3. Copper (II) sulfide (CuS) is formed when 48.2 grams of copper are added to 35.0 grams of
sulfur.
Which reactant is the limiting reagent?
How much product is formed?
How much excess reagent remains?
(9 pts. total / 2 pts. for equation - 4 pts. for stoich - 2 pts. for limiting reagent - 1 pt. for excess
reagent.)

The capacity of the electronegative leaving group to activate the carbonyl is connected to the relative reactivity of carboxylic acid derivatives toward nucleophile replacements. The carbonyl's electron density was taken from it by the more electronegative leaving groups, enhancing its electrophilicity.

ROCl (Acid Chloride) is the most reactive derivative of carboxylic acid.

The substituent becomes more electrophilic and reactive if it is electron withdrawing.

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The classifications of the substances are;

Atomic element - Ag

Molecular element - [tex]F_{2}[/tex]

Molecular compound - CO

Ionic compound - [tex]PbI_{4}[/tex]

We know that a compound can be obtained any time that there is a combination of the elements. As the elements are combined, we know that are able to know the sort of compound that can be formed.

If the compound that is formed is such that there are ions and the compound can be able to dissolve in solution, we say that the compound is ionic. If on the other hand, we have a compound that can not be dissolved in water and remains as a molecular without breaking up to form ions, we say that the compound is a molecular compound.

A molecular element has to do with a kind of molecule that is made up only one kind of element such as the molecules that involves the halogens.

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The answer is 39.2%.

Solution:

[tex]Yield = \frac{Observed yield}{Theoritcal yield}*100[/tex]

= [tex]\frac{4.0}{10.2} *100[/tex]

= 39.2%.

Theoretical yields are calculated based on the stoichiometry of the chemical formula. Actual yield is determined experimentally. Percent yield is determined by calculating the ratio of actual yield to theoretical yield. how much usable product is obtained after processing; how much crude product is actually ordered.

However, in practice, the actual product yield is almost always lower than the theoretical yield. The actual yield is the amount of product actually obtained and the theoretical yield is the maximum possible yield. There are several reasons why percentage returns may not be 100%. This is because some other unexpected reaction occurred that did not produce the desired product.

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The new volume can be find out by the Boyle's law. The volume changes from 250 ml to  83.3 ml at a pressure of 3 atm.

Boyle's law states that at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas.

Thus, PV= a constant.

Let P1 and V1 be the initial pressure and volume and P2, V2 be the final amounts. then:

P1 V1 = P2 V2.

Given the initial pressure = 1 atm

volume = 250 ml

final pressure = 3 atm

final volume V2 =  P1 V1/ P2

= (1 atm × 250 ml)/ 3 atm

= 83.3 ml.

Therefore, the final volume is 83.3ml.

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The element that is an inner-transition, actinide, AND a trans-uranium element is Lawrencium. Lr

Option B is correct.

The trans-uranium elements are described as the chemical elements with atomic numbers greater than 92, which is the atomic number of uranium.

The trans-uranium elements  are unstable and decay radioactively into other elements.  The trans-uranium elements do not occur naturally on Earth and are synthetic except with the exception of neptunium and plutonium.

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Using their condensed structural formulas, the rank of homologous series for the given set of alkanes by their boiling point is as:

Heptane (C₇H₁₆) > hexane (C₆H₁₄) > 3,3-dimethylpentane (C₇H₁₆) > butane (C₄H₁₀)

The alkane homologous series' members should have higher boiling points as we move down the group. For example, it is expected that butane will have a greater BP than ethane. We will also consider the presence of branch chain alkane because it also affects the boiling point. Due to the larger van der Waals forces between adjacent molecules in straight-chain alkanes, their boiling points are higher. By considering the above properties the sequence will be as:

Heptane (C₇H₁₆) > hexane (C₆H₁₄) > 3,3-dimethylpentane (C₇H₁₆) > butane (C₄H₁₀)

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Answer: You would expect to see the ions turn into metal.

Hope this helps :)

Explanation:

Metal ions in their reduced form are the metal in their elemental phase. If you have a solution containing metal ions and they are reduced, you will notice the metal deposition.

Two of O atom, two of H atom on both sides. The reduction of gaseous oxygen to aqueous hydrogen peroxide,when this reaction in acidic aqueous solution, and we need to balance H on both sides .

O2 (g) → H2O2 (l)

O2(g) + H+(aq) → H2O2(l)

O2(g) + 2H+(aq) → H2O2(l)

now, we need to balance 2 positive charge of 2H+ so, we will put 2 e- on left side:

O2(g) + 2H+(aq) + 2 e- → H2O2(l)

this is the final balanced equation which has equal no. of atoms on both sides:

2 of Oxygen atom, 2 of Hydrogen atom on both sides.

A first-order reaction can be defined as, a chemical reaction in which the reaction rate is linearly dependent on the concentration of one reactant. In other words, a first-order reaction is a chemical reaction in which the rate varies on the changes in the concentration of one of the reactants.

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Answer:

Yes

Explanation:

Molarity is the amount of moles of a solute per every 1 liter. It can be expressed in the units moles/L or simplified to M.

There are 6 possible arrangements for 3 one-dimensional oscillators using 2 quanta.

A collection of circumstances, typically involving temperature and pressure, is referred to as a thermodynamic state and it determines how a bulk material behaves. A stipulated is a single possible configuration of the locations and kinetic energy of all molecules present in the sample; it is a record of the positions and velocities at a certain moment.

Therefore, if there are three one-dimensional oscillators, there are three locations for which we may work (0000), and if there are three quanta, we are dealing with two digits that we can divide in many ways.

Our combos are (2, 0, 0), (0, 2, 0),(0,0,2) (1, 1, 0), and (1, 0, 1). (0,1,1).

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The answer is CoA and 10μmol due to which additional CO₂ is produced.

Acetaldehyde is converted to ethanol with the help of the reaction catalyzed by alcohol dehydrogenase. This reaction results in the production of NAD+. The produced NAD+ is used to process the pyruvate dehydrogenase reaction, where additional CO₂ is also produced when pyruvate is converted to acetyl CoA.

10 μmol

10 micromoles of acetaldehyde are required to allow complete oxidation reaction of the pyruvate to 15μ moles of CO₂.

This above can be explained with the explanation that by adding additional alcohol dehydrogenase and its substrate we are actually allowing regeneration of NAD+. This is the reason why the presence of oxidized NAD+ the additional TCA reactions will take place and produces additional CO₂. So we will be getting 15 micromoles of pyruvate oxidized for 10 micromoles of acetaldehyde.

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Taking into account the reaction stoichiometry, the correct answer is the second option: a mass of H₂ of 1.10 grams is required to react with 8.75 g of O₂.

In first place, the balanced reaction is:

O₂ + 2 H₂  → H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 32 grams of O₂ react with 4 grams of H₂, 8.75 grams of O₂ react with how much mass of H₂?

mass of H₂= (8.75 grams of O₂×4 grams of H₂) ÷32 grams of O₂

mass of H₂= 1.10 grams

Finally, 1.10 grams of H₂ is required.

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        Ag,  first image

        F₂, second image

          CO, Third  image

         PbI₄

Atomic elements are chemical species that can exist as independent atoms, for ex-Ag, Au.

elements that exist in a free state in the molecular form are, molecular elements, for ex -Cl₂, I₂.

Molecular compounds are substances that consist of bonding between atoms of different elements. for ex-H₂O .

Ionic compounds are compounds that are formed by the reaction of metal with non-metal. for ex - NaCl.

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The reactivity of carboxylic acid derivatives depends on the electrophilic character of the carbonyl carbon atom and the ability of the z atom to stabilize the carbonyl group by resonance.

Carbon compounds are compounds whose main components are composed of carbon atoms (C), hydrogen (H), oxygen (O), nitrogen (N), sulfur (S), and other organic elements. Carbon compounds also have the ability to form carbon chains and bind various functional groups. One of the carbon compounds based on their functional group is a carboxylic acid.

Carboxylic acids are carbon compounds with the general formula R－COOH which are called carboxyl groups by combining a carbonyl group and a hydroxyl group. This compound can be prepared by strong oxidation of primary alcohols. Carboxylic acid derivatives have different stability and reactivity. The reactivity of carboxylic acid derivatives depends on the electrophilic character of the carbonyl carbon atom and the ability of the z atom to stabilize the carbonyl group by resonance.

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1.81 is the pH of of CH3COOH with a concentration of 0.16 M

CH3COOH is the chemical formula of the acetic acid . acetic acid is also known as ethanoic acid systematically.

Given:

Ka of acetic acid=1.8*[tex]10^{-5}[/tex]

CH3COOH with a concentration of 0.16 M

To find :

the pH of CH3COOH with a concentration of 0.16 M

For that we use the Ostwald's dilution law equation i.e.

[H +]= [tex]\sqrt{C*K​}[/tex]

now after putting the values we get:

[H +]= [tex]\sqrt{0.16*1.8*10-5}[/tex] =7.2*10-6

now pH = −log[H+]

pH = −log[7.2*10-6]

pH = 1.81

hence, 1.81 is the pH of of CH3COOH with a concentration of 0.16 M

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The pH of CH3COOH at a concentration of 0.16 M is 1.81.

Describe CH3COOH.

The acetic acid chemical formula is CH3COOH. Systematically, acetic acid is also referred to as ethanoic acid.

Given:

Acetic acid's KA is 1.8*.

a 0.16 M concentration of CH3COOH

Solution: Locate

the pH of CH3COOH at 0.16 M concentration

For that, we employ the equation for Ostwald's dilution law, i.e.

[H +]= [tex]\sqrt{C Ka}[/tex]

now that we've entered the values, we get:

[H +]= =7.2*10-6

pH now equals log[H+]

pH = −log[7.2*10-6]

pH = 1.81

Consequently, CH3COOH has a pH of 1.81 at 0.16 M of concentration.

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Based on the solubility curve and information above, the solution at 70°C is an unsaturated solution.

A solubility curve is a curve that is obtained when the mass of solute that dissolves in a given volume of solvent is plotted against the temperature of the solution.

Solubility curves are useful in determining the amount of solute that can be dissolved in a given volume of solvent.

A saturated solution can not dissolve more solute at that temperature.

An unsaturated age can dissolve more solute at the given temperature.

Considering the given data:

The student dissolved 60g of KNO3 in 100 mL of water at 70°C.

The given solubility curve shows that about 130 g of solute can dissolve in 100 g of water.

Hence, the solution is an unsaturated solution.

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The element with electronic configuration 3s2 3p1  is aluminum and 2s2 2p5 is Florine.

Electronic configuration is defined as the distribution of electrons within an atom's orbitals. The atomic number, which is equal to the number of protons in every neutral atom, is the set quantity of electrons that make up each neutral atom.

Al has 13 electrons, which are organized as follows: 1s2 2s2 2p6 3s2 3p1. Al has an atomic number of 13. The structure 1s2 2s2 2p5 of fluorine, on the other hand, demonstrates that it has seven valence electrons. It belongs to the halogen family as a result.

Thus, the element with electronic configuration 3s2 3p1  is aluminum and 2s2 2p5 is Florine.

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a) The number of H⁺ ions is 10⁻⁹ and it is basic.

b) The number of H⁺ ions is 10⁻⁷ and it is neutral.

c) The number of OH⁻ ions is 10⁻¹³ and it is acidic.

Water's pH position indicates how acidic or introductory it is. The range is 0 to 14, with 7 acting as a neutral value. A pH of lesser than 7 denotes a base, while one of lower than 7 suggests acidity.

The pH scale really measures the proportion of free hydrogen and hydroxyl ions in water. Water that contains further free hydrogen ions is acidic, whereas further free hydroxyl ions makes water more introductory. Since chemicals in the water can alter pH, pH is a pivotal sign of a chemical change in the water. In" logarithmic units," pH is expressed. Each value signifies a10-fold variation in the water's acidity or basicness. Ten times as acidic as water because water has a pH of five.

a) [H⁺] = 1 x 10⁻¹⁴/1 x 10⁻⁵ = 10⁻⁹.

Since the [H⁺] < [OH⁻] the solution is basic.

b) [H⁺] = 1 x 10⁻¹⁴/1 x 10⁻⁷ = 10⁻⁷

since the [H⁺] = [H⁺]

The solution is neutral

c) [OH⁻] = 1 x 10⁻¹⁴/1 x 10⁺ = 10⁻¹³

since the [H⁺] > [OH⁻]

the solution is acidic

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The amount of the excess reactant that will remain if 16.0 g of solid iron reacts with 28.0 g of chlorine gas would be 1.68 grams.

Solid iron reacts with chlorine gas to produce iron chloride according to the following balanced equation:

[tex]2Fe + 3Cl_2 --- > 2FeCl_3[/tex]

From the balanced equation, the mole ratio of iron to chlorine gas is 2:3. This means that every 1 mole of iron requires 1.5 moles of chlorine gas for a complete reaction.

recall that: mole = mass/molar mass

16.0 g of solid iron is equivalent to:

16/56 = 0.29 mol

28.0 g of chlorine gas would be equivalent to:

28/71 = 0.39 mol

With 0.29 mol of solid iron, the equivalent amount of chlorine gas that would be required according to the balanced equation would be:

0.29 x 3/2 = 0.41 mol

But only 0.39 mol of chlorine gas is available. So, chlorine is the limiting reactant.

The actual amount of solid iron that will react with 0.38 mol of chlorine would be:

2/3 x 0.39 = 0.26 mol

Excess solid iron = 0.29 - 0.26

                            = 0.03 mol

Mass of 0.03 mol iron = 0.03 x 56 = 1.68 grams

Thus, the amount of excess iron that will remain once the reaction is complete would be 1.68 grams.

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The stereoisomers are obtained only in the first and second part of the reactions whereas, the last two parts do not produce stereoisomers.

Pentene reacts with hydrogen halides to produce chlorophenothane. This reaction is known as an addition reaction, as the hydrogen halide molecules add to the double bond of the alkene to form a single bond. The products of this reaction are typically alkyl halides, where the hydrogen atom of the hydrogen halide is replaced by an alkyl group. Stereoisomer is formed in this reaction due to the chiral center.

In the second part When pentene reacts with water in the presence of H₂SO₄, an acid-catalyzed hydration reaction occurs. This reaction results in the formation of an alcohol product, which is formed by the addition of a hydroxyl group (-OH) to the carbon-carbon double bond in the alkene. Due to the presence of chiral center stereoisomer is observed.

In part C, the Treatment of 1-methylcyclopent-1-ene with methanol in the presence of acid yields 1-methoxy-1-methyl cyclopentane. Here, the product does not exhibit a chiral center, so no stereoisomers are formed.

In the last part, the Treatment of 2-methylbut-2-ene with HBr gives 2-bromo-2-methylbutane. Here, too the product does not contain a chiral center, so no stereoisomers are formed or observed.

The image attached explains the reaction in each part.

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The chemical that experiences E2 elimination just at quickest rate is represented by the best answer, h55172a.

For an E2 reaction to proceed, several conditions must be met: In the introduction of a base, secondary or tertiary alkyl halides may continue with E2 (OH-, RO-, R2N-) In order for that a double bonds to form during the reaction, both leaving groups must be on the same axis.

Here are a few E2 responses as examples. Alkenes are created by the removal of alkyl halides. Alkenes are created by the removal of alcohols. Take note that acid, not base, is used in the E2 clearance of an alcohol.

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There are numerous subcultures, such as hippies, anti-gun groups, high school jocks, environmental activists, people in the furry community, people in the cosplay community, punks, goths, and many more.

"An identifiable subgroup within a society or group of people, particularly one distinguished by beliefs or interests that differ from those of the larger group."

Subcultures are important in articulating an identity, creating a sense of belonging, and influencing members to think about their relationship to mainstream society; however, subcultures differ from widely recognized identity categories such as ethnicity.

Subcultures exist within a society's dominant culture. Subcultures in America include hippies, punk rockers, beatniks, and hipsters.

Thus, There are numerous subcultures, such as hippies, anti-gun groups, high school jocks, environmental activists, people in the furry community.

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There are natural forces such as the one between two surfaces that rub, called friction. Another force is gravity, that pulls us to the center of the Earth.

Many forces can be found acting on the same object. When two forces act in the same direction, we sum the forces to find net force the force. This causes friction the forces are in the movement of the object. speed up, slow down, change direction or

19. An inclined plane is often called a ramp - It is a flat surface.

Force is defined as the product of mass and acceleration. It is a derived quantity and measured in Newtons ( N ). This goes to say that the S.I unit of force is Newton. However, foce is also measured in kilograms per meters squared.

There are two major types of force, there are:

In conclusion, we can now confirm from the explanation given above that force is obtained from the combination of fundamental quantities.

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A house is built with a granite countertop. The temperature of the countertop change is 0.032 °C.

Transfer of heat or the transfer of heat energy from one body to another body.

Q = CΔT where Q = quantity of heat transferred to the countertop = 5000 J = 5 kJ, C = heat capacity of the countertop = 158.5 kJ/°C and ΔT = temperature change of the countertop.

Since we require the temperature change of the countertop, we make ΔT subject of the formula.

So, ΔT = Q/C

So, by substituting the variables into the equation:

ΔT = Q/C

ΔT = 5 kJ/158.5 kJ/°C

ΔT = 0.032 °C

Therefore, the temperature of the countertop change is 0.032 °C.

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a) The order of the reaction with respect to the complex is 1 and order with respect to Y is 2.

b) The rate constant for reaction is 2.2 × 10⁹ mol⁻²dm⁶s⁻¹.

What is order of reaction and rate constant?

The order of reaction is defined as sum of the power raised to the concentration terms . The rate constant defined as the relation between concentration and rate of the reaction, and it is also temperature dependent.

Using Rate = K [complex]ᵃ [Y]ᵇ

a)  125 = K (8.01) ᵃ (2.7) ᵇ

144= K (9.22) ᵃ (2.7) ᵇ

Divide these two equations

125/144 = (8.01/ 9.22) ᵃ

(0.868) = (0.868) ᵃ

⇒ a= 1 order with respect to complex is 1

b)  R₂=K(complex)ᵃ(Y)ᵇ

125=K (8.01) (2.7) ᵇ

640=K (8.01) 6.1) ᵇ

Divide these two equations

we get, 0.195 = (0.443)ᵇ

⇒ b= 2 order with respect to Y is 2.

Now Rate constant

125=K (8.01) ¹ (2.7) ²

K = 2.2 ₓ 10⁹mol⁻²dm⁶s⁻¹.

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Answer:

It's 39.43g

Explanation:

molarity is the ratio of the number of moles over the volume in a litter while the number of moles is the ratio of the mass of solute over the molar mass of compounds

The correct statements regarding the formation of electrophiles are:

B) This mechanism predicts the rate law, rate-k[Cl[FeCl3 which is not in agreement with that observed rate.

D) This mechanism requires that all aromatics, both electron-rich and electron-poor react at the same rate.

An electrophile is a chemical entity that joins with nucleophiles by taking up a pair of electrons in chemistry. Electrophiles are Lewis acids because they receive electrons. The majority of electrophiles have an atom that has a partial positive charge, is positively charged, or lacks an octet of electrons.

1st statement is wrong. Because a mechanism with 4 steps is possible.

2nd statement is correct. Because in the rate determining step only Cl2 and FeCl3 are involved.

3rd statement is wrong. Because if Cl+ is unstable. Then its formation must be rate-determining step. It will not be a fast step.

4th statement is correct. Because the attack of benzene on Cl+ is a fast step. Therefore electron-rich and electron-poor aromatic will react at the same rate.

The correct statements regarding the formation of electrophiles are:

B) This mechanism predicts the rate law, rate-k[Cl[FeCl3 which is not in agreement with that observed rate.

D) This mechanism requires that all aromatics, both electron-rich and electron-poor react at the same rate.

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The replacement product won't have a R or S configuration because there isn't a chiral carbon atom of that kind.

As a general rule, chiral carbon centers are carbon atoms positioned at the four corners of a tetrahedron and attached to four distinct substituents. Steeogenic carbons and asymmetrical carbon atoms are other names for chiral carbon atoms.

In the substitution reaction, an electron-rich species (the oxygen) donates two electrons to an electron-poor species (the carbon), creating a new base and product (the alcohol) in the process.

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