examine the given beer's law standard curve for an unknown dye measured in a 1.0 cm cuvette. what is the concentration (in m) of a sample of the unknown dye with an absorbance of 0.32 at 542 nm?

Answer:

The answer is sophisticated earthquake early-warning systems, increasingly accurate storm forecasting, and innovative flood risk and flood mitigation projects provide communities with the tools they need to respond to impending hazard events, and infrastructure design and engineering improvements help to reduce the damage suffered

Explanation:

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The following molecules has an atom with an incomplete octet is BF₃.

the following molecules given as follows :

a) NF₃ - it follow the octet rule. all the atom present have there octet complete. the molecule is stable;

b) H2O - all the have complete octet.

c) AsCl₃ - all the atoms have 8 electron in valence shell and follow octet rule.

d) GeH₄ - thos molecule also follow the octet rule

e) BF₃ - not follow the octet and have incomplete octet. Boron atom have in complete octet.

thus, The following molecules has an atom with an incomplete octet is BF₃.

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A shorter, easier way to show chemical reactions, using symbols instead of words, is called a Chemical equation.

All the elements in chemistry have specific name and properties. Along with this, they all have a particular sign like Na for sodium, Ar for Argon and K for potassium.

Rather than writing the full name in words of the elements, we write only the symbols of the element along with the products and the reactants separated by using a arrow pointing towards products side.

For example,

Chemical reaction: Sodium hydroxide reacts with Hydrogen chloride to form Sodium chloride and water.

Chemical equation: NaOH + HCl → NaCl + H₂O.

So, as we can see from the example, the chemical equation is much more easier to understands and shorter.

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60 ml of a 14.0 M NH₃ stock solution are needed to prepare 200 mL of a 4.20 M dilute NH₃ solution.

Using the formula given below ,

M₁ x V₁ = M₂ x V₂

M₁ = concentration of stock solution

V₁ = volume of stock solution (to be found out)

M₂ = concentration of diluted solution

V₂ = volume of diluted solution;

V₁ = (M₂ x V₂) / M₁

= (4.2 x 200) / 14

= 60ml

Hence , 60 ml of a 14.0 Mole NH₃ stock solution are needed to prepare 200 mL of a 4.20 M dilute NH₃ solution.

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Answer:B

Explanation: according  to the law of electrostatics it states that  "unlike charge attract each other and like charges repel each other ".

The  spin quantum number will be 2 and 2.5 and multiplicity in each case will be 5 and 6.

The angular momentum of such an electron is described by its spin quantum number (ms). An electron carries orbital angular momentum in addition to angular momentum around its axis of rotation. The Spin Quantum Number (s) really does have a magnitude (1/2) and a direction (+ or -) since angular momentum would be a vector.

(i) If an atom has 4 electrons then it will have total

Total spin quantum number = 1/2+1/2+1/2+1/2 = 4/2=2

Multiplicity = 2S+1= 2×2+1=5

(ii)  If an atom has 5 electrons then it will have

Total spin quantum number = 1/2+1/2+1/2+1/2+1/2 = 5/2 = 2.5

Multiplicity = 2S+1= 2×2.5+1=6

Therefore, the spin quantum number will be 2 and 2.5

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The rate constant for the reaction is the relation between the concentration of the reactant and the chemical rate of reaction.

The rate constant of the chemical reaction is the proportionality constant  that describes the relationship between the concentration of the reactants and the chemical rate of reaction. The symbol of rate constant is k. Rate is depends on the temperature.  unit for the zero order reaction is : L⁻¹ s⁻¹. unit of rate constant for the first order reaction is : s⁻¹. unit for the rate constant for second order reaction is : mol⁻¹ L s⁻¹.

Thus, The rate constant for the reaction is the relation between the concentration of the reaction and the chemical rate of reaction.

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The molarity of a resulting solution is 0.707 mol/L

The molarity of a solution is defined by the amount of solute in moles divided by the volumes of solution in litres.

1 grams of ammonia is equals to 0.05872 mol

100 grams  of ammonia is equals to 5.872 mol

Molarity of a resulting solution would be = 100 gm of NH3 / 8.3 L of a solution.

That is 5.872 moles of NH3 / 8.3 of a solution.

Molarity of a resulting solution would be 0.707 mol/L of a solution.

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Answer:

50.8g of iodine is produced.

Explanation:

You have to do stoichiometry. To get grams of iodine produced.

(Remember to multiply across the top and divide by the bottom)

[tex]\frac{14.2g Cl2}{1} * \frac{1 mol Cl2}{70.9g} * \frac{1 mol I2}{1mol I2} * \frac{253.8g}{1 mol I2}[/tex]

Dendrochronology and seriation give the idea of the past events around us. Therefore, option B is the correct answer.

Dendrochronology is both an old and a modern science. Just counting tree rings sounds simple, but in the context of forest dynamics tree age is an important and valuable parameter.

     Calculating the years of the formation of tree gives us the idea of how old and strong that particular tree is. It is important in case of geology.

    For a long time, dendrochronology was associated with the dating of old houses, paintings, and archaeological samples. In recent decades however it has become a science with a broad range of applications such as global climate change, canopy process decline, the carbon cycle, and many others.

   Seriation, also called artifact sequencing, is an early scientific method of relative dating, invented by the Egyptologist Sir William Flinders Petrie in the late 19th century

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The correct option are option C,E that is bonds between a sulfur atom and two hydrogen atoms were broken.  Zinc atom formed a bond with one sulfur atom.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

In the give reaction, bonds between a sulfur atom and two hydrogen atoms were broken. zinc atom formed a bond with one sulfur atom.

Therefore, the correct option are option C,E.

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In the polysaccharide amylose,a large number of monosaccharides are linked together through alpha 1-4 glycosidic linkages.

Alpha 1-4 linkage is a stored form of sugar in plant. In this carbon atom 1 and 4 of the the two monomers forms a glycosidic bond. Polysaccharides are long chain forms of monosaccharides linked together by glycosidic bonds.A glycosidic bond is a covalent bond that joins a carbohydrate molecule to another group.this bond gives glycogen that is suitable for energy storage.

Amylose is plant starch made from monosaccharide connected through alpha 1-4 linkages.monosaccharides are the simplest form of sugar.from monosaccharides, all carbohydrates are built.

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At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.

The data given as follows :

The heat of sublimation of gallium = 277 kJ/mol

The heat of vaporization = 271 kJ/mol

The difference between the  heat of sublimation of gallium and the heat of vaporization is given as :

ΔH = heat of sublimation  -  heat of vaporization

ΔH = 277 kJ/mol - 271 kJ/mol

ΔH = 6 kJ/mol

The heat required = n ΔH

                              = 0.500 × 6

                              = 3 kJ

Thus, At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.

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volume of HCl would you need for the neutralization is 4 ml .

What is neutralization reaction  ?

In chemistry, neutralization or neutralization (see spelling difference) is a chemical reaction in which acids and bases react quantitatively with each other. When reacting in water, neutralization does not generate excess hydrogen or hydroxide ions in solution. The pH of the neutralized solution depends on the acidity of the reactants.

In the context of chemical reactions, the term neutralization is used for reactions between acids and bases or alkalis. Historically, this reaction was expressed as

Example:

HCl + NaOH → NaCl + H2O

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The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22  J / K mol.

The reaction is given as :

C (diamond)  + O₂   ----->  CO₂

At room temperature the value of S°  is given as follows :

C = 2.38 J / K mol

O₂ = 205.2 J/Kmol

CO₂ = 213.8 J/Kmol

The  standard entropy change is given as :

ΔS° = ∑S° product  - ∑ S° reactant

ΔS° = ( 213.8 ) - ( 2.38 + 205.2)

ΔS° = 213.8 - 207.58

ΔS° = 6.22  J / K mol

Thus, The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22  J / K mol.

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If you take 0.0072 grams, you should Penicillin dose for newborns is 7.2 mg per kilogram of body weight.

Infections brought on by bacteria are treated with penicillins. By eradicating the germs or stopping their growth, they function. Penicillins are available in numerous varieties. Different infections are treated with each differently.

To treat staphylococcal and streptococcal bacterial infections, penicillin is a common antibiotic that is administered. Penicillin is a member of the antibiotic class known as beta-lactams, whose members all work by preventing the growth of bacterial cells, which eventually results in bacterial eradication.

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Other natural therapies, such as salt water, can help soothe a sore throat. Gargling with salt water works well to destroy bacteria, reduce discomfort, and loosen mucus.

When you fix something that is broken or harmful, you enhance it. To correct the situation, a lot has been done inside. Synonyms include rectify, redress, and reform. More remedies' opposites.

The four primary categories of judicial remedies are (1) damages, (2) restitution, (3) coercive remedies, and (4) declaratory remedies. These categories are organized according to their intended use. Damages are typically used as a remedy to make up for any harm that has been done to the affected party.

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pH before addition of any KOH = 4.10

pH after addition of any KOH = 7.40

The quantitative measure of the acidity or basicity of aqueous or other liquid solutions is known as pH. In pure neutral (neither acidic nor alkaline) water, the concentration of hydrogen ions is 10⁻⁷ gram-equivalents per liter, which means a pH of 7. Solutions below pH 7 are acidic. Solutions of pH greater than 7 are basic or alkaline.

For the given question:

HClO ⇄ H⁺ + ClO⁻

Kₐ = 4 × 10⁻⁸

Kₐ = [H⁺ ][ClO⁻]/[HClO]

Let, [H⁺ ] = [ClO⁻] = x

Since [HClO] = 0.160 M

Then,

4 × 10⁻⁸ = x²/0.160

x = 8.0 × 10⁻⁵ M which is [H⁺ ]

pH = -log[H⁺ ]

pH = 4.10

Now initial moles of HClO = 0.05L × 0.160 mol/L

= 8 × 10⁻³ mol

Addition of 25.0 ml KOH adds 4 × 10⁻³ mol of KOH which reacts with HCl forming 4 × 10⁻³ mol ClO⁻ leaving 4 × 10⁻³ mol of HClO

Concentration [ClO⁻] =  4 × 10⁻³ mol / 0.0750L

= 0.0533M

Now,

Kₓ = 4 × 10⁻⁸

= [H⁺ ](0.0533)/(0.0533)

[H⁺ ] = 4 × 10⁻⁸

pH = 7.40

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The % ionization of a 2.00 m aqueous solution of the base is 0.0022%

What is pOH ?

It is a measure of the hydroxide ion (OH-) concentration of a solution. Therefore, it can be used as an indicator of the alkalinity of a substance and, in some cases, also as an indicator of electrical conductivity. pOH is the negative logarithm of hydroxide ion content and is given by the formula:

pOH = 14 - pH

OH = Kw /OH+

where Kw = self-ionization content of water.

Applying the logarithm on both sides, the more general form of the equation is: In relation to corrosion, pOH can be used as an indicator of electrolyte conductivity in galvanic cells. The conductivity of a solution depends on the concentration of ions that act as charge carriers. The higher the concentration of OH ions, the stronger the alkalinity, the higher the conductivity of the electrolyte, and the higher the rate of galvanic corrosion.

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Answer:Anaxonic Neurons

Explanation:

Answer:

Solubility is the best to dissolve

The mass of H₂SO₄ that must dissolved in 1.08 liters of solution to make 2.69M solution is 271.52 grams.

The molarity of the substance is defined as the number of moles of solute per unit volume of solution in liters.

In this case,

The volume of the solution is 1.08 L.

The required molarity of the substance is 2.69M.

So,

we can write,

Molarity = Moles/Volume

Moles = Molariyt x volume

Moles =2.69 x 1.03

Moles = 2.77

Moles = Mass required/molar mass.

Molar mass of H₂SO₄ is 98 g/mol.

Putting values,

2.77=Mass required/98

Mass required = 271.52 grams.

So, 271.52 grams of H₂SO₄ is required to make 2.69M solution.

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Helium(He) will have the highest electrical conductivity.

Magnesium (Mg) is a metal, so it is electrically conductive in nature, though not as much as hydrogen and helium.

Above certain temperatures, hydrogen(H) is also electrically conductive.

Helium(He) The ease with which an electric charge or heat can pass through a material is measured as conductivity. A conductor is a material that resists the flow of an electric current or thermal energy very little. Metals are generally good conductors of electricity.

Because chlorine(Cl) is a nonmetal, it has the lowest electrical conductivity.

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The number of dots in the Bohr Rutherford Diagram for sulphur-32 is equal to 16 as the dots represent the number of electrons and the sulfur atoms have 16 in its atom. Bohr Rutherford's Diagram of sulphur-32 is shown below.

Bohr's model described the atomic structure by explaining the electrons move in definite and fixed orbitals or electron shells.  Boh's model proposed that atoms contain a nucleus and the electrons surround this atomic nucleus.

Each orbit has fixed energy and the energy levels are represented with integer 1, 2, 3,.... and sometimes also represented as K, L, M, N...... shells.

When the electron moves from a lower energy level to a higher energy level then it absorbs energy and when the electron falls from a higher energy level to a lower energy level then it emits energy.

The atomic number of the sulfur atom is 16 so it has 16 electrons. Therefore, we can show 16 dots surrounding the nucleus in the Bohr-Rutherford Diagram.

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The conclusion would be that Rf value is wrong.

Rf value refers to the retention factor. It is used in Thin Layer Chromatography, which is the technique to identify molecules based on their polarity. The. rf value is the ratio of distance travelled by solute to the distance travelled by solvent.

Solute can not move faster than solvent, hence, the distance travelled is always less. This means that numerator will be less than denominator making it less than 1. In general, the rf value lies between 0 and 1. Therefore, there is something wrong in the experiment.

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Answer:

digestive system

.

Explanation:

Answer:

grams Sucrose = 0.0029214440066693 mole using the molecular weight calculator and the molar mass of C12H22O11.

Answer: 5.41 moles

N=m/M

  = 1850/12*12+22*1+16*11

N= 5.41 moles

The digital signal is a signal that encodes data as a series of discrete values; at any one moment, it can only take on a maximum of one of a finite set of values.

A digital signal, in contrast, represents continuous values; it always reflects a real number within a continuous range of values. Information is represented by simple digital signals in discrete analogue level bands. The same information state is represented by all levels in a band of values. The signal in the majority of digital circuits can have two legitimate possible values; this is known as a binary signal or logic signal.

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Peroxide is sprayed on all samples before any indicator so as to bleach the samples  before staining by the indicators

peroxide is any of a class of chemicals in which 2 oxygen atoms are linked together by a single covalent bond peroxide is useful in bleaching as they are agents bleaching.

The peroxide when applied to the sample it reduces color bodies in pulp by oxidizing the carbonyl group making the samples colorless.

When the indicator is applied to a sample that is bleached the indicator penetrates this highlights important features of the tissue as well as enhances the tissue contrast.

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