The product of the nuclear reaction in which 28Si is subjected to neutron capture followed by alpha emission is ________.
A) 31S
B) 33S
C) 23Mg
D) 25Mg
E) 25Al

Answer:

1 mole

Explanation:

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Among the given quantities, the greatest mass of chlorine is represented by one molecule of chlorine Cl₂ that is equal to 71 grams.

A molecule of an element is formed by the combination of two atoms of that element. One mole of an element is the amount containing 6.022 × 10²³ atoms. This s number is called Avogadro number.

The mass of one mole of an element is called its atomic mass. Cl is 17th element. Atomic mass of Cl = 35.5 g

35.5 g of Cl is called one mole of Cl containing Avogadro number of atoms.

One molecule of Cl is represented as Cl₂ with the mass = 35.5 × 2 = 71 g.

This is the molecular mass of Cl.

One gram of Cl is small amount and mass of one atom of Cl is even smaller. Thus, one molecules of Cl represents the greater mass here. Hence, option D is correct.

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A=20

B=40

C=Ca

D=10

E=9

F=F

The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.

So atomic number = number of protons = number of electrons

Mass Number (A) is the sum of protons and neutrons

Mass Number (A) = Number of protons + Number of Neutrons

So that the relationship between atomic numbers and mass numbers can be formulated as follows:

Atomic Number (Z) = Mass Number (A) - Number of Neutrons

A=atomic number=number of protons=20

B=mass number=protons+neutrons=20+20=40

C=the element with atomic number 20 and mass number 40 is Ca,

\(\tt _{20}^{40}Ca\)

D=number of neutrons=mass number-number of protons =19-9=10

E=atomic number=number of protons=9

F=the element with atomic number 9 and mass number 19 is F

\(\tt _9^{19}F\)

Answer:

phosphorous(iii) oxide

Explanation:

Hope this helps! :)

Density = mass/volume

 ρ = \(m/v\)

 Density = 10/3.70

 Density of aluminum 2.702 g/cm3.

A thin, silvery-white metal, aluminum is. It is soft and pliable. Aluminum is used in a wide variety of products, including cans, foil, kitchenware, window frames, beer kegs, and parts for airplanes.

In the Earth's crust, aluminum is the most prevalent metal and the third most abundant element. On Earth, it is typically found in substances and minerals such feldspar, beryl, cryolite, and turquoise. But mining minerals for aluminum is quite expensive.

Rust doesn't occur in aluminum. It's important to remember, though, that aluminum is a highly reactive metal in its purest form. Although pure aluminum technically dissolves when it comes into contact with water, its reactivity may also be its greatest strength.

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The question is incomplete, the complete question is;

Arrange the following ionic compounds in order of decreasing amount of energy released in lattice formation: NaF, MgS, TlN, and CsI.

Answer:

TlN> MgS > NaF > CsI

Explanation:

Recall that lattice energy is the energy evolved when a crystal lattice is formed from its component ions.

The lattice energy depends on the size of the ions. The smaller the sizes of the ions, the larger the lattice energy.

The order of energy released in lattice formation for these compounds is;

TlN> MgS > NaF > CsI

3 is the bond order of CO group. Option d is correct alternative.

A bond order is a measure of the number of chemical bonds between two atoms in a molecule. In a molecule, the bond order is calculated by 1/2 *(numbers of electron in bonding - number of electron antibonding)

In the case of CO, the carbon atom forms a triple bond with the oxygen atom.

Considering, the molecular orbital electronic configuration of CO molecule,

here number of electron bonding is 10

number of electron antibonding is 4

so the bond order is = (10-4)*1/2= 3

So the bond order of CO molecule is 3.

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The statement that is a characteristic of water is strong cohesion. Details about characteristics of water can be found below.

Water is a unique molecule which is attributed to its unique characteristics or features.

Water is made up of two hydrogen atoms and one oxygen atom that are chemically bonded to one another.

Some of the characteristics of water are as follows:

Therefore, the statement that is a characteristic of water is strong cohesion.

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Answer:

B

CuO

H2

Explanation:

hydrogen will oxidized to form water

Copper(II) oxide reacts with hydrogen.

\(CuO + H_2\) → \(Cu + H_2O\)

Oxidising agent - \(Cuo\)

Reducing agent - \(H_2\)

A chemical reaction that takes place between an oxidizing substance and a reducing substance.

The oxidizing substance loses electrons in the reaction, and the reducing substance gains electrons.

In the reaction  \(CuO + H_2\) → \(Cu + H_2O\)  

\(Cuo\) is the oxidising agent and  \(H_2\) is the reducing agent because \(Cuo\)  is oxidising  \(H_2\) and \(H_2\) is the reducing agent because it is removing oxygen from \(Cuo\).

Hence, option B is correct.

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After benzocaine is mixed with hydrochloric acid, it will be 4-aminobenzoic acid and soluble in the water.

Benzocaine, sold beneath the counter emblem called Orajel amongst over-the-counters, is an ester nearby ones over the counter normally used as a topical ache reliever or in cough drops. it's a far over-the-counter lively factor in many ones over counter ointments consisting of merchandise for oral ulcers.

Benzocaine is used to relieve aches and itching resulting from conditions that include sunburn or different minor burns, insect bites or stings, poison ivy, poison oak, poison sumac, minor cuts, or scratches.

Benzocaine is a local over-the-counter used in pain manage management, and it's far over-the-counter ester neighborhood ones over-the-counter elegance of medication. This pastime describes over-the-counter symptoms, actions, and contraindications for benzocaine as a valuable agent in coping with ache control.

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Answer:This is a Flint lighter, It's usually used to make sparks to light things like burners in chemistry.

Explanation:

The concentration of NaOH solution that requires 37.96 mL of NaOH to titrate 0.702 g of KHP is 0.0896 M.

To calculate the concentration of the NaOH solution which requires 37.96 mL of NaOH to titrate 0.702 g of KHP, we first need to know the balanced equation of the reaction between NaOH and KHP.

The balanced equation is as follows:

NaOH(aq) + KHC₈H₄O₄(aq) = KNaC₈H₄O₄(aq) + H₂O(l)

According to the equation, one mole of NaOH reacts with one mole of KHP (potassium hydrogen phthalate) to produce one mole of NaKC₈H₄O₄ (sodium hydrogen phthalate) and one mole of H2O (water).

Thus, the mole of NaOH required to titrate KHP is:

Mole of NaOH = (mass of KHP) / (molar mass of KHP)

Molar mass of KHP = 204.22 g/mol (mass of KHP is given as 0.702 g)

Mole of NaOH = 0.702 g / 204.22 g/mol = 0.0034 mol NaOH

The volume of NaOH is also given as 37.96 mL. But we need to convert it to liter.

Liters of NaOH = 37.96 mL / 1000 mL/L = 0.03796 L

Concentration (M) of NaOH can be calculated by dividing the number of moles of NaOH by the volume of NaOH in

.

Concentration (M) of NaOH = 0.0034 mol NaOH / 0.03796 L

NaOH = 0.0896 M

Therefore, the concentration of NaOH solution that requires 37.96 mL of NaOH to titrate 0.702 g of KHP is 0.0896 M.

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₀n¹ -----------> ₁H¹ + ₋₁e⁰ + ν + q, Beta decay converts a neutron to a proton and emits an excessive-energy electron, producing a daughter nucleus with an equal mass.

Number as the parent and an atomic number that is higher by means of 1. Positron emission is the alternative to beta decay and converts a proton to a neutron plus a positron.

Two numbers are connected to the image. The variety on the upper right is the mass range, also referred to as the 'A' range. The 'A' wide variety describes the atomic weight of the atom and identifies the number of protons and neutrons within the nucleus.

In positron emission, additionally referred to as high-quality beta decay β+-decay, a proton within the determined nucleus decays right into a neutron that remains in the daughter nucleus, and the nucleus emits a neutrino and a positron, which is an advantageous particle like a regular electron in mass but of opposite price.

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When H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases (option C)

A French scientist (Chatelier) postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states that If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

According to Chatelier's principle a decrease in concentration of the products will favor the forward (right) reaction.

From the above principle, we can conclude that when H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases.

Thus, the correct answer to the question is option C

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The complete chemical equation for cellular respiration is:

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy

In this equation, glucose (C₆H₁₂O₆) is combined with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O). The process of cellular respiration occurs in the mitochondria of cells and involves the breakdown of glucose to release energy in the form of ATP (adenosine triphosphate).

During cellular respiration, glucose is oxidized to form carbon dioxide, and oxygen is reduced to form water. This process releases energy that is stored in ATP molecules and is used by cells to carry out various metabolic activities.

Overall, cellular respiration is a vital process in organisms to generate energy for cellular functions and is essential for the survival and functioning of living organisms.

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The Ni2+ ion in the complex K3[Ni(CN)5] has 6 d-electrons associated with the central metal ion.

In the complex K3[Ni(CN)5], the central metal ion is Ni (nickel). To determine the number of d-electrons associated with the central metal ion, we first need to identify the oxidation state of nickel in this complex.
The overall charge of the complex ion is -3, since there are 3 potassium ions (K+) each with a +1 charge. The five cyanide ligands (CN-) each have a -1 charge, contributing a total charge of -5 from the ligands. Therefore, the oxidation state of Ni in the complex is +2 (since -3 = -5 + oxidation state of Ni).
Nickel has an atomic number of 28, with the electron configuration [Ar] 3d8 4s2. In the Ni2+ ion, two electrons are removed, resulting in the electron configuration [Ar] 3d8-2 4s0, which simplifies to [Ar] 3d6. Therefore, the Ni2+ ion in the complex K3[Ni(CN)5] has 6 d-electrons associated with the central metal ion.

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The major organic product is 2-ethylbutan-2-ol (C₅H₁₂O):

CH₃CH₂CO₂CH₂CH₃ + NaOEt --> CH₃CH₂CO₂CH(CH₃)CH₃

CH₃CH₂CO₂CH(CH₃)CH₃ + H₂O --> 2-Ethylbutan-2-ol + Na⁺ + OH⁻

With very few exceptions, chemicals, regardless of their source, are classified as organic if they contain at least one carbon atom. For this reason, organic chemistry is called "the chemistry of carbon". Generally, this carbon atom is bonded to at least one hydrogen atom.

The basic types of reactions in organic chemistry are addition reactions, elimination reactions, substitution reactions, pericyclic reactions, rearrangement reactions, photochemical reactions, and redox reactions. Organic synthesis uses organic reactions to build new organic molecules.

Examples of organic compounds are carbohydrates, fats (lipids), proteins and nucleic acids, which are the building blocks of the molecules of life.

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(a)The pH of the fruit juice solution is approximately 3.5. (b) The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(b)The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(a). The hydrogen ion concentration of the fruit juice is 0.0003 mol/L. We can determine the pH of the solution using the formula pH = -log[H⁺].

pH = -log(0.0003)

pH ≈ -log(3 × 10⁻⁴)

Using a calculator, we can calculate the logarithm:

pH ≈ -(-3.5229) (rounded to the nearest tenth)

pH ≈ 3.5

Therefore, the pH of the fruit juice solution is approximately 3.5.

(b). A tomato has a pH of 3.0. We can determine the hydrogen ion concentration of this solution by rearranging the formula pH = -log[H⁺] to solve for [H⁺].

[H⁺] = 10(-pH)

[H⁺] = 10⁻³

[H⁺] = 0.001 mol/L

Therefore, the hydrogen ion concentration of the tomato solution is 0.001 mol/L.

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Answer:

A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.

Explanation:

Answer:

Explanation:es porque las especies con nichos idénticos tienen las mismas necesidades, lo que significa que competirían exactamente por los mismos recursos.

The average atomic mass of lead is 206.819 amu

Let the 1st isotope be A

Let the 2nd isotope be B

Let the 3rd isotope be C

From the question given above, the following data were obtained:

Abundance of A (A%) = 23.5%

Mass of A = 204 amu

Abundance of B (B%) = 24.1%

Mass of B = 207 amu

Abundance of C (C%) = 52.4%

Mass of C = 208 amu

The average atomic mass of lead can be obtained as follow:

= [(204 × 23.5)/100] + [(207 × 24.1)/100] +  [(208 × 52.4)/100]

= 47.94 + 49.887 + 108.992

Therefore, the average atomic mass of lead is 206.819 amu

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The net charge on the sulfur atom is -0.3 μC.

We must know that an atom is composed of electrons, protons and neutrons. Th electrons are found in the orbits, the protons are found in the nucleus along with the protons. We could add a net charge to the electron by adding or removing an electron from it.

Now we are trying to obtain the net charge, in coulombs, would you place on it if you put an extra electron on 1 in 10^12 of its atoms.

We have;

1 electron/ 1 * 10^12 * -(1.6 * 10^-19)/ 1 electron * 100g * 1 mol/32 g/mol * 6.02 * 10^23 atoms/mol

= -0.3 μC

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Missing parts;

What net charge would you place on a 100 g piece of sulfur if you put an extra electron on 1 in 1012 of its atoms? (Sulfur has an atomic mass of 32.1.)

Answer:

sp³-s sigma bond.

Hope that was the answer

Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.

A balanced reaction is one where the reactants and products are present in equal amounts, and if the 100% reaction takes place, then the reactant sides have 1 mol of SbF₃ and 3 mol of CCl₄ that make the product of 1 mol of SbCl₃ and 3 mol of CClF₂. After the 100% reaction, all the reactants get converted into the product. The complete reaction is the below.

SbF₃ + 3CCl₄ → SbCl₃ + 3CClF₂

Hence, suppose  5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.

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This increased energy causes the molecules to move more rapidly, which in turn increases the volume of the substance. As the volume of the substance increases, its density decreases because the same amount of matter is spread out over a larger volume.

The density decreases as the temperature increases because the molecules lose energy and slow down, so the same number of molecules occupy less space. This happens because the increase in temperature causes the molecules to move more rapidly, increasing the space between them. The density of a substance is defined as its mass per unit volume. The density of a substance depends on its temperature, as well as its pressure and composition. As the temperature of a substance increases, the kinetic energy of its molecules also increases. This increased energy causes the molecules to move more rapidly, which in turn increases the volume of the substance. As the volume of the substance increases, its density decreases because the same amount of matter is spread out over a larger volume.

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Cis- and trans-2-butene can both be hydrogenated to butane; thus their energies can be compared. the trans isomer releases less energy upon hydrogenation therefore cis-2-butene higher in energy.

The process of addition of hydrogen atom to another compound in the presence of catalyst such as nickel, cobalt etc. is termed as hydrogenation process.

As in trans- isomer, similar atoms or group of atoms are on opposite side. Due to which there is less repulsion between the atoms which results in more stability of trans isomer. On the other hand in cis- isomer, similar atoms or group of atoms are on same side, due to which there is more repulsion between the atoms which results in less stability of cis-isomer.

Due to more stability of trans- isomer less energy is released to add hydrogen to the trans butene as compared to cis butene for the formation of butane.

Thus we concluded that the trans isomer releases less energy than cis isomer in hydrogenation process.

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In the first structure, the red methyl substituent (CH3) is in the equatorial position.

In the second structure, the red methyl substituent is in the axial position.

In the third structure, the red methyl substituent is in the trans-3 position.

In the fourth structure, the red methyl substituent is in the axial position.

In the fifth structure, the red methyl substituent is in the equatorial position.

In cyclohexane, the ring flip can change the position of the substituents from axial to equatorial and vice versa. The stability of the cyclohexane conformation depends on the position of the substituents, the equatorial position is more stable than the axial position due to fewer steric interactions. In the given structures, the red methyl substituents are in different positions, and the position is described as axial or equatorial.

The position of the substituents in cyclohexane can be trans or cis, and it affects the stability of the conformation.

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0.54 g of K2SO4 will crystallize when the solution is cooled to 0 degree celsius.

Weight of KNO3= 51 g

Weight of K2SO4= 9 g

Weight of Water= 130 g

When the mixture is added to water, we get a solution.

Now, the solution is cooled to 0 °C.

Therefore, the solubility of KNO3 and K2SO4 decreases at this temperature, and they start to crystallize.

In other words, KNO3 and K2SO4 will start to crystallize at 0 °C, and the solubility of these salts at this temperature is given in the table below;

Substance Solubility at 0°C (g/100 g H2O)

KNO3 10.6

K2SO 41.8

Let's calculate the mass of K2SO4 that will crystallize.

The mass of the remaining K2SO4 in the solution will be the initial mass minus the mass of K2SO4 that crystallizes.

mass of K2SO4 = initial mass - mass of K2SO4 that crystallizes

mass of K2SO4 = 9 - mass of K2SO4 that crystallizes

We know that the mass of KNO3 in the solution is 51 g, and its solubility at 0 °C is 10.6 g/100 g of water.

Therefore, the amount of KNO3 that crystallizes will be;

KNO3 that crystallizes = 51 - (130/100) × 10.6

KNO3 that crystallizes = 51 - 13.78

KNO3 that crystallizes = 37.22 g

The mass of the remaining solution after crystallization of KNO3 is;

mass of the remaining solution = 130 - 100

mass of the remaining solution = 30 g

Now, using the amount of solution that is left, we can calculate the mass of K2SO4 that will crystallize.

Mass of K2SO4 that crystallizes = solubility of K2SO4 x Mass of water

Mass of K2SO4 that crystallizes = 1.8 g/100 g x 30 g

Mass of K2SO4 that crystallizes = 0.54 g

Therefore, 0.54 g of K2SO4 will crystallize.

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Answer:

The tilt of the Earth's axis also defines the length of daylight.Daylight hours are shortest in each hemisphere winter. Between summer and winter

solistice the number of daylight hours decreases and the rate of decrease is larger the higher the latitude.The fewer sunlight hours the colder nights.

Answer:

Tundra are cold bioms. They include poler bears wolfs rabbits etc

Explanation: