If the ph at the half-titration point of a monoprotic weak acid is 4. 2, what is the ka of the acid?.

Answer:

a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change

a catalyst is a substance that increases the speed of reaction by lowering the activation energy or providing an alternative pathway of a lower activation energy(more likely for enzymes in bio).

it also doesnt take part in the reaction but in chemistry, there are homologous and homogenous catalysts where some may take part in the rxn BUT they are regenerated and are not used up

chem: more particles will have the energy to overcome the activation energy, resulting in a higher frequency of effective collision, so the rate of rxn ↑. (usually catalyst is transition metal)

bio: enzyme-substrate complex, where it is essentially what happens in the chemistry part above but the conclusion is that it takes lesser time for nutrients to be broken down and therefore digested.

The correct option is (c) 101.55.

What is copper fluoride used for?

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The balloon is filled with 0.5L of air at sea level and submerged to a depth. Since, there is no change in the Temperature, the process is Isothermal. It is a process in which the temperature T of the given system does not change and remains constant. Hence, ΔT=0

Any system in which the temperature is kept constant is stated as an Isothermal Process. Since, in the given question, Temperature is not changing, hence we can consider it to be an Isothermal Process.

Given:

Pressure at sea level, P₁= 1 atm

Volume at sea level, V₁= 0.5L

Pressure at depth, P₂= 3.25 atm

Volume at depth, V₂= ?

Since, the process is Isothermal, hence,

∴ P₁V₁ = P₂V₂

⇒ 1 × 0.5 = 3.25 × V₂

⇒ V₂ = 0.5/3.25

⇒ V₂ = 0.154L

So, the Volume of balloon at the depth is 0.154L.

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The sequence of atomic numbers 1, 2, 3, and 4 denotes the periodic table's ordering of following elements.

Series are significant because they offer a possible point of entry. It's possible for a user to merely be aware of the fact that a publication is part of a specific series or to be searching for all publications in that series without being aware of any of the individual titles. The series could potentially be used as a storage and control system.

There are two ways to recognize elements in a series: The elements are in series if there are two and only two connections between them and a single node. When two elements' currents are determined to be similar by KCL at a node, the elements are in series.

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The approximate molar mass of lauryl alcohol is 183 g/mol.

As per Raoult's law:

[tex]T_b - T_s =KC m[/tex]

Tb = the freezing point of benzene (5.5oC), Ts = the freezing point of the solution, K = the cryoscopic constant (5.12 K*kg/mol for benzene), and Cm = the molality of the solution.

[tex]m_{l}[/tex]/M[tex]m_{s}[/tex] = [tex]C_{m}[/tex] where ml is the mass of lauryl alcohol and ms is the mass of the solvent.

[tex]T_b - T_s =KC m[/tex]=K[tex]m_{l}[/tex]/M[tex]m_{s}[/tex]

Therefore, M=[tex]\frac{Km_{l} }{(T_b - T_s)m_{s} }[/tex]=[tex]5.12*5/0.1(5.5-4.1)[/tex]=183 g/mol.

An organic substance called lauryl alcohol is created industrially from coconut or palm kernel oil. It is an alcoholic fat. The use of sodium lauryl sulfate and other sulfate esters of lauryl alcohol as surfactants is extremely common. In shampoos, sodium laureth sulfate, ammonium laureth sulfate, and sodium lauryl sulfate are all utilized. Lauryl alcohol has a floral scent and is flavorless and colorless. In addition to being a flavor-enhancing food additive, lauryl alcohol is also used to create medicines, lubricating lubricants, surfactants, and monolithic polymers.  Lauryl alcohol is a kind of emollient used in cosmetics.  Lauryl alcohol, a significant scent, and 1-bromododecane, an alkylating agent used to increase the lipophilicity of organic molecules, are both precursors to Lauryl alcohol.

A solution of 5. 00 g of lauryl alcohol in 0. 100 kg of benzene freezes at 4. 1°c. what is the approximate molar mass of lauryl alcohol?

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Answer:

pH = 4

Explanation:

pH is a base 10 logarithmic scale

  1000 = 10^3

        7 -3  = pH = 4  

Answer:

It’s sexual, and the offspring are genetically different from the parents

Explanation:

Since it is the same flower the bee is pollinating, the progeny will be genetically distinct if the bee were to transfer the pollen to the female part of the flower from the male part.

The 6 M solution NaOH solution diluted before titrating the vinegar sample because pH at the equivalence point changes very rapidly . It is very useful to have dilution solution , so that number of moles that are transferred per drop of the solution is low . So, pH change smaller amount per drop. Having more dilute solution also allows the titration to use volume that is easier to work with.

If you used the 6 M solution was used then the volume required for titration would go down by a factor of 6/0.3 = 20

This means that if a titration took 20ml of the 0.3 M solution then it would take 1ml of the NaOH solution.

Titration consists of adding a controlled and known amount of standard solution with an unknown until the reaction to be complete.

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In the polymerization reaction, the lone pair electrons on the NH₂ groups of hexanediamine attack the C=O groups of the dicarboxylic acid in a nucleophilic substitution reaction as shown in the image.

Hydroxide is added to remove any H⁺ ions present and keep the hexanediamine in the deprotonated form, so that the NH₂ lone pair electrons are available for reaction.

If hydroxide is not added, the NH₂ groups will get protonated by H⁺  ions present to give NH₃⁺ groups, which cannot react.

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The intermolecular forces are present between the molecules and allow their interactions. The ion-dipole force is present between the water and the chloride ion.

Ion-dipole intermolecular forces are present when the molecules have an ion and a neutral molecule that can interlink through an electrostatic attraction. These forces are present in solutions.

The chloride ions have a negative charge, whereas the water molecule has a neutral charge. Water is a polar molecule that has a partial negative and positive charge that can bond with the anion (chloride ion).

Therefore, the water and the chloride ions have ion-dipole intermolecular forces.

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The hypothesis should be; "Increasing the amount of ice increases the rate at which the ice will melt"

The term hypothesis refers to a tentative explanation that could be applied in order to explain an observation. When we give a hypothesis, it must be subjected to rigorous experimentation thus it can be confirmed or repelled by experiment.

Now, we can see that the question here is; "How does the amount of salt added to ice affect the rate at which the ice will melt?" This implies that the correct hypothesis here ought to have to do with the impact of the amount of ice in the affirmative.

Thus, the hypothesis should be; "Increasing the amount of ice increases the rate at which the ice will melt"

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Oxidation is "Increase in oxidation number" as well as loss of electrons.

A rise in oxidation number results from the loss of negative electrons, whereas a reduction in oxidation number results from the gain of electrons. As a consequence, the oxidized element or ion experiences a rise in oxidation number.

As a result of losing electrons in the process, a reactant oxidizes. When a reactant obtains electrons during a reaction, reduction takes place. This frequently happens when acid and metals react.

Therefore, Oxidation is "Increase in oxidation number" as well as loss of electrons.

Hence, the correct answer will be option (e)

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The main problem is the release of heat and thereby reducing yield of Ammonia.

Chemical equilibrium is defined as the state of a reversible chemical reaction where there is no change in net amount of products and reactants involved in it.

What is an exothermic reaction?

Exothermic reaction is one of the chemical reactions that will produces heat during the formation of products.

At the chemical equilibrium, the chemical reaction will be as follows:

[tex]N_{2}[/tex] + 3[tex]H_{2}[/tex] → 2[tex]NH_{3}[/tex] + energy

The above chemical equilibrium equation indicates that energy will be released due to the reaction of nitrogen and hydrogen. The energy release increases the surrounding temperature and thereby it will reduce the yield of the ammonia. Thus it can be indicated as the major problem.

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Answer:

Sodium hydroxide and water will react at room temperature. What does this indicate about its activation energy? The activation energy is at exactly 600 kJ. C. The activation energy is very low.

Explanation:

 overall equation is ,

2FeSo4+heat→Fe203+SO2+SO3

Decomposition reaction is when Reactant break down into simpler parts .

For decomposition reactions require energy input. The decomposition reaction happens in our everday life. The process of digestion food is a type of decomposition ,where breakdown of food from larger to smaller particles and large amount of energy release.

The decomposition is classified into

*thermolysis

*Electrolysis

*photolysis

The overall equation will be

2FeSo4+heat→Fe2O3+SO3+So2

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The IUPAC names of the given compounds are 3-methylpentane, 1,3-butadiene, 1,3-dimethylcyclohexane, 2,3,5,5-tetramethyl-1,3-hexadiene, and 2,2-dimethylpentane respectively.

Thus, following the IUPAC nomenclature rules the name of the given compounds are as follows:

3-methylpentane

1,3-butadiene

1,3-dimethylcyclohexane

2,3,5,5-tetramethyl-1,3-hexadiene

and 2,2-dimethylpentane

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The Henderson-hasselbalch equation for a propanoic acid solution is expressed as [A-]/[HA] = 2.7.

It is expressed as:

pH = pKa + log([A-]/[HA].

where,

[A-] is molar concentration of conjugate base and

[HA] is molar concentration of weak acid.

Given,

pH = 5.30

Substitute the value in the Henderson Hasselbalch equation

5.30 = 4.874 + log[A-]/ [HA]

log[A-]/[HA] = 5.30 - 4.874

[A-]/[HA] = 10^ 0.426

[A-]/[HA] = 2.7

Thus from the conclusion we can say that The henderson-hasselbalch equation for a propanoic acid solution is expressed as [A-]/[HA] = 2.7.

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Answer:

You can separate a mixture of sand, salt and water by decantation and evaporation. Decantation will separate sand from salt and water. Sand remains in the original vessel, whereas salt and water is transfered to new vessel. Evaporation will separate salt from water.

Organic molecules (amino acids) needed to be concentrated to stimulate reactions to form proteins concentration mechanisms do not include Boiling Stones.

Amino acids organic compounds. Amino acids are building block of life these are the molecules which combine to form proteins. Amino acids contain the amino functional group that is -NH₂ and carboxyl functional group that is -COOH.

Example: Glycine, Alanine etc.

Thus from the above conclusion we can say that Organic molecules (amino acids) needed to be concentrated to stimulate reactions to form proteins concentration mechanisms do not include Boiling Stones.

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Answer:

Water and Salts

Explanation:

Hope it helps u....

It is important to know if a substance is a molecular compound or an ionic compound because the boiling and freezing points of a solvent are colligative properties, and they depend on the solute particles.

Molecular compounds are pure things called that are created when atoms are joined by the sharing of electrons. Ionic compounds are formed by transferring electrons between the elements.

It is important to know the type of compounds before predicting because the more the solute particles the more the freezing point and lower the boiling points. And it tells how much amount f solute will be fine in the solvent.

Thus, knowing if a material is a molecular or ionic compound is crucial since a solvent's boiling and freezing temperatures are collaborative features that are dependent on the solute particles.

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Lithium metal reacts with nitrogen gas to form lithium nitride the balanced chemical equation will be 6Li + N₂ → 2Li₃N.

In a balanced chemical reaction, the number of moles that are present at the side of the reactant must be always equal to the side of product formation this is known as a balanced chemical equation.

The balanced chemical reaction will be 6Li + N₂ → 2Li₃N.

Here 6 moles of lithium is reacting with one nitrogen but as it is in gaseous state it is N₂ after reacting with lithium it will give two moles

Therefore, balanced equation will be 6Li + N₂ → 2Li₃N

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Leucine and methionine are the amino acids formed using the n-phthalimido malonic ester synthesis.

The steps involved in phthalimido malonic ester synthesis:

Step 1: Deprotonation To Give An Enolate

In the first step, a base (CH3O– in this case) removes the most acidic proton from the ester (on C2 here, with a pKa of about 13) to give an enolate. The resulting enolate can be drawn as one of two resonance forms.

Step 2: SN2 Reaction Of The Enolate Nucleophile With An Alkyl Halide Electrophile.

Enolates are great nucleophiles. In the second step, the enolate acts as a nucleophile in an SN2 reaction to form a new C-C bond.

Step 3: Acidic Ester Hydrolysis

Acid and water are added to perform the aqueous hydrolysis of the ester to a carboxylic acid.

Step 4: Decarboxylation To Give An Enol

When carboxylic acids have a carbonyl group (C=O) two bonds away, they can readily lose carbon dioxide, because the carbonyl can act as an electron “sink” for the pair of electrons coming from the breaking C–C bond, forming an enol. This is called “decarboxylation”. Note how this is also the case for carboxylic acids with a ketone two bonds away, so-called “β-keto acids”.

Step 5: Tautomerization Of The Enol Back To The Carboxylic Acid

The enol that is formed is not a stable species. It can undergo transformation into its constitutional isomer: in this case, a carboxylic acid. These two constitutional isomers are in equilibrium with each other, although the “keto” form (with the carbonyl group) is greatly favoured. This process is called "tautomerism".

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If you were given the the total # of grams of all three compounds with the % of each molecular compound - H2O, CO2 and sugar [you would need to know the type of sugar in the Pop such as C12H22O11 as to find its MM (molar mass)]

To begin take the % of each compound x the total grams of all the compounds. For illustrative purposes let's say it works out to be 50 grams of H2O in the POP. The same would be. done for CO2 and for the sugar.

Step 1) With the mass of each you could determine the # of moles of each:

Example if the number grams of water in the sample is 50g, to determine the # of moles of water you would do the following - 50g H20 x 1 mol/18g H20 = 2.8 mol H2O The same technique would be used for the other compounds to find the # of moles.

Step 2) To find the representative particles of each(molecules, atoms) you would do the following:

as the example given of above for H20 - 50 grams you calculated as shown above to be the number of mol of H20 = 2.8mol

From the number of mol of H20, to determine the # of molecules of water you would set up the following:

2.8 mol H20 x 6.02 x 10^23/1 mol H2O = 1.69 X 10^24 molecules of H20.

The same would be done for CO2 and the sugar.

Step 3) Now to find the number of atoms of element of the compound taking for example the H2O example above:

Take the # of molecules of H2O found above and set it up in the following manner:

1.69 X 10^24 molecules H2O x 2 atoms H/1 molecule H2O = 3.38 x 10^24 atoms H

1.69 x 10^24 molecules H2O x 1 atom O)/1 molecule H2O = 1.69 X 10^24 atoms O

The same would be done for CO2 and for the sugar compound.

The two effects do impurities have on the melting point of an organic compound are given as ,

The impurities decreases the melting point of the substance of organic compounds . This is because there are unwanted  particles which weaken the lattice structure of the  solids crystal due to which it become less stable and melts before its original melting point.

Example : Let take a clay and add dirt hen it breaks easily from the points where there is dirt . This is essentially what happens with impurities

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The major product is p-bromo N,N,N -trimethylaniliniumiodide when p-bromoaniline react with excess CH₃I.

When p-bromoaniline react with methyl iodide it produces p-bromo N,N-dimethylaniline.

When  p-bromo N,N-dimethylaniline reacts with excess methyl iodide leading to the production of p-bromo N,N,N -trimethylaniliniumiodide.

Thus from the above conclusion we can say that The major product is p-bromo N,N,N -trimethylaniliniumiodide.  when p-bromoaniline react with excess CH₃I.

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The covenant of further assurances requires the grantor to execute any necessary legal documents (within his power) necessary to fix title defects discovered after closing.

A warranty deed is typically signed by both parties when a seller transfers real estate to a buyer. According to Deed Claim, this document certifies that the seller is the legitimate owner of the property and is selling it free of any liens while transferring the legal title to the buyer. The assurances made by the seller are represented by the six covenants of title. Three covenants are regarded as existing covenants, and as such, they are applicable to the parties to the most recent transfer. The other three are future covenants, and if they are broken, any owner may bring a claim against any prior grantor.

Covenant of Seisin

The seller's rightful ownership of the property is guaranteed by the present covenant of seisin.

No Encumbrances

The seller guarantees that the property is possessed free and clear by making the current covenant against encumbrances.

Right to Convey

According to TheLaw.com, having the right to convey indicates that the seller is legally permitted to transfer the property to the buyer.

Quiet Enjoyment

The future covenant of quiet enjoyment guarantees that a third party's legal claim to title won't affect the buyer's right to possession.

Covenant of Warranty

The warranty covenant and the quiet pleasure covenant are extremely similar.

Further Assurances

This prospective covenant is a guarantee that, should the need ever arise, the grantor will take all reasonable steps to assist the grantee in perfecting the title.

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Excess alcohol is removed by Vacuum filtration.

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The same amount of energy is released when they recombine.

Like energy components, electrolyzers comprise of an anode and a cathode isolated by an electrolyte. Different electrolyzers capability in various ways, fundamentally because of the different kind of electrolyte material included and the ionic species it conducts.

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