Calculate the molality of the following:
(b) A solution containing 16.5 g of naphthalene (C₁₀H₈) in 53.3 g of benzene (C₆H₆)

Therefore, the alkene with the most alkyl groups attached to the double bond will react most rapidly with HCl to give an alkyl chloride.

To predict which alkene will react most rapidly with HCl to give an alkyl chloride, we need to consider the reaction mechanism for electrophilic addition. In this mechanism, the first step determines the rate of the overall reaction.

The first step involves the formation of a carbocation intermediate.

The stability of the carbocation is crucial in determining the rate of the reaction. The more stable the carbocation, the faster the reaction will proceed.

Alkenes with more alkyl groups attached to the double bond will stabilize the carbocation through hyperconjugation, making them more reactive.

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The volume of O2 produced is 7.05 L at 150°C and 2.0 atm when 28.5 g of hydrogen peroxide decomposes to form water and oxygen.

The stoichiometry of the reaction and the ideal gas law. From the balanced equation, we know that 2 moles of hydrogen peroxide decomposes to produce 1 mole of oxygen gas. So, we first need to convert the given mass of hydrogen peroxide to moles using its molar mass, which is 34.0147 g/mol.
28.5 g H2O2 ÷ 34.0147 g/mol = 0.838 mol H_{2}O_{2}
Since 2 moles of H2O2 produces 1 mole of O2, we can then find the number of moles of O2 produced:
0.838 mol H2O2 ÷ 2 mol O2 = 0.419 mol O2
Now, we can use the ideal gas law to find the volume of O2 produced. Rearranging the equation PV=nRT, we get V=nRT/P.
V = (0.419 mol)(0.08206 L•atm/K•mol)(423 K) ÷ 2.0 atm = 7.05 L O2
Therefore, the volume of O2 produced is 7.05 L at 150°C and 2.0 atm when 28.5 g of hydrogen peroxide decomposes to form water and oxygen. It's important to note that this assumes the reaction goes to completion and all of the oxygen gas produced occupies the given conditions of temperature and pressure.

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complete question: What volume of O_{2} is produced when 28.5 g of hydrogen peroxide (H_{2}O_{2}) decomposes to form water and oxygen at 150°C and 2.0 atm? 2H_{2}O_{2} (aq) --> 2H_{2}0 (1) + O_{2} (g)

Answer: 3. No displacement, zinc is most reactive.

4. Calcium Chloride, Calcium is most reactive.

5. No displacement, Copper is most reactive

6. No displacement, Calcium is most reactive

7. Hydrogen Oxide, Hydrogen is most reactive

8. Carbon oxide, Carbon is most reactive

9. No displacement, Aluminum is most reactive

10. Potassium Kryptide + Lead, no displacement, Potassium is most reactive.

Both compound has same one mole of phosphorus.

Phosphorus is a mineral that occurs naturally in many foods and can also be obtained as a supplement. It serves several functions in the body. It is an important component of bones, teeth, and cell membranes. It aids in the activation of enzymes and maintains blood pH within a normal range.

Phosphorus is required for the growth, maintenance, and repair of all tissues and cells, as well as the production of DNA and RNA, the genetic building blocks. Phosphorus is also required for the proper balance and utilization of other vitamins and minerals, such as vitamin D, iodine, magnesium, and zinc.

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The human activity creating water pollution and depletion are uses of fertilizers, detergents and chloro flouro carbon many other things.

Water pollution is defined as the contamination of water bodies, usually as a result of human activity, in such a way that their lawful uses are harmed.

The activities of human that creating water pollution are:

And depletion in the ozone layer are due to halogen source gases, which contain chlorine and bromine atoms, are produced by human activities. These emissions into the atmosphere eventually contribute to ozone depletion in the stratosphere.

Hence human activities are uses of fertilizers, detergents and many other things.

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An enzyme lowers the energy needed for the reaction to occur. Option 7 is correct.

Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are typically proteins that have a specific shape that allows them to bind to a substrate (the molecule being transformed by the reaction) at a specific site called the active site. Enzymes work by lowering the activation energy of a reaction, which is the energy needed to start the reaction.

By lowering the activation energy, enzymes make it easier for the reactants to form products, thus increasing the rate of the reaction. Enzymes achieve this by bringing the reactants (substrates) closer together in the active site, allowing them to interact more easily and increasing the likelihood that they will form products.

Enzymes can also alter the shape of the substrate, making it more reactive or more stable in the transition state of the reaction. Overall, enzymes help to speed up chemical reactions in the cell by lowering the activation energy and making it easier for the reactants to form products. Option 7 is correct.

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Number 7.

It lowers the energy needed for the reaction to occur.

k12 unit test

To prepare a 130 mL of a 1.6% agarose gel for gel electrophoresis, you would need 2.08 grams of agarose. Option b is correct

A molecular biology technique called electrophoresis is used to separate biomolecules based on their mass and electrical charges.

A molecular biology technique called electrophoresis allows biomolecules like DNA or proteins to be separated based on their electrical charges and weight. For instance, DNA migrates to the positive pole when subjected to an electrophoretic field due to its negative charge, and distinct DNA molecules may also be distinguished by the weight of their base pairs.

To sum up, the technique of electrophoresis is employed in molecular biology labs to separate biomolecules based on their mass and electrical charges.

tiny size DNA is moved by gel electrophoresis across a matrix of molecules that blocks larger molecules from migrating but allows smaller ones to do so. This enables the size separation of molecules.

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The complete question is

How much agarose, in grams, would you need to prepare a 130 mL of a 1.6% agarose gel for gel electrophoresis?

a. 1.3 g b.  2.08 g c. 1.6 g d. 20.8

Benzoic acid is soluble in base. It is soluble in benzene, carbon tetrachloride, acetone, and alcohols and it's reactions occur at the carboxyl group or even at the aromatic ring.

Benzoic acid is a monobasic aromatic acid, moderately strong, white and crystalline powder.

Benzoic acid becomes soluble in alkaline medium, . The abundant OH- ions will react with benzoic acid in acid-base reaction to give water and benzoate ion, which is now soluble in water due to strong ion-dipole forces of attraction.

Benzoic acid becomes insoluble in acidic medium. Increase in concentration of H+ ions shifts the position of equilibrium of dissociation of benzoic acid to left causing benzoic acid to be hardly soluble in acidic medium.

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

The metal molecules inside start to vibrate faster, causing the solid to change to liquid if exposed to the intense temperature over a long period of time.

Explanation:

As my answer states, but for an explanation, lets say you are boiling an ice cube, it will start to turn into liquid water, that is because it has been exposed to that heat for a long period of time. The same will happen for the metal, if its exposed for long enough, it will turn into a liquid, then can be turned into a gas because the molecules are vibrating so quickly that they start to easily move apart.

Hope this helps, let me know if any more clarification is needed.

To prepare a buffer solution of pH = 10.54, the relative masses of dimethyl amine and dimethyl ammonium chloride needed are 0.079 g and 0.067 g respectively.

A buffer solution is a solution that has the ability to resist changes in pH upon the addition of small amounts of acid or base. A buffer solution contains a weak acid and its conjugate base or a weak base and its conjugate acid. It can be prepared by mixing equal volumes of a weak acid and its conjugate base or a weak base and its conjugate acid.

Dimethyl amine is an organic compound with the formula (CH3)2NH. It is a weak base and can act as a proton acceptor. Dimethyl ammonium chloride is an organic compound with the formula (CH3)2NH2Cl. It is a salt of a weak base and a strong acid and can act as a proton donor.

Calculation of relative masses:

The pKa of dimethyl amine is 10.73.

To prepare a buffer solution of pH = 10.54,

the ratio of [A-]/[HA] should be 1/9.

Using the Henderson-Hasselbalch equation;

pH = pKa + log([A-]/[HA])10.54 = 10.73 + log([A-]/[HA])

log([A-]/[HA]) = -0.19[A-]/[HA] = 0.67/1.00

The sum of the masses of dimethyl amine and dimethyl ammonium chloride is 0.146 g. The ratio of their masses is 0.67:1.00.

So, the relative masses of dimethyl amine and dimethyl ammonium chloride needed are 0.079 g and 0.067 g respectively.

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Answer:

violet

Explanation:

Answer:

Sorry for the wrong answer plz

99% was the percent yield of the reaction. So, the correct option is A.

Percent yield is defined as the percentage ratio of the actual yield to the theoretical yield. It is a measure of the amount of moles of product formed in relation to the reactant obtained in a chemical reaction, expressed as a percentage.

For percent yield, we have to first find the number of moles.

1 Mg(S) + 2 HCl(Aq) → 1 MgCl2(Aq) + 1 H2(G)

Mole of Mg (s)= Mass of Mg/ Molar mass

=48/24= 2 moles

Moles of HCl= 73/36.5= 2moles

So, 1 mole of Mg reacts with 2 moles of HCl as per the equation which means HCl is the limiting reagent. Mg will act as excess reagent so only 1 mole of Mg will react while the unreacted Mg will be 24g i.e. 1 mole.

The product which is experimental= 120-24= 96g

Theoretical product formed= 1mole of \(MgCl_2\)+ 1 mole of HCl= 95+2= 97gm/mole

Percentage Yield = (experimental Yield / Theoretical Yield) × 100 %

= (96/97)*100 = 98.96% which is approx. 99%

Thus, 99% was the percent yield of the reaction. So, the correct option is A.

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Your question is incomplete, most probably the complete question is:

The Following Reaction Is Carried Out:

1 Mg(S) + 2 HCl(Aq) → 1 MgCl2(Aq) + 1 H2(G)

The Initial Masses Of The Uncombined Reactants appear below:

Mass of magnesium- 48g

mass of hydrochloric acid= 73g

The reactants are combined and the final mass of the system is determined. If the final mass of the system is 120g, what was the percent yield of the reaction?

Percentage composition by mass of oxygen in MgSO₄ is 5.33% if the formula mass of magnesium sulfate is 120g/mol.

Formula mass and sub-atomic mass are two qualities that express the size of a particle.

The formula mass (recipe weight) of a particle is the amount of the nuclear loads of the molecules in its exact recipe.

The sub-atomic mass (sub-atomic weight) of a particle is its typical mass as determined by including the nuclear loads of the iotas in the atomic recipe.

Formula mass of MgSO₄=120g/mol

Now, we know that atomic mass of oxygen is 16g. Here, we have 4 atoms of oxygen. So, total atomic mass of oxygen =16 × 4 g/mol.=64g/mol.

Now, percentage composition of oxygen = (64/120) × 100

=>percentage composition of oxygen = 6400/120

=>percentage composition of oxygen=640/120=5.33%

Hence, percentage composition by mass of oxygen is 5.33%

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Answer:

MgO

Explanation:

The correct option is (d) Carbon Dioxide.

Explanation:

The density of air is around 1.2 g/L, which means that any gas with a density above this value is more dense than air.

Carbon dioxide has a density of approximately 1.98 g/L, which is considerably more dense than air (composed of nitrogen and oxygen).

As a result, if a gas sample is determined to be more dense than air, it is likely to be carbon dioxide (CO2), which has a molecular weight of 44 g/mol.

Carbon dioxide is produced in the laboratory by many chemical reactions and is commonly employed in the food and beverage industries, such as carbonating soda and beer.

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The sample of solid water would undergo several phase changes as it is heated, transitioning from a solid to a liquid, then to a gas, and possibly to a supercritical fluid.

A sample of solid water, also known as ice, would undergo several changes when heated from -10 degrees Celsius to its critical temperature at a pressure of 1.00 atm. These changes include:

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Answer:

C) Elements that decay have a proton to neutron ratio that is too high or too low.

Explanation:

e2021

The correct formula for a compound formed from the elements Al and O is Al₂O₃.

Correct option is C.

Aluminum oxide is an oxide of aluminum with the chemical formula Al₂O₃ which is primarily composed of two chemically bonded aluminum and oxygen atoms. Aluminum oxide chemical compounds exist in various forms, with the most common being alpha, gamma, and theta.

The solid compound is an odorless, white powder which is insoluble in water and is a major component of the Earth's crust. It occurs naturally as corundum, bauxite, and cryolite and can be synthetically produced through burning aluminum metal or dissolving alumina tri-hydrate.

Aluminum oxide is widely used in a variety of applications due to its unique properties such as hardness, thermal conductivity, electrical conductivity, optical properties, and chemical inertness.

Correct option is C.

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Answer:

homogenous mixture

Explanation:

no choices are given so that is my best guess

Answer:

diffusion

Explanation:

Diffusion can be defined as the net movement of particles from a high concentration to a low concentration. This sounds like the most plausible word in this case.

Answer:

Probably because there is more helium to burn. After billions of years there's only gonna be helium so no more of that firey energy.

I think....

Answer:

True

Explanation:

Answer:

Explanation:

Remark

It's true.

That's how the  periodic table is designed. Hydrogen is #1 and #116 is the latest entry. It is known as  flerovium and livermorium. I'm not sure if that and shouldn't be an or, but that is your answer.

The mass percent of the sodium fluoride solution is approximately 29.8%.

Given:

Moles of sodium fluoride (NaF) = 0.64 mol

Mass of water (\(H_2O\)) = 63.5 g

To find the mass of sodium fluoride, we can use its molar mass, which is 41.99 g/mol (sodium = 22.99 g/mol, fluorine = 18.99 g/mol):

Mass of NaF = Moles of NaF * Molar mass of NaF

\(= 0.64 mol * 41.99 g/mol \\= 26.91 g\)

The total mass of the solution is the sum of the mass of sodium fluoride and the mass of water:

The total mass of solution = Mass of NaF + Mass of \(H_2O\)

\(= 26.91 g + 63.5 g \\= 90.41 g\)

Now we can calculate the mass percent:

Mass percent = (Mass of NaF / Total mass of solution) * 100

\(= (26.91 g / 90.41 g) * 100 \\= 29.8%\)

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