3) What is the mass of 1 mole of selenium (Se)?

The best way to test for lead in pewter is using a lead test kit from the hardware store. This involves swabbing an area of metal with test chemicals and looking for a color change. For most kits, pink or red indicate lead. .

30 percent lead and 70 percent tin were the main components of ancient pewter. When exposed to acidic foods, this type of pewter, often known as black metal, quickly leached away its lead.

It's vital to remember that early pewter contained a lot of lead. Due to the deadly nature of lead, daily or regular use caused the chemical to leak out of the plate, spoon, or tankard and swiftly enter the body.

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There are two peaks for anhydride at the above freq. our peaks are at 1759 cm-1 and one at 1838 cm-1  between two carbony1 group increases the freq. while resonance lowers the frequency.    

peak at 1100cm-1 C-O

PEAK at 1600 CM-1 alkene

2850 CM-1-3000 CM-1 ALKANE STRETCH.

3150 CM-1 ALKANE STRETCH

While cracking the dimer it will give us monomer which then reacts with maleic anhydride to give Diels-Alder product. It does not give any unwanted product at higher temperature. If  monomer reaction was low temperature and cracked.

Breaking the dimer at high temperature and it is to be reacted immediately can isolate the pure product.

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The acid-base reaction is Lewis acid-base reaction with [tex]BF_3[/tex] as Lewis acid and cyclohexanol as Lewis base.

First, we must determine if this reaction is Lewis acid-base or Bronsted acid-base.

The given reaction is can be considered as Lewis acid-base. Then we must find the Lewis base and Lewis acid. Lewis base is an electron donor and Lewis acid is an electron acceptor. So from the given reaction, we can determine the [tex]BF_3[/tex] is Lewis acid because it is an electron acceptor and cyclohexanol is Lewis base because it is an electron donor.

The complete reaction is in the attached image.

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Answer:

Mass of Magnesium Chloride = 26.85 grams

Percentage of Magnesium= 25.5 %

Percentage of Chlorine =74.5 %

Explanation:

Mass of Magnesium Chloride= Mass of magnesium + Mass of Chlorine        6.85 grams + 20.0 grams = 26.85 grams

Percentage of Magnesium = 6.85 grams/26.85 grams x 100% = 25.5%

Hence, Magnesium = 25.5 %

Percentage of Chlorine = (20.0 grams/26.85 grams) x 100 % = 74.5%

Hence, Chlorine = 74.5 %

So, the compound is 25.5 % magnesium and 74.5 % Chlorine by mass.

ClF5 has a mole concentration of 0.300 moles, or 39.1 grams.

Chlorine pentafluoride gas's starting temperature is -17.0 °C (256 K).

The gas's initial volume is 35.0 L.

The measurement's pressure is 0.180 atm.

Chlorine pentafluoride has a mol mass of 130.445 g/mol.

p*V= n*R*T

n = (p*V) / (R*T)

n = the quantity of moles. To Be Determined Chlorine Pentafluoride

with p = the pressure of the gas = 0.180 atm

with V = the volume of the gas = 35.0 L

with R = the gas constant = 0.08206 L* atm/mol*K

with T = the temperature = -17 °C = 256 K

n = (0.180 * 35.0)/ (0.08206*256)

n = 0.300 moles

Mass ClF5 = moles ClF5 * molar mass ClF5

Mass ClF5 = 0.300 moles *  130.445 g/mol

Mass ClF5 = 39.1 grams

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For some reason my bff think's people also use this website for dating  that is true.

Dating: The 3 Types

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Williams Field experiences short, chilly summers, lengthy, chilly, snowy, windy winters, with seasonal partial cloudiness. The average annual temperature ranges from -20°F to 32°F, with uncommon excursions below -32°F or as high as 37°F.

Climatic Conditions at the Williams Field

From November 23 to February 7 is the warm season, which lasts 2.5 months and has an average daily high temperature of more than 24°F. Williams Field experiences its warmest weather in January, with an average high temperature of 31°F and low temperature of 23°F.

The average daily high temperature during the 5.3-month cold season, which runs from April 19 to September 28, is below -2°F. With an average low of -20°F and a high of -10°F, August is the coldest month of the year at Williams Field.

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Left ear, right foot, glove, and nail shell are examples of chiral objects; while nail, baseball bat, and wooden spoon are examples of achiral objects.

Chiral objects are not identical in all respects (that is superimposable) with their mirror image.  Chiral objects have a 'handedness', for instance, ears, golf clubs, scissors, feet, hands, gloves, shoes, nail shells, and a corkscrew.

On the other hand, achiral objects are identical with (superimposable on) their mirror image. Achiral objects do not possess a handedness, for instance, a baseball bat (no writing or logos on it), a wooden spoon, a plain round ball, a pencil, a T-shirt, and a nail.

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The correct reagent for the given question are as follows:

1) AlCl₃ - CH₃Cl

2) HNO₃ -H₂SO₄ at room temperature

3) Fuming HNO₃ -H₂SO₄ at temperature 90-100 ⁰ C.

In 1st step Benzene is being converted to Toluene .

Benzene is being converted to toluene by the method of Friedel Craft Alkylation of benzene . In this reaction AlCl₃ and CH₃Cl is used as reagent. Electrophile CH³⁺ is produced which is attached on carbon of benzene and the formation of Toluene and HCl occur.

In 2nd step Benzene is being converted to Dinitritoluene .

Dinitritoluene is being prepared from toluene by Nitration. This reaction proceeds by the mechanism of Electrophilic substitution mechanism . HNO₃ and H₂SO₄ are the reagents that are used for the proceeding of reaction at room temperature. These reagents produces NO₂⁺ ( nitronium ion ), which is an electrophile which attacks on C₂ and C₄ Carbon atoms of Toluene.

In 3rd step Benzene is being converted to 2,4,6- trinitrotoluene.

This reaction is the result of extended nitration of the toluene . Further nitration is only can be done in extreme condition . The reaction occurs in the temperature of 90- 100 ⁰ C . Due to rise in temperature there is more production of NO²⁺ ion occurs from HNO₃ - H₂SO₄ and they attack on C6 carbon atom of dinitrotoluene which forms 2,4,6- trinitrotoluene.

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Metals are more malleable and ductile than ionic and covalent substances because the electrons in them are shared among all of the metal atoms in the sample as a "sea of electrons" that surrounds the metal ions.

It is assumed that this electron sea around the metal atoms is the main reason of the great conductivity, malleability, and ductility that make metals unique.

The electron sea in a metallic body allows metal ions to readily travel past one another and twist the metal without breaking it. However, because of the strong chemical connections that keep ionic and covalent molecules together, it is more difficult to change them without rupturing the bonds. Ionic and covalent compounds are therefore less malleable and ductile than metals.

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The type of structure illustrated in the question is hydrogen atom.

An atom of the chemical element hydrogen is known as a hydrogen atom. The Coulomb force holds a single positively charged proton and a single negatively charged electron to the nucleus of the electrically neutral atom.

Atoms are the fundamental building units of all stuff. Protons, electrons, and neutrons are even smaller particles that make up atoms. In terms of mass, protons and neutrons, which reside in the atom's nucleus, are nearly similar. Neutrons have no charge, whereas protons have a positive charge. Electrons are far less heavy than the other particles, have a negative charge, and orbit the nucleus in shells or electron orbitals.  

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The Valence shell electronic configuration of C,N and H are He2s²2P², He2S²2P³ and 1S² respectively.

Valence measures how many electrons an atom must receive or lose to reach the Valence shell electronic configuration of the nearby noble gas or inert gas. Valence electrons are the empty electrons in the outer shells of atoms.

Due to their higher energy content compared to electrons in inner orbits, valence electrons participate in chemical processes. The amount of valence electrons in an element also influences its chemical characteristics, including its valence or valency and the ability to form bonds with other elements. It also reveals the quantity of unpaired electrons, the number of atoms that can participate, and how easily bonds can form between atoms.

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There are a lot of different enzyme that catalyzes different reactions. The steps of catalysis cycle of an enzyme action are

An enzyme is act as a biological catalyst. It is a biochemical substance that aids in accelerating and improving the efficiency of bodily reactions. Our body's ability to function depends on enzymes.

The following steps can be used to describe an enzyme's catalytic cycle:

1. Firstly, the substrate binds to the active site of the enzyme, fitting into the active site for binding.

2. The binding of the substrate with the enzyme must be changes its shape, fitting more tightly around the substrate.

3. The newly formed enzyme-product complex is created when the active site of the enzyme, which is now near the substrate, breaks the chemical bonds of the substrate.

4. As soon as the enzyme releases the reaction's byproducts, it is free and prepared to bind to a fresh substrate molecule and repeat the catalytic cycle.

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The ka of the 2−hydroxyethylammonium ion is 3.09 * 10^-10.

We know that 2-hydroxyethylamine is a weak base that generates a conjugate acid, 2-hydroxyethylammonium ion.

[tex]HOC_{2} H_{4}NH_{2}+ H_{2}O = HOC_{2}H_{4}NH^{+}_3 + OH^{-} \\[/tex]

The pK_{b} of HOC_{2} H_{4}NH_{2} is given.

K_{b} can be solved pK_{b}.

[tex]pK_{b} = -log(x_{b}) \\K_{b} = 10^{pKb}\\ = 10^{4.49} \\K_{b} = 3.24 * 10^{-5}[/tex]

To solve of K_{a} of the reverse reaction where 2-hydroxyethylamonium ion is present, we should use this relationship

[tex]K_{w} = K_{b} * K_{a}\\K_{a} = \frac{K_{w}}{K_{b}}\\ = \frac{1.0 * 10^{-14}}{3.24 * 10^{5}} \\ K_{a} = 3.09 * 10^{-10}[/tex]

So, the ka of the 2−hydroxyethylammonium ion is 3.09 * 10^-10.

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The conversion factors given to complete the diagram of amount-mass-number relationships for a compound are

MASS (g) of substance ⇒ molar mass (g/mol) substance ⇒ AMOUNT (mol) of substance ⇒ Avogadro's number (entities/mole) ⇒  ENTITIES of substance

MASS (g) of one element in substance ⇒ molar mass (g/mol) subtance ⇒ AMOUNT (mol) of one element in substance ⇒ Avogadro's number (entities/mole) ⇒ ATOMS of one element in substance

AMOUNT (mol) of substance ⇒ molar ratio from balanced equation  ⇒ AMOUNT (mol) of one element in substance

А conversion fаctor is а number used to chаnge one set of units to аnother, by multiplying or dividing. When а conversion is necessаry, the аppropriаte conversion fаctor to аn equаl vаlue must be used. For exаmple, to convert inches to feet, the аppropriаte conversion vаlue is 12 inches equаl 1 foot. To convert minutes to hours, the аppropriаte conversion vаlue is 60 minutes equаl 1 hour.

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The most likely consequence of a molecule of ATP contains adenine, ribose, and three phosphate groups. The bond between the last two phosphates is easily broken, resulting in a molecule of ADP and one phosphate group. If the bond between the second and third phosphate groups were more stable is more energy would be required to break the bond, so the net energy produced would be less. The correct answer is B.

More energy would be needed to break the link between the second and third phosphate groups since it is more stable. Because some of the energy is used to break the stronger bond between the second and third phosphate groups, the overall amount of energy produced would be lower.

With the release of energy and inorganic phosphate, ADP (adenosine diphosphate) is easily converted to AMP (adenosine monophosphate) in cells.

ADP ⇒ AMP + Pi + energy

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Answer:

alkali metals

Explanation:

alkali metals have only 1 electron in their outer shell so it is easier to lose it

According to the research, the correct answer is Option b. A given enzyme works on one type of substrate.

It is a macromolecular substance, natural or synthetic, composed mainly of protein, which catalyzes one or more biochemical reactions in a more or less specific way.

In this sense, they act on one type of substrate, modifying its chemical properties through reactions with their own layer of amino acids, allowing the development of various cellular processes.

Therefore, we can conclude that according to the research, enzymes are characterized by helping to speed up the process of a non-catalyzed reaction and works on one type of substrate.

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Flask 3 has higher mean square value.

Flask 1 (CO) – P1 = 760 torr

Flask 2 (N2) – P2 = 250 torr

Flask 3 (H2) – P3 = 100 torr

All these have same volume and temperature

•  Average Kinetic Energy:

(K.E.) avg = 3/2 RT

(K.E.) avg ∝ T, here T = Temperature

And all the flask has same temperature

So, they all have same Kinetic Energy.

The root mean square speed (C.R.M.S.) is given by,

CRMS = √ (3RT/Mo) = √ (3PV/Mo), where Mo is the molar mass

From above CRMS ∝ √ (P/Mo)

So, higher molar mass gas molecule has lower crms.

CO = Mo = (Mo)c + (Mo)o = 12 + 16 = 28

N2 = Mo = 2(Mo)N = 2 * 14 = 28

H2 = Mo = 2(Mo)H = 2 * 1 = 2

(Mo): - H2 < N2 = CO

Hence CRMS for Flask 3 > Flask 2 > Flask 1.

So, FLASK 3 has highest CRMS

•  Rate of effusion of gas (r) is inversely proportional to square root of density (d)

r ∝ 1 / √d

r ∝ 1 / √ Mo

therefore density (d) = Mo / 2

Mo: H2 < CO = N2

r: H2 > CO = N2

Flask 3 effuses higher than flask 1 & 2.

Thus,

Flask 3 has higher mean square value.

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The change that happens to a sample of calcium carbonate as it cooled is: C. The forces strengthen, and the molecule structure becomes more rigid.

When a compound cooled down, the speed of the molecules decreases. It causes the reduction of the kinetic energy and allows the attraction between molecules to bring them closer to each other. As this process happens, the forces strengthen and cause the molecule structure to become more rigid. Hence, the correct answer is C.

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“A sample of calcium carbonate is cooled. Which change happens to the molecules of calcium carbonate in the sample?

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Answer: Answer is C

Explanation:

The type of scientific statement that describes a proven fact about how things function in nature is known as: laws.

Scientific statement is the type of statement that is potentially testable and backed up by some scientific methods (or proof). There are at least three types of scientific statements, which are as follows:

Hence, the correct answer is law.

This question seems incomplete. The complete query is as follows:

“Which type of scientific statement describes a proven fact about how things function in nature?

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Answer:

beryllium atom

Explanation:

An atom with two protons is always a helium atom. If scientists count four protons in an atom, they know it's a beryllium atom.

The freezing point of a solution of sucrose in water changes depending on the amount of sucrose in the solution.

Solution is a way to solve a problem, issue, or challenge. It is often a combination of action steps, processes, tools, or strategies that are used to address a particular issue or challenge. Solutions may be devised through brainstorming, research, or other means. Solutions can range from simple to complex, and can be tailored to the individual situation or context. Ultimately, the goal of a solution is to provide a successful outcome that resolves the issue or challenge.

Generally, the freezing point of a 1 M (molar) solution of sucrose in water is -1.86°C.

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Lewis structure for C4H4 is given below.

Lewis' structure name was given after Gilbert N. Lewis. He introduced in his article “the atom and the molecule” in 1916. Diagrams of Lewis structure shows the bonding between atoms on the molecule and also shows ion pairs of electrons if any.

A step-by-step process to draw Lewis' structure is:

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In the periodic table, when the atomic number increases, the properties of the elements repeat regularly is the true statement.

The periodic table is a table that groups all chemical elements into groups based on their unique atomic numbers. Periods and groups, respectively, are the terms used to describe the periodic table's horizontal rows and vertical columns. The present periodic chart's inventor, Henry Moseley, claimed that "the properties of elements are periodic functions of their atomic numbers." The elements' properties are characterized by periodic patterns along groups and throughout eras, as seen by the present periodic table. The elements in the periodic table are separated into four groups, or blocks. They are components of the blocks s, p, d, and f. The categorization is based on the naming of the orbitals that take the last electron.

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Volume required to completely react the 0.01 m potassium permanganate  with 0.50 g of hydrogen peroxide solution was 2.94 mL

The volume required can be calculate as follows

first we should write the balance reaction

H₂O₂ + 2KMnO₄→ 2MnO₂ + 2KOH + 2O₂

then we should calculate the moles of hydrogen peroxide (H₂O₂)

moles = mass/ molar mass

moles = 0.50 g / 34 g/ mole

moles= 0.0147 moles

we can use unitary method to calculate the moles of potassium permanganate  

moles potassium permanganate = (2/1) x  moles H₂O₂ = 2/1 x 0.0147 = 0.0294 moles

as we know the moles we can calculate the volume required

V= n/ M

V = 0.0294 moles/ 0.01 = 2.94 mL

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sp3 orbital is one of a set of hybrid orbitals produced when one s orbital and three p orbitals are combined mathematically to form four new equivalent orbitals oriented toward the corners of a regular tetrahedron. + + + merge to form.

The sp3 hybrid orbital has uneven lobes and resembles a "distorted" p orbital. The four sp3 hybrids point in the direction of a tetrahedron's four corners. If you'd like, you can watch an animation illustrating the hybridization of the C orbitals.

The process of combining the characteristics of one 2s orbital and three 2p orbitals to produce four hybrid orbitals with similar properties is known as "sp3 hybridization." An atom needs three p orbitals and a s orbital in order to be sp3 hybridised.

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Compounds can only be broken down chemically, have a fixed ratio of elements, and have a certain set of attributes.Compound particles are homogeneous, or identical, and solely of one kind.

A compound is a substance made up of two or more distinct types or elements together in a specific proportion of their atoms.

When elements combine to form compounds, powerful forces known as chemical bonds hold the components together.Chemical formulae for compounds are used to identify the elements from of the periodic table that make up each one.Because elements can rarely found on their pure form, compounds are relatively prevalent.

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Rf = Distance travelled by the substance from reference line (cm)/Distance travelled by the solvent front from reference line (cm) , the retention factor for this spot is 6.29/3.15 =1.9968.

The distribution constant is multiplied by the column's volume for stationary phase to determine the retention factor, which is then divided by the column's volume of mobile phase.

A ratio of the compound's travel distance to the solvent's travel distance is known as the Rf value.An Value of r will be low is if solvent only travels a modest distance.

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