Select the correct statements about an aqueous amphoteric salt solution. it?s always basic the pH depends upon the concentration of the salt it?s always acidic it?s always neutral because it is a salt it can be basic or acidic depending upon the pKa values the pH depends only on the salt species not on concentration

A chemistry class is reviewing an analysis of particles present during nuclear fusion reactions between hydrogen isotopes deuterium and tritium. the students were asked to use the model and data below to explain occurs during fusion then the fusion can be supported by the data is two smaller atoms come together to form a larger atom that is the same element

Fusion is the process in which two atom slam together to form the heavier atom called as fusion

And here according to the given data particle present before fusion in deuterium mass is two and in tritium mass is three and particle present after fusion in helium mass is four and neutron mass is one so according to the data of fusion two smaller atoms come together to form a larger atom that is the same element

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The bubbles in the bread is caused by the evolution of carbon dioxide by the action of yeast. If there are no bubbles formed inside the bread which means, the yeast did not produce the carbon dioxide needed for the bread to rise.

Fermentation is the process of conversion of sugar molecule into other substance b the action of microbes such as yeast. In cellular respiration the glucose molecule is converting to carbon dioxide and water. Where as, in fermentation, the glucose is converting to carbon dioxide and ethanol.

The balanced chemical equation of the breaking of glucose into carbon dioxide and water is written as follows:

\(\rm C_{6}H_{12}O_{6} \rightarrow 2CO_{2} + 2C_{2}H_{5}OH.\)

According to this reaction, one mole of glucose molecule gives 2 moles of carbon dioxide and 2 moles of ethanol. Hence, if the bread do not rise the bubbles, the yeast does not producing CO₂.

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The value of the equilibrium constant for the dissociation of HF is \(\rm 1.2\;\times\;10^-^3\). Thus, option D is correct.

The given balanced chemical equation is:

\(\rm 2\;HF\;\leftrightharpoons H_2\;+\;F_2\)

The equilibrium constant for the reaction is given as the ratio of the concentration of product to reactant raised to the stoichiometric coefficient.

The equilibrium constant (Keq) for the given reaction is given as:

\(Keq=\rm \dfrac{[H_2]\;[F_2]}{[HF]^2}\)

The equilibrium concentration is given as:

Substituting the values for the equilibrium constant:

\(Keq=\dfrac{[8.4\;\times\;10^-^3]\;[8.4\;\times\;10^-^3]}{[5.82\;\times\;10^-^2]} \\\\Keq=12.1\;\times\;10^-^4\\\\Keq=1.2\;\times\;10^-^3\)

The value of the equilibrium constant for the dissociation of HF is \(\rm 1.2\;\times\;10^-^3\). Thus, option D is correct.

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Answer:

C- transforemed or changed

Explanation:

matter can be changed by application of heat or cold

The balanced molecular equation for the reaction would be: \(NaCl (aq) + AgNO_3 (aq) --- > NaNO_3 (aq) + AgCl (aq)\)

A balanced molecular equation is an equation that shows the molecular formulas of the reactants and products of reactions in agreement with the law of conservation of atoms.

Aqueous sodium chloride reacts with aqueous silver nitrate to produce aqueous sodium nitrate and silver nitrate precipitates.

Formula for sodium chloride = NaCl

Formula for silver nitrate = AgNO3

Formula for silver chloride = AgCl

Formula for sodium nitrate = NaNO3

Overall balanced equation of the reaction:  \(NaCl (aq) + AgNO_3 (aq) --- > NaNO_3 (aq) + AgCl (aq)\)

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Answer:

V₂ = 112.14 mL

Explanation:

Given data:

Initial volume = 500 mL

Initial pressure = 270 mmHg (270/760 =0.355 atm)

Initial temperature = 55 °C (55 +273 = 328 K)

Final temperature = 100°C (100+273 = 373 K)

Final volume = ?

Final pressure = 1.8 atm

Formula:  

P₁V₁/T₁ = P₂V₂/T₂  

P₁ = Initial pressure

V₁ = Initial volume

T₁ = Initial temperature

P₂ = Final pressure

V₂ = Final volume

T₂ = Final temperature

Solution:

V₂ = P₁V₁ T₂/ T₁ P₂  

V₂ = 0.355 atm × 500mL × 373 K / 328 K × 1.8 atm

V₂ = 66207.5 atm .mL. K /  590.4 K.atm

V₂ = 112.14 mL

Thin layer chromatography (TLC) is an affinity derived approach that works to separate compounds in a mixture. TLC is deeply versatile separation method used for both qualitative and quantitative sample analysis.

In general, Thin layer chromatography is performed by using a thin, uniform layer of silica gel or alumina coated onto a piece of glass, metal or rigid plastic. These silica gel is present in stationary phase. There are three most important industrial applications that thin layer chromatography has are clinical, pharmaceutical, and food testing approaches. One of the most common specific types of clinical tests performed with TLC is for the presence of drugs of abuse.

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Answer: True

Explanation:

The decay constant (λ) can be calculated using the half-life (t½) of a radioactive substance using the following formula:

λ = ln(2) / t½

Given that the half-life of carbon-10 is 19.3 seconds, we can calculate the decay constant as follows:

λ = ln(2) / 19.3

Using a calculator, we find that λ is approximately 0.0359/s.

Therefore, the correct answer is:

C. 0.0359/s

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Answer: A solid form of matter in which there is long-range repeating order is called crystalline.

Explanation:

A solid is crystalline if it has long-range order. Once the positions of an atom and its neighbors are known at one point, the place of each atom is known precisely throughout the crystal.

Answer:

i don't know

sorry i would help but  i don't know

Explanation:

1.25 x 1023 atoms of magnesium contains 0.28. moles of magnesium.

A mole of any element contains Avogadro's number of that element's atoms. To find the number of moles of magnesium in 1.25 x 1023 atoms of magnesium, simply divide by Avogadro's number:

1.25 x

\( {10}^{23} \)

magnesium atoms / 6.022 x

\( {10}^{23} \)

atoms/mol = 0.208 moles magnesium

As a result, 1.25 x

\( {10}^{23} \)

atoms of magnesium contain 0.208 moles of magnesium.

The number of particles (atoms, molecules, and ions) in one mole of a substance is represented by Avogadro's number, which is a fundamental constant in chemistry. It has a value of about 6.022 x

\( {10}^{23} \)

particles per mole. The number was named after Italian scientist Amedeo Avogadro, who first proposed the concept in the early 19th century as a way to explain the relationship between the amount of a substance and its constituent particles.

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The net ionic equation is written as H^+(aq) + OH^-(aq) -------> H2O(l)

The term net ionic equation refers to the equation that shows the ions that underwent a change in the reaction. We have to note that the reaction species here must be ionic species which are able to dissociate into ions in solutions.

Now the first step is to put down the molecular equation. The molecular equation shows the reaction of the compounds as follows;

HCI (aq) + NaOH (ag)-> NaCI (aq) +H2O(l)

Next, we put own the complete ionic reaction equation as follows;

H^+(aq) + Cl^-(aq) + Na^+(aq) + OH^-(aq) -------> Na^+(aq) + + Cl^-(aq) + H2O(l)

Next we have the net ionic equation;

H^+(aq) + OH^-(aq) -------> H2O(l)

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The number of tablespoons of milk needed for 28 pancakes is determined as 12 tablespoons.

option C is the correct answer.

The number of the tablespoons of milk that would be needed is calculated by applying simple proportion method.

3 tablespoons of milk for 7 pancakes;

3 -----------> 7

? tablespoons of milk for 28 pancakes;

? --------------------> 28

Combine the two equations and solve for the number of tablespoons needed as follows;

? = ( 3 x 28 ) / 7

? = 12

Thus, The number of tablespoons of milk needed for 28 pancakes is determined by applying simple proportion.

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Answer:

chemical reactions which proceed with the release of heat energy are called exothermic reactions

Molarity= No of moles of solute * 1000 / vol solution in ml

No of moles= Given mass / Molar mass

Given Mass of solute (H2O2)= 10g

Molar mass of H2O2=34gmol^-1

No of moles= 10/34= 0.294 moles

Volume of solution=50ml

Molarity =   0.294*1000 / 50

Molarity = 5.8M

The product of an acid-base reaction that is most likely to be an ionic compound is a salt. Option D).

In an acid-base reaction, the product that is most likely to be an ionic compound is a salt. A salt is formed when an acid reacts with a base, resulting in the transfer of ions between the two reactants. Acids typically release hydrogen ions (H+) when dissolved in water, while bases release hydroxide ions (OH-). When these ions combine, they form water (H2O), which is a neutral molecule.

However, in addition to water, the reaction between an acid and a base also produces a salt. A salt is an ionic compound composed of positive and negative ions. The positive ion usually comes from the base, while the negative ion comes from the acid. The combination of these ions results in the formation of an ionic compound, which is commonly referred to as a salt.

Therefore, the product of an acid-base reaction that is most likely to be an ionic compound is a salt. Hence option D) is correct.

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2AgBr(s) ⇒ 2Ag(s) + Br₂(l) ΔH = -220kJ ⇒ for 2 mol Ag

mol Ag = 7.08 : 108 g/mol = 0.065

the enthalpy change = 0.065/2 x -220 kJ = -7.15 kJ

AL are produced when 5 ×103 coulombs pass through the cell: 3. 0.243 grams

1 mol e− carries a charge of 1 Faraday

and 1 Faraday = 96485 Coulombs.

Then

No of moles of  e− in the electrolysis:

2.6 x 10^3 C / 96485 C. mol^-1

= 0.0269 moles of electrons

From the reduction equation, we know that, 3 moles of e- are needed to reduce 1 mol of Al3+ to Al metal.

Therefor, the mole of Al to be deposited (Cathode)  are

0.02695 / 3 = 0.00898 mol of Al

Molar mass of Al = 27 gram/mol

Mass of Al produced = 0.00898 mol * 27 gram/ mol = 0.243 grams

Electrolysis may be used to split a substance into its authentic additives/factors and it become thru this manner that some of factors have been discovered and are nevertheless produced in ultra-modern enterprise.

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Answer:

For the reaction

2

H

2

+

O

2

→

2

H

2

O

, how many moles of water can be produced from 6.0 mol of oxygen?

Chemistry Mole Ratios

1 Answer

Stefan V.

Dec 5, 2015

12 moles H

2

O

Explanation:

Your tools of choice for stoichiometry problems will always be the mole ratios that exist between the chemical species that take part in the reaction.

As you know, the stoichiometric coefficients attributed to each compound in the balanced chemical equation can be thought of as moles of reactants needed or moles of products formed in the reaction.

In your case, the balanced chemical equation for this synthesis reaction looks like this

2

H

2(g]

+

O

2(g]

→

2

H

2

O

(l]]

Notice that the reaction requires

2

moles of hydrogen gas and

1

mole of oxygen gas to produce

2

moles of water.

This tells you that the reaction produces twice as many moles of water as you have moles of oxygen gas that take part in the reaction.

You know that your reaction uses

6.0

moles of oxygen. Assuming that hydrogen gas is not a limiting reagent, you can say that the reaction will produce

6.0

moles O

2

⋅

2

moles H

2

O

1

moles O

2

=

12 moles H

2

O

The temperature at which 2.10 moles of N₂ gas would have a pressure of 1.25 atm in a 25.0 L tank is approximately 181.25 Kelvin.

To find the temperature for 2.10 moles of N₂ gas with a pressure of 1.25 atm in a 25.0 L tank, we can use the Ideal Gas Law equation, which is:
PV = nRT

where P represents pressure (in atm), V is the volume (in L), n is the number of moles, R is the ideal gas constant (0.0821 L atm/mol K), and T is the temperature (in Kelvin).

We are given the values for P (1.25 atm), V (25.0 L), and n (2.10 moles). We can rearrange the equation to solve for T:
T = PV / (nR)

Plugging in the values, we get:
T = (1.25 atm)(25.0 L) / [(2.10 moles)(0.0821 L atm/mol K)]
T = 31.25 / 0.17241
T ≈ 181.25 K

Therefore, the temperature at which 2.10 moles of N₂ gas would have a pressure of 1.25 atm in a 25.0 L tank is approximately 181.25 Kelvin.

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Answer: In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.

(hope this helps you ^^)

Answer:

An ice cube melting is a physical change because melting doesn't change the composition of the element. Paper burning is a chemical change because combustion occurs. Bubbles forming in a soda does involve chemical changes. Hard-boiling an egg is a chemical change because the egg's composition changed.

The correct coefficient for the previous redox reaction  X₁ X Ω· H₂106 + Cr-10 + Cr³+ is 6.

In the given redox reaction, the coefficient in front of Cr³+ is 6. This means that 6 moles of Cr³+ ions are involved in the reaction. The coefficient indicates the relative amount of each species involved in the reaction. In this case, the reaction involves the transfer of electrons between species, with Cr³+ being reduced to Cr²+.

By assigning a coefficient of 6 to Cr³+, it ensures that the number of electrons transferred and balanced on both sides of the reaction equation.

The coefficient of 6 indicates that for every 6 moles of Cr³+ ions participating in the reaction, there must be a corresponding number of moles for the other species involved.

It is important to balance the coefficients in a redox reaction to ensure that the reaction obeys the law of conservation of mass and charge.

The balanced coefficients help in determining the stoichiometry of the reaction, providing a clear understanding of the relative amounts of reactants and products involved.

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TheThe mass percent of HOCH2CH2OH is 6.85%

Mass of solute (ethylene glycol) = 3.2 g

Mass of solvent (water) = 43.5 g

Mass of solution = Mass of solute + Mass of solvent = 3.2 + 43.5 = 46.7 g.

Mass%= mass of solute×100/mass of solution

Mass%=3.2×100/43.5 = 6.85%

What is the relationship between solute and solvent?

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James Chadwick discovered the neutron, which was the last of the subatomic particles to be characterized.

James Chadwick bombarded alpha particles on the beryllium surface using radioactive decay o polonium as a source. He discovered penetrating particles with no charge. These particles were fast-moving with no positive or negative charge.

These radiations were made incident on paraffin wax. This experiment was very similar to Rutherford's experiment.

The mass of the neutron was almost equal to the mass of the proton but its penetrating power was higher than a proton. It can penetrate several inches of lead.

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Answer:

2.38 mol of Al

Explanation:

To find the number of moles in a substance, you simply divide by the atomic mass. In this case, the conversion table would look as follows:

\(\frac{64.1 g}{1}\) * \(\frac{1 mol}{26.98 g}\)

The gram units cancel, and you are left with the answer of about 2.38 moles of Aluminum.

Answer:

When solid oxalic acid dissolved in water, it dissociates ,  H+ - ions is formed, so acidic properties can be observed.

Explanation:

When solid oxalic acid dissolved in water, it dissociates ,  H+ - ions is formed, so acidic properties can be observed.

C2H2O4 ----> \(H^{+}\) + \(C_{2}HO_{4}^{-}\)

\(C_{2}HO_{4}^{-} ----> H^{+} + C_{2}O_{4}^{2-}\)

When oxalic acid is solid, there are no free moving H+ - ions , so acidic properties can not be observed.

Answer: 10 mg

Explanation:

First, take 17,190 divided by 5730 = 3 half-life

We know that after each half-life, the sample will decrease by half

80 mg = 0 half-life

40 mg = 1 half- life

20 mg = 2 half-life

10 mg = 3 half-life