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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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The electronegativity going from left to right in the periodic table increases from left to right in the row of the periodic table

electronegativity decreases down the column.

The most ionizable elements are not the most electronegative.

Electronegativity increases from left to right this is because the number of protons in the nucleus increases as you move from left to right on the periodic table. As a result, the electron affinity increases from left to right on the periodic table.

Electronegativity decreases down the group because when we move down the group  the atomic size increases and the effective  nuclear decreases

The most ionizable cannot be more electronegative as they lose their outer electrons to be ionized while electronegative gain an electron to be stable.  

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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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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 compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the  chemical formula for the compound is (NH₄)₂SO₄.

The ammonium ion is a polyatomic cation - NH₄⁺ and the polyatomic anion that is sulfate ion - SO₄²⁻. The polyatomic cation and the polyatomic anion combine and for the polyatomic ionic com pounds. Ionic bond is formed between a positively charge ion and the negatively charge ion.

Thus, A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the  chemical formula for the compound is (NH₄)₂SO₄.

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The correct statement is "groups are vertical columns, while periods are horizontal rows".

The chemical elements are shown in tabular form on the periodic table, sometimes referred to as the periodic table containing the elements. It is frequently used in physics, chemistry, and some other sciences, and thus is frequently regarded as a symbol of chemistry.

The Periods were the horizontal rows of the periodic table. The periodic table contains seven distinct periods in all. They have the same amount of electron shells and thus are symbolized by the exact overall number of valence electron.

In a periodic table, the horizontal rows were known as periods, while the vertical columns were known as groups.

Therefore, the correct answer will be option (a).

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Answer:

groups are vertical columns, while periods are horizontal rows

Explanation:

108.10 g of sodium chloride will be produced if 42.5 grams of sodium metal react with excess chlorine.

The mechanism that chemists employ to quantify quantities in reactions is known by the fancy name of "stoichiometry." The coefficient ratio established using balanced reaction equations is used to establish links between the reactants and products in reactions.

Equation formed:

2Na + Cl₂ = 2NaCl

Molar mass :

Sodium (Na) - 23 g/mol

Chlorine (Cl₂) - 35.5 × 2 = 71 g/mol

Sodium chloride (NaCl) = 23 + 35.5 = 58.5 g/mol

molar stoichiometric ratio of sodium & chlorine in reaction = 2 : 1.

42.5 grams of sodium contain 3.4/23 or 1.848 moles.

1 g of chlorine has 0.014 moles, or 1/71 of a mol.

Only 1.848/2 = 0.924 mol of chlorine are required to completely transform 1.848 mol of sodium into sodium chloride. Sodium is the limiting reactant, whereas chlorine is the surplus reactant.

In the reaction, the mole ratio of sodium to sodium chloride is 2: 2, which may be expressed as 1: 1.

1.848 mol of sodium utilized equals 1.848 mol of sodium chloride generated.

Molar mass equals moles of sodium chloride times the mass of 1.848 mol of sodium chloride.

m = (58.5 g/mol) × 1.848 mol

m = 108.10 g

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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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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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Answer:

1. 0.48 M  2. 0.00814 M  3. 0.1276 M

Explanation:

1. Convert the 40 g to moles using the molar mass of C6H12O6:

40 g C6H12O6/180.16 g C6H12O6 = 0.222 mol

Then divide the number of moles by liters to find molarity:

0.222 mol/1.5 L = 1.48 M

2.  Convert the 1.55 g to moles using the molar mass of KBr:

1.55 g KBr/119 g KBr = 0.013025 mol

Then divide the number of moles by liters to find molarity:

0.013025 mol/1.60 L = 0.00814 M

3. Convert the 9.5 g to moles using the molar mass of NaOCl:

9.5 g NaOCl/180.16 g NaOCl = 0.1276 mol

Then you divide the number of moles by liters to find molarity:

0.1276 mol/1 L = 0.1276 M

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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Answer:

First ionization energy decrease

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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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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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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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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K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2− with Z = 16 has the largest radius.

What is atomic radius ?

Atomic radius is generally given as the total distance from the nucleus to the outermost orbital of an electron. Simply put, it can be defined as analogous to the radius of a circle, where the center of the circle is the nucleus and the outer edge of the circle is the outermost orbit of the electrons. As you begin to move or move down the periodic table, trends emerge that help explain how atomic radii change.

The net nuclear charge (Zeff) of an atom is the net positive charge experienced by the valence electrons. Not all of the positive charge is seen by valence electrons, as some of the positive charge is masked by core electrons. A detailed explanation of shields and effective nuclear charges can be found here. Zeff greatly influences the atomic size of an atom. So a decrease in Zeff results in an increase in atomic radius. This is because the electrons are more shielded from the nucleus and the attractive force between the nucleus and electrons is reduced. Zeff decreases from right to left down the periodic table down the group, so the atomic radius increases as the group moves down the periodic table from right to left.

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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

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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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 intial temperature of both the acid and the base were 22.6 oc, but they rose to 28.2 oc during the reaction. if the calorimeter constant was 78.5 j/oc   Initial temperature = final temperature - change in temperature

Initial temperature is the average temperature of the contents of the coldest processing container at the start of the thermal processing cycle, as determined by thoroughly stirring or shaking the filled and sealed container. 32°F (0°C). Tell your audience that the freezing point is the  intial temperature at which fresh water begins to freeze. When a liquid turns into a solid, that temperature is known as the freezing point. Water turns from a liquid to a solid at a temperature of 32°F (0°C), which is known as the freezing point.

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Explanation:

permutit is an artificial zeolite chemically it is

hydrated sodium aluminum orthosilicate with the formula

Na2AI2Si208. XH20

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 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:

The temperature, pressure, and precipitation conditions of the atmosphere for a specific place on a given day is called weather, whereas a longer-term view of these same factors, typically taken over a period of many years, is called climate.

We can describe the weather of the place as the temperature or atmosphere of a place on a certain day. On the other hand, the climate is the long-term weather condition of a place. The climate describes the average weather of the place.

A climate tends to remain unchanged for a place over several years whereas the temperature is the regular day-to-day change in the atmospheric conditions.

The climate of a region is determined by the average atmospheric conditions of a place that are recorded and observed over a long period of time.

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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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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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Magnesium would be chosen to produce the hydrogen gas .

What is Chemical reaction ?

There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.

Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.

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