the pka of acetic acid is 4.80. a buffer solution was made using an unspecified amount of acetic acid and 0.2 moles of nac2h3o2 in enough water to make 1.54 liters of solution

True. The Genuine Progress Indicator (GPI) incorporates adjustments to GDP in order to provide a more comprehensive measure of societal progress rather than focusing solely on economic activity.

The statement is true. The GPI is an alternative economic indicator that takes into account various factors beyond traditional economic measures like GDP. It aims to provide a more holistic view of societal progress by considering social, environmental, and economic factors.

Unlike GDP, which primarily measures the monetary value of goods and services produced within a country, the GPI adjusts for certain aspects that affect well-being but are not adequately captured by GDP. These adjustments include factors such as income inequality, environmental degradation, the value of unpaid household work, and the depletion of natural resources.

By incorporating these adjustments, the GPI offers a more nuanced understanding of the overall well-being and sustainability of a society. It recognizes that economic growth alone does not necessarily translate into improved quality of life or societal progress. The GPI provides policymakers and researchers with a tool to assess and compare the overall welfare and progress of different regions or countries beyond just economic indicators like GDP.

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In 1854, Cyrus West Field conceived the idea of the telegraph cable and secured a charter to lay a well-insulated line across the floor of the Atlantic Ocean. Obtaining the aid of British and American naval ships, he made four unsuccessful attempts, beginning in 1857.

The reaction of 1-H-imidazole with water can be represented as follows:

C3H4N2 + H2O ⇌ C3H4N2H+ + OH-

The base protonation constant Kb for this reaction is given as 9.0 × 10^-8.

The equilibrium constant expression for this reaction is:

Kb = [C3H4N2H+][OH-] / [C3H4N2][H2O]

Assuming that the concentration of water remains essentially constant (55.5 M), we can simplify the expression to:

Kb = [C3H4N2H+][OH-] / [C3H4N2]

Since the solution is dilute, we can assume that the dissociation of water is negligible, and the concentration of OH- is equal to Kb/[C3H4N2H+].

Substituting this into the above expression, we get:

Kb = [C3H4N2H+]^2 * Kb / [C3H4N2]

Solving for [C3H4N2H+], we get:

[C3H4N2H+] = sqrt(Kb * [C3H4N2]) = sqrt(9.0 × 10^-8 * 1.1) = 2.81 × 10^-5 M

The pH of the solution can be calculated as follows:

pH = -log[H+]

Since [H+] = [C3H4N2H+], we get:

pH = -log(2.81 × 10^-5) = 4.55

Therefore, the pH of a 1.1 M solution of 1-H-imidazole at 25 °C is 4.6 (rounded to 1 decimal place).

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\(CH_3CH_2OH\) is a polar compound and has hydrogen bonding. It has a higher boiling point. It will have the lowest vapor pressure among the three compounds.

Vapor pressure is the pressure produced by the vapors of a liquid in a sealed container when the liquid is heated. It is a property of a liquid that describes the tendency of a liquid to evaporate. It is measured in units of pressure, typically in mmHg or torr. The higher the vapor pressure, the more volatile a compound is. So, the decreasing order of vapor pressure for the given compounds is: \(CH_3CH_3 > CH_3CH_2F > CH_3CH_2OH\)

Here, \(CH_3CH_3\) is a non-polar compound while \(CH_3CH_2F\) and \(CH_3CH_2OH\) are polar compounds. The polar compound has hydrogen bonding, which increases the intermolecular forces between molecules. As a result, the polar compound will have a lower vapor pressure than the non-polar compound.

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Answer:  Element Tellurium (Te), Group 16, Atomic Number 52, p-block, Mass 127.60. ... defined as being the charge that an atom would have if all bonds were ionic.

What ion does tellurium form?

Te+4

Tellurium, ion (Te4+) | Te+4 - PubChem.

Explanation:  Tellurium is a chemical element with the symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid.

Tellurium

Tellurium Element - Visual Elements Periodic Table

Discovery date 1783  

Discovered by Franz-Joseph Müller von Reichenstein  

Origin of the name The name is derived from the Latin 'tellus', meaning Earth.  

Allotropes  

Te

Tellurium

52127.60  

Fact box

Group 16  Melting point 449.51°C, 841.12°F, 722.66 K  

Period 5  Boiling point 988°C, 1810°F, 1261 K  

Block p  Density (g cm−3) 6.232  

Atomic number 52  Relative atomic mass 127.60  

State at 20°C Solid  Key isotopes 130Te  

Electron configuration [Kr] 4d105s25p4  CAS number 13494-80-9  

ChemSpider ID 4885717 ChemSpider is a free chemical structure database

Answer:

1. 2.1 moles of Mg

2. 0.72 mole of Mg(OH)2

Explanation:

1. We'll begin by writing the balanced equation for the reaction. This is given below:

3Mg + 2AlBr3 —> 3MgBr2 + 2Al

From the balanced equation above, 3 moles of Mg reacted to produce 2 moles of Al.

Therefore, Xmol of Mg will react to produce 1.4 moles of Al i.e

Xmol of Mg = (3 x 1.4)/2

Xmol of Mg = 2.1 moles.

Therefore, 2.1 moles of Mg is required to 1.4 moles of Al.

2. We'll begin by calculating the number of mole in 26g of water, H2O.

This is illustrated below:

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O = 26g

Number of mole of H2O =?

Mole = Mass /Molar Mass

Number of mole of H2O = 26/18

Number of mole of H2O = 1.44 moles

Next, we shall write the balanced equation for the reaction. This is given below:

2HNO3 + Mg(OH)2 —> Mg(NO3)2 + 2H2O

Finally, we can obtain the number of mole of Mg(OH)2 used in the reaction as follow:

From the balanced equation above,

1 mole of Mg(OH)2 reacted to produce 2 mole of H2O.

Therefore, Xmol of Mg(OH)2 will react to produce 1.44 moles of H2O i.e

Xmol of Mg(OH)2 = (1 x 1.44)/2

Xmol of Mg(OH)2 = 0.72 mole.

Therefore, 0.72 mole of Mg(OH)2 was used in the reaction.

To determine the exact value of pK2 in this case, we can use the relationship between pH and pK, which states that the pH of a solution is equal to the pK of the acid with the lowest concentration when the acid and its conjugate base are in equilibrium.

Here, we know that the pH of the solution dropped from 8.00 to 3.20 after the addition of HCl. We can assume that the second group is now in the acid form since we know that the first ionizable group has a pK of 3.8, and the second group (pK2) is between 7 and 10, we can assume that the second group is now in the acid form.

We can use the relationship between pH and pK to calculate the exact value of pK2:

pH = pK2 = pKw / [H+] = 14.00 - log([H+])

3.20 = 14.00 - log([H+])

Solving for [H+], we find that [H+] = 1.0 x 10^-3.2

Now we can find the value of pK2 as:

pK2 = 14.00 - log(1.0 x 10^-3.2) = 14.00 - (-3.2) = 14.00 + 3.2 = 17.2

Therefore, the exact value of pK2 is 17.2.

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Answer:h

Explanation:

Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Answer:

Density, \(d=2.09\ g/cm^3\)

Explanation:

Given that,

Mass of a flask is 450 g

Volume of benzene added to the flask is 145 mL or 145 cm³

The weight of the flask and benzene is found to be 754 g.

We need to find the density of the benzene.

Weight of benzene added = total weight of flask and benzene-mass of flask

m = 754 g - 450 g

m = 304 g

Density = mass/volume

So,

\(d=\dfrac{304\ g}{145\ cm^3}\\\\d=2.09\ g/cm^3\)

So, the density of the benzene is \(2.09\ g/cm^3\).

Answer:

Explanation:

The conversion of sulphur to sulfuric acid, though it goes through several steps, is:

2 S + 3 O2 + 2 H2O → 2 H2SO4

OK, so the equation says for every 2 moles of S you will get two moles of sulfuric acid. With a little simple math, then, the ratio of S to H2SO4 is 2:2 which is the same as 1:1.

While not correct by convention, you can write the above equation as

S + 3/2 O2 + H2O → H2SO4

And then the relationship between S and H2SO4 is more clear.

A. Absorption. Both processes are relatod to the way drugs are absorbed into the system.

Answer:

C

Explanation:

No reaction because not enough moles of silver are present for the reaction to occur.

The molecular formula C5H8 indicates that there are five carbons and eight hydrogens. This means that two possible structures for a compound that produces an IR signal at 3300 cm-1 are cyclopentane and cyclopentene.

Cyclopentane has a ring structure with five carbon atoms and eight hydrogens: C5H8. This compound is saturated, meaning that it contains no double or triple bonds.

Cyclopentene has a ring structure with five carbon atoms and eight hydrogens: C5H8. This compound is unsaturated, meaning that it contains one double bond.

Both cyclopentane and cyclopentene have the molecular formula C5H8 and produce an IR signal at 3300 cm-1.

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i cant understand your question define briefly

There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

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In the IR spectrum, the appearance of a broad peak around 3200-3600 cm^-1 (O-H stretch) and a strong peak around 500-600 \(cm^{-1\) (C-Br stretch) would indicate the conversion of cyclohexene to trans-bromocyclohexanol.

Infrared (IR) spectroscopy can provide information about the functional groups present in a molecule. In the case of the conversion of cyclohexene to trans-bromocyclohexanol, there are certain characteristic IR signals that can indicate the formation of the desired product.

1. Hydroxyl group (OH): The presence of the hydroxyl group in trans-bromocyclohexanol can be confirmed by the appearance of a broad and strong peak in the IR spectrum between 3200-3600 \(cm^{-1\) indicating the stretching vibration of the O-H bond.

2. Bromine (Br): The introduction of a bromine atom in trans-bromocyclohexanol will result in the appearance of a sharp and strong peak in the IR spectrum around 500-600 \(cm^{-1\), representing the stretching vibration of the C-Br bond.

3. Alkene group (C=C): In cyclohexene, there is a carbon-carbon double bond (C=C). After conversion, the disappearance of the C=C stretching vibration peak around 1600-1680 cm^-1 in the IR spectrum would suggest the successful transformation into trans-bromocyclohexanol.

These characteristic peaks and changes in the IR spectrum would indicate the presence of hydroxyl and bromine groups, as well as the absence of the alkene group, providing evidence for the conversion of cyclohexene into trans-bromocyclohexanol.

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The number of atoms of v are preset in each unit cell is 2.

This unit cell uses nine  atoms, eight of which are corner atoms forming the  cell and one  further in the center of the  cell. The corners contribute only one net  atom and the center atom contributes another for a aggregate of two  atoms.

In a BCC ( body centered cubic) unit cell, there's one atom fully contained within the unit cell at the chassis  point in the center, and the chassis  spots at each of the eight corners are also  enthralled, but each of those is participated between eight neighboring unit cells.

So the total number of  atoms for each unit cell is

= > 18/8

= > 2

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Magnets attract iron due to the influence of their magnetic field upon the iron. Before a piece of iron enters the magnet, the polarization of the irons atoms is random. When exposed to the magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well. This, in turn, creates an attraction between the two magnetized objects. This is why a piece of iron that is exposed to a magnet becomes magnetic for some time afterward.

Answer:

Combustion of methane (hydrocarbons)

Photosynthesis.

Synthesis of sulfuric acid.

Equilibrium of carbonic acid and carbon dioxide gas.

Biological formation of calcium carbonate.

Rusting of iron.

Production of hydrogen from the action of acid on metal.

Oxidation of alcohol.

Explanation:

how this helps if do mark brainllest pls!!! :)

The statement " nutrition is the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures" is true.

Nutrition is indeed the acquisition of chemical substances by organisms for use as an energy source or as building blocks of cellular structures. Organisms require various nutrients, including carbohydrates, proteins, fats, vitamins, minerals, and water, to carry out their metabolic processes, maintain growth and development, and support overall health and well-being.

These chemical substances obtained through nutrition are utilized by organisms to provide energy for cellular processes, such as respiration, synthesis of biomolecules, and movement. They also serve as building blocks for the construction and repair of cellular structures, including proteins, nucleic acids, lipids, and carbohydrates.

Nutrition is a fundamental process that ensures the availability of essential nutrients for organisms to carry out their life functions effectively. Different organisms have varied nutritional requirements depending on their specific metabolic needs, lifestyles, and physiological characteristics.

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Answer:

1. 8.28

Explanation:

I'm not sure but I hope it's help

Answer:

b,d,f

Explanation:your welcome give brainilest

Answer:

b,d,f

Explanation:

Answer:1. One is warm, the other cold

2. the cold one is smaller

Explanation: V/T is constant

if temperature decreases, volume decreases and vice versa

According to the concept of thermal energy, the balloon kept in refrigerator  has less volume while that is heated has more volume.

Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.

These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.

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Answer:

Lemon juice baking soda and vinegar

Explanation:

The volume of a 0.126 M calcium hydroxide solution required to neutralize 21.3 mL of a 0.170 M hydrochloric acid solution.

Moles of HCl = (Molarity of HCl) × (Volume of HCl solution in liters)Moles of HCl = 0.170 M × (21.3/1000) L.

Moles of HCl = 0.003621 moles . Using the stoichiometry ratio, we can now calculate the amount of calcium hydroxide needed to neutralize the hydrochloric acid:

2 moles of HCl = 1 mole of Ca(OH)20.003621 moles of HCl = (1/2) × 0.003621 moles of Ca(OH)2Moles of Ca(OH)2 = 0.0018105 moles of Ca(OH)2.

Now, to calculate the volume of 0.126 M Ca ( OH ) 2 solution required:0.126 M Ca(OH)2 = 0.126 moles of Ca(OH)2 in 1 Liter of solution 0.0018105 moles of Ca (OH )2 = (0.126/1) Liters of Ca(OH)2 solution .

Liters of Ca(OH)2 solution = 0.0018105 / 0.126 Liters of Ca (OH) 2 solution = 0.01437 Liters (or 14.37 mL)

Therefore, to neutralize 21.3 mL of 0.170 M HCl solution, we require 14.37 mL of 0.126 M Ca (OH) 2 solution.

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Answer:

Explanation:

The first thing that you need to do here is to calculate the theoretical yield of the reaction, i.e. what you get if the reaction has a

100

%

yield.

The balanced chemical equation

N

2

(

g

)

+

3

H

2

(

g

)

→

2

NH

3

(

g

)

tells you that every

1

mole of nitrogen gas that takes part in the reaction will consume

3

moles of hydrogen gas and produce

1

mole of ammonia.

In your case, you know that

1

mole of nitrogen gas reacts with

1

mole of hydrogen gas. Since you don't have enough hydrogen gas to ensure that all the moles of nitrogen gas can react

what you need

3 moles H (sub 2)

>

what you have

1 mole H (sub2)

you can say that hydrogen gas will act as a limiting reagent, i.e. it will be completely consumed before all the moles of nitrogen gas will get the chance to take part in the reaction.

So, the reaction will consume

1

mole of hydrogen gas and produce

1

mole H

2

⋅

2 moles NH

3

3

moles H

2

=

0.667 moles NH

3

at

100

%

yield. This represents the reaction's theoretical yield.

Now, you know that the reaction produced

0.50

moles of ammonia. This represents the reaction's actual yield.

In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every

100

moles of ammonia that could theoretically be produced.

You know that

0.667

moles will produce

0.50

moles, so you can say that

100

moles NH

3

.

in theory

⋅

0.50 moles NH

3

.

actual

0.667

moles NH

3

.

in theory

=

75 moles NH

3

.

actual

Therefore, you can say that the reaction has a percent yield equal to

% yield = 75%

−−−−−−−−−−−−−

or 75 moles NH sub3

I'll leave the answer rounded to two sig figs.