Can someone please answer these questions for me ??

The statements that collectively explain why radical bromination of 2-methyl pentane is

So the correct option are A, C, and D.

Radical Bromination is described as a process in which a free-radical chain mechanism introduces bromine into a molecule.

The bromine radical removes a hydrogen atom from the methane and because the hydrogen atom only needs to bring one electron with it to form a new bond to the bromine, and so one electron is left behind on the carbon atom.

In the creation of radicals, if  bromine (Br2) is treated with light (hν) it comes to hemolytic cleavage of the Br-Br bond.

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Complete question:

Which statements collectively explain why radical bromination of 2-methylpentane selectively gives the product shown? select all that apply.

a. the rate-determining step is endothermic, and so the most stable alkyl radical forms fastest.

b. the rate-determining step is exothermic, and so the least stable alkyl radical forms fastest.

c. The product shown arises from the most stable radical intermediate

d. The rate-determining step in the reaction is abstraction of a hydrogen atom from 2-methylpentane

e. The rate-determining step in the reaction is addition of a hydrogen atom from 2-methylpentane

1. The bacterial cell shown is a prokaryotic cell.

2a. The similarities between prokaryotic and eukaryotic cells include:

2b. The differences between prokaryotic and eukaryotic cells include:

Eukaryotic cells are cells that possess a membrane-bound nucleus as well as membrane-bound cell organelles.

Eukaryotic cells are cells of higher organisms such as animals and plants.

Prokaryotic cells are cells that lack a membrane-bound nucleus as well as membrane-bound cell organelles.

Prokaryotic cells are cells of lower organisms such as bacteria.

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1. Combustion reaction

2. Single displacement reaction

3. Neutralization reaction

4. Synthesis reaction

5. Decomposition reaction

6. Synthesis reaction

There are different types of chemical reactions. The type of reaction that corresponds to each chemical equation as shown in the image respectively are:

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There are two unpaired electrons in O2. Hence, it is paramagnetic in nature with two unpaired electrons.

The term paramagnetic refers back to the appeal of material to an external magnetic discipline. The term diamagnetic refers to the repulsion of cloth from an external magnetic area. those substances have as a minimum one unpaired electron. these materials don't have any unpaired electrons.

Paramagnetic is the result of an unpaired electron having a magnetic dipole moment. QED dictates that the magnetic moment of an electron arises from its homes of spin and orbital movement, giving it angular momentum inside the quantum feel.

Paramagnetic materials are the ones which can be attracted by using magnetic area and feature impaired electrons. They lose magnetism within the absence of magnetic area. The greater the number of unpaired electrons, the greater the magnetic second of the substance and as a result extra the paramagnetism.

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The following best describes the difference between molar mass and formula weight is a formula weight is the mass of one molecule or formula unit while molar mass  is the mass of one mole of molecules or formula units.

A formula mass is the sum of all masses of atom present in empirical formula. molecular mass is the mass of one mole of molecule. formula weight base on empirical formula while molecular mass is depend on molecule.

Thus, The following best describes the difference between molar mass and formula weight is a formula weight is the mass of one molecule or formula unit while molar mass  is the mass of one mole of molecules or formula units.

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To prepare 100ml of a solution with the 6.0mg/l concentration of a dye and you have a 30 mg/l stock solution of the dye and pure water, 20 ml of pure water should be mixed.

Solutions are made diluting more concentrated stock solutions.certain volume of the stock solution is transferred to a new container and is brought to a new volume.since, the total volume of solute is the same before and after dilution.

                      C0 V0  =  CdVd

            Where, C= concentration of stock solution

                         V= diluted volume of the stock solution

                          C= concentration of diluted solution

                         V= volume of the diluted solution

Here putting the values,

              30 mg/l * vo   = 6.0 mg/l  * 100ml

               VO =  20ml

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An electrolyte is a solution containing a large concentration of dissolved ions.

A solution containing a large concentration of dissolved ions is called an electrolyte. It mainly consists of dissolved cations ,anions. Some of the most important and commonly discussed electrolytes are

Calcium which plays a pivotal role in bone health in the body and muscle contraction and relaxation.

Sodium, which is responsible for maintaining osmolarity and nerve impulse conduction, the lack of sodium ions in the body may lead to Hyponatremia.

Potassium is another important electrolyte which is responsible for normal heart function and skeletal growth.

Chloride ions which are in close coordination with sodium ions in the body help in maintenance of the body's blood pressure. It can be obtained from tomatoes, olives, etc.

The shortage of these electrolytes in the body can cause physiological problems like tiredness, lethargy, sleeplessness and improper growth in case of children. Hence it is crucial for us to include all the electrolytes in our diet and have foods that are rich in water and electrolytes to stay healthy and fresh.

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The mass of hydrogen that will be produced when 195 mg of potassium is added to water would be 5 mg.

From the balanced equation of the reaction:

[tex]2K + H_2O --- > 2KOH + H_2[/tex]

The mole number of the potassium that reacts to the mole of the hydrogen gas that is produced is 2:1.

If 195 mg of potassium reacts:

1 mg = 0.001 g

195 mg = 195 x 0.001

            = 0.195 g

Recall that: mole = mass/molar mass

Molar mass of potassium = 39 g/mol

mole of 0.195 g potassium = 0.195/39

                                             = 0.005 mol

From the stoichiometric mole ratio, the equivalent mole of hydrogen gas produced would be:

       0.005/2 = 0.0025 mol.

Molar mass of hydrogen gas = 2 g/mol

Mass of 0.0025 hydrogen gas = 0.0025 x 2

                                                   = 0.005 g

0.005 g = 0.005 x 1000

             = 5 mg

This means that 0.005 g or 5 mg of hydrogen gas will be produced when 195 mg of potassium is added to water.

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When two compounds are combined and change into a third substance, this is referred to as a biochemical reaction (or chemical reaction). When two substances are combined, not all of them react chemically.

When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that molecules and atoms are ordered, which leads to the formation of new substances with new properties.

Examples for chemicals include the basic building blocks, such as zinc, nitrogen, and oxygen; combinations created from these building blocks, such as water, dioxide, or salt; and more complicated substances, such as the air you breathe, rainfall, a chicken, a car, etc.

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If the TLC plate are left in the chamber for too long after the solvent reached the top the  [tex]R_{f}[/tex] value achieved from experimentation will be different than the expected [tex]R_{f}[/tex] .

The value  [tex]R_{f}[/tex] is the ratio of the distance traveled by the solute to the distance traveled by the solvent. The term comes from chromatography when it was discovered that a particular component in a particular solvent always migrates the same distance under the same conditions.

In chromatography, the value of  [tex]R_{f}[/tex] is the basic requirement of the experiment. It indicates whether the analyte (solute) prefers the stationary or mobile phase. For stationary and mobile phases, the [tex]R_{f}[/tex]  value is used to determine polarity, relative mass, relative solubility, etc.

If the TLC plate is left in the development chamber for too long, solvent will flow to the top of the plate, causing unexpected migration of the chemicals coated on the silica plate. So the experimentally obtained value [tex]R_{f}[/tex] is different from the expected value

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Answer:

Boiling stones should never be added to a hot liquid because that would cause the liquid to boil very fiercely. Now that the distillation is already in progress, first you have to cool down the solution.

Explanation:

When you have forgotten to add boiling stones to your round bottomed distillation flask, but now the distillation is in progress. You should not add boiling stones to the hot liquid, because that can cause that hot liquid to boil fiercely. So, you have to cool down that liquid first and then add boiling stones.

But if you do not add boiling stones in this process, it produces hot spots, which causes splashing out. So, you have to cool down the solution/reaction and then reheat the solution after adding boiling stones.

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The normal combustion of 8.76 g of glycine produces 28.1 kcal while the combustion in the body produces  18.96 kcal.

We know that a combustion reaction is one in which an object is burnt in oxygen. In this case, we have the reaction in which the amino acid is burnt both in oxygen (normal combustion) and the burning of glycine in the body also occurs.

In this case, we have the number of moles of the glycine that has participated in the reaction is; 8.76 g/75 g/mol = 0.12 moles

In the reaction that occurs  by normal combustion;

4 moles of glycine produces 936 kcal of energy

0.12 moles of glycine produces 0.12 moles * 936 kcal/4 moles

= 28.1 kcal

In the reaction that occurs in the body';

2 moles of glycine produces 316 kcal

0.12 moles of glycine produces 0.12 moles * 316 kcal/2 moles

= 18.96 kcal

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Properties of carbon that explain its presence as a basic element of organic compounds - Catenation and Tetravalent.

Carbon is a chemical element with the symbol C and atomic number 6 (it contains 6 protons in its nucleus). As a member of group 14 in the periodic table, it is non-metallic and tetravalent – ​​making four electrons available to form covalent chemical bonds.

The most common isotope of carbon has 6 protons and 6 neutrons and has an atomic mass of 12.0107 AMU. Its basic electronic configuration is 1s22s22p2.

Properties of carbon that explain its presence as a basic element of organic compounds -

Carbon has the ability to form very long chains of strong and stable interconnecting C-C bonds. This property, called catenation allows carbon to form an almost infinite number of compounds.

Carbon has an affinity for bonding with other small atoms, including other carbon atoms, through the formation of stable covalent bonds. Despite the fact that it is present in a huge number of compounds, carbon is weakly reactive compared to other elements under normal conditions.

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A large net force of 280N  is required to accelerate a 2000 kg suv from rest with an acceleration of 0.14m/s2 .

According to Newton’s 2nd law of motion,  force is  equal to the change in momentum per change in time.Acceleration of an object depends on the mass of the object and the amount of force applied.

            Force=mass* acceleration

Here, mass is equal to 2000 kg and acceleration is equals to 0.14m/s/s.putting these values,

      F= ma

     F= 2000kg * 0.14 m/s2

        = 280 kg m/s2

        =280N

So, 280N of force is required.

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The mass of oxygen present in the emphysema patients' cylinder is 19.64grams.

The ideal gas equation is given by,

PV = nRT

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

Mole scan be written as,

Moles = mass/molar mass

Molar mass of oxygen is 16 g/mol.

Here, the volume of the gas is 3 L and the pressure of the gas is 10atm. The temperature of the gas is 298 degrees Kelvin.

Putting the values,

3 x 10 = mass/16 x 0.082 x 298

Mass = 3 x 10/298 x 16/0.082

Mass = 19.64 grams.

The mass of oxygen in the cylinder is 19.64 grams.

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Empirical formula of the anhydrous salt is  CuSiF₆

The formula of the hydrate is CuSiF₆.6H₂O

The molecular formula of a compound is the simplest integer ratio of the atoms present in the compound. As a simple example of this concept, the empirical formula for sulfur monoxide (SO) is simply SO, as is the empirical formula for Di-sulfur dioxide S₂O₂

Consider mass of Cu = 30.9 g

mass of Si = 13.6 g

mass of F = 55.5 g

Now for empirical formula, let's calculate the moles of each element:

Moles of Cu = 30.9/63.5=.49 moles

Moles of Si = 13.6/28.0=.49 moles

Moles of F = 55.5/19=2.92 moles

As you can see the moles of Cu and Si are almost 6 times the moles of F, which result in the empirical formula of salt as;  CuSiF₆

Now, for the formula of  hydrate:

Moles of CuSiF₆ = 1/205.62

= 0 .00486 moles

weight of H₂O = 1.53-1

= 0.53 g

Moles of H₂O = .53/18

= 0.029 moles

CuSiF₆ : H₂O = 0.00486 : 0.029

= 0.029/0.00486

= 1:6

So the molecular formula of hydrate is CuSiF₆.6H₂O

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The answer is 0.0055 grams of glucose (c6h12o6) are in 4.9 moles of glucose

The formula weight is a quantity calculated in chemistry by multiplying each element's atomic weight (measured in atomic mass units) by the number of atoms it has in the formula, and then adding up the results. Sometimes referred to as equation weights, these relative weights computed from the chemical equation. This is how isotropically weighted averages are used to get the molar mass(of glucose) (average molecular weight). This differs from molecular mass, which is the weight of a single molecule made up of distinct isotopes.

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14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration.  the concentration of the HCl solution in the units of mol/l  is 0.212 mol / L.

given that :

volume V1 = 14.55 mL = 0.0145 L

Molarity M1 = 0.3674 M

Volume V2 = 25 mL = 0.025 L

molarity M2 = ?

using the formula for dilution , we get ;

M1 V1 = M2 V2

0.3674 × 0.0145 = M2 × 0.025

M2 = 0.0053 / 0.025

M2 = 0.212 M = 0.212 mol / L

Thus, 14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration.  the concentration of the HCl solution in the units of mol/l  is 0.212 mol / L.

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A solution of 1.52 g of NH4SCN in 100 g of water in a calorimeter decreased in temperature by 3.1 °C when 3.15 g of Ba(OH)28H2O was added. Calculate the approximate amount of heat absorbed by the reaction using the following equation, assuming the specific heat of the solution and products is 4.20 J/g °C:

Ba(OH)2 + 8H2O + 2NH4SCN = 10H2O + Ba(SCN)2(aq), 2NH3(aq), and (l)

A material in one state is transferred into another substance in a different state through the process of absorption in chemistry (e.g., gases being absorbed by a liquid or liquids being absorbed by a solid).

The process of absorption is how the blood takes in the byproducts of digestion so that it can supply the rest of the body. The mucous membrane allows for the passage of the digested materials into the blood or lymph during absorption. The following mechanisms allow for absorption. basic diffusion

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Answer:

The chemical symbol for Magnesium is Mg

Explanation:

As you can see on the periodic table Magnesium is in group two and has the element symbol of Mg

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Aspirin is the sector's most regularly used medicinal drug. The chemical analysis of aspirin indicates that the molecule is 60.00% carbon, 4.44% hydrogen, and 35.56%.

Empirical records.relying on revel in or commentary by myself regularly with out due regard for system and theory. an empirical basis for the idea. Empirical research is primarily based on found and measured phenomena and derives information from actual revel in in place of from principle or perception.

An instance of empirical evaluation might be if a researcher changed into inquisitive about locating out whether or not paying attention to satisfied music promotes prosocial behaviour. An experiment might be carried out where one organization of the target audience is uncovered to happy song and the other isn't always uncovered to track at all.

A element is proof for a proposition if it epistemically supports this proposition or suggests that the supported proposition is authentic. evidence is empirical if it's miles constituted by or available to sensory revel in.

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Explanation:

permutit is an artificial zeolite chemically it is

hydrated sodium aluminum orthosilicate with the formula

Na2AI2Si208. XH20

You can find the mass and volume of the pure metal then compare the density with the table of densities to determine which metal.

Density is a term used to describe how tightly a substance is packed. It fits that criteria of mass per unit volume. Formula for Density or Density Symbol: D The formula is: = m/V where is the object's mass, m is its density, and V is its volume. The term "mass" is used to describe how much matter there is in a thing. Mass is often represented in kilogrammes (kg) or grammes (g) (kg). The most common units of mass measurement are kilogrammes (kg) and grammes (g). No matter where in the cosmos it is or how much gravitational force is exerted on it, mass is a measure of how much matter there is.

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Neutral lithium is oxidized and changed into Li+ at the anode. When the electrons from the anode reaction are received at the cathode, this causes the reduction of Co(IV) to Co(III).

The biological aerobic system (BOD) of wastewater is decreased after oxidation, which also lessens some contaminants' cytotoxicity. Some contaminants undergo this treatment and are transformed into dioxide, water, and sludges. Disinfection is commonly accomplished using chemical oxidation.

The reaction brought on by coming into touch with oxygen molecules is known as oxidation. These materials can be non-metals like live tissues or metals. Technically speaking, oxidation is the removal of one electrons during the phase of interaction between two or more atoms.

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A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.

Alkynes are hydrocarbons which contain carbon-carbon triple bonds. Their general formula is CnH2n-2 for molecules with one triple bond (and no rings).  the compound contains 6 Carbon atoms, its said to be an alkyne therefore compound should contain a triple bond.

There should be single C as chiral centre. This means that one carbon has 4 different groups attached to it. In the diagram shown has one carbon connected to

1- Hydrogen

2 - CH3 group

3 - C2H5 group

4 - C≡CH

All these groups are of different types, hence the C is a chiral centre .

therefore A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.

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The percent yield that we get is 56%.

Here it is given the actual yield is 42g and the theoretical yield is 75g

We have to find the percent yield.

Percent yield:

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by the theoretical yield multiplied by 100%. If the actual and theoretical yield ​is the same, the percent yield is 100%

Formula to calculate percent yield:

Percent yield = actual yield/ theoretical yield × 100

= 42 / 75 × 100

= 56%

Therefore the percent yield is 56%.

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If a balloon has a volume of 33000 L, the amount of hydrogen that would be needed to fill will be 29.46 kg.

At standard temperature and pressure, 1 mole of any gas is equivalent to 22.4 L of the gas.

The capacity of the balloon is 33000 L. The number of moles of hydrogen gas that will fill the balloon can be calculated using dimensional analysis as follows:

1 mole = 22.4 L

33000 L = 1 x 33000/22.4

               = 1473.21 moles

This means that 1473.21 moles of hydrogen will be required to fill the balloon.

Recall that: mole = mass/molar mass

Hence: mass = mole x molar mass

Molar mass of hydrogen gas = (1+1)

                                                = 2 g/mol

We can then use the above formula to calculate the mass of 1473.21 moles of hydrogen.

mass of 1473.21 moles hydrogen = 1473.21 x 2

                                                       = 2946.43 grams

2946.43 grams to kg = 2946.43/1000

                                   = 29.46 kg

In other words, if a balloon has a capacity of 33000 L, the amount of hydrogen that would be required to fill it will be  29.46 kg.

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The two geologic events which occur very slowly as a result of tectonic forces and movement are convection in the mantle and plate subduction.

This is a term which is referred to as the process in which there is collision between two of Earth's tectonic plates, where one plate sinks into the mantle underneath the other plate.

This is caused by geologic events which occur very slowly as a result of tectonic forces while on the other hand, mountains and volcanoes occur abruptly which is therefore the reason why options A and C were chosen as the correct choice.

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Answer: A and C

Explanation: