What is the correct equilibrium expression for the dissociation of the base pyridine:


C5H5N + H2O â C5H5NH+ + OH-



A. Kb = [C5H5NH+][OH-] / [C5H5N]


B. Kb = [C5H5N][OH-] / [C5H5NH+][H2O]


C. Kb = [C5H5NH+][OH-] / [C5H5N][H2O]


D. Kb = [C5H5NH+][C5H5N] / [OH-]


E. Kb = [C5H5N][OH-] / [C5H5NH+]

Answer:

B: 1s²2s²2p¹

Na: 1s²2s²2p⁶3s¹

Explanation:

A = 2

B = 1

C = 2

D = 6

E = 1

Hope that helps.

Answer:

B: 1s2 2sA2pB

A = 2

B = 1

Na: 1s22sC2pD3sE

C = 2

D = 6

E = 1

Answer:

2.268

Explanation:

5 lb × 0.45359237 = 2.26796185 kg

How to convert Pounds to Kilograms

1 pound (lb) is equal to 0.45359237 kilograms (kg).

1 lb = 0.45359237 kg

The mass m in kilograms (kg) is equal to the mass m in pounds (lb) times 0.45359237:

m(kg) = m(lb) × 0.45359237

Example

Convert 5 lb to kilograms:

m(kg) = 5 lb × 0.45359237 = 2.268 kg

Hope this helped!!!

Answer:

2.26796 kg

Explanation:

The mass of CH4 consumed when 587.9 kJ of energy is evolved is approximately 10.58 g.

To determine the mass of CH4 consumed in the combustion of a mixture of CH4(g) and O2(g), we need to use the balanced chemical equation for the reaction. The balanced equation for the combustion of CH4 is:

CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g)

From the equation, we can see that one mole of CH4 reacts with two moles of O2 to produce one mole of CO2 and two moles of H2O.

First, we convert the given energy value of 587.9 kJ to moles of CH4 using the enthalpy change of combustion for CH4, which is -890.3 kJ/mol.

587.9 kJ / -890.3 kJ/mol

= -0.66 mol

Since the stoichiometry of the balanced equation shows that one mole of CH4 reacts to produce one mole of CO2, the moles of CH4 consumed is also -0.66 mol.

Finally, we can calculate the mass of CH4 consumed using its molar mass, which is 16.04 g/mol.

Mass of CH4 = -0.66 mol * 16.04 g/mol

= -10.58 g

Therefore, the mass of CH4 consumed when 587.9 kJ of energy is evolved is approximately 10.58 g.

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160 ml of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

We can use the idea of ​​percent concentration to determine how many grams of amino acids are present in 160 mL of a 4.0% (m/v) amino acid solution. Expressed by the mass percent concentration of the solute (amino acid) per 100 ml of solution. Since the solution in this example is 4.0% (m/v), 100 mL of solution contains 4.0 g of the amino acid.

We can make a ratio to determine how many grams are in 160 ml:

4.0 grams / 100 ml = x grams / 160 ml

When we cross multiply for x, we get:

x = (4.0 grams / 100 ml) * 160 ml

x = (0.04) * 160

x = 6.4 grams

Consequently, 160 mL of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

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Answer:

Explanation:

it is 980

A buffer of 300 ml of 100 mM Tris pH 7.8 and 250 mM NaCl can be prepared by dissolving 3.64 g of Tris and 4.27 g of NaCl in 300 ml of water, and adjusting the pH to 7.8 using 10 ml of 1 M HCl. The % v/v refers to the volume of the solute while % w/v refers to the weight of the solute.

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The correct question would be as

How do you prepare 300 ml buffer of 100 mM Tris pH 7.8 and 250 mM NaCl? % v/v,% w/v Questions.

Answer:

Ga3+ is a gallium cation

Answer:

I'm pretty sure you have it correct

Answer:

The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control of the body and communication among its parts.

Brain, spinal cord, retina, sensory neurons, ganglia, as well as nerves are the primary organ of the nervous system.

Nervous system: a network of organized cells with the specific purpose of carrying electrochemical inputs from sensory receptors to the location where a reaction takes place.

Every living thing has the capacity to recognize changes in both its own surroundings and outside it. Changes in the inner environment include those in the posture of the head and limbs as well as those in the internal organs, whereas changes in the exterior environment include those in light, temperature, sound, motion, as well as odor. The nervous system's organs include the brain, spinal cord, retina, sensory neurons, ganglia, as well as nerves.

Therefore,  brain, spinal cord, retina, sensory neurons, ganglia, as well as nerves are the primary organ of the nervous system.

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Answer:

line graph

Explanation:

The type of graph would be used to display the data is line graph.

Graph is defined as a visual representation, such as a picture or diagram, that shows information or values in a structured way.  The graph's goal is to visually represent numerical data so that it can be quickly, simply, and clearly understood. As a result, graphs are visual displays of data.

Although a graphical display is easier to understand, data can also be presented as a table. For this kind of data, a line graph will be used. This will show more clearly how the temperature of the water fluctuates over the course of two hours. Time is an independent variable, whereas temperature is a dependent variable.

Thus, the type of graph would be used to display the data is line graph.

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Answer:

the main cause of climate change is burning fossil fuels such as oil, gas, and coal. When burnt, fossil fuels release carbon dioxide into the air, causing the planet to heat up.

Explanation:

Answer:

You can find the volume of an irregular object by immersing it in water in a beaker or other container with volume markings, and by seeing how much the level goes up. You can use this relation backwards too -- if you know what material an object is made of, you can look up its density in a book. hOPE THIS HELPS! =)

The answer is \(\underline{12.954}\end{aligned}$$\)

\(\begin{aligned}&\mathrm{pH}=\underline{1.046} \\&{\left[\mathrm{OH}^{-}\right]=\underline{1.11 \times 10^{-13} \mathrm{M}}} \\&\mathrm{pOH}=\underline{12.954}\end{aligned}\)

Given:

\(\left[\mathrm{H}^{+}\right]=0.090 \mathrm{M}=9 \times 10^{-2} \mathrm{M} ; \mathrm{T}\\=25^{\circ} \mathrm{C}$$\mathrm{As}, \mathrm{pH}=-\log \left[\mathrm{H}^{+}\right]$\Rightarrow \mathbf{p H}=-\log \left(9 \times 10^{-2}\right)=\underline{1.046}$$\)

The equation for the self-ionization constant of water is

\($$\mathrm{Kw}=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]$$and, $\mathrm{pKw}=\mathrm{pH}+\mathrm{pOH}$\)

Since at room temperature,

\($25^{\circ} \mathrm{C}: \mathrm{Kw}=1.0 \times 10^{-14}, \mathrm{pKw}=14$\)

\(\therefore \mathrm{Kw}=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]=1.0 \times 10^{-14}$$\\\Rightarrow\left[\mathrm{OH}^{-}\right]=\left(1.0 \times 10^{-14}\right) \div\left[\mathrm{H}^{+}\right]\\=\left(1.0 \times 10^{-14}\right) \div\left[9 \times 10^{-2}\right]\\=0.111 \times 10^{-12}=1.11$$\times 10^{-13} \mathrm{M}$\)

And

\($$\begin{aligned}&\mathrm{pH}+\mathrm{pOH}=\mathrm{pKw}=14 \\&\Rightarrow \mathrm{pOH}=14-\mathrm{pH}=14-1.046=\underline{12.954}\end{aligned}$$\)

What is Poh and PH linked formula?

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Answer:

about 16

Explanation:

its 20 - ( approximately 5)

= approximately 16

Answer:

It should be (C) about 12cm

Without the specific redox reaction, we cannot determine the element being oxidized.

In the given redox reaction, we need to determine which element is being oxidized. To do this, we compare the oxidation states of the elements before and after the reaction.

Unfortunately, the specific redox reaction is not provided in the question. Without the reaction, we cannot determine the element being oxidized. Please provide the specific redox reaction so that we can analyze it and identify the element being oxidized.

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The specific heat (c) of a substance can be calculated using the equation: Q = mcΔT, where Q is the heat absorbed, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature. In this case, we have a 23.23 g sample of the substance that absorbs 2477 J of heat, resulting in a temperature change of 106.9 °C (129.4 °C - 22.5 °C). By substituting these values into the equation and solving for c, we can determine the specific heat of the substance.

In this scenario, a 23.23 g sample of the substance initially at 22.5 °C absorbs 2477 J of heat, resulting in a temperature increase of 106.9 °C (129.4 °C - 22.5 °C). To determine the specific heat (c) of the substance, we can use the equation Q = mcΔT, where Q is the heat absorbed, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature. By substituting the given values, we have 2477 J = (23.23 g)(c)(106.9 °C). Solving this equation for c, we find that the specific heat of the substance is approximately 1.10 J/g°C.

Therefore, the specific heat of the substance is approximately 1.10 J/g°C. This value indicates the amount of heat energy required to raise the temperature of 1 gram of the substance by 1 degree Celsius.

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Answer:

D

\( \: \: \: \: \)

Answer:

a chemical reaction

Explanation:

What has happened to the statue of liberty is that a chemical reaction has occurred to the materials making up this edifice.

The statue is made up of copper. On reacting with oxygen, it undergoes an oxidation.

This makes the copper to rust and decolorize.

It implies that copper has reacted with oxygen in air and possibly from water.

This gives a new product.

We know this because for most chemical changes, they give new products and are not easily reversible.

Answer:

So everything can be understood universally

Explanation:

Answer:

It is quite known that in case of electrolyte there are no electrons. The electric current is basically due to flow of ions.

The answer to the question indicates that the scientist is engaged in spectroscopy.

(SOH-dee-um) A mineral required by the body to maintain the proper balance of body fluids. Table salt and many processed meals also contain sodium. The body may retain water if it is oversalted.

In some nuclear plants, sodium is employed as a heat exchanger.It is also utilized in the chemical industry as a reagent. Instead, sodium salts are so much more advantageous than sodium alone. Sodium chloride is the most prevalent sodium compound (common salt). It is used to flavor meals and de-ice roadways in the winter.

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Answer:

7.28 moles Ag°

Explanation:

              Cu°          +    2 AgNO₃  => Cu(NO₃)₂ + 2Ag°

Given 7.28 moles     7.28 moles

To determine limiting reactant, divide the mole values by the respective coefficient of balanced equation. The resulting smallest value is the limiting reactant. Note: this is a short cut method for determining limiting reactant only. Once the limiting reactant is determined one must use the given mole values of the limiting reactant to solve problem. That is ...

Limiting reactant determination:

              Cu°          +    2 AgNO₃  => Cu(NO₃)₂ + 2Ag°

Cu: 7.28 / 1  = 7.28

AgNO₃ : 7.28 / 2 = 3.64 => Limiting Reactant is AgNO₃

Solving Problem depends on AgNO₃; Cu will be in excess.

Since coefficients of AgNO₃ & Ag° are equal, then the moles AgNO₃ used equals moles Ag° produced and is therefore 7.28 moles Ag°.

The fact that a-halogenations are generally acid-catalyzed does explain why the reaction is often slow at first but then proceeds rapidly. In the presence of an acid catalyst, such as hydrochloric acid (HCl), the acid donates a proton to the halogenating agent, typically a halogen like bromine (Br2).

This protonation step generates a more reactive species, the electrophilic halogen cation (e.g., Br+). This electrophilic species can then attack the substrate, leading to the formation of the halogenated product.

Before the formation of HBr, a process known as homolytic cleavage occurs. In this process, the bond between the hydrogen (H) and bromine (Br) in the acid (e.g., HCl) breaks homolytically, resulting in the formation of two radicals: H• and Br•.

These radicals are highly reactive and can initiate further reactions, including the halogenation process itself.

Overall, the acid-catalyzed a-halogenation reaction involves a series of steps, with the initial homolytic cleavage of the acid and subsequent formation of the electrophilic halogen cation being crucial for the overall reaction to proceed.

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Answer:

B) 1.6 g

Explanation:

**********************************************

To calculate the pH of the reaction  buffer obtained by adding 4.0g NaOH to 1.00L of 0.3M CH3COOH (pKa=4.76), we use the Henderson-Hasselbalch equation.

First, we need to calculate the concentration of CH3COOH before the addition of NaOH. The number of moles of CH3COOH in 1.00L of 0.3M CH3COOH is:moles CH3COOH = Molarity x Volume= 0.3M x 1.00L= 0.3 molesWe can use the balanced chemical equation for the reaction between NaOH and CH3COOH to find the number of moles of CH3COOH and CH3COO- after the addition of NaOH:CH3COOH + NaOH → CH3COO- + H2ONumber of moles of NaOH = mass / molar mass= 4.0g / 40 g/mol= 0.1 molesNaOH is a strong base, so it reacts completely with CH3COOH to form CH3COO- and water:NaOH + CH3COOH → CH3COO- + H2ONumber of moles of CH3COOH remaining = initial moles of CH3COOH - moles of NaOH= 0.3 - 0.1= 0.2 molesNumber of moles of CH3COO- formed = moles of NaOH= 0.1 moles.

Now we can calculate the concentration of CH3COOH and CH3COO-:[CH3COOH] = moles / volume= 0.2 moles / 1.00L= 0.2M[CH3COO-] = moles / volume= 0.1 moles / 1.00L= 0.1MNext, we can use the Henderson-Hasselbalch equation to find the pH of the buffer:pH = pKa + log [A-] / [HA]pKa = 4.76[CH3COOH] = 0.2M[CH3COO-] = 0.1MpH = 4.76 + log (0.1 / 0.2)= 4.76 - 0.301= 4.459.
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