At which pH value does the amino group of amino acid have the best buffering capacity?
a. 6.01
b. 9.00
c. 9.69
d. 3.00
e. 1.53
f. 10.5

Answer:

The more reactive the metal, the more rapid the reaction is. A metal below hydrogen in the reactivity series will not react with dilute acids.

Explanation:

Answer:

Explanation:

Usually when an acid reacts with metal, salt and hydrogen are produced. Acid + metal = salt + hydrogen. Example calcium nitrate + hydrogen. Hope this helps

The empirical formula of the compound is H₅MgSiO₄.

From the given information, we can find the amount of each element in the compound,

Mass of H₂O produced = 25.7 mg = 0.0257 g

Mass of MgO produced = 0.115 g

Mass of SiO₂ produced = 0.172 g

Using the atomic masses of the elements, we can calculate the number of moles of each element:

Number of moles of H = (0.0257 g) / (1.008 g/mol) = 0.0255 mol

Number of moles of Mg = (0.115 g) / (24.305 g/mol) = 0.00473 mol

Number of moles of Si = (0.172 g) / (28.0855 g/mol) = 0.00612 mol

Number of moles of O = (0.115 g + 0.172 g - 0.0257 g) / (15.999 g/mol) = 0.0189 mol

To determine the empirical formula, we need to find the smallest whole-number ratio of the moles of the elements.

Dividing the number of moles by the smallest number of moles (0.00473 mol) gives us the following ratios:

H: 0.0255 mol / 0.00473 mol = 5.40

Mg: 0.00473 mol / 0.00473 mol = 1

Si: 0.00612 mol / 0.00473 mol = 1.29

O: 0.0189 mol / 0.00473 mol = 4

The smallest whole-number ratio we can get from these values is:

H₅MgSiO₄.

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The empirical formula of the compound is \(CdC_{4} H_{6} O_{4}\).

To determine the empirical formula of a compound, we need to find the simplest whole-number ratio of atoms present in the compound. We can calculate this ratio using the given masses of the elements.

Given:

Mass of Cd = 112 g

Mass of C = 48 g

Mass of H = 6.048 g

Mass of O = 64 g

Step 1: Convert the masses of each element into moles using their respective molar masses.

Molar mass of Cd = 112 g/mol

Molar mass of C = 12 g/mol

Molar mass of H = 1 g/mol

Molar mass of O = 16 g/mol

Number of moles of Cd = 112 g / 112 g/mol = 1 mol

Number of moles of C = 48 g / 12 g/mol = 4 mol

Number of moles of H = 6.048 g / 1 g/mol = 6.048 mol

Number of moles of O = 64 g / 16 g/mol = 4 mol

Step 2: Find the simplest whole-number ratio of the moles of each element by dividing each mole value by the smallest mole value.

Ratio of Cd : C : H : O = 1 mol : 4 mol : 6.048 mol : 4 mol

Dividing by 1 mol gives:

Ratio of Cd : C : H : O = 1 mol : 4 mol : 6.048 mol : 4 mol

Approximating to the nearest whole numbers, we get:

Ratio of Cd : C : H : O = 1 : 4 : 6 : 4

Step 3: Write the empirical formula using the simplified ratio.

The empirical formula of the compound is  \(CdC_{4} H_{6} O_{4}\).

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The half-life of carbon-11 is 20 minutes, so after one hour from when the original sample was measured, the amount of carbon-11 left in the sample would be: 6.25 mCi (millicuries).

This can be determined by calculating the decay rate, the amount of carbon-11 present in the sample after 1 hour is equal to the original amount multiplied by (1/2) to the power of the number of half-lives that have elapsed.

In this case, the number of half-lives that have elapsed is 3 (since the half-life of carbon-11 is 20 minutes and 20 minutes x 3 is 1 hour). Therefore, the equation would look like this: 25 mCi x (1/2)^3 = 6.25 mCi. In other words, after 1 hour has passed, there would be 6.25 mCi of carbon-11 left in the sample.

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Answer:

7.83 x 10^23 atoms

Explanation:

Answer:

ether

Explanation:

i got it right on edg 2020 and they use ether in pokemon games to heal PP so that makes logical sense lol

The class of organic compounds that are used in anesthetics is:

A. Ether

It is a functional group consisting of C and O.

Anesthetics are an assorted gathering of medications with especially unique synthetic designs, going from basic inorganic atoms like nitrous oxide to additional perplexing natural specialists.

Organic compound is one that contains a bond with a carbon particle. In ethers, the practical gathering that is available is C=O. Ether, as a fluid, discharges fumes that are breathed in. Another very powerful fluid sedative is propofol, controlled intravenously.

Thus, correct option is A.

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Answer:

The volume is 77 L.

Explanation:

where P is pressure, V is volume, n is moles, R is the gas constant, and T is temperature in Kelvins.

The current STP temperature is 0∘C or 273.15 K (used for gas laws), and the pressure is 105Pa, which most people write as 100 kPa (both pressures are equal).

Measuring tool would you use to measure the area of a football field is used a tender wheel

If you need to measure much longer lengths for example the length of a football pitch then you could use a trundle wheel then you use it by pushing the wheel along the ground and it clicks every time it measures one meter and to measure the football field area then

Area = length×breadth

Area = 90m×45m

Area = 4.05m²

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Answer:

3  1

Explanation:

Answer:

C

Explanation:

Answer:C-CaCl2

Explanation:The answer is C because the chemical formula of calcium chloride is CaCl2.

Answer:

Earth

Explanation:

Answer:

72.0366 gramos de Al

Explanation:

2.67 moles Al* 26.98 gramos Al/ 1 mol Al= 72.0366 gramos de Al

The enthalpy of formation of water vapor at 200°C is -238.5 kJ/mol. This indicates that the formation of water vapor at this temperature is exothermic, meaning that energy is released in the process.

To determine the enthalpy of formation of water vapor at 200°C, we need to first understand what enthalpy and heat are. Enthalpy is a measure of the total energy in a system, including the internal energy and pressure-volume work, while heat is the transfer of energy from one body to another due to a difference in temperature.

Using the constant specific heat for water, cp = 33.6 J/mol·K, we can calculate the change in enthalpy (ΔH) using the formula ΔH = nCpΔT, where n is the number of moles, Cp is the specific heat, and ΔT is the change in temperature.

Assuming we have one mole of water vapor, we can calculate the enthalpy of formation using the following steps:

1. Determine the enthalpy of formation of liquid water at 25°C, which is -285.8 kJ/mol.

2. Calculate the heat required to raise the temperature of liquid water from 25°C to 200°C using the formula Q = nCpΔT. This gives us Q = 1 mol x 33.6 J/mol·K x (200°C - 25°C) = 6608 J.

3. Calculate the enthalpy of vaporization of liquid water at 200°C, which is 40.7 kJ/mol.

4. Calculate the heat required to vaporize one mole of liquid water at 200°C using the formula Q = ΔHvap. This gives us Q = 40.7 kJ/mol.

5. Calculate the enthalpy of formation of water vapor at 200°C using the formula ΔH = ΔHf + Q. This gives us ΔH = -285.8 kJ/mol + 40.7 kJ/mol + 6.608 kJ/mol = -238.5 kJ/mol.

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The pressure of the gas in the container when the volume is 132.5 mL is 465.54 torr (rounded to the nearest 0.01) with units of torr.

To solve this question, we can use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature. Since the sample of neon is at a constant temperature and the number of moles of gas is constant, we can use the equation P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Using the given values, we can write:
P1V1 = P2V2
(757.2 torr) x (81.4 mL) = P2 x (132.5 mL)
Solving for P2, we get:
P2 = (757.2 torr x 81.4 mL) / 132.5 mL
P2 = 465.54 torr
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Answer:

To answer your question one must look at Pascal's relationship between force, area, and Pressure.

Explanation:

\(P=\frac{F}A\)

So we take what I assume is area:

\(A= 5\text{m}^2\)

And I know is force:

\(F=200\text{N}\)

So simply divide them:

\(P=\frac{200\text{N}}{5\text{m}^2}\)

Giving you:

\(P = 40 \text{pascal}\)

So the right answer is 40 Pascal.

look at the attached picture

Hope it will help you

Good luck on your assignment

Answer:

Organizing and displaying data are important in statistics. After data are collected, the data may not make sense just looking at them. That is why it is important to organize and display the data using tables or graphs.

Explanation:

Silica gel loaded with silver nitrate is more effective at retaining unreacted 1-octene than the more polar 1-octanol product due to the presence of silver ions. The silver atom is a Lewis acid.

Silica gel is a synthetic and porous type of silicon dioxide (silica). It is composed of a silicon atom covalently bonded to four oxygen atoms, with a molecular formula of SiO2·nH2O. Silica gel has a porous structure with a high surface area and a high capacity for adsorption. It is used in a variety of industries, including pharmaceuticals, food, and agriculture, to separate and purify compounds from liquids and gases.

Silver nitrate is a white crystalline solid that is extremely soluble in water. Silver nitrate is used as a reagent in many analytical and organic chemistry experiments due to its oxidizing properties. The silver ion is a powerful oxidizing agent and can react with a variety of organic molecules. It is an important reagent in the production of photographic film.

1-Octene is a hydrocarbon with a double bond between the first and second carbons in the chain. It is an unsaturated compound that is used in the production of a variety of chemicals, including plastics, synthetic rubbers, and lubricants.

Silver nitrate loaded silica gel is more effective at retaining unreacted 1-octene than the more polar 1-octanol product due to the presence of silver ions. Silver ions interact with unsaturated hydrocarbons to form complexes that are more stable than the corresponding complexes formed with alcohols. As a result, 1-octene, which is an unsaturated hydrocarbon, is more strongly adsorbed to silver nitrate loaded silica gel than 1-octanol, which is a polar alcohol.

The silver atom is a Lewis acid. It is a type of chemical species that can accept a pair of electrons from a donor molecule, referred to as a Lewis base. A Lewis acid is a compound or ion that can accept a pair of electrons to form a new bond. Silver nitrate is a powerful oxidizing agent and can react with a variety of organic molecules to form complex compounds.

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Chlorine is the element that undergoes a decrease in its oxidation state in the given reaction, as its oxidation state decreases from 0 to -1.

The reaction is as follows:

BiCl₂ + Na₂SO₄ → 2NaCl + BiSO₄

Any compound, generally ionic, contains their constituent elements with opposite oxidation states which help a compound to be formed. This implies that the oxidation states on the reactant sides includes +2 for Bi, 0 for Cl, 0 for Na, and -2 for SO₄ ions.

On the other hand, the oxidation states of the products include +1 for Na, -1 for Cl, +2 for Bi and -2 for SO₄ ions.

Now, when we have expelled out all the oxidation states of the ions involved in the chemical reaction, we can easily demonstrate which element has undergone a decrease in its oxidation number. Chlorine is reduced in this reaction as its oxidation number lowers from 0 to -1, while sodium is oxidized as its oxidation number rises from 0 to +1.

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Answer:

A

Explanation:

The reason it is distillation is due to the fact that we can use distillation to heat the ocean water. As water has a lower boiling point than the salt solution, it evaporates and the salt stays behind.

Well, animal cells are unique. Like human cells, animal cells serve as the building blocks for the Animalia kingdom along with the organisms within it. Animal cells absorb nutrients and provide energy, form a structure for the organism, and generally help an animal function correctly and move. They can replicate themselves as they contain all the hereditary material of a living organism. But overall, a animal cell is a type of cell known as a eukaryotic cell in which it lacks a actual cell wall along with a genuine, membrane-bound nucleus that consists of other cellular organelles too.

The animal cell consists of the nucleus, cell membrane, mitochondria and cytoplasm -- these 4 cell components can also be found in plant cells.

More information:

Well, “animal cells” are legitimately cells from an animal.  They are cells that belong to the same class as "animals," but each one of them may be unique and serve a distinct purpose. The absence of a cell wall and chloroplasts makes them easily distinguishable from plant cells.

animal cell is a really big range of cells, so I’m going to share a few common ones here:

(1) Stem cells are crucial cells that can develop into many types of cells in the human body. They are located in the umbilical cord, where stem cells begin to differentiate into many types of cells with various roles in the developing baby' body.

(2) Red blood cells are a unique class of cells that lack a nucleus, making them targets for the spleen's destruction and breakdown into iron and bile pigments. It has hemoglobin, which binds to oxygen to create oxyhemoglobin, which then carries oxygen to every cell in the body.

(3) White blood cells: These immune system-supporting cells work to protect the body when foreign antigens are ingested. Phagocytes and lymphocytes are the two primary subgroups of white blood cells. While lymphocytes create antibodies and interact with other immune cells, phagocytes primarily ingest foreign particles through a process known as phagocytosis.

(4) Muscle cells are, of all, what allow animals to move about. They contract and relax with the bones to let the bodily component to move. Given that a body is made up of several muscle cells, this truly covers a large spectrum of cells.

Thanks.

Answer: Animation: Burning gas makes the air inside the balloon less dense, producing an upward force or lift. 1) A hot air balloon stays on the ground (or descends) when the air inside it is too cool. ... 3) When the air is hotter still, the balloon rises because the lift force is greater than the weight.

Explanation:

Common sense

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Answer: The kinetic energy of an object depends on both its mass and velocity, with its velocity playing a much greater role. Examples of Kinetic Energy: ... A baseball thrown by a pitcher, although having a small mass, can have a large amount of kinetic energy due to its fast velocity.

Explanation:

Hope this help

Answer:Chlorine

Explanation:

This isotope is Chlorine because an atom with 17 protons will always be chlorine, just as an atom with 1 proton will always be hydrogen, for example

Answer: Sodium chloride is an ionic solid, and when it dissolves in water, its individual sodium and chloride ions are dissociated from one another. Sugar molecules, on the other hand, maintain the bonds between their constituent atoms when dissolved, and thus remain as whole molecules in the solution.

Explanation: Here's why: Salt is about 25% more dense than sugar. Therefore a teaspoon of salt weighs more than a teaspoon of sugar by almost 25%. Your dissolving test would not be accurate because you would be starting out with a larger mass of salt than sugar.

Ca(OH)2 (aq) because of elements oxygen and hydrogen

Ca(OH)2(aq)+H2SO4(aq)—→ CaSO4(s)+ 2H2O(l)

Answer:

your answer is D

Explanation:

1. White Women was not excluded from the original construction of the American political system. The correct option is (A) White Women.

Among the groups that were not excluded from the original construction of the American political system were white women, wealthy land-owning white males, and, to some extent, formerly enslaved blacks. Native Americans, on the other hand, were excluded and treated as second-class citizens.

2. Libertarianism emphasizes the idea that the government should take a "hands-off" approach in most if not all matters of economic prosperity. The correct option is (C) Libertarianism. Libertarianism is a political ideology that emphasizes the importance of individual freedom, limited government intervention, and free-market capitalism. It is an ideology that is diametrically opposed to socialism and believes that the government should not interfere in people's lives unless it is absolutely necessary.

3. The Iroquois Confederacy played a role in the development of the U.S. Constitution and the American Political System. The correct option is (B) The Iroquois Confederacy. The Iroquois Confederacy, a native North American tribe, was known for its confederate government system, which inspired the U.S. Constitution's framers.

The idea of a representative government, checks and balances, and the division of powers were all influenced by the Iroquois Confederacy.

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Answer:

A*D²/C² = 0.347

Explanation:

A*B² = 1.8*10⁻⁷----- (1)

making A subject of formula; A = 1.8 * 10⁻⁷/B² ----(2)

C* B/D = 7.2*10⁻⁴ ----(3)

making C subject of formula; C = D * 7.2*10⁻⁴/B ----(4)

substituting the values of A and C in the equation A*D²/C²

A*D²/C² = (D² * 1.8 * 10⁻⁷/B²)/(D * 7.2*10⁻⁴/B)²

A*D²/C² = (D² * 1.8 * 10⁻⁷/B²)/(D² * 5.184*10⁻⁷/B²)

A*D²/C² = D² * 1.8 * 10⁻⁷/B² * B²/D² * 5.184*10⁻⁷

A*D²/C² = 1.8 * 10⁻⁷/5.184*10⁻⁷

A*D²/C² = 0.347

The pH value of this buffer is 4.04.

A mixture of a weak acid and its conjugated base (here: benzoic acid and sodium benzoate) or a weak base and its conjugated acid is called a buffer. When calculating the pH value of a buffer, we use the Henderson-Hasselbalch equation:

\(pH = pKa+log\frac{[base]}{[acid]}\)

pKa - negative logarithm of acid's acidity constant (for benzoic acid, pKa = 4.19)

[base] - molarity of the basic component (sodium benzoate, NaOBz)

[acid] - molarity of the acidic component (benzoic acid, BzOH)

To calculate pH, we need the molarities of both sodium benzoate and benzoic acid. However, because the volume values for both components are the same, we can actually just use their number of moles (n). We can calculate the number of moles of each component using their mass (m) and molar mass (M):

n = m/M

n(NaOBz) = m(NaOBz) / M(NaOBz)

n(NaOBz) = 2.05 g / 144.11 g/mol

n(NaOBz) = 0.0142 mol

n(BzOH) = m(BzOH) / M(BzOH)

n(BzOH) = 2.47 g / 122.12 g/mol

n(NaOBz) = 0.0202 mol

Now we can plug these values into the equation:

pH = 4.19 + log(0.0142/0.0202)

pH = 4.19 + log(0.703)

pH = 4.19 - 0.15

pH = 4.04

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