Determine the pH of a 0.35 M aqueous solution of CH3NH2 (methylamine). The Kb of methylamine is 4.4 × 10−4.
can you please show your work and explain the steps on how you get 12.09 as the answer

To set up a vacuum filtration system, you will need a Büchner flask (labeled as "B") and a Büchner funnel (labeled as "F").

To set up the vacuum filtration system, follow these steps:
1. Choose the Büchner flask (B) and Büchner funnel (F) from the listed glassware.

2. Place a filter paper inside the Büchner funnel (F) so it covers the perforated base.

3. Attach one end of a rubber tubing to the sidearm of the Büchner flask (B) and the other end to the vacuum source.

4. Pour the liquid-solid mixture into the Büchner funnel (F) and turn on the vacuum.

5. The vacuum will pull the liquid through the filter paper, leaving the solid residue on the filter paper.

6. Once the filtration is complete, turn off the vacuum source and carefully remove the filter paper with the solid residue.

By using the Büchner flask (B) and Büchner funnel (F) together, you can efficiently separate the solid and liquid components of a mixture using vacuum filtration.

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Answer:

protons=electrons=9(atomic number)

Neutrons=19-9=10(math number-atomic number)

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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Adenine is the purine base that forms three hydrogen bonds when binding its complementary nucleotide base.

Purines are a kind of nucleotide base.

They are natural aromatic organic compounds that have nitrogen atoms at positions 1 and 3 in their pyrimidine rings. Purines are nucleotides essential structural elements, which are used to create DNA and RNA.

Pyrimidine and purine are two types of nitrogenous bases found in nucleotides.

A nucleotide consists of a five-carbon sugar, a phosphate group, and a nitrogenous base.

Nitrogenous bases are a type of molecule that includes nitrogen atoms.

Pyrimidines, such as cytosine, thymine, and uracil, have a single ring of carbon and nitrogen atoms.

The purines, adenine and guanine, have a double ring of carbon and nitrogen atoms.

In DNA and RNA, nitrogenous bases are arranged in complementary pairs, and hydrogen bonds link the complementary bases.

Adenine (A) pairs with thymine (T) in DNA and uracil (U) in RNA.

On the other hand, guanine (G) pairs with cytosine (C) in both DNA and RNA.

Adenine forms hydrogen bonds with thymine, and guanine forms hydrogen bonds with cytosine.

The adenine-thymine combination has two hydrogen bonds, while the guanine-cytosine combination has three hydrogen bonds.

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Answer:

The answer is "Option B"

Explanation:

when we react with FeCl, iron, and chloride to both the electrolysis. So, iron is charged positive ion, as well as passes to the negative, is cathode electrode. But there is a decrease in the cathode.

The equation can be defined as follows:

\(FeCl_2\) \(\longrightarrow\)\(Fe + Cl_2\)

In the above equation, when the iron chloride electrolysis solution, it will give the iron(II) and the chlorine. This process happens when the hydrogen chloride solution at a temperature of about 90 ° C.

Answer: D

Explanation: As Fe is positive charged while chlorine is negative charged.

(D) is correct. As iron moves to negative and it get reduce as negative electrode is cathode

The enthalpy of the reaction as written is approximately 239,306 J/mol.

To calculate the enthalpy of the reaction, we need to use the heat released (2330 J) and the amount of sodium reacted (0.224 g) to determine the heat released per mole of sodium reacted.

The molar mass of sodium (Na) is 22.99 g/mol.

First, we need to calculate the number of moles of sodium reacted:

Number of moles of Na = Mass of Na / Molar mass of Na

Number of moles of Na = 0.224 g / 22.99 g/mol ≈ 0.00974 mol

Next, we can calculate the enthalpy change (ΔH) per mole of sodium reacted:

ΔH = Heat released / Number of moles of Na

ΔH = 2330 J / 0.00974 mol ≈ 239306 J/mol

Enthalpy (H) is a thermodynamic property that represents the total heat content of a system at constant pressure. It includes the internal energy of the system plus the product of pressure and volume. Enthalpy is often used to describe heat changes in chemical reactions, where the difference in enthalpy between the reactants and products determines whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). Enthalpy is typically measured in joules (J) or kilojoules (kJ).

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Answer:Mendeleev realized that the physical and chemical properties of elements were related to their mass in a ‘periodic’ way.

Explanation: He arranged them so that the groups of elements with similar properties fell into vertical columns.

Hope this helped love !!

Answer:

Yes

Explanation:

Bromine is a much more powerful oxidizing agent than iodine. Bromine can remove electrons from iodide ions.

Answer:

\(\large \boxed{\text{0.88 L}}\)

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

\(p_{1}V_{1} = p_{2}V_{2}\)

Data:

\(\begin{array}{rcrrcl}p_{1}& =& \text{1.34 atm}\qquad & V_{1} &= & \text{ 0.56 L} \\p_{2}& =& \text{0.85 atm}\qquad & V_{2} &= & ?\\\end{array}\)

Calculations:  

\(\begin{array}{rcl}\text{1.34 atm} \times \text{0.56 L} & =& \text{0.85 atm} \times V_{2}\\\text{0.750 L} & = & 0.85V_{2}\\V_{2} & = &\dfrac{0.750}{0.85}\\\\& = &\textbf{0.88 L}\\\end{array}\\\text{The balloon's new volume is $ \large \boxed{\textbf{0.88 L}}$}\)

The amount of lithium nitrate that will be needed to make 350.00 grams of lithium sulfate is equal to 438.84 g.

A limiting reagent can be demonstrated as the reactant in the reaction which is exhausted first while the completion of a chemical reaction.

The limiting reagent in a particular reaction decides the yield of the product whenever the reactants will not be taken in stoichiometry.

Given, chemical reaction of  lithium nitrate and lead sulfate is:

Pb(SO₄)₂ + 4 LINO₃ →  Pb(NO₃)₄+ 2 Li₂SO₄

The mass of the lithium sulfate = 350 g

The number of moles of lithium sulfate = 350/109.94 = 3.18 mol

The 2 moles of lithium sulfate react with lithium nitrate = 4

Then 0.233 moles of lithium sulfate react with lithium nitrate = 4/2 × 3.18 = 6.36 mol

The mass of the lithium nitrate = 69 × 6.36 = 438.84 g

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Answer:

Since the foil has a mass of 830 g, you can use the density to find its volume 830g ⋅ 1 cm3 2.70g = 307.4 cm3 You now know that the volume of the foil is

Explanation:

The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: ρ=m/V where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, although this is scientifically inaccurate – this quantity is more specifically called specific weight.

Explanation:

Metals conduct electricity, while non-metal do not conduct electricity.

Answer:

Fullerene, also called buckminsterfullerene, any of a series of hollow carbon molecules that form either a closed cage (“buckyballs”) or a cylinder (carbon “nanotubes”).

Explanation:

A fullerene is an allotrope of carbon whose molecule consists of carbon atoms connected by single and double bonds to form a closed or partially closed mesh, with fused rings of five to seven atoms. The molecule may be a hollow sphere, ellipsoid, tube, or many other shapes and sizes.

Answer:

khansamueen has already provided an answer.  This is an additional note on the many structures carbon may form, called allotropes.

Explanation:  Carbon can take on many forms.  They are all based only on the carbon atom, and are thus called alloptropes.  One of these is diamond, "a" in the attached image.  

The wavelength corresponding to a frequency of 1.45 x \(10^{15}\)  s^-1 is approximately 207 nm.

wavelength (λ) = speed of light (c) / frequency (ν)

The speed of light (c) is approximately 3.00 x \(10^{8}\)  m/s. First, convert the frequency to Hz:

Frequency (ν) = 1.45 x \(10^{15}\)  Hz

Now, use the equation:

λ = (3.00 x \(10^{8}\)  m/s) / (1.45 x \(10^{15}\)  Hz)

λ ≈ 2.07 x \(10^{-7}\)  m

Finally, convert the wavelength to nanometers (1 meter = 1 x \(10^{9}\)  nm):

λ ≈ 2.07 x \(10^{-7}\)  m * (1 x \(10^{9}\)  nm/m) = 207 nm

So, the wavelength corresponding to a frequency of 1.45 x \(10^{15}\)  s^-1 is approximately 207 nm.

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a. Decreasing alpha from 0.05 to 0.01 makes the significance level more stringent. You will be less likely to reject the null hypothesis, even when it's false. This increases the probability of a Type II error, thus potentially reducing the power of the test. The power curve will shift to the left.

b. If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.

The power curve is a graph that shows the probability of rejecting the null hypothesis as a function of the true value of the mean.

In the given scenarios of this study, Reducing the significance level and reducing the sample size will shift the power curve to the left, indicating a decrease in the statistical power of the test.

The power of a statistical test is the probability that it correctly rejects the null hypothesis when the alternative hypothesis is true.

a) Reducing alpha from 0.05 to 0.01 means that we are more stringent in our assessment of whether the new treatment is effective.

This will result in a decrease in the power of the test, meaning that it is less likely that we will be able to detect a difference between the new treatment and the previous treatment.

b) If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.

This is because a smaller sample size decreases the power of the test. A larger sample size provides more information and thus makes it more likely to correctly reject the null hypothesis when the alternative hypothesis is true.

Therefore, by reducing the sample size, you are decreasing the likelihood of detecting a true effect if one exists, thus reducing the power of the test.

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Explanation:

Copper (II) sulfate is usually present as a hydrous state, which is of the form CuSO4 * nH2O, where n is a whole number.

Mass of sample (CuSO4 * nH2O)

= 152.00g - 128.10g = 23.90g.

Mass of water loss during heating

= 152.00g - 147.60g = 4.40g.

Molar mass of H2O = 18g/mol

Moles of H2O in sample

= 4.40g / (18g/mol) = 0.244mol.

Mass of anhydrous sample (CuSO4)

= 23.90g - 4.40g = 19.50g

Molar mass of CuSO4 = 159.61g/mol

Moles of CuSO4 in sample

= 19.50g / (159.61g/mol) = 0.122mol.

Since mole ratio of CuSO4 to H2O

= 0.122mol : 0.244mol = 1:2, n = 2.

Hence we have CuSO4 * 2H2O.

Answer:

Copper(II) Sulphate (CuSO4.7H2O) is generally present in a hydrated form.

Mass of the CuSO4.7H2O sample before heating

(152.00-128.10)g = 23.90 grams

Mass of the water loss due to heating

(152.00-147.60)g = 4.40 grams

The enthalpy change (∆H°) for the given reaction is -923.6 kJ/mol. We used Hess's law to calculate the enthalpy change for the given reaction by breaking it down into individual steps and using the enthalpies of formation of the reactants and products.

To calculate ∆h° for the given reaction, we need to use Hess's law, which states that the enthalpy change of a reaction is equal to the sum of the enthalpy changes of the individual steps of the reaction.
Firstly, we need to write the equation in terms of the enthalpies of formation of the reactants and products:
2 Na(s) + 2 H2O(l) → 2 NaOH(s) + H2(g)
Using the enthalpies of formation (∆Hf°) given, we can calculate the enthalpy change (∆H°) for each step of the reaction:
∆H°f(NaOH) = -426.7 kJ/mol
∆H°f(H2O) = -285.8 kJ/mol
∆H° = 2∆H°f(NaOH) + ∆H°f(H2) - 2∆H°f(H2O)
∆H° = 2(-426.7) + 0 - 2(-285.8)
∆H° = -923.6 kJ/mol
In conclusion, we used Hess's law to calculate the enthalpy change for the given reaction by breaking it down into individual steps and using the enthalpies of formation of the reactants and products.

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by rounding them to the neerest 10

Answer:

15.8 m/s

Explanation:

v= u+at

v= 32+(-1.5×10.8)

v=32-16.2

v=15.8m/s

Answer:Intermolecular forces

Explanation:See in a molecule these intermolecular forces hold the atoms together which decides the rigidity of the material.

I hope the answer was helpful

Answer:

it will fall then rise and return to ×

Answer:

COCl2 + H2O = 2 HCl + CO2

\(COCl_2 + H_2O\) → 2\(HCl + CO_2\) is the balanced equation.

The Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that the total mass on the reactant side must be equal to the total mass on the product side.

While balancing a chemical reaction first balance the atoms of other elements and then in the end balance oxygen atoms.

Hence, \(COCl_2 + H_2O\) → 2\(HCl + CO_2\) is the balanced equation.

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The ΔH for the given gas phase reaction is -4 kJ/mol, indicating an exothermic reaction where heat is released.

To calculate ΔH (enthalpy change) for the gas phase reaction NH3(g) + Cl2(g) → NH2Cl(g) + HCl(g), we need to subtract the sum of the bond energies of the reactants from the sum of the bond energies of the products.

The given bond energies are as follows:

N-H = 389 kJ/mol

N-Cl = 201 kJ/mol

H-Cl = 427 kJ/mol

Cl-Cl = 243 kJ/mol

In the reactants:

NH3 contains three N-H bonds and Cl2 has one Cl-Cl bond.

In the products:

NH2Cl contains two N-H bonds and one N-Cl bond, and HCl has one H-Cl bond.

Calculating the bond energy changes:

Reactants:

3(N-H) + 1(Cl-Cl) = 3(389 kJ/mol) + 1(243 kJ/mol) = 1167 kJ/mol + 243 kJ/mol = 1410 kJ/mol

Products:

2(N-H) + 1(N-Cl) + 1(H-Cl) = 2(389 kJ/mol) + 1(201 kJ/mol) + 1(427 kJ/mol) = 778 kJ/mol + 201 kJ/mol + 427 kJ/mol = 1406 kJ/mol

ΔH = (sum of bond energies of products) - (sum of bond energies of reactants)

ΔH = 1406 kJ/mol - 1410 kJ/mol = -4 kJ/mol

Therefore, the ΔH for the given gas phase reaction is -4 kJ/mol, indicating an exothermic reaction where heat is released.

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The variance in the US continental region is brought on by the shift in daytime and nighttime weather patterns.

Cold, dry, and stable air masses are found in the continental polar (cP) or continental arctic (cA) regions. Radiative cooling causes these air masses to form over northern Canada and Alaska. They travel south, then east via the Plains and the Rockies.

During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south. Low humidity and temperature are both present.

These factors contributed to the polar air mass:

During the colder months of the year, continental polar air typically forms over vast land masses.

A cool breeze blows across the upper section of the area, while a warm breeze blows through the lower part.

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The answer is: The overall charge of the electron cloud is negative,

Electron: Electron is a sub-atomic particle which is found outside the nucleus of an atom. The charge carried by an electron is negative.

What is the electron cloud and who suggest this idea?

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As the fuel burns, chemical reactions occur within the fuel, breaking up molecules, forming new molecules, and releasing energy. The energy released allows parts of the engine to move. The chemical energy is all transformed into thermal and mechanical energy.

Mechanical energy is the sum of potential energy and kinetic energy that an object has due to its motion and position. It is the energy associated with the motion and position of an object.

For example, when a person lifts a weight and holds it above the ground, the person has done work and has increased the object's potential energy. This potential energy is converted to kinetic energy when the person releases the weight and it falls. The kinetic energy of the falling weight is converted to other forms of energy, such as sound and heat, when it strikes the ground.

On the other hand, when a car is accelerating, it is converting its chemical energy (from the gasoline) into mechanical energy. This mechanical energy is then used to move the car forward. The mechanical energy is then converted to other forms of energy, such as heat and sound, when the car brakes.

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i) A is to B: hypoosmotic (Solution A has a lower osmolarity compared to Solution B). ii) B is to A: hyperosmotic (Solution B has a higher osmolarity compared to Solution A)

iii) A is to C: isosmotic (Solution A and Solution C have the same osmolarity)

iv) C is to A: isosmotic (Solution C and Solution A have the same osmolarity)

When you drink water, the osmolarity of body fluids will decrease. This is because water is a hypotonic solution compared to body fluids.

Hypotonic refers to a solution that has a lower solute concentration compared to another solution or a reference solution. In a hypotonic solution, there is a higher concentration of water molecules relative to solute particles.

By drinking water, you are diluting the solute concentration in the body, leading to a decrease in osmolarity. Therefore, the values related to osmolarity, such as the concentration of solutes in the body fluids, would decrease.

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The type of pollutant in waterways which can be toxic at high levels is nitrates.

Pollutant is a substance that is introduced into the environment and has negative effects on living organisms and the environment. It can be either natural or man-made and can include air pollutants such as carbon dioxide, sulfur dioxide, nitrogen oxides, and particulate matter, as well as water pollutants such as nutrients, heavy metals, and toxic chemicals.

Nitrates are nitrogen-containing compounds and are often found in fertilizers, wastewater and agricultural runoff. Nitrates can lead to oxygen depletion in water and can be harmful to aquatic life and humans if consumed in high amounts. The River Avon in Warwickshire is known to have high levels of nitrates due to agricultural runoff.

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It is possible for citric acid and baking soda to create water because they are both chemical compounds that can react with each other to create new compounds.

When citric acid and baking soda are mixed together, they undergo a chemical reaction known as a neutralization reaction. This type of reaction occurs when an acid and a base react to form salt and water.

In this case, citric acid is an acid and baking soda is a base. When they are mixed together, the acid and base neutralize each other, creating a salt compound and water. The acid and base cancel out each other's properties and neutralize the solution. The acid donates a proton (H+) to the base, and the base accepts it to form water.

The gas that was measured by the students, is the carbon dioxide (CO2) that is produced as a byproduct of this reaction. As the acid and base react, they release carbon dioxide gas, which is 4.2 grams more than they had at the start. The reaction can be written as follows:

\(C_{6}\)\(H_{8}\)\(O_{7}\) \(_{(aq)}\) + \(NaHCO_{3}\) \(_{(s)}\) → \(NaC_{6}\)\(H_{5}\)\(O_{7}\) \(_{(aq)}\) + \(H_{2} O\) \(_{(l)}\) + \(CO_{2}\) \(_{(g)}\)

In conclusion, citric acid and baking soda produce water and carbon dioxide (CO2) when they react together in a neutralization reaction. The reaction creates a new compound, salt, and water, while the gas created is carbon dioxide.

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