Which of the following are equal to 32°F?
A. 0°C
B. 273 K
C. 100°C
D. 373 K

The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Answer: C

Explanation:

The total pressure inside the tank is 95 atm. To calculate the total pressure, we need to sum up the partial pressures of each gas.

The partial pressures represent the individual pressures exerted by each gas if it occupied the entire volume of the tank alone. In this case, we have 30 atm of oxygen (O2), 15 atm of nitrogen (N2), and 50 atm of helium (He). Adding these values together, we get 30 atm + 15 atm + 50 atm = 95 atm. Therefore, the total pressure inside the tank is 95 atm.

In a mixture of gases, the total pressure is the sum of the partial pressures of each individual gas. This concept is known as Dalton's Law of Partial Pressures. According to Dalton's Law, the total pressure exerted by a mixture of non-reacting gases is equal to the sum of the pressures that each gas would exert if it were present alone in the same container.

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Answer:

It is one of the six Little Wizard Stories of Oz. The Cowardly Lion and the Hungry Tiger have grown bored with their guard duty at Ozma's throne in the Royal Palace of the Emerald City. The Lion wants to attack a man and make "chop suey of him." The Tiger longs, at last, to satisfy his hunger for a fat baby.

Explanation:

i hope this help u

This problem is providing the densities of iron, gold and platinum and asks for the two correct answers which turned out to be "For equal volumes of all three substance, platinum will be the heaviest" and "For equal masses of all three substances, iron will occupy the most amount of space".

In science, we define density as the degree of compactness of a substance and the mathematical formula can be written as:

\(\rho = m/V\)

Thus, we can see that the greater the mass the greater the density and the greater the volume the lesser the density, which are directly and inversely proportional relationships, respectively.

In such a way, if we have equal masses, say 1 g, one can see that the most of the volume will be occupied by the element with the lowest density, in this case iron, for that reason, the first correct statement is "For equal masses of all three substances, iron will occupy the most amount of space".

On the other hand, if we have equal volumes, say 1 cm³, one concludes that the heaviest element is the one of the greatest density, in this case platinum, so that the second correct statement is "For equal volumes of all three substance, platinum will be the heaviest".

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Epiphyseal plate is the layer of cartilage responsible for bone growth that ossifies into epiphyseal line.

Photographic superimposition compares photos, while craniofacial reconstruction creates 3D model of a person's face based on skeletal remains.

The teeth in skeletal remains of a 4-year-old child are primary, while those of an 8-year-old are a mix of primary and permanent.

Growth plate (epiphyseal plate) and cartilaginous line (epiphyseal line):

The growth plate, also known as the epiphyseal plate, is a layer of hyaline cartilage found in children's bones. It is responsible for bone growth and is located at the end of long bones. As the bone grows, the growth plate gradually ossifies and transforms into a bony structure called the epiphyseal line or cartilaginous line. The epiphyseal line is a marker of the cessation of bone growth, and it is commonly used to estimate a person's age at death during forensic investigations.

Photographic superimposition and craniofacial reconstruction:

Photographic superimposition is a technique used to compare two photographs of a person's face. One of the photographs is of the person when they were alive, and the other is a photograph of their skeletal remains. The photographs are superimposed, and the forensic analyst compares the two images to identify similarities and differences. This technique is used to identify a person based on their skeletal remains.

Craniofacial reconstruction is a technique used to create a three-dimensional model of a person's face based on their skeletal remains. This technique is used when the person's identity is unknown, and it involves creating a replica of the person's skull and using it as a basis for creating a facial reconstruction. The reconstruction is based on the person's sex, age, and ethnic background, and it is used to aid in the identification of the individual.

The teeth found in the skeletal remains of a 4-year-old child and the teeth found in the skeletal remains of an 8-year-old child:

The teeth found in the skeletal remains of a 4-year-old child and an 8-year-old child are different. At 4 years old, a child will typically have 20 primary teeth, also known as baby teeth. These teeth are smaller and have thinner enamel than permanent teeth, which begin to erupt around the age of 6. By the age of 8, a child will have a mixture of primary and permanent teeth, with 32 permanent teeth ultimately replacing the baby teeth. The permanent teeth are larger and have thicker enamel than the primary teeth. By examining the teeth found in the skeletal remains of a child, forensic analysts can estimate the child's age at death and identify any developmental abnormalities or trauma.

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(a) Corrosion Penetration Rate (CPR) is a measurement of the thickness of a material's corrosion layer in terms of linear millimeters per year. Corrosion Penetration Rate is an important parameter that is widely used in the corrosion field to estimate the corrosion rate of a metal.

The penetration rate is determined by exposing a metal sample to the corrosive environment and measuring the quantity of metal that has been lost due to corrosion over a certain period of time. The formula used to calculate CPR is: CPR = Weight loss of the sample (mg) x 31556926.0 / A x D x t Where, A= Surface area of the sample (m²), D= Density of the sample (g/cm³), t= Exposure time in seconds

(b)Deterioration mechanism of polymetric materials:

(i) Thermal degradation: It is the process in which chemical decomposition occurs when a polymer is exposed to elevated temperatures, which can result in the loss of essential properties of the polymer.

(ii) Weathering: The process by which a polymer's structure and properties are altered as a result of exposure to the natural elements is referred to as weathering.

(c) Consequences of corrosion:

(i) Riveting a steel plate with copper rivets: When riveting a steel plate with copper rivets, galvanic corrosion is caused as a result of the contact between copper and steel. The steel will corrode more quickly than it would if it were in contact with a material that is less reactive than copper.

(ii) Connecting buried steel pipework to zinc plates: Connecting buried steel pipework to zinc plates can cause galvanic corrosion. Because zinc is more reactive than steel, the zinc plate corrodes and prevents the steel pipe from corroding. As a result, the zinc plate will corrode away, leaving the steel pipe vulnerable to corrosion.

(d) One-half of an electrochemical cell consists of a pure nickel electrode in a solution of Nid'ions, other half is a cadmium electrode immersed in a Cda solution. If the cell is a standard one:

(i) Spontaneous overall reaction: Ni(s) + Cd²⁺ (aq) → Cd(s) + Ni²⁺ (aq)

(ii) The voltage generated by the cell is: E°cell = E°cathode - E°anode

E°cell = E°Cd - E°Ni

E°cell = (-0.40) - (-0.25)

E°cell = -0.15V

Therefore, the voltage generated by the cell is -0.15V.

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The molarity of the base is 4.20 M.

The balanced chemical equation for the reaction between sulfuric acid (H2SO4) and magnesium hydroxide (Mg(OH)2) is given below:

H2SO4 + 2Mg(OH)2 → MgSO4 + 2H2O

The stoichiometric ratio of H2SO4 to Mg(OH)2 is 1:2. Hence, 1 mole of H2SO4 requires 2 moles of Mg(OH)2 to neutralize.

Let's calculate the number of moles of H2SO4 using the given concentration and volume:

Moles of H2SO4 = concentration × volume (in L) = 3.50 M × 0.0150 L = 0.0525 mol

Now, using the stoichiometric ratio, we can calculate the number of moles of Mg(OH)2 required:

Moles of Mg(OH)2 = 2 × moles of H2SO4 = 2 × 0.0525 = 0.105 mol

Let's calculate the molarity of the base now.

We have 0.105 moles of Mg(OH)2 in a volume of 25.0 mL.

We need to convert this volume to liters to get the molarity:

Molarity of Mg(OH)2 = moles of Mg(OH)2 / volume (in L)Volume of Mg(OH)2 = 25.0 mL = 0.0250 L Molarity of Mg(OH)2 = 0.105 mol / 0.0250 L = 4.20 M

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Answer: A 5 M sample of hydrogen peroxide decomposes more rapidly than a 2M sample of the same volume, and Calcium carbonate deteriorates more rapidly in polluted air than in clean air

Explanation:

The chocolate chips that are in one mole of chocolate chips is 6.02214 × 10²³ chips.

The mole of a substance is defined as the amount of substance that is my are up of 6.02214 × 10²³ particles and this number is called the Avogadro's number.

This means that 1 mole of substance= 6.02214 × 10²³ of particles that makes up the substance.

The Avogadro's number is a constant used for all substances such as the chocolate chips.

That is to say, one mole of the chocolate chips has a mass of 0.324 g but contains 6.02214 × 10²³ particles of chocolate chips.

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The number of chocolate chips that are included inside one mole of chocolate chips is equal to 6.02214 ×10^23 chips.

The quantity of a material that may be made up of 6.02214 ×10^23 particles is referred to as a mole, and this number is known as Avogadro's number. The mole is the unit of measure used to describe this quantity.

This indicates that there are 6,02214×10^23 particles in one mole of the material, which implies that one mole of the substance is equal to one mole.

Avogadro's number is a constant that is applied to many different kinds of things, including chocolate chips.

In other words, one mole of chocolate chips has a mass of 0.324 g, yet it includes 6.02214 ×10^23 individual chocolate chip particles.

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Since K3 is greater than 1, the reaction is thermodynamically favorable.

Data;

This states that the heat change in a given chemical reaction is the same irrespective of the number of process in which the reaction is effected.

Using Hess Law;

\(rxn_3 = rxn_1 * 2rxn_2\\k_3 = k_1 * k_2^2\\k_3 = 2*10^-^6 * (1*10^3)^2\\k_3 = 2\)

substituting this using Gibbs law,

\(\delta G^0_3 = -RT\ln K_3\\\delta G^0_3 < 0\)

Since K3 is greater than 1, the reaction is thermodynamically favorable.

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The mixture of phenol and benzoic acid is separated by adding \(NaHCO_{3}\)  to produce brisk effervescence with sodium benzoate .

When benzoic acid react with \(NaHCO_{3}\) then sodium benzoate is produced which is soluble in water and separated from non aqueous solvent . Organic compounds are soluble in organic solvent and inorganic compound mainly soluble in inorganic solvent like water.

What is brisk effervescence?

Brisk effervescence is when continuous gas evolution occurs in a chemical reaction like CO2. When HCl is added in \(NaHCO_{3}\) then CO2 evolved.

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Answer:

2 moles NaClO3

Explanation:

2NaClO3 --> 2NaCl + 3O2

moles NaClO3 = 3 moles O2 x (2 moles NaClO3/3 moles O2) = 2 moles

conversion factor: 2 moles NaClO3 = 3 moles O2

In order to produce 3 moles of \(O_{2}\), the chemical reaction needs to be balanced. the required number of moles of \(NaClO_{3}\) are 2.

When the reactants undergo a chemical reaction, the number of moles on both the reactant and the product side must be balanced.

The chemical reaction of \(NaClO_{3}\) is

2 \(NaClO_{3}\)⇄2NaCl  + 3 \(O_{2}\)

On the left side, 2 moles of \(NaClO_{3}\) breaks into 2 moles of NaCL and 3 moles of \(O_{2}\). on the right side. Therefore, both side have an equal number of moles of each element.

Hence, two moles of \(NaClO_{3}\) is required to produce 3 moles of \(O_{2}\).

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Answer:

There are primarily two forms of bonding that an atom can participate in: Covalent and Ionic. Covalent bonding involves the sharing of electrons between two or more atoms. Ionic bonds form when two or more ions come together and are held together by charge differences.

Explanation:

If the concentration of NaCl is 4.86 m, when it begins to crystallize out of solution, then is the ksp is 23.61

the reaction is given as:

NaCl --->  Na⁺   +   Cl⁻

               4.86      4.86

The Ksp for the following is given as :

ksp = [Na⁺] [Cl⁻]

ksp = 4.86 × 4.86

ksp = 23.61

The solubility product constant ksp is the type of equilibrium constant. the solubility product constant ksp increases with increase in temperature with increase in the solubility.

Thus, If the concentration of NaCl is 4.86 m, when it begins to crystallize out of solution, then is the ksp is 23.61 .

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Answer: The mass density is 1166.36 \(kg/m^{3}\).

Explanation:

Given: Weight of sample in air \((F_{air})\) = 500 N

Weight of sample in alcohol \((F_{alc})\) = 200 N

Specific gravity = 0.7 = \(0.7 \times 1000 = 700 kg/m^{3}\)

Formula used to calculate Buoyant force is as follows.

\(F_{B} = F_{air} - F_{alc}\\= 500 - 200 \\= 300 N\)

Hence, volume of the material is calculated as follows.

\(V = \frac{F_{B}}{\rho \times g}\)

where,

\(F_{B}\) = Buoyant force

\(\rho\) = specific gravity

g = acceleration due to gravity = 9.81

Substitute the values into above formula.

\(V = \frac{F_{B}}{\rho \times g}\\= \frac{300}{700 \times 9.81}\\= \frac{300}{6867}\\= 0.0437 m^{3}\)

Now, mass of the material is calculated as follows.

\(mass = \frac{F_{air}}{g}\\= \frac{500 N}{9.81}\\= 50.97 kg\)

Therefore, density of the material or mass density is as follows.

\(Density = \frac{mass}{volume}\\= \frac{50.97 kg}{0.0437 m^{3}}\\= 1166.36 kg/m^{3}\)

Thus, we can conclude that the mass density is 1166.36 \(kg/m^{3}\).

Answer:

43.84 g/mol

Explanation:

We use the ideal gas law to find the number of moles of gas present.

So PV = nRT where P = pressure of gass = 0.757 atm, V = volume of gas = 220 mL = 0.22 L, T = temperature of gas = 25 °C = 273 + 25 = 298 K and R = molar gas constant = 0.082 L atm mol⁻¹K⁻¹.

So, n = PV/RT = 0.757 atm × 0.22 L/(0.082 L atm mol⁻¹K⁻¹ × 298 K) = 0.16654 L atm/24.436  L atm mol⁻¹ = 0.00682 mol.

Since mass of gas m = 0.299 g

and n = m/M where M = molar mass of gas

So, M = m/n

\= 0.299 g/0.00682 mol

= 43.84 g/mol

So, the molar mass of the gas is 43.84 g/mol

Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.

The major product is 3-methyl-2-pentene and the minor product is 2-ethyl-1-butene.

The alkyl halide shown is 3-bromo-3-methyl pentane. We can see that it is a tertiary alkyl halide. The proportion of products formed during the reaction are determined by Markovnikov rule.

The two products of this reaction are; 3-methyl-2-pentene and 2-ethyl-1-butene. The major product is 3-methyl-2-pentene because it is formed from a more stable carbocation intermediate.  2-ethyl-1-butene is the minor product.

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Answer:

Indepent variable

Answer:

Scientific Question. A scientific question can be answered through an investigation. What is tested? Scientists call this an independent variable.

Explanation:

The correct option is (e) none of these ,Valency is the ability of an element to combine.

Valency is the ability of an element to combine. Elements in the same group of the periodic table have the same valency. An element's valency is determined by how many electrons make up its outer shell.

A property of an element called "valency" defines how effectively it can meld with other elements. It is a way to count how many electrons are in an atom's outermost shell.

An atom's stability is determined by its valence electrons. Additionally, valence electrons are in charge of an atom's stability. The Octet Rule states that atoms often gain or lose electrons to reach the octet state, which is defined as having eight electrons in their valence shell. They stabilise at this stage.

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Answer:

Hi

Please mark brainliest ❣️

Thanks

Explanation:

Correct answer is D

Energy A

Look at this

Energy required to break bonds that is intermolecular forces

To synthesize 2-methylpentan-3-one efficiently, following process has to be followed:

Start with the synthesis of 2-methylpentan-3-ol, which can be prepared via a Grignard reaction. Firstly, prepare 2-methylpentan-3-ol by reacting ethyl magnesium bromide with 3-methylbutanal.

Afterward, hydrolysis of this Grignard reagent using HCl or dilute sulfuric acid provides the alcohol.2-methylpentan-3-ol.

( Grignard reaction -The Grignard reaction is an organometallic chemical reaction in which carbon alkyl, allyl, vinyl, or aryl magnesium halides (Grignard reagent) are added to the carbonyl groups of either an aldehyde or ketone. This reaction is important for the formation of carbon–carbon bonds.)

Now,the oxidation of 2-methylpentan-3-ol is carried out using oxidizing agents like PCC (pyridinium chlorochromate), PDC (pyridinium dichromate), or Jones reagent to synthesize 2-methylpentan-3-one.Oxidation of 2-methylpentan-3-ol to synthesize 2-methylpentan-3-one can be represented as follows: PCC or PDC or Jones Reagent2-methylpentan-3-one.

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Answer:

+27 66 514 3800

Explanation:

Use the edit icon to pin, add or delete clips.

Answer:

The answer is C.

Explanation:

Answer:

C is right i yeah C is right

Answer: The answer is 457.9

Explanation: Realistically all you have to do is add both of the temperatures and then you can figure out the original heat. Since the heat drops 426.7 degrees and it comes to 31.2 degrees its 426.7 + 31.2 = 457.9.

Answer:

Alcohol in Your Body

Alcohol reaches your brain in only five minutes, and starts to affect you within 10 minutes. After 20 minutes, your liver starts processing alcohol. On average, the liver can metabolize 1 ounce of alcohol every hour.

Explanation:

hope that helps you i just love sharing glmv sorry

Answer:

47.9L of oxygen would be required

Explanation:

Assuming oxygen gas is at STP

Based on the reaction:

S₈ + 12 O₂ → 8SO₃

1 mole of S₈ (Molar mass: 256.52g/mol) reacts with 12 moles of oxygen.

To solve this question we must find the moles of S₈ added. With the reaction we can find the moles of O₂ and using PV = nRT we can find the volume of oxygen required:

Moles S₈:

45.7g * (1mol / 256.52g) = 0.178 moles S₈

Moles O₂:

0.178 moles S₈ * (12 moles O₂ / 1mol S₈) = 2.138 moles O₂

Volume O₂:

PV = nRT

V = nRT / P

Where V is volume

n are moles = 2.138 moles

R is gas constant 0.082atmL/molK

T is absolute temperature = 273.15K at sTP

P is pressure = 1 atm at STP

V = 2.138mol*0.082atmL/molK*273.15K / 1atm

V = 47.9L of oxygen would be required

Answer:

180.2 L

Explanation:

The mass of oxygen gas produced, given that 15.8 g of potassium permanganate is heated until no more oxygen gas is given off is 1.6 g

From the question given, the following data were obtained:

The mass of oxygen gas produced from the reaction can be obtained as follow:

Mass of potassium permanganate = Mass of remaining substance + mass of oxygen

Inputting the given parameters, we have:

15.8 = 14.2 + mass of oxygen

Collect like terms,

Mass of oxygen = 15.8 - 14.2

= 1.6 g

Thus, we can conclude that the mass of oxygen gas produced from the reaction is 1.6 g

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