QUESTION 24
Calculate [H 30+] of a solution with a pH of 2.14.

Based on the given information, the options that are true for the saponification of compounds 1-4 are:

A. True, as the rate-determining step is slowed by bulkier groups adjacent to the reaction centre.

B. False, as methyl groups are electron-donating, they increase the rate of step 2, not step 1.

C. True, as mentioned in option A.

D. False, as step 3 is the final step and determines the rate of saponification.

As we know, the saponification mechanism involves the reaction of an ester with a strong base, typically hydroxide ion, to produce a carboxylate salt and an alcohol. The rate-determining step in this mechanism is the formation of a tetrahedral intermediate from the ester, which requires the nucleophilic attack of the hydroxide ion on the carbonyl carbon of the ester.

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Answer:

we cant draw jn this

Explanation:

because it contin citric acid

Clofibrate is a lipid-lowering pharmaceutical that has been utilized to treat hyperlipidemia. Its metabolism system includes different pathways such as hydrolysis, oxidation, conjugation, and others.

Metabolites are little molecules that are produced during the process of  metabolism in living living beings.

Clofibrate hydrolysis metabolite:

Clofibrate oxidation metabolites:

Clofibrate alkylation metabolites:

Clofibrate conjugation metabolites:

Conclusively, the relative abundance and significance of each metabolite can vary among individuals.

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The balanced chemical equation for the combustion of propane with oxygen is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

To balance the equation, first balance the carbon atoms on both sides of the equation. There are three carbon atoms in the propane molecule and three in the carbon dioxide molecule, so balance the carbon atoms by putting a coefficient of 3 in front of the CO₂ molecule.

C3H8 + 5O2 → 3CO₂

Next, balance the hydrogen atoms. There are eight hydrogen atoms in the propane molecule and four in the water molecule, so balance the hydrogen atoms by putting a coefficient of 4 in front of the H₂O molecule.

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Finally, balance the oxygen atoms. There are five oxygen atoms on the left side and 10 on the right side, so balance the oxygen atoms by putting a coefficient of 5 in front of the O₂ molecule.

Therefore, the correct whole number coefficient for propane, C3H8, is 1.

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To solve this problem using the gas laws, we need to use the Ideal Gas Law. This law states that the product of the pressure and the volume of a gas is proportional to the absolute temperature.

The equation of the Ideal Gas Law is the following:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{\dfrac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} } \end{gathered}$} }\)

Where:

We clear for V₂:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{P_1V_1T_2}{P_2T_1 } } \end{gathered}$} }\)

Where:

Substituting the known values:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760\not{kPa}\times0.050 \ L\times20.0\not{k} }{ 380\not{kPa}\times10.0\not{k} } } \end{gathered}$} }\)

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760 \ L}{3800 } } \end{gathered}$} }\)

\(\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2\approx0.2 \ Liters} \end{gathered}$} }}\)

Answer:

A - Cinder cone

B - Shield

C - Composite

Explanation:

Cinder cone volcanoes are formed when the volcano explodes and all the lava soldifies and falls steeply upon the sides of the mountain and forms cinders.

Shield volcanoes form when a centralized vent produces low-viscosity flows over a long period of time

Composite volcanoes are also called stratovolcanoes. They form when different types of eruptions deposit different materials around the sides of a volcano. Alternating eruptions of volcanic ash and lava cause layers to form. Over time these layers build up.

Answer:

Answer:A - Cinder coneB - Shield C - CompositeExplanation:Cinder cone volcanoes are formed when the volcano explodes and all the lava soldifies and falls steeply upon the sides of the mountain and forms cinders. Shield volcanoes form when a centralized vent produces low-viscosity flows over a long period of time Composite volcanoes are also called stratovolcanoes. They form when different types of eruptions deposit different materials around the sides of a volcano. Alternating eruptions of volcanic ash and lava cause layers to form. Over time these layers build up.:

Answer:

Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension

Explanation:

yes yes yes yes

yes

yes

yes

yes

yes

Answer:

Option 4

Explanation:

In water molecule, oxygen has -2 charge on it while the hydrogen has +1 charge and one atom of oxygen combines with two hydrogen atoms. A hydrogen need only two electrons to complete its octet (one electron is its own the second electron is shared by oxygen) and a oxygen needs 8 electrons (It has six of its own and two are shared by two hydrogen atom).

Hence, option 4 is correct

Answer:

Option 2

It's more balanced than the others

Answer:

18.998403

is the mass

The bonds present in BH₂⁻ ion are single covalent bonds.

BH₂⁻ has the chemical formula for dihydridoborate(-1) which is also called Boranide. BH₂⁻ consists of one boron atom and two hydrogen atoms.  BH₂⁻ can be defined as a boron hydride.

In  BH₂⁻ lewis structure, there are two atoms present i.e. boron atom and a hydrogen atom. The boron atom has 3 valence electrons and the hydrogen atom has one valence electron in their outer shell orbitals.

All the B and H atoms in the structure are arranged not in a symmetrical manner and lone electron pairs there is repulsion between atoms and creating a 120° bond angle and having a bent shape.

BH₂⁻ ion contains B and H atoms, which are connected with each other by single covalent bonds.

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Question

If 166.05 J of heat energy was added to a lead sinker with a mass of 143 grams, then what is the total temperature change for the lead sinker? Assume the specific heat of lead is 0.129 J/g°C.

Procedure

The question asks for a temperature change and provides the specific heat, mass, and added energy to a lead sinker. Therefore it is useful to use the specific heat equation to determine the temperature change.

Where Q is the heat energy, m is the mass, c is the specific heat, and ΔT is the temperature change.

Rearranging the variables in the equation

Solving the equation

ΔT= 9.0 °C

Answer

ΔT= 9.0 °C (Answer D)

Answer:Thermal energy transfer involves the transfer of internal energy.

Explanation:

Three types of thermal energy transfer are conduction, convection and radiation.

0.4141 grams of hydrogen gas will be produced from the reaction.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and zinc (Zn) can be written as follows:

2 HCl + Zn → ZnCl2 + H2

To determine the grams of hydrogen gas produced by each reactant, we need to use the concept of stoichiometry. First, we calculate the number of moles of each reactant.

The molar mass of HCl is approximately 36.5 g/mol, and the molar mass of Zn is approximately 65.4 g/mol.

For hydrochloric acid (HCl):

Number of moles = Mass / Molar mass = 7.5 g / 36.5 g/mol = 0.205 moles

For zinc (Zn):

Number of moles = Mass / Molar mass = 6.5 g / 65.4 g/mol = 0.0993 moles

According to the balanced equation, the mole ratio between HCl and H2 is 2:1. Therefore, for 0.205 moles of HCl, the theoretical yield of H2 is 0.205 moles.

The molar mass of hydrogen gas (H2) is approximately 2.02 g/mol.

To determine the mass of hydrogen gas produced:

Mass of H2 = Number of moles of H2 × Molar mass of H2

          = 0.205 moles × 2.02 g/mol

          = 0.4141 g

Therefore, 0.4141 grams of hydrogen gas will be produced from the reaction.

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Answer:

The student measured the cup and got an incorrect answer

Explanation:

because he was in a rush.

Answer:

2-chlorohexane

Explanation:

In this figure :

⇒ The Cl is a substituent group, termed as -chloro

⇒ Based on IUPAC nomenclature, the 6 atom chain starts with hex

⇒ There are only single bonds present, so it is an alkane

The name is :

When NaCl is added to water, it undergoes dissociation, that is, the ions Na+ and Cl- dissociate.

The equation of this reaction is:

NaCl + H2O --> Na+ + Cl- + OH- + H+

• that the mass fraction of Na2CO3 = 2%

meaning 2 grams of Na2Co3 was dissolved in 98g of water .

∴ total mass of solution = 100g

• Density = 1.019g/mL.

• Molar mass Na2CO3=105,9888 g/mol

Density = mass /volume

∴Volume = mass/density = 100g /1.019g/mL.

= 90.66mL.

n = mass Na2CO3/MolMass Na2Co3

= 2 g /105.9888g/mol

∴moles of Na2CO3 =0.019moles Na2CO3

Molarity =( n/v) * 1000

= (0.019mol/(90.66/1000) L

= (0.019/90.66)*1000 ( multiply by 1000: 90.66/1000=0.09066)

=0.21M

Answer:

Explanation:

It's simple train track method of cancelling out units.

If we read the balanced equation as this: 2 dm3 of octane reacts to form 16 dm3 of CO2 then how much CO2 is produced by 1 dm3?

Would you agree that it would be half of 16?

\(\frac{2dm3}{16 CO2} = \frac{1dm3}{?CO2}\)

Cross multiply and solve for ?, you get 8.

Answer:

how the heck did you think of a question like this

Explanation:

Answer: In addition to building texture, starches are used to contribute stability to food products. This often takes the form of holding water. As previously mentioned, gelatinized starch molecules tend to reassociate with one another.

Answer: Theoretical yield of \(SO_3\) produced by 8.96 g of S is 33.6 g

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)

\(\text{Moles of} S=\frac{8.96g}{32g/mol}=0.28moles\)

The balanced chemical equation is:  

\(2S+3O_2\rightarrow 2SO_3\)  

According to stoichiometry :

2 moles of \(S\) produce =  3 moles of \(SO_3\)

Thus 0.28 moles of \(S\) will produce=\(\frac{3}{2}\times 0.28=0.42moles\)  of \(SO_3\)  

Mass of \(SO_3=moles\times {\text {Molar mass}}=0.42moles\times 80g/mol=33.6g\)

Thus theoretical yield of \(SO_3\) produced by 8.96 g of S is 33.6 g

Answer:

A molecular mass is mass on the substance  and mole is a unit of substance such as atoms and electrons.

Explanation:

Molecular mass: A molecule's molecular mass is equal to the sum of all of the atoms' individual atomic masses. It establishes the molecular mass of a single unit.

Example:

Molecular mass of O2 = 32 atomic mass units

Mole: A mole is \(6.02214076 x 10^2^3\)of any chemical unit, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any material, the mole is a useful measure to utilize. The initial definition of the mole was the number of atoms in 12 grams of carbon-12.

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900 mph................

Answer:

a = 0.8 m/s/s

Vav = 45m/s

Explanation:

Vav = \(\frac{Vi + Vf}{2\\}\)

Vav = \(\frac{10 +80}{2}\)

Vav = 45m/s

a = \(\frac{v}{t}\)

a = \(\frac{4m/s}{5s}\)

a= 0.8m/s/s

The mass of 1 mole of phosphorus atoms is calculated to be 30 grams.

Mass number of an atom is defined as the sum of total number of protons and neutrons present in an atom. The mass number of any element is calculated by the formula:

Mass Number (A) = Number of Protons + Number of Neutrons

On the other hand, atomic number is defined as the total number of protons present in an atom.

Therefore, it is calculated experimentally that mass number of phosphorous is 30 g/mol whereas atomic number of phosphorous is 15.

Therefore, the mass of 1 mole of phosphorus atoms is 30 grams.

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Answer:

The correct answer is 27.764 grams.

Explanation:

A standard scientific unit for determining the large quantities of very small entities like molecules, atoms, or other specific particles is termed as a mole. The molecular weight of lithium is 6.941 grams per mole. Thus, one mole of lithium has 6.941 grams.

If, 1 mole of Li has 6.941 grams, then 4 moles of Lithium will have,

= Molecular mass of lithium/1 mole * 4 mole

= 6.941 gram per mole/1 mole * 4 moles.

= 27.764 grams

Answer:

Option C

Explanation:

According to Hund's rule

d subshell has 5 orbitals.