For each of the following categories of compounds, indicate the type of liquid chromatography that could be used to separate analytes in that category. (Drag the appropriate chromatography label to the blank next to the category. Only one label applies to each category, but a label may be used more than once).
Seperation Mode Analyte Category
Fm>2000,soluble in octane,size10 nm
Fm>2000, soluble in butanol, size 100 nm
Fm>2000, soluble in water,nonionic,size 10 nm
Fm<2000, soluble in in ethanol
Fm<2000 , soluble in water, ion-paired
Fm<2000, soluble in water, ionic
Choices:
ion -exchange
Bonded-reverse phase
Adsorption
Bonded normal phase
Molecular exculsion

Answer: A School (I made this 2 years ago for a project, I didn't feel like making a new analogy)

1. Nucleus: Principle because they control the school.

2. Cytoplasm:  Water pipes because they constantly move and have water in it.

3. Cell Membrane:  The doors to the school because they let things in and out.

4. Lysosome:  The trash and the janitors because they dispose of everything.

5. Mitocondria:  The power lines because they provide/create the energy.

6. Ribosome:  The teachers because they are assembled by the “principle” and give the proteins which is the knowledge.

7. Vacuoles: The closets because they store the materials.

8. Endoplasmic Reticulum:  The hallways because it allows to move from one place to another.

9. Golgi Bodies: The conference room because they make the AKS perfect and send it to the teachers.

True : Because of the difference in molar masses, any particle of gas a will be moving slower than any particle of gas b at the same temperature.

The molar mass of a chemical compound is determined in chemistry by dividing the mass of a sample of that compound by the quantity of that compound, which is the number of moles in that sample, measured in moles. A substance's molar mass is a bulk attribute rather than a molecular one. The compound's molar mass is an average over multiple samples, each of which will likely have a different mass because of the existence of isotopes. The molar mass is most frequently calculated from the standard atomic weights, making it a terrestrial average and a function of the relative abundance of the constituent atoms' isotopes on Earth. For converting between the mass of a material and the amount of a substance for bulk amounts, use the molar mass.

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P-S bond is the least polar.

Polarity is defined as the separation of charge between two atoms participating in a bond, giving rise to a dipole moment and thus a difference in electronegativity(tendency to pull electrons towards itself).

Different atoms have different values of electronegativity

The electronegativity values of the given elements are:

C= 2.55

F=3.98

Na=0.93

Cl=3.16

Si=1.9

P=2.19

S=2.58

Electronegativity difference between:

A) C,F = 3.98-2.55 =1.43

B) Na,Cl = 3.16-0.93=2.23

C) Si,Cl = 3.16-1.9=1.26

D) P,S= 2.58-2.19=0.39

E) Na,S= 2.58-0.93= 1.65

The electronegativity difference between P and S is the least, so P-S bond will be least polar.

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Answer:

7 sublimation

8 freezing

9 melting

10 condensation

11 evaporation

Explanation:

The false statement from the above is that: Temporary charge imbalances in the molecules lead to London dispersion forces.

Generally, the factors which affects the London dispersion forces a dispersion force are as follows:

However, London dispersion forces simply refers to a sort of temporary attractive force formed when electrons in two adjacent atoms occupy positions that make the atoms form dipoles.

So therefore, temporary charge imbalances in the molecules lead to London dispersion forces is a false statement

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The vapor-pressure lowering, AP, of an aqueous solution is 2.44Torr.

Mole = \(\frac{weight}{molecular weight}\)

In a 1.80m (molal) solution, 1 kilogram of the solvent contains 1.80 moles of the solute (which is water in this case).

Water's molar mass is equal to 2(atomic mass of H) + [2(1)+16] (atomic mass of O).

=18g/mol

The mole of water in 1 kilogram (equivalent to 1000 grams)::

\(n_{H_{2} O}\)= \(\frac{1000}{18g/mol}\) = 55.56mol

The solute's mole fraction in the 1.80 m solution is as follows::

\(x_{solute}\) = \(\frac{n_{solute} }{n_{H_{2}O }}\)

   ⇒\(x_{solute} =\) \(\frac{1.80}{55.56}\) = 0.032

a. Sucrose is a non-electrolyte, i.e., it does not undergo dissociation in the aqueous solution.

As a result, the Van't Hoff factor for sucrose is = i = 1

The lowering in vapor pressure of the solution, which is 1.80m in sucrose:

=\(ix_{solute}p^{0}\)

=(1)(0.032)(17.54)Torr

=(0.56)Torr

b. Aluminum chloride dissociate in water as follows:

\(AlCl_{3}\) →\(Al^{3+}+ 3Cl^{-}\)

As a result, an aqueous solution containing one aluminum chloride particle yields four more particles.

Thus, i=4

The lowering in vapor pressure is thus:

=\(ix_{solute}p^{0}\)

=(4)(0.032)(17.54)Torr

=(2.24)Torr

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We have that the  two significant redox processes  is given as

reduction reaction

From the question we are told

identify two significant redox processes in biochemical systems​

Generally the the are two name that comes to mind when redox reaction is mentioned

And these makes two significant Redox processes in biochemical systems​

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Answer:

which property is least helpful in identifying a sample of matter is (B) VOLUME

Explanation:

volume depend on the amount of substance present and are not useful in the identification of a sample of matter. volume is an extensive property so it is not useful identifying the sample of matter.

Answer: The pH of solution is 10.

The pOH of the solution is 4.

Explanation:

pH is the negative logarithm of concentration of hydrogen ion.

As given concentration of acidic solution is \(1.00 \times 10^{-10} M\). Therefore, pH of the solution is calculated as follows.

\(pH = -log [H^{+}]\\= -log (1.00 \times 10^{-10})\\= 10\)

The relation between pH and pOH is as follows.

pH + pOH = 14

pOH = 14 - pH

= 14 - 10

= 4

Thus, we an conclude that pH of solution is 10 and pOH of the solution is 4.

Statements about fossils are true -

The remains or traces of ancient living organisms that have been preserved by natural processes, known as Fossils. These are of many types of parts and some are whole preserved organisms, some are impressions, while others are mold.

Thus, Statements about fossils are true -

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Answer:

No

Explanation:

Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture.

Considering the Hess's Law, the enthalpy change for the reaction is 221.8 kJ/mol.

Hess's Law indicates that the enthalpy change in a chemical reaction will be the same whether it occurs in a single stage or in several stages. That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

In this case you want to calculate the enthalpy change of:

C₂H₄ (g) + 6 F₂ (g) → 2 CF₄ (g) + 4 HF (g)

which occurs in three stages.

You know the following reactions, with their corresponding enthalpies:

Equation 1: H₂ (g) + F₂ (g) → 2 HF (g)     ∆H° = -79.2 kJ/mol

Equation 2: C (s) + 2 F₂ (g) → CF₄ (g)     ∆H° = 141.3 kJ/mol

Equation 3: 2 C(s) + 2 H₂ (g) → C₂H₄ (g)     ∆H° = -97.6 kJ/mol

Because of the way formation reactions are defined, any chemical reaction can be written as a combination of formation reactions, some going forward and some going back.

First, to obtain the enthalpy of the desired chemical reaction you need one mole of C₂H₄ (g) on reactant side and it is present in first equation. Since this equation has one mole of C₂H₄ (g) on the product side, it is necessary to locate it on the reactant side (invert it).

When an equation is inverted, the sign of ΔH° also changes.

Now, you need 2 moles of CF₄ (g) on the product side. The second equation has 1 mole of CF₄ (g) on the product side, so it is necessary to multiply it by 2 to obtain 2 moles of CF₄ (g).

Since enthalpy is an extensive property, that is, it depends on the amount of matter present, since the equation is multiply by 2, the variation of enthalpy also.

Finally, you need 4 moles of  HF (g) on the product side. The first equation has 2 moles of  HF (g) on the product side, so it is necessary to multiply it by 2 to obtain 4 moles of the compound.

Since the equation is multiply by 2, the variation of enthalpy also is multiplied by 2.

In summary, you know that three equations with their corresponding enthalpies are:

Equation 1: 2 H₂ (g) + 2 F₂ (g) → 4 HF (g)     ∆H° = -158.4 kJ/mol

Equation 2: 2 C (s) + 4 F₂ (g) → 2 CF₄ (g)     ∆H° = 282.6 kJ/mol

Equation 3: C₂H₄ (g) → 2 C(s) + 2 H₂ (g)     ∆H° = 97.6 kJ/mol

Adding or canceling the reactants and products as appropriate, and adding the enthalpies algebraically, you obtain:

C₂H₄ (g) + 6 F₂ (g) → 2 CF₄ (g) + 4 HF (g)     ΔH°= 221.8 kJ/mol

Finally, the enthalpy change for the reaction is 221.8 kJ/mol.

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Now, you must figure out how much heat is needed to increase the temperature of 1 kg of foam by 2 K . In this case, you know that you need 1200 J to increase its temperature by 1 K , so you can say that another 1200 J will increase its temperature by 1 K again.

A colored substance that is entirely or almost entirely insoluble in water is called a pigment and organic molecule.

Thus, Contrarily, dyes are usually soluble, at least initially, during their use. In general, pigments are frequently inorganic substances while dyes are frequently organic molecules.

The global market for inorganic, organic, and specialty pigments reached around 7.4 million tons in 2006.

In a report published in April 2018 by Bloomberg Businessweek, the pigment sector was predicted to be worth $30 billion globally.

Titanium dioxide, which is used to increase the white brightness of numerous items, is valued at $13.2 billion annually, while Ferrari red is worth $300 million.

Thus, A colored substance that is entirely or almost entirely insoluble in water is called a pigment.

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Detergent enzymes are better because they help limit phosphate pollutants in the environment. Option 3.

Phosphates are a common ingredient in traditional laundry detergents, but they can have harmful effects on the environment.

When phosphate-containing detergents are used, the phosphates can end up in waterways and cause excessive algae growth, leading to decreased oxygen levels in the water and harm to aquatic life.

Enzyme-based detergents can be a more environmentally friendly option as they do not contain phosphates, reducing the amount of phosphate pollution released into the environment.

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55.03 moles of KCI are produced when 6743 grams of \(KClO_{3}\) decomposes

To determine the number of moles of KCl produced when 6743 grams of \(KClO_{3}\) decomposes, we need to use the concept of molar mass and the balanced chemical equation.

First, let's calculate the molar mass of \(KClO_{3}\)

The molar mass of potassium (K) is approximately 39.10 g/mol.

The molar mass of chlorine (Cl) is approximately 35.45 g/mol.

The molar mass of oxygen (O) is approximately 16.00 g/mol.

So, the molar mass of \(KClO_{3}\) is:

(39.10 g/mol) + (35.45 g/mol) + (3 * 16.00 g/mol) = 122.55 g/mol.

Now, we need to calculate the number of moles of \(KClO_{3}\):

Number of moles = Mass / Molar mass

Number of moles = 6743 g / 122.55 g/mol = 55.03 mol.

According to the balanced chemical equation:

2\(KClO_{3}\) -> 2 KCl + 3 O2,

we can see that for every 2 moles of \(KClO_{3}\), we obtain 2 moles of KCl.

Therefore, the number of moles of KCl produced will be equal to the number of moles of \(KClO_{3}\) since the ratio is 1:1. Thus, 55.03 moles of KCl will be produced.

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We need more information to solve this problem. Specifically, we need to know the volume (or concentration) of HCl used to react with the Mg. Without that information, we cannot determine how many grams of Mg reacted.

The standard enthalpy change for the reaction 2A+B⇌2C+2D is  664 kJ/mol and The heat that is absorbed when 3.70 mol of A reacts is 2456.8  J

The heat changes that take place as reactants combine to generate a product are measured by the enthalpy of a reaction.

The following formula can be used to determine the enthalpy change of a reaction:

Hess's law states that

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Considering the given reaction: 2A + B ⇌ 2C + 2D  

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Enthalpy of reaction (ΔH°f) = (2 C + 2 D) - (2 * A + B)

Enthalpy of reaction  (ΔH°f)  = {[2(223) + 2(-523)] - [2(-245) + 2(-387)]}

Enthalpy of reaction  (ΔH°f)  = 664 kJ/mol

ΔH = q ÷ n

ΔH = molar enthalpy (heat) of solution

q = amount of energy (heat) released or absorbed

n = moles of solute

so. q = ΔH xn

q = ΔH xn

q = 664 kJ/mol x 3.70 mol

Q= 2456.8  J

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The amount of water Yun has for experiment is 0.45 gram.

Given,

molar mass of water (H₂O) is 18.02 g/mol.

Yun has 0.025 mol of H₂O

we have to find out amount of water she has for her experiment

number of moles of water = given mass of water / molar mass of water

mass of water = number of moles of water × molar mass of water

= 0.025 × 18.02

= 0.45 gram

Therefore, Yun has 0.45 gram of water for experiment.

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The question is incomplete; the complete question is;

Identify the possible issues if a sample in a spectrophotometer gives no reading. Select one or more:

The wrong wavelength may be set.

The sample may be placed improperly in the cuvette holder.

There may be an issue with the composition of the sample.

There may be an issue with the spectrophotometer

Answer:

The wrong wavelength may be set.

There may be an issue with the spectrophotometer

Explanation:

Substances do not absorb radiation at all wavelengths. The proper wavelength at which a substance absorbs must be used for a reading to be obtained from the spectrophotometer. If this is not done, no reading is obtained from the spectrophotometer.

Generally, if the spectrophotometer has an issue, it may display no reading until the machine is fixed.

The possible issues if a sample in a spectrophotometer gives no reading are:

According to the given question, we are asked to identify the possible reasons why a spectrophotometer would give no reading when a sample is used on it.

As a result of this, it is important to note that it is possible that the sample may not have been placed correctly on the cuvette holder or the wrong wavelength may be set which would cause the no reading error to show.

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Answer:

yeasts, moulds, bread, beer, wine, ...

Explanation:

The atomic weight of Aluminum (AL) is 26.98. It has 14 neutrons. Aluminum has  an atomic number 13. Therefore, option B is correct.

The atomic number of an element represents the number of protons in the nucleus of its atoms. Since the atomic number of an element is unique and determines its position in the periodic table, aluminum has an atomic number of 13.

The number of electrons in a neutral atom is equal to the number of protons, which in this case is 13. Therefore, aluminum has 13 electrons.

The atomic weight of aluminum (Al) is 26.98, which represents the weighted average mass of all the naturally occurring isotopes of aluminum, taking into account their relative abundances. The number of neutrons in an atom of aluminum is given as 14.

Thus, the correct option is B.

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As per the given statement 0.297mol NO can be made when 75 moles of HNO3 are consumed

The inorganic substance with the formula HNO3 is nitric acid. It is a mineral acid that is quite corrosive. The substance is colourless, but older samples have a tendency to have a yellow cast because of breakdown into nitrogen oxides..

'3 Cu + 8HNO3      3 Cu(NO3)2 + 2 NO + 4H₂O

Element  Molar Mass

Hydrogen 1

Nitrogen 14

Copper 63.5

Oxygen 16

Referring  the above table we get  no of moles in HNO3

1(1.0) + 1(14) + 3(16) = 1 + 14 + 48 = 63 g/mol

75g HNO3 x 1 mol HNO3/63 g HNO3 = 1.190 mol HNO3

The coefficient of HNO3 is 8, and NO is 2

1.190 mol HNO3 x 2 mol NO/8 mol HNO3 = 0.297mol NO

Hence, 0.297mol NO can be made when 75 moles of HNO3 are consumed.

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Cu + O2 --->  CuO2 -The first reaction is a combustion reaction

2 HCl + Mg → H2 + MgCl2- The second reaction is a Single replacement reaction

A combustion reaction is a type of chemical reaction that occurs between a fuel and an oxidizer in the presence of heat or light, resulting in the release of energy in the form of heat and light.

In other words, it is a reaction in which a substance reacts with oxygen to produce heat and light.

Combustion reactions are important in many aspects of daily life, including the burning of fossil fuels for energy production, the combustion of wood or other materials for heating or cooking, and the combustion of fuels in internal combustion engines.

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Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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Answer: B.) -12.4

Explanation: This is because the sign of heat transfer is determined by the system's perspective. In this case, the system is releasing heat to the surroundings, which means that heat is flowing out of the system, making the heat transfer negative. The magnitude of the heat transfer is 12.4 J.

Answer:

Substance B

Explanation:

Molar heat of A = 31.2J/mole.°C

Molar heat of B =  11.2 J/mole∙°C.

The molar heat of a substance is the amount of heat that must be added to a mole of a substance to raise the temperature by 1°C.

Answer:

Option B.

Explanation:

Obviously, a cleaning agent companies is going to be a producer of cleaning agents which are chemical substance which are used for the main purpose of removing unwanted particles (dirt).

For this particular Question, option ''B'' is correct because upon the addition of H2O, there will surely be changes in the numbers of ions in the cleaning agents.

From the Question above, we have that the cleaning agents has pH which is too high, therefore in order to reduce the pH of the cleaning agents, water will be used to mix the product or cleaning agents. Upon the addition of water there will be decrease in OH^-.