15.47 consider the 1 h nmr spectrum of the following compound, and rank the signals in terms of increasing chemical shift. identify the proton(s) giving rise to each signal: h o o oh o

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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The type of energy transfer between the frozen ice cream and the tongue is convection. The frozen ice cream will gradually melt because of the temperature difference.

Convection is the method of heat transfer that involves the transmission of heat in a fluid (liquid or gas) by the circulation of currents.

According to this question, a spoonful of frozen ice cream is placed on the tongue. The heat transfer will occur between the tongue with warmer temperature and the ice cream with colder temperature.

The heat energy will flow from the tongue to the ice cream, hence, making it defreeze or melt with time. This type of heat transfer is convection because it involves a fluid.

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Answer:

The answer is A

Explanation:

I took the quiz

The first step is to determine if there is a limit reactant in the equation.

To do this, we have to use the ratios of the coefficients of the reactants to see how many moles of each of them must react with the given quantity of the other reactant.

For example, multiply 7.4 moles of aluminium by the ratio of copper (II) sulfate to aluminium:

We need 11.1 moles of copper (II) sulfate to react with 7.4 moles of aluminium, but since we only have 5.4 moles of it, copper (II) sulfate is the limit reactant, so we have to base our calculations on this amount.

Use the amount of copper (II) sulfate and the ratio of the coefficients of copper and copper (II) sulfate:

The answer is 5.4 moles of copper.

From the calculation, the wavelength of the electron is obtained as  396 nm.

The Balmer series is the series that do end up in the second level of the hydrogen atom. In this case, the first level is the level that corresponds to n=7 and the final level is the one that corresponds to n = 2.

1/λ = RH(1/\(n_{2} ^{2}\) - 1/\(n_{1} ^{2}\))

Now we also know that the RH is called the Rydberg constant and it has the value of 1.097 * 10^7 m

Thus;

1/λ =  1.097 * 10^7(1/2^2 - 1/7^2)

1/λ =  1.097 * 10^7(1/4 - 1/49)

1/λ = 1.097 * 10^7(0.25 - 0.02)

λ = 3.96 * 10^-7 m or 396 nm

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The  name of the organic compound with structural formula of nine carbons and sixteen hydrogens  depends on different factors

The nomenclature of the organic molecule comprising nine carbons and sixteen hydrogens is determined by the arrangement of its atoms as well as the nature of the chemical bonds linking them together. Cyclononane is a circular formation of nine carbon atoms.

An organic substance belongs to a group of chemicals that have carbon atoms linked to each other and other atoms through covalent bonds, and are present in the biological cells. Organic compounds contain usual elements such as carbon, as well as hydrogen, oxygen, and nitrogen.

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Answer:

stupidddd guhhhhhuiijui

To determine the pH of a solution based on the hydronium ion concentration, you can use the equation:

pH = -log[H₃O⁺]

where [H₃O⁺] is the concentration of hydronium ions.

In this case, the hydronium ion concentration is 6.5x10^-4 M.

Calculating the pH:

pH = -log(6.5x10^-4)

= -log(6.5) - log(10^-4)

= -log(6.5) + 4

Using a calculator or logarithmic tables, you can find that the logarithm of 6.5 is approximately 0.81.

pH ≈ 0.81 + 4

pH ≈ 4.81

Rounding to the nearest whole number, the pH of the solution is approximately 5.

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Answer:

Explanation:

Chemistry is the study of matter and the changes that matter undergoes. Matter is anything that has mass and takes up space.

Answer:

pH of the final solution = 9.15

Explanation:

Equation of the reaction: HCl + NH₃ ----> NH₄Cl

Number of moles of  NH₃ = molarity * volume (L)

= 0.4 M * (300/1000) * 1 L =  0.12 moles

Number of moles of HCl =  molarity * volume (L)

= 0.3 M * (175/1000) * 1 L = 0.0525 moles

Since all he acid is used up in the reaction, number of moles of acid used up equals number of moles of NH₄Cl produced

Number moles of NH₄Cl produced =  0.0525 moles

Number of moles of base left unreacted =  0.12 - 0.0525 = 0.0675

pOH = pKb + log([salt]/[base])

pKb = -logKb

pOH = -log (1.8 * 10⁻⁵) + log (0.0525/0.06755)

pOh = 4.744 + 0.109

pOH = 4.853

pH = 14 - pOH

pH = 14 - 4.853

pH = 9.15

Therefore, pH of the final solution = 9.15

Answer:

a gas exerting a pressure of 400 mm Hg is equivalent to approximately 0.526 atm or 53.4 kPa.

Explanation:

To convert 400 mm Hg to kilopascals or atmospheres, we can use the following conversion factors:

1 atm = 101.325 kPa

1 atm = 760 mm Hg

Therefore, we can first convert 400 mm Hg to atmospheres:

400 mm Hg * (1 atm / 760 mm Hg) = 0.526 atm

And then we can convert 0.526 atm to kilopascals:

0.526 atm * 101.325 kPa / atm = 53.4 kPa

The percentage by mass of hydrogen can be calculated from the problem as 2.016

To calculate the mass percent of an atom in a compound, you first need to determine the molar mass of the compound and the molar mass of the atom of interest.

Determine the molar mass of the compound by adding up the atomic masses of all the atoms in the compound.

Determine the number of moles of the atom of interest in one mole of the compound. This is done by dividing the atomic mass of the atom by the molar mass of the compound.

We know that the relative molecular mas of the compound is; 300 g/mol

Then;

Percent by mass of hydrogen is; 6/300 * 100/1

= 2.016%

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The heat that is absorbed by the system is  1363 J. Option B

We know that in a chemical reaction that there could be the absorption or the evolution of heat. We say that there is the evolution of heat when heat has been lost from the system and there is the absorption of heat when heat has been gained by the system.

Number of moles of the barium hydroxide hydrate = 3.15 g/203 g/mol

= 0.015 moles

Number of moles of the ammonium thiocyanate = 1.52/76 g/mol

= 0.02 moles

If 1 mole of barium hydroxide hydrate reacts with 2 moles of  ammonium thiocyanate

0.015 moles of barium hydroxide hydrate reacts with 0.015 * 2 moles/1 mole

= 0.03 moles

Hence the limiting reactant is the ammonium thiocyanate.

Now the heat that is absorbed is;

H = mcdT

m = mass of the water

c = Heat capacity

dT = Temperature change

H = 100 * 4.20 * 3.1

H = 1363 J

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The number of moles of CO in the given conditions is 2.51 moles. To calculate the number of moles of CO in the given conditions, we need to use the Ideal Gas Law equation:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

First, we need to convert the given temperature in Celsius to Kelvin by adding 273.15:

T = 93°C + 273.15 = 366.15 K

Now we can plug in the values we have:

P = 4.52 atm

V = 20.0 L

R = 0.0821 L.atm/mol.K (gas constant for CO)

T = 366.15 K

n = PV/RT = (4.52 atm x 20.0 L)/(0.0821 L.atm/mol.K x 366.15 K) = 2.51 moles

Therefore, the number of moles of CO in the given conditions is 2.51 moles.

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Answer:

87.6 %

Explanation:

Step 1: Write the balanced equation

LiOH + KCl ⇒ LiCl + KOH

Step 2: Calculate the theoretical yield of LiCl

We will use the following relations:

The theoretical yield of LiCl from 20.0 g of LiOH is:

\(20.0gLiOH \times \frac{1molLiOH}{23.95gLiOH} \times \frac{1molLiCl}{1molLiOH} \times \frac{42.39gLiCl}{1molLiCl} = 35.4gLiCl\)

Step 3: Calculate the percent yield of LiCl.

We will use the following expression.

\(\%yield = \frac{real\ yield}{theoretical\ yield} \times 100\% = \frac{31.0g}{35.4g} \times 100\% = 87.6 \%\)

Answer:

88.6%

Explanation:

Hello,

In this case, considering the given reaction, we notice a 1:1 molar relationship between lithium hydroxide (molar mass=23.95 g/mol) and lithium chloride (molar mass=42.394 g/mol), for that reason, we are able to compute the theoretical yield of lithium chloride by stoichiometry:

\(m_{LiCl}^{theoretical}=20.0gLiOH*\frac{1molLiOH}{23.95gLiOH}*\frac{1molLiCl}{1molLiOH} *\frac{42.394 gLiCl}{1molLiCl}=35.4gLiCl\)

Next, by knowing the actual yield of 31.0 g, we compute the percent yield as:

\(Y=\frac{m_{LiCl}^{actual}}{m_{LiCl}^{theoretical}} *100\%=\frac{31.0g}{35.4g}*100\%\\ \\Y=87.6\%\)

Therefore, among the given, the answer should be 88.6%

Best regards.

A reversible chemical equation starts with the reactants starting the reaction and forming the products, but also we see the products doing the same thing but now they are forming the reactants back again. In the beginning of the reaction we have a lot of reactant forming products, but as time passes by, the rate of formation for both reactant and product will reach an equilibrium, since neither of them is changed by adding or reducing reactants or products

Answer:

\(\boxed {\boxed {\sf 8.22 \ \textdegree C}}\)

Explanation:

The question asks us to calculate the temperature of the gas at the higher volume. Since the pressure is constant, we are only concerned about volume and temperature. We will use Charles's Law. This states that the volume of a gas and the temperature of the gas have a directly proportionate relationship. The formula is:

\(\frac {V_1}{T_1}= \frac{V_2}{T_2}\)

The gas starts at a volume of 4.17 liters and a temperature of 7.62 degrees Celsius.

\(\frac {4.17 \ L}{7.62 \textdegree C} = \frac{V_2}{T_2}\)

The gas is expanded to a new volume of 4.50 liters, but the temperature is unknown.

\(\frac {4.17 \ L}{7.62 \textdegree C} = \frac{4.50 \ L}{T_2}\)

We want to solve for the temperature at a higher volume. We must isolate the variable T₂. Cross multiply. Multiply the first numerator and second denominator, then the first denominator and second numerator.

\(4.17 \ L * T_2 = 4.50 \ L * 7.62 \textdegree C\)

The variable is being multiplied by 4.17 liters. The inverse of multiplication is division. Divide both sides by 4.17 L.

\(\frac {4.17 \ L * T_2 }{4.17 \ L}= \frac{4.50 \ L * 7.62 \textdegree C}{4.17 \ L}\)

\(T_2=\frac{4.50 \ L * 7.62 \textdegree C}{4.17 \ L}\)

The units of liters (L) cancel.

\(T_2=\frac{4.50 * 7.62 \textdegree C}{4.17 }\)

\(T_2=\frac{34.29}{4.17 } \textdegree C\)

\(T_2=8.22302158273 \textdegree C\)

The original measurements of liters and temperature have 3 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place.

The 3 to the right in the thousandth place tells us to leave the 2 in the hundredth place.

\(T_2 \approx 8.22 \ \textdegree C\)

The temperature of the gas at the higher volume is approximately 8.22 degrees Celsius.

To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent.

Effect of Solvent:

H2O = most soluble

alcohol = least soluble

glycerin = intermediate solubility

The salt is most soluble in water because salt is an ionic compound and water is a polar solvent. "Like dissolves like" means that substances with similar polarity and intermolecular forces tend to dissolve each other. Water is a polar solvent, meaning it has a partial positive charge on one end and a partial negative charge on the other, while salt is an ionic compound made up of positively and negatively charged ions. The partial charges on the water molecule can interact with the ions of salt, causing the salt to dissolve.

The choice of solvent affects the dissolving process because it determines the ability of the solvent to interact with the solute. Solvents that are similar in polarity and intermolecular forces to the solute tend to dissolve the solute more easily.

Effect of Pulverizing:

crystal = longest dissolving time

pulverized = shortest dissolving time

The dissolving rates are different because pulverizing the salt increases its surface area, exposing more salt to the solvent and allowing for a greater opportunity for the solute-solvent interactions to occur.

Effect of Temperature:

cold = longest dissolving time

hot = shortest dissolving time

Increasing the temperature of the solvent increases the kinetic energy of the solvent molecules, which leads to more frequent and energetic collisions with the solute particles, resulting in faster dissolving rates.

Effect of Stirring:

stirred = shorter dissolving time

unstirred = longer dissolving time

Stirring increases the rate of the dissolving process by helping to disperse the solute particles evenly throughout the solvent, increasing the surface area of the solute that is in contact with the solvent, and promoting the mixing of the solute and solvent.

Conclusions:

To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent, and stir the solution to disperse the solute particles evenly throughout the solvent.

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Answer:

In a lab, a student mixes 25.0 ml of 0.115 M aluminum sulfate with 34.0 ml of 0.0975 M Lead (III) nitrate. Calculate the grams of the precipitate that is formed.

Explanation:

The table that can depict the compound is given below

Sodium +1 Na+ Chloride -1 Cl-

Potassium +1 K+ Oxide -2 O2-

Calcium +2 Ca2+ Nitride -3 N3-

Magnesium +2 Mg2+ Sulfide -2 S2-

Ionic compounds are the compounds made up of ions that form charged particles when an atom gains or loses electrons. A cation is an ion charged positively; an anion is an ion charged negatively.

In this table, the first column lists the names of the ions, the second column shows their corresponding charges, and the third column displays their ion formulas.

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1) List the quantities.

Sample: 700 g Ni3(PO3)2

2) Convert gramas of Ni3(PO3)2 to moles of Ni3(PO3)2.

The molar mass of Ni3(PO3)2 is 334.0241 g/mol.

3) Convert moles to particles.

1 mol = 6.022*10^23 particles.

700 g Ni3(PO3)2 is equal to 1.26*10^24 particles.

Answer:

It sounds like the writer's experiences of scouting have had a profound impact on his life. He values the connection with nature and the skills he learnt, as well as the importance of preserving the environment for future generations. He also mentions the words and phrases associated with scouting, which he says can act as a reminder of the experience and the joy he felt during his time in the Scouts. It's clear that the writer values the experiences of scouting and has a strong appreciation for the outdoors.

He is incorrect. Carrie mixed the 1M solution correctly

To make 1 M (molar) solution of a substance, you need to dissolve an amount of that substance in a solvent to make a solution with a concentration of 1 mole per liter (1 mol/L). The specific steps for making a 1 M solution will depend on the substance being dissolved and the solvent used.

Once the substance is completely dissolved, add more solvent to the flask until the desired volume is reached. Use a volumetric flask to ensure that the final volume is accurate.

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Answer:

Now she multiplies by 0.5556

Explanation:

The following math operation and report your answer to the

correct number of significant digits is. 4.013×10^-2

now we have given 10.000-9.768/5.78,

we have to find correct significant digits

10.000-9.768 ÷5.78

=0.232÷5.78

=0.04013, it has 4 significant figure

we have to write in significant digit

so 0.04013 = 4.013×10^-2

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Answer:D

Explanation:

The majority of explosives that forensic scientists deal with in investigations are homemade bombs. Therefore, option D is correct.

In general, forensic scientists do the following kinds of work: They examine tangible materials gathered from crime sites. They offer forensic expert testimony both before and during court proceedings. Blood, hair, and other trace evidence are gathered by investigators and sent to crime labs for analysis.

Criminalists or crime scene investigators are generalist forensic science technicians that gather evidence at the scene of a crime and conduct scientific and technical examination in labs or offices.

A forensic scientist's key responsibilities include gathering evidence at the crime scene, documenting the findings in reports, processing the evidence at the lab, and giving testimony in court.

Thus, option D is correct.

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Answer:

batteries

Explanation:

bc they're powered by energy

Answer:

Explanation:

                             HERE WE TAKE CH3,

                      C = 1 × 12 = 12g

                      H₃= 3 × 1  = + 3g

                          CH3       =15 g ans  

A muffi n recipe calls for cream of tartar, or potassium hydrogen tartrate. The amount of cream of tartar that is required contains 2.56 ×10²³atoms of carbon. 0.42moles of potassium hydrogen tartrate is required

In the Global System of Units (SI), the mole represents the unit of material quantity. How many fundamental entities of a particular substance are present within an object a sample is determined by the quantity of that material. An elementary entity can be a single atom, a molecular structure, an ion, a charged particle pair, or a particle that is subatomic like a proton depending on the makeup of the substance.

For instance, despite the fact that the two substances have different volumes and masses, 10 moles of water because 10 moles of the chemical element mercury both contain the same quantity of stuff, because the mercury comprises exactly one particle for each molecule of water.

mole = 2.56 ×10²³/ 6.022×10²³

       = 0.42moles

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