had to be washed with methylene chloride. To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.
What is the purpose of the sodium sulfate?Although it has numerous additional uses, sodium sulfate is primarily employed in the production of detergents and in the Kraft process of paper pulping. The decahydrate's natural mineral form, mirabilite, accounts for about half of the world's output, with the other half coming from chemical byproducts. Sodium sulfate was used as a drying, isolating, and anhydrous salt for the 9-fluorenone.To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.The sodium salt of sulfuric acid is known as sodium sulfate. Na2SO4 is the chemical formula for sodium sulfate. The mineral thenardite, which is also known as anhydrous sulfate, is described as a white, crystalline solid, whereas the decahydrate Na2SO4. 10H2O is also known as Glauber's salt or the mirabilis salt.
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Metallic bonds are responsible for many properties of metals such as conductivity true or false?.
It is true that metallic bonds are responsible for many properties of metals such as conductivity.
Metallic bond is a type of chemical bond.
Metallic bond is formed between electrons and positively charged metal ions.
Substances with metallic bond conduct an electric current in liquid and solid state, because they have mobile electrons.
Most metals (for example sodium, calcium, iron, silver) have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.
Metallic bond increace electrical and thermal conductivity.
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which of these measurements has only nonsignificant zeros? group of answer choices 506 ml 400. ml 0.0037 ml 60.0 ml
The answer to this question is
0.0037 ml is the measurement which has only non-significant figures.
The basic rules of significant figures are:
Every non-zero digit is a significant figure. For example, 456 has three significant figures.The zeros that are in-between are also significant. For example 809 has three significant figures.If the zeros are on the right side of a decimal point, they are also significant. For example, 8.00 has three significant figures. The leading zeros are not significant. For example, 0.07 has only two significant figures.If you need to learn more about significant figures, click here
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Your general impression suggests that your immediate action should be to: ____.
a. call for additional help.
b. apply oxygen.
c. dress her burns.
d. apply spinal immobilization.
Your general impression suggests that your immediate action should be to call for additional help. The correct option is a.
What is immediate action?Immediate actions are the actions that are taken without taking any time. These actions are taken when there is no time to think, and you should immediately think about the actions. The emergency condition needs immediate help.
During the time of general impression, one should immediately call for additional help. Additional people will give you suggestions for the problem.
Thus, the correct option is a. call for additional help.
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Convert 175mm to centimeters
Answer: 17.5 cm
Explanation:
10 mm=1 cm
175mm * 1 cm/10 mm=
175/10 cm=17.5 cm
If you have 9 moles of cacl2 and all the na3po4 i needed, how many moles of nacl could you produce?
If you have 9 moles of CaCl₂ and all the Na₃PO₄i needed 18 moles of NaCl
In the chemical reaction here
CaCl₂ + Na₃PO₄ → Ca₃(PO₄)₂ + NaCl if we balance this chemical reaction then
3CaCl₂ + 2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl then Ca=1×3=3
,Cl=2×3=6,
Na=3,PO₄=1,
all this are in reactant Ca=3, Cl=1, Na=1, PO₄=2 all this are in product so NaCl produce 18 moles.
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A solution has an H3O+ concentration of 3.5 x 10^-5 M. Is it acidic or basic?
What is the pH of a 4.0 x 10^-3 M solution of NaOH?
How many grams of NaCl can be formed if 10.0 mL of a 0.20 M HCl sample is mixed with 10.0 mL of a 0.40 M NaOH sample?
The mass of NaCl produced is 0.117 g.
What is the pH?The pH of a solution is what tells us if the solution is acidic or basic. The solution is acidic if the pH of the solution is less than 7.
1) pH = - log(3.5 x 10^-5 M)
= 4.45
Thus the solution is acidic.
2) We can see that the concentration as given is the concentration of OH^-
[OH ] = 4.0 x 10^-3 M
pOH = -log (4.0 x 10^-3 M)
pOH = 2.39
pH = 14 - 2.39
pH = 11.61
The equation of the reaction is; [tex]NaOH + HCl ----- > NaCl + H2O[/tex]
Number of moles of NaOH = 0.40 M * 10/1000 = 0.004 moles
Number of moles of HCl = 0.20 M * 10/1000 = 0.002 moles
We can see that HCl is the limiting reactant
Mass of NaCl produced ;
0.002 moles * 58.5 g/mol = 0.117 g
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How many isomers of which type can be drawn to represent the chemical formula c5h12?.
3 structural isomers can be drawn to represent the chemical formula C5H12.
When two or more organic compounds have the same molecular formula but different structures, they are said to be structural isomers, also referred to as constitutional isomers. The two molecules below share the same chemical formula, however they are distinct due to variations in the methyl group's placement.
It is an alkane, C5H12. There are 2 to the power (n-4)+1 isomers of an alkane, where n is the number of carbon atoms. Therefore, there are three structural isomers that might exist for C5H12 using the formula. They are methyl butane, n-pentane, and isopentane (dimethyl propane).
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What is the chemical formula of quartz, calcite, hematite, pyrite, gold, and copper? which group of minerals do they belong to? what are the most common tests to differentiate calcite from quartz?
The chemical formulas and groups of the given minerals are as follow:
Quartz : Sio2 (Silicate)
Calcite : CaCO3 (Carbonate)
Pyrite : FeS2 (Sulfide)
Gold : Au (Native Elements)
Copper : Cu (Native Elements)
A piece of quartz can scratch a sample of calcite, however calcite can't scratch quartz. If you have a sample if each, attempt to scratch one sample with the other to look at the distinction in the hardness. You also can take a look at the hardness of these two minerals using a pocketknife.
Quartz is the second most abundant mineral in Earth's crust after feldspar. It occurs in nearly all acid igneous, metamorphic, and sedimentary rocks. It is an essential mineral in such silica-rich felsic rocks as granites, granodiorites, and rhyolites.
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Which compound in each of the following pairs of ionic substances has the most exothermic lattice energy?
The compound with the most exothermic lattice energy in each of the following pairs of ionic substances is Ca3N2.
What is Lattice energy?When ion pairs with opposing charges in the gas phase combine to create a solid, lattice energy is released.Lattice energy becomes weaker the lower you go in a group.As one descends a group, the atomic radius grows.As the atomic radius rises, the lattice energy falls because the force of attraction is inversely proportional to the square of the distance.As the charge's size rises, lattice energy rises as well.The product of the particle charges determines the force of attraction in a direct proportion.As a result, lattice energy rises as the charges do.Conclusion: The top of the Periodic Table will include the salts with the highest ionization energy and highest charges.To learn more about Lattice energy, refer to the following link:
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