which is krypton and why?​

The energy released when one mole of helium-4 is produced in the reaction H + H → He + H⁺ + n is approximately -3.598 × 10⁻¹² Joules per mole.

The reaction of producing one mole of helium-4 (He) from a hydrogen atom (H) and a hydrogen ion (H⁺) with the release of a neutron (n) can be represented as:

H + H → He + H⁺ + n

The energy released or absorbed in this reaction can be calculated using the mass defect method.

The mass of one mole of helium-4 (He) is approximately 4.0026 g/mol, and the mass of one mole of a hydrogen atom (H) and a hydrogen ion (H⁺) is approximately 1.0078 g/mol each. The mass of a neutron (n) is approximately 1.0087 g/mol.

Using these values, we can calculate the energy released or absorbed:

Mass of reactants = 2 × (1.0078 g/mol) = 2.0156 g/mol

Mass of products = 4.0026 g/mol + 1.0078 g/mol + 1.0087 g/mol = 6.0191 g/mol

Mass defect = Mass of reactants - Mass of products = 2.0156 g/mol - 6.0191 g/mol = -4.0035 g/mol

Energy released or absorbed (E) = Mass defect × (c²)

E = -4.0035 g/mol × (2.998 × 10⁸ m/s)²

E ≈ -3.598 × 10⁻¹² J/mol

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The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Calcium atoms will lose two electrons in order to achieve the noble gas configuration of argon. A neutral calcium atom has 20 electrons, while a calcium atom that has lost two electrons will have 18 electrons, and a neutral argon atom also has 18 electrons.

Calcium has two valence electrons in its last energy level.

It is easier to lose two electrons to adquire stability in order to achieve the noble gas configuration.

Thus, calcium will lose two electrons to get a full outer shell.

Answer:

na

Explanation:

gggggggggggggggggggggggggg

Cl (chlorine) ion is negatively charged.

form the molar concentration of the Ca(OH)2 which is a base we can deduct the pOH

pOH=-lg[OH-]

[OH-]=8.8 x 10-4 M

pOH=4

pH=14-pOH

pH=10

-lg[H+]=10

[H+]=10^-10

The concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ is 5.68×10¯¹² M

The concentration of Hydrogen ion [H⁺] in a solution talks about the acidicity  the solution. Thus, we can obtain the concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ solution as illustrated below:

Data obtained from the question

Concentration of Ca(OH)₂ = 8.8×10¯⁴ M  

Concentration of Hydrogen ion [H⁺] =..?  

Determination of the concentration of Hydroxide ion [OH¯]

 Concentration of Ca(OH)₂ = 8.8×10¯⁴ M

Concentration of Hydroxide ion [OH¯] =?  

Ca(OH)₂ (aq)⇄Ca²⁺ (aq) + 2OH¯(aq)  

From the balanced equation above,  

1 mole Ca(OH)₂ produced 2 moles of OH¯.

Therefore, 8.8×10¯⁴ M Ca(OH)₂ will produce = 8.8×10¯⁴ × 2 = 1.76×10¯³ M

Thus, the Concentration of Hydroxide ion [OH¯] is 1.76×10¯³ M  

Determination of concentration of Hydrogen ion [H⁺].  Concentration of Hydroxide ion [OH¯] = 1.76×10¯³ M

\(H^{+} * OH^{-} = 1*10^{-14}\\H^{+} * 1.76^{-3} = 1*10^{-14}\)

Divide both side by 1.76×10¯³  

\(H^{+} = \frac{1*10^{-14} }{1.76*10^{-3}}\\\)

[H⁺] = 5.68×10¯¹² M  

Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 5.68×10¯¹² M  

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To get the molar mass, we need to take the reciprocal of the number of moles per gram, which gives us 56.04 g/mol.

We can use the ideal gas law to solve for the molar mass of the gas. The ideal gas law is PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature. Rearranging this equation to solve for n/V, we get n/V = P/RT.

We can use the given information to solve for n/V. The pressure is 1520 torr, which we convert to atm by dividing by 760 torr/atm. The temperature is 290 K and the gas constant is 0.08206 Latm/(molK). Plugging in these values, we get n/V = (1520/760)/(0.08206*290) = 0.0718 mol/L.

We can use the density to solve for the mass of the gas per unit volume. The density is 2.86 g/L. Therefore, the mass of the gas per mole is 2.86 g/L * 1 L/0.0718 mol = 39.74 g/mol. However, this is the mass of the gas in grams per mole, not the molar mass. To get the molar mass, we need to take the reciprocal of the number of moles per gram, which gives us 56.04 g/mol.

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A thick layer of ice on a lake can support the weight of a person because ice is a solid state of water, while liquid water cannot support the weight due to its inherent fluidity.

Ice and liquid water are both forms of the same substance, H2O, but their molecular arrangements and physical properties differ. When water freezes, its molecules form a crystalline structure, creating a rigid network of interconnected ice molecules. This structure gives ice its solid and stable nature, allowing it to bear weight without collapsing. The lattice-like arrangement of molecules in ice makes it capable of withstanding pressure and maintaining its shape.

On the other hand, liquid water lacks a fixed molecular arrangement. The molecules in liquid water are more loosely packed and have higher mobility compared to ice. As a result, liquid water is fluid and doesn't have the structural integrity necessary to support the weight of a person or any significant load. The molecules in liquid water easily flow past each other, adapting to the shape of their container and exhibiting behaviors such as surface tension.

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Answer:

it would have caused organisms to move in search of food and better conditions.

Answer:a

Explanation:

In a chemical reaction, a conjugate acid is formed when a base gains a proton (H⁺), while a conjugate base is formed when an acid loses a proton (H⁺).

A conjugate acid-base pair consists of two species that are related to each other through the gain or loss of a proton. When an acid donates a proton, it forms its conjugate base. For example, when the acid HCl donates a proton, it forms its conjugate base, Cl⁻. Similarly, a base accepting a proton forms its conjugate acid. For instance, when ammonia (NH₃) accepts a proton, it forms its conjugate acid, NH₄⁺.

The concept of conjugate acids and bases is based on the Bronsted-Lowry theory of acids and bases, which defines acids as proton donors and bases as proton acceptors. In any acid-base reaction, the species that donates a proton is considered the acid, and the species that accepts the proton is considered the base.

Conjugate acids and bases are crucial in acid-base equilibria and buffer systems. They play a role in maintaining the pH of a solution and participating in reversible proton transfer reactions. The formation of conjugate acid-base pairs allows for the dynamic interconversion between acids and bases, enabling chemical reactions to proceed in both forward and reverse directions.

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In each pair, the solution that contains the weaker conjugate acid is more basic. Without any calculations, we can determine which solution is more basic by identifying the stronger conjugate acid in each pair.

In Part A, KClO is a stronger acid than NaF, so the solution in (b) is more basic in Part B, NaBrO is a stronger acid than NaBr, so the solution in (b) is more basic in Part C, HNO2 is a weaker acid than KOH, so the solution in (b) is more basic in Part D, NH4Cl is a weaker acid than HCN, so the solution in (a) is more basic.

It is important to note that while we did not perform any calculations, this method only works for comparing solutions with the same concentration. If the concentrations were different, we would need to perform calculations to determine which solution is more basic. A

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Answer: 1.86*10^-7M

Explanation:

Answer:

B. 1.86 x 10^-7 M

Explanation:

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question we have

\(volume = \frac{1000}{13.6} \\ = 73.52941...\)

We have the final answer as

Hope this helps you

The question is incomplete but i will try to offer as much help as i can.

Answer:

See explanation

Explanation:

The electron was discovered by J.J Thompson. His model of the atom was called the plum-pudding model of the atom.

He discovered that cathode rays being negatively charged particles were deflected by a magnet in just the same way as moving, negative electrically charged particles.

Similarly, in an electric field, they are deflected towards the positive plate of the electrostatic field which shows that they are negatively charged.

This reaction is often carried out in the presence of a strong acid, such as H2SO4, to facilitate the protonation of the alcohol. To accomplish each of the given transformations, you would use the following reagents:

1. Na2Cr2O7 and H2SO4: These reagents are commonly used in the oxidation of alcohols to aldehydes or ketones. Specifically, Na2Cr2O7 is a strong oxidizing agent that can convert primary alcohols to aldehydes and secondary alcohols to ketones. However, in order to achieve this transformation, the reaction must be carried out in the presence of an acid catalyst, such as H2SO4.

2. Br2 and H2O: These reagents are used in the addition of halogens to alkenes. Specifically, Br2 is a halogen that can be added to an alkene to form a dihalide. This reaction is often carried out in the presence of water (H2O) to help solubilize the reagents and facilitate the reaction.

3. [H3O+]: This reagent is commonly used in acid-catalyzed reactions, such as the dehydration of alcohols. Specifically, [H3O+] can protonate the hydroxyl group of an alcohol to form an oxonium ion, which can then undergo elimination to form an alkene.

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A reaction to be spontaneous,overall cell potential must be positive.

(A)The metabolite which would spontaneously reduce oxaloacetate (OAA) is:

alpha-ketoglutarate

(B)The two half cell reactions are as follows:

Reduction half reaction:

Oxaloacetate + 2 H+ + 2 e- --> malate

Oxidation half reaction:

alpha-ketoglutarate --> Succinate + CO2 + 2 H+ + 2 e-

Overall resulting balanced reaction for the reduction of OAA :

Oxaloacetate +alpha-ketoglutarate --> malate + Succinate + CO2

(C)the standard reduction potential for the reaction chosen in (B):

+0.67-0.17 = +0.50 V

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Answer:  2.25 moles of C, 40.6 grams of Sb, 77%, and

Answer: 2.25 moles of C

Explanation: To answer this question, we need to use a mole ratio, which is a stoichiometric relationship between the amounts in moles of any two substances in a chemical reaction. The balanced equation for the reaction is:

\ce {C} (s) + \ce {O2} (g) \rightarrow \ce {CO} (g) + \ce {CO2} (g) C(s) + OX 2(g) → CO(g) + COX 2(g)

The mole ratio between C and CO is 1:1, which means that for every mole of C that reacts, one mole of CO is produced. Therefore, to produce 4.5 moles of CO, we need 4.5 moles of C.

Answer: 40.6 grams of Sb

Explanation: To answer this question, we need to use composition stoichiometry, which is the calculation of quantities by weight in a reaction described by a balanced equation. The balanced equation for the reaction is:

\ce {Sb2O3} (s) + \ce {C} (s) \rightarrow \ce {Sb} (s) + \ce {CO} (g) SbX 2OX 3(s) + C(s) → Sb(s) + CO(g)

To find the mass of Sb produced from a given mass of SbX 2OX 3, we need to convert the mass of SbX 2OX 3 to moles using its molar mass, then use the mole ratio between SbX 2OX 3 and Sb to find the moles of Sb produced, and then convert the moles of Sb to mass using its molar mass. The molar masses of SbX 2OX 3 and Sb are 291.5 g/mol and 121.8 g/mol, respectively. The mole ratio between SbX 2OX 3 and Sb is 1:2, which means that for every mole of SbX 2OX 3 that reacts, two moles of Sb are produced.

Answer: 77%

Explanation: To answer this question, we need to use the concept of percent yield, which is the ratio of the actual yield (the amount of product obtained from a reaction) to the theoretical yield (the maximum amount of product that can be obtained from a reaction) expressed as a percentage. The balanced equation for the reaction is:

\ce {Sb2O3} (s) + \ce {C} (s) \rightarrow \ce {Sb} (s) + \ce {CO} (g) SbX 2OX 3(s) + C(s) → Sb(s) + CO(g)

Answer: C is the limiting reagent

Explanation: To answer this question, we need to use the concept of limiting reagent, which is the reactant that is completely used up in a reaction and thus determines when the reaction stops. The balanced equation for the reaction is:

\ce {Sb2O3} (s) + \ce {C} (s) \rightarrow \ce {Sb} (s) + \ce {CO} (g) SbX 2OX 3(s) + C(s) → Sb(s) + CO(g)

To find the limiting reagent, we need to compare the amounts of SbX 2OX 3 and C in moles and use the mole ratio between them from the balanced equation. The mole ratio between SbX 2OX 3 and C is 1:1, which means that for every mole of SbX 2OX 3 that reacts, one mole of C is needed. Therefore, if we have more moles of one reactant than the other, that reactant is in excess and the other one is limiting. To find the moles of SbX 2OX 3 and C, we need to use their molar masses. The molar masses of SbX 2OX 3 and C are 291.5 g/mol and 12.0 g/mol, respectively.

Since we have more moles of C than SbX 2OX 3, C is in excess and SbX 2OX 3 is limiting. However, another way to find the limiting reagent is to use a formula based on the mole ratio:

Limiting Reagent Formula

Since 0.213 < 2.75, SbX 2OX 3 is the limiting reagent.

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Length x width x height can define the volume of an object.

Volume can be defined as the space which is occupied by an object in space. It is also called the capacity of the object. The volume of an object also refers to the amount of space it fills. Very large Volumes can be measured in cubic meters (m3) while the other hand, while the Smaller volumes can be measured in cubic centimeters (cm3) as well as cubic millimeters (mm3). Volume has three dimensions i.e. length, width, and height whereas area has two dimensions i.e. length and width. We can calculate the volume of an object with the help of a formula i.e. Volume = length × width × height.

So we can conclude that volume of an object can be calculated with the help of the formula i.e. Volume = length × width × height.

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Answer: 1.215 × 10^4  i think

Explanation:

Answer:

Crisscross method is simply writing the charges crossly near each element. Since oxidation number of Mg (metal) is +2 and oxygen (nonmetal) is -2, if we cross them and write next to each; we get Mg2O2 .

Answer:

At this point the volume of the gas is halved. If the pressure on the piston is again doubled, the volume of gas decreases to one-fourth its original volume. FIGURE 9.8 Boyle's Law: At constant temperature, the volume of a gas sample is inversely proportional to the pressure.

The volume of the gas doubles.

Boyles law state that the pressure of a gas is indirectly proportional to the volume at constant temperature. It is given by:

PV = constant

Let us assume that initially the pressure is P and the volume is V, hence:

\(P_1=P,V_1=V\)

The volume decreases to half its original value, hence:

\(P_2=\frac{P}{2}\)

Therefore:

\(P_1V_1=P_2V_2\\\\\\PV=\frac{P}{2}V_2\\\\V_2=2V\)

Therefore the volume of the gas doubles.

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Answer:

Answer is A. Ethyl.........

Answer:

D. ethane

Explanation:

Answer:

Physicians do not have to treat every ill patient. However they must uphold their ethics (eg. do no harm, confidentiatlity, etc.).

Explanation:

Primary source:

Hippocratic Oath (translation since it's originally in Greek)

I swear by Apollo the physician, and Asclepius, and Hygieia and Panacea and all the gods and goddesses as my witnesses, that, according to my ability and judgement, I will keep this Oath and this contract:

To hold him who taught me this art equally dear to me as my parents, to be a partner in life with him, and to fulfill his needs when required; to look upon his offspring as equals to my own siblings, and to teach them this art, if they shall wish to learn it, without fee or contract; and that by the set rules, lectures, and every other mode of instruction, I will impart a knowledge of the art to my own sons, and those of my teachers, and to students bound by this contract and having sworn this Oath to the law of medicine, but to no others.

I will use those dietary regimens which will benefit my patients according to my greatest ability and judgement, and I will do no harm or injustice to them.

I will not give a lethal drug to anyone if I am asked, nor will I advise such a plan; and similarly I will not give a woman a pessary to cause an abortion.

In purity and according to divine law will I carry out my life and my art.

I will not use the knife, even upon those suffering from stones, but I will leave this to those who are trained in this craft.

Into whatever homes I go, I will enter them for the benefit of the sick, avoiding any voluntary act of impropriety or corruption, including the seduction of women or men, whether they are free men or slaves.

Whatever I see or hear in the lives of my patients, whether in connection with my professional practice or not, which ought not to be spoken of outside, I will keep secret, as considering all such things to be private.

So long as I maintain this Oath faithfully and without corruption, may it be granted to me to partake of life fully and the practice of my art, gaining the respect of all men for all time. However, should I transgress this Oath and violate it, may the opposite be my fate.

Answer:

Hydrogen may be used in fuel cells for local electricity generation or potentially as a transportation fuel. Hydrogen is produced as a by-product of industrial chlorine production by electrolysis.

Answer:

Ummm haven't learneed it yet

Explanation:

Ca(OH)₂⇒ Ca²⁺ + 2OH⁻

s                 s         2s

Ksp = [Ca²⁺][OH⁻]²

Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻

0.1 M             0.1        0.2

Input in Ksp

1.3 x 10⁻⁶ = 0.1 . 4s²

s² = 3.25 x 10⁻⁶

s = 1.8 x 10⁻³

1.8 x 10⁻³ is the molar solubility. Solubility is the amount of a substance that can be dissolved in a liquid to form a solution.

Solubility is the amount of a substance that can be dissolved in a liquid to form a solution; it is typically represented as grammes of solute every litre of liquid. One fluid's (liquid or gas) solubility in another can be entire (e.g., methanol and water are completely miscible) or partial (e.g., oil and water barely mix). Generally speaking, "like dissolves like" (for instance, the aromatic hydrocarbons dissolves in one another but not in water).

A material's solubility in two solvents is measured by the distribution coefficient, which is used in some separation techniques (such as absorption and extraction). In general, as temperature rises, so do the dissolution rates of solids in liquids, while they fall as temperature rises and rise with pressure for gases.

Ca(OH)₂⇒ Ca²⁺ + 2OH⁻

s                 s         2s

Ksp = [Ca²⁺][OH⁻]²

Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻

0.1 M             0.1        0.2

1.3 x 10⁻⁶ = 0.1 . 4s²

s² = 3.25 x 10⁻⁶

s = 1.8 x 10⁻³

Therefore, 1.8 x 10⁻³ is the molar solubility.

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Answer:

129 units cubed

Explanation:

There are ten spaces between 120 and 130, so we can infer that each line represents a change in volume of 1 unit. The volume of the substance in the graduated cylinder looks like it's 1 under 130, so its volume is 129 units.

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When antacid reacts with HCl to produce H2CO3 it produce fizzy gas react due to a double displacement reaction.

Table salt and carbonic acid are produced in a two fold displacement process when hydrochloric acid and antacid are combined. Additionally, due to the instability of carbonic acid, it will decompose into water and carbon dioxide, emitting a "fizzy" gas.

Strong acid hydrochloric acid is denoted by the chemical formula HCl. The primary ingredient in antacids is sodium bicarbonate, sometimes known as baking soda and has the chemical formula NaHCO3.

Antacid undergoes a chemical reaction when it reacts as a carbonate with powerful acids like hydrochloric acid to create compounds with a different chemical makeup from the beginning components. Similar reactions will be produced by other carbonates, such as calcium carbonate, which makes up the majority of Tums.

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Electrophilic addition reaction produces bromopropylbenzene with molecular formula C10H13Br.The reaction of p-cymene with N-bromosuccinimide (NBS) is an example of an electrophilic addition reaction, where the NBS acts as a source of electrophilic bromine and succinimide acts as a radical scavenger. The final product is bromopropylbenzene, which has a molecular formula of C10H13Br and a structure of C10H13Br.

Under the specified circumstances, p-cymene reacts with N-bromosuccinimide (NBS), and one of its hydrogen atoms is changed to a bromine atom. The Hock rearrangement is a radical mechanism that drives this substitution reaction. 1-Bromo-p-cymene is the main byproduct generated. The product has the chemical formula C10H13Br. The aromatic ring of p-cymene gains a halogen substituent when the bromine atom is joined to one of the carbon atoms. This process is frequently used to selectively bromine aromatic molecules.

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When p-cymene reacts with N-bromosuccinimide, the major product formed is 1-bromo-2-isopropyl-5-methylbenzene with molecular formula C10H13Br.

P-cymene is a colorless liquid with a sweet odor that has an odor similar to turpentine. It has a melting point of -75 °C and a boiling point of 177 °C. It is used as a food flavoring agent and in the production of plastics, resins, and as a solvent.

N-bromosuccinimide (NBS) is a white crystalline solid that is widely used as a brominating agent in organic synthesis. It is used as a radical initiator and a mild brominating agent, and its use avoids the addition of toxic bromine to organic compounds. Under mild conditions, NBS reacts with allylic and benzylic hydrogen atoms to form the corresponding bromohydrins and bromides.

In the presence of light, N-bromosuccinimide reacts with p-cymene to produce a single product, which is 1-bromo-2-isopropyl-5-methylbenzene with a molecular formula C10H13Br.

The reaction can be represented as shown below; The major product formed in the reaction of p-cymene with N-bromosuccinimide under the conditions shown is 1-bromo-2-isopropyl-5-methylbenzene with a molecular formula of C10H13Br.

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Answer:

law of independent assortment