A 0.4042 g sample of a pure soluble bromide compound is dissolved in water, and all of the
bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of
the resulting AgBr is found to be 0.6797 g.
What is the mass percentage of bromine in the original compound?
%

The given reaction sequence suggests the use of PPh3 followed by BuLi to form a nucleophilic species that can react with 3-pentanone and Br.

The first step involves the formation of a phosphonium ylide intermediate by the reaction of PPh3 with BuLi. In the second step, the ylide acts as a nucleophile and attacks the carbonyl group of 3-pentanone to form a betaine intermediate. The final step involves the reaction of the betaine with Br to give the desired product.

The major organic product formed in this reaction sequence is (E)-1-bromo-3-(phenyl(phenyl)methylidene)butan-1-one. This is because the reaction proceeds via an SN2 mechanism, which leads to the formation of an alkene with an E configuration. The systematic IUPAC name of the product is (E)-1-bromo-3-(phenyl(phenyl)methylidene)butan-1-one.

In this name, "E" indicates the configuration of the double bond, "1-bromo" indicates the presence of a bromine atom on the first carbon, "3-(phenyl(phenyl)methylidene)" indicates the presence of a substituted phenyl group attached to the third carbon, and "butan-1-one" indicates the presence of a ketone group on the first carbon of a four-carbon chain.

What is the major organic product in the following reaction sequence? Type its systematic IUPAC name in the box below.

1) PPh3

2) BuLi

3) 3-pentanone

Br?

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Answer:

D.  0.4 (mol/L)/S

Explanation:

You simply have to plug in the given values into the rate law.

Rate = k[A][B]

Rate = (0.1)(1)²(2)²

Rate = (0.1)(1)²(4)²

Rate = 0.4

According to the stoichiometry of the reaction, 4 moles of H3PO4 are formed from 1 mole of P4O10. Therefore, the number of moles of H3PO4 produced from 0.0916 moles of P4O10 is

mol H3PO4 = 4 x mol P4O10

moles H3PO4 = 4 x 0.0916 moles

Moles of H3PO4 = 0.3664 moles

Finally, the mass of H3PO4 produced can be calculated from its molar mass.

mass of H3PO4 = moles of H3PO4 x molar mass of H3PO4

Mass H3PO4 = 0.3664 mol x 98.0 g/mol

Mass of H3PO4 = 35.92 g

Therefore, the maximum mass of phosphoric acid that can be produced from 26.0 g P4O10 and 14.6 g H2O is 35.9 g H3PO4.

What is stoichiometry in chemistry?

Stoichiometry, in chemistry, the determination of the proportions in which elements or compounds react with each other. The rules followed in determining stoichiometric ratios are based on the law of conservation of mass and energy and the law of combining weight or volume.

Why is it called stoichiometric?

Stoichiometry is the study of quantitative or measurable relationships that exist in chemical formulas and chemical reactions. The term is derived from the Greek stoikeion for element and metron for measurement.

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Answer:

wow 15 points is alot

Explanation:

Answer: 0.814 M MgS

Explanation:

I am assuming that 34.1 is in Grams if not this answer is propably not correct.

34.1 g MgS / 56.369 MgS(molar mass from Periodic table) = 0.605 moles

Molarity - moles / Liter

M= 0.605 / 0.743 Liter =0.814 M

At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

Answer: One methane molecule, CH4, contains one carbon atom and four hydrogen atoms.

Explanation:

Answer:

The gas is Methane at 340K

Answer:

acidic

Explanation:

As concentration is given we can find out pH using -log(concentration)

So input, -log(2.27X10^-3) and it gives us 2.644 (appx.)

according to the pH chart, pH value lesser than 7 refer to acidic substances. pH value 7 means neutral and pH value higher than 7 means basic. As 2.644 is less than 7, so it is acidic.

According to the problem, we need to determine whether new catalyst B would give higher yields than old catalyst A. The given data is a paired sample, because both the catalysts were experimented on 6 different batches of raw materials.

(a) Explain the experimental design.

Here the data collected is from 6 different raw materials, which were divided into two portions. Therefore, two data were obtained for each of the 6 raw materials, which implies in scientific terms that repeated data was obtained for each of the 6 raw materials. Thus, this type of design is known as Repeated-Measures Design.

(b) Carry out the appropriate t test.

For testing whether the new catalyst B will give higher yields than old catalyst A, a Paired-Sample t-test needs to be performed. The test will be performed using R Studio. The R codes and output are as below.

R CODE

# Load the Data A <- c(9,19,28,22,18,8) B <- c(10,22,30,21,23,12)  # Paired Sample t-test t.test(A,B,paired = TRUE,alternative = "less")

R OUTPUT

# Paired Sample t-test > t.test(A, B, paired = TRUE, alternative = less) Paired t-test = data: A and B t = -2.6458, df = ">

The decision rule for this test is: "If the p-value < 0.05, then reject the null hypothesis, under 0.05 level of significance; otherwise accept the null hypothesis".

Decision: As p-value (= 0.02283) < 0.05, so we decide to REJECT the null hypothesis, under 0.05 level of significance.

Conclusion: As the null hypothesis is to be rejected, so we can conclude that "there is sufficient evidence conclude that the new catalyst B gives a higher yield than old catalyst A".

(c) Construct a 95% confidence interval for the difference between catalysts A and B.

From part (b),

we have obtained the R output about the 95% confidence interval for the difference between catalysts A and B as:

Therefore, the 95% confidence interval for the difference between catalysts A and B is (-∞, -0.56).

In frequency statistics, the confidence interval (CI) is the range of estimated values ​​for an unknown parameter. Confidence intervals are computed at the specified confidence level. A 95% confidence level is the most common, but other levels such as 90% and 99% are sometimes used . The confidence level represents the proportion of corresponding CIs over time that contain the true value of the parameter. For example, 95% of all intervals computed at the 95% level must contain the true value of the parameter.

Factors that affect the width of the CI include confidence level, sample size, and within-sample variability.  All other things being equal, the larger the sample, the narrower the confidence interval. Similarly, the more varied the sample, the wider the confidence interval, and the higher the confidence level, the wider the confidence interval.

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Option (c) is correct. CH3–CH=CH–CH3 show cis- trans isomerism. This is cis,trans-but-2-ene.

Cis- trans isomerism exhibit a type of stereoisomerism where the atoms have different spatial arrangements in three-dimensional space. Cis - trans isomers are also known as geometrical isomers or configurational isomers.  Cis indicates that the functional groups are on the same side of the carbon chain and trans indicates that the functional groups are on the opposite side of the carbon chain. Alkenes of the type R–CH=CH–R can exist as cis and trans isomers. cis if the two R groups are on the same side of the carbon-to-carbon double bond, and trans if the two R groups are on opposite sides of the carbon-to-carbon double bond. the compounds  cis, trans-but-2-ene.

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The representation is showing potassium atom (K) and Chlorine atom (Cl) when it ought to show their ions i.e potassium ion (K⁺) and Chlorine ion (Cl¯)

When potassium chloride, KCl dissolves in water, it dissociate to produce potassium ion (K⁺) and Chlorine ion (Cl¯) as shown below:

KCl(aq) —> K⁺(aq) + Cl¯(aq)

The representation given in the question is only showing potassium atom (K) and Chlorine atom (Cl). This makes it wrong as dissolution of ionic compounds in water will results in the corresponding ions of the element that makes up the compound

Please see attached photo

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In Atlanta, GA, certain seasons are associated with poorer air quality due to various factors such as weather conditions, human activities, and geographical location.

Typically, the seasons with the worst AQI in Atlanta, GA, are summer and early fall. This is primarily due to the combination of high temperatures, stagnant air masses, and increased pollution from various sources.

During the summer months, Atlanta experiences hot and humid weather, which can contribute to the formation of ground-level ozone. Ozone is a harmful pollutant that is created when pollutants from vehicles, power plants, and industrial activities react with sunlight and heat. High levels of ozone can cause respiratory issues and other health problems.

In addition to ozone, Atlanta also experiences increased levels of particulate matter (PM) during the summer and early fall. PM refers to tiny particles suspended in the air, which can come from sources such as vehicle exhaust, industrial emissions, and wildfires.

These particles can be inhaled into the lungs and can have detrimental effects on respiratory health.

It's important to note that air quality can vary from year to year and is influenced by various factors. Local regulations, weather patterns, and changes in pollutant emissions can all impact the AQI during different seasons.

Monitoring air quality reports and taking necessary precautions such as reducing outdoor activities during times of poor air quality can help individuals stay informed and protect their health.

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The United States experienced a decrease in the real GDP, high inflation, and arising unemployment rate.

The United States appeared to be entering a recession.A recession is a decline in economic activity, characterized by declining GDP, high unemployment rates, and increased unemployment benefits. Economic analysts and the media commonly use a two-quarter consecutive decline in real GDP as a definition of a recession.

The United States is considered to have entered a recession in the 1970s, which was characterized by an energy crisis, inflation, and recession. However, by the end of the decade, the economy had improved, and it entered into the 1980s with a strong economic performance.

The 1970s were a period of high inflation, low growth, and an oil crisis, which had a significant impact on the United States economy. Therefore, it can be concluded that The United States was in the middle of an economic boom before the 1970s recession and entered a recession in the 1970s due to a decrease in the real GDP, high inflation, and arising unemployment rate.

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N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the  MO structure of NO+ different than that of N2.

The molecular orbital is formed by the combination of atomic orbitals. We should note that the number of molecular orbitals must be equal to the number of combining atomic orbitals.

Now we know that N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the  MO structure of NO+ different than that of N2.

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The mass percent of sulfur in the sample  (CH₂N₂SO₂)  is 30.2 %.

The mass percentage is used to explicitly the concentration of a solution while the mass of a solute and the mass of an answer are given:

Calculation:-

given mass of the sample (CH₂N₂SO₂)  is = 106 g

mass of sulfur = 32 g

Mass percentage=Mass of Sulphur / Mass of the compound.

                            = 32g / 106 g × 100

                            = 30.2 %

Mass percent composition is calculated by evaluating the molar mass of detail in a compound to the overall molar mass of the entire compound. The very last calculation yields a percentage this is beneficial while evaluating numerous compounds with one another.

This component enables the showing of the lowest whole range of moles and the relative quantity of atoms of every element in a compound. With the assistance of the empirical system, chemists can also calculate the actual molecular formula. This formulation indicates the exact range of atoms inside the compound.

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Answer:

c

Explanation:

1 \(cm^{3}\) = 1 mL

20,6 mL = 20,6 \(cm^{3}\)

Answer:

C-20.6 cm^3

Explanation:

Cubic centimeters directly correspond to mL. Thus the answer would be the same as the mL

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

It would take 15 sticks of butter

Explanation:

2 divided by 20 is 0.1

0.1 is how much butter for 1 so now we multiply that by 150

0.1 x 150 = 15

Therefore, you would need 15 sticks of butter for 150 cookies

Explanation:

In a covalent bond the electrons are simultaneously attracted by the two atomic nuclei.

In a covalent bond the electrons are; simultaneously attracted by the two atomic nuclei.

Covalent bonding can be defined as the sharing of electrons between two atoms.

The Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.

We know that

Polar covalent bond is defined as a chemical bond in which electrons are shared unequally or unevenly between two atoms.

Non-polar covalent bond is defined as a chemical bond in which electrons are shared evenly or equally between two atoms.

Therefore, In a covalent bond the electrons are; simultaneously attracted by the two atomic nuclei.

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The molarity of aqueous lithium bromide, LiBr solution is 0.2 M

We'll begin by calculating the number of mole of Pb(NO₃)₂ in the solution.

Mole = Molarity x Volume

Mole of Pb(NO₃)₂ = 0.25 × 0.01

Mole of Pb(NO₃)₂ = 0.0025 mole

Next, we shall determine the mole of LiBr required to react with 0.0025 mole of Pb(NO₃)₂

Pb(NO₃)₂ + 2LiBr —> PbBr₂ + 2LiNO₃

From the balanced equation above,

1 mole of Pb(NO₃)₂ reacted with 2 mole of LiBr.

Therefore,

0.0025 mole of Pb(NO₃)₂ will react with = 2 × 0.0025 = 0.005 mole of LiBr

Finally, we shall determine the molarity of the LiBr solution

Molarity = mole / Volume

Molarity of LiBr = 0.005 / 0.025

Molarity of LiBr = 0.2 M

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Electronegativity and Ionization energies are similar because they both explain the interactions between an atomic nucleus and electrons.

However, they are different because electronegativity explains the attraction of electrons while the ionization energy is about the removal of electrons from an atom.

Answer:

C. Chemical change

Explanation:

A physical change is where something is changed but it doesnt affect the build up of the chemical. For example, if you broke sticks and threw them on the ground, that would be a physical change because the change is happening to the physical being of the object and not its chemical buildup. However, if you lit those sticks on fire, that would be considered a chemical change because you end up with two substances, ash and the remnants of the stick. A nuclear reaction would result in something blowing up so its not that. And a physical property is like what it looks like or how it smells. Hope I helped you!

Answer:

\(Ka=7.73x10^{-5}\)

Explanation:

Hello!

In this case, since the pH is measure of the amount of hydrogen ions in solution, first given the pH we can compute the concentration of hydrogen ions via:

\(pH=-log([H^+])\)

\([H^+]=10^{-pH}=10^{-2.353}=4.436x10^{-3}M\)

Thus, since the ionization of the given acid, leads to the following equilibrium expression as it is a weak one:

\(Ka=\frac{[H^+][A^-]}{[HA]}\)

We notice the concentration of hydrogen ions equal the concentration of the acids conjugate base, so we can compute:

\(Ka=\frac{4.436x10^{-3}*4.436x10^{-3}}{0.259-4.436x10^{-3}}\\\\Ka=7.73x10^{-5}\)

Best regards!

Thickness of the fail in millimeter is 0.051mm

Thickness is the quality or state of being thick

Here given data is

aluminum(Al) =  24cm by 31cm

Mass =10.35g

Density = 2.70gcm³

We have to find the thickness of the fail in millimeter = ?

So the formula is

thickness = Volume/surface area

So first we have to calculate volume

Volume = mass/density

Volume = 10.35g/ 2.70gcm³

Volume = 3.83

Then the area of foil is

Area = 24cm×31cm

Area = 744cm²

Thickness = volume/area

Thickness = 3.83/744cm²

Thickness = 0.0051cm = 0.051mm

Thickness of the fail in millimeter is 0.051mm

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Answer: A) The amount of product measured after a reaction

A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct

Yield of any chemical reaction gives idea about the amount of product that is produced by the chemical reaction between reactants.

Actual yield gives idea about the how much yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.

Therefore, A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct

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