Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sample contains 0.30 g of X and the other contains 0.39 g of X. Identify plausible sets of formulas for these two
compounds.
XY and X3Y
X3Y and X4Y
XY3 and XY4
X2Y and X3Y
X4Y2 and X3Y
X2Y5 and X3Y5
XY and X2Y

Answer:

If it is tested in a controlled setting with repeated results.

Explanation:

Hello,

Every scientific foundation is preceded by a series of repetitive tests which allow the scientists to state both reliable and trustful conclusions. In such a way, by repeating the aforesaid test, the conclusion is strengthened, nevertheless, those tests must be carried out in a controlled manner in order to assure that the proposed conclusion is suitable under the specified conditions for scientific claims.

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Let us check each molecule

a) HCl : the number of shared electron pairs is "one"

the number of unshared electron pairs is six [on chlorine]

b) H₂S : the number of shared electron pairs is "two" as there are two bonds of sulphur with two hydrogen atoms.

The number of valence electrons on sulphur are six, out of these two are involved in bonding and rest four are in the form of two unshared (lone pair) pair of electrons

So in H₂S it has the same number of shared electron pairs as unshared electron pairs

c) PF₃ : the shared pair of electrons are "three"

the number of unshared electron pairs is one on phosphorous.

d) CCl₂F₂ : there are total four shared pair of electrons on carbon and zero unshared electron pairs

e) Br₂ : only one shared electron pair and three unshared electron pairs

The molecule that has the same number of shared electron pairs as unshared electron pairs is H2S.

In a molecule, chemical bonds are formed when atoms share electrons. However, some atoms have unshared electron pairs on their valence shells. These unshared electron pairs are called lone pairs and are localized on one of the atoms in the bond.

In the molecule H2S. There are two lone pairs or unshared pairs on sulfur and there are two shared pairs of electrons in the molecule. Hence the molecule that has the same number of shared electron pairs as unshared electron pairs is H2S.

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A. The formula for Keq is:

Keq = concentration of product [B] / concentration of reactant [A]

where

A = 3 B

Therefore Keq is:

Keq = [B] / [3 B]

Keq = 0.33

B. The formula for ΔG° is:

ΔG° = - R T ln(Keq)

Since Keq is 0.33 and ln Keq = - 1.1, therefore:

ΔG° = - R T (- 1.1)

ΔG° = +

Therefore ΔG° is positive

The value of Keq for the unimolecular reaction with three times as much starting material as product at equilibrium is 1.73. The value of ∆G° is positive.

In a unimolecular reaction with three times as much starting material as product at equilibrium, the value of Keq can be calculated by taking the square root of the concentration ratio of product to reactant. Since there is three times as much starting material as product, the concentration ratio is 3:1. Taking the square root of this ratio gives us a Keq value of 1.73 (rounded to two decimal places).

The value of ΔG° for a reaction can determine whether it is spontaneous or non-spontaneous. If ΔG° is negative, the reaction is spontaneous and can proceed without any outside intervention. If ΔG° is positive, the reaction is non-spontaneous and requires an input of energy to proceed. In this case, since the reaction is at equilibrium and there is three times as much reactant, the value of ΔG° would be positive.

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Answer:

D. the splitting of the atomic nucleus into parts

D.The electric force and nuclear forces are in opposition to each other.

Explanation:

To determine the mole percent of CO2 in a stream of mixed gases, one would first calculate the moles of each gas. The mole percent of CO2 in this case can be calculated as approximately 73%.

The mole percent of CO2 in the product stream can be calculated by determining the number of mols of each gas and then using these values to calculate the mole fractions. First, we need to calculate the number of mols for air and CO2 separately.

Initial air is given as 10.0 kg/h, and it is composed of 21 moles% O2 and the rest is N2. Given that the molar mass of O2 is approximately 32 g/mol and N2 is approximately 28 g/mol, this gives us a total of approximately 0.289 moles of air per second. Next, the number of moles of CO2 entering the mixer can be calculated using the ideal gas law formula PV=nRT. Assuming standard pressure for this equation, we get approximately 0.784 moles of CO2 per second.

Finally, the mole percent of CO2 in the product could be calculated as the number of moles of CO2 divided by the total number of moles (number of moles of CO2 + number of moles of air) multiplied by 100. Plugging in the values gives us approximately 73% mole percent of CO2 in the product.

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Answer:

s atomic orbital

Explanation:

Lets us consider 4s, 4p, 4d and 4f. Here 4 is the energy level or the principal quantum number. For all the atomic orbital s, p, d and f the energy level is the same. But the energy level of each  

Atomic orbital is different. s atomic orbital has the lowest energy followed by p, d and f.  

Arranging the atomic orbitals in order of increasing energy:

s < p < d < f

Answer: The final volume should be [tex]\frac{V_1}{2}[/tex]

Explanation:

To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.  

The equation given by this law is:

[tex]P_1V_1=P_2V_2[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas= P atm

[tex]V_1[/tex] =  initial volume of gas = [tex]V_1[/tex]

[tex]P_2[/tex] = final pressure of gas= 2P

[tex]V_2[/tex] = final volume of gas = ?

Putting values in above equation, we get:

[tex]P\times V_1=2P\times V_2[/tex]

[tex]V_2=\frac{V_1}{2}[/tex]

Thus the final volume should be [tex]\frac{V_1}{2}[/tex]

The balanced chemical equation  between sodium lithium metal and diatomic nitrogen gas is given by;

6Li(s) + N2(g) → 2Li3N(s)

Keywords: Chemical equations, balancing of chemical equations

Level: high school

Subject: Chemistry

Topic: Chemical equations

Sub-topic: Balancing chemical equations  

The balanced chemical equation for the reaction between lithium metal and nitrogen gas to form lithium nitride is 6 Li (s) + N₂ (g) → 2 Li₃N (s). This reaction is exothermic.

The reaction between solid lithium metal and diatomic nitrogen gas produces lithium nitride.

The balanced chemical equation for this reaction is as follows:

This reaction is exothermic, meaning it releases heat.

Correct question is: Solid lithium metal and diatomic nitrogen gas react spontaneously to form a solid product. give the balanced chemical equation (including phases) that describes this reaction. indicate the phases using abbreviation (s), (I), (g) for solid, liquid and gas

  Mg  + Fe2O3→ Fe  +mgO  

The  coefficients needed to balance the reaction above is  3, 1,2,3  

the  reaction  is a single  replacement reaction/ single displacement  reaction

 The balanced  equation is is therefore

 = 3Mg + Fe2O3 → 2Fe  + 3MgO

 The  reaction is  a single replacement  reaction  because  Mg replaces Fe  from  its  compound.

The given reaction is a redox reaction known as a single displacement or single replacement reaction. The coefficients needed to balance the equation are as follows:

2Mg + Fe₂O₃ → 2Fe + 3MgO

A single displacement reaction, also known as a single replacement reaction, is a type of chemical reaction in which an element or ion in a compound is replaced by another element. In this reaction, one element is displaced from its compound and takes the place of another element, resulting in the formation of a new compound. The general format of a single displacement reaction can be represented as:

A + BC → AC + B

Where A is the element that displaces B from the compound BC, leading to the formation of the new compound AC. This type of reaction is often observed in reactions involving metals and their salts, where a more reactive metal displaces a less reactive metal from its salt solution. The reactivity of the elements involved determines the feasibility and outcome of the reaction.

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The predominant olefin formed in the dehydration of 2-methyl-2-butanol is 2-methylbutene.

The predominant olefin formed in the dehydration of 2-methyl-2-butanol is 2-methylbutene. During the dehydration process, a water molecule is eliminated from 2-methyl-2-butanol, resulting in the formation of 2-methylbutene. This is the major product because it is the most stable and thermodynamically favored product.

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The olefin that would be predominate in the product of the dehydration of 2-methyl-2-butanol is 2-methyl-2-butene, also known as isobutene. The dehydration involves the removal of a hydrogen and a hydroxyl group, resulting in the formation of a double bond, creating the said olefin. The formation of isobutene is favored due to its relatively more stable structure.

The olefin that should predominate in the product of the dehydration of 2-methyl-2-butanol is 2-methyl-2-butene, also known as isobutene. This reaction can produce either a cis-isomer or a trans-isomer.

The process of dehydration involves the removal of a hydrogen and a hydroxyl group (OH) from the 2-methyl-2-butanol molecule under the influence of a strong acid like sulfuric acid. This results in the formation of a double bond, creating the said olefin - 2-methyl-2-butene. The formation of isobutene is favored due to its relatively more stable structure, which is attributed to increased steric hindrance in the molecule.

Finally, it's worth noting that the overall intermolecular forces (IMFs), particularly hydrogen bonding, are important factors affecting the vapor pressure of the resultant olefin.

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Final answer:

Sensitivity analysis is concerned with how changes in variables or assumptions impact the optimal solution of a model, assisting in decision-making by evaluating the solution's robustness under different conditions. The correct option is C.

Explanation:

Sensitivity analysis is primarily concerned with understanding how changes in certain variables or assumptions affect the outcome of a model. Specifically, this type of analysis is focused on the impact of these changes on the optimal solution. It systematically alters key assumptions, computations, or input data, comparing the new results against the original model to assess the variance. This process is valuable in both analytical and computational approaches to solve constrained optimization problems. By exploring the comparative statics analysis, sensitivity analysis helps in determining how a firm, for instance, would respond to changes in one of its exogenous variables, holding all else constant (ceteris paribus).

In essence, sensitivity analysis serves as a critical tool in decision-making processes, assisting in evaluating the robustness and reliability of an optimal solution under varying conditions.

Elements heavier than iron are created during the violent explosion of a star known as a supernova. After the supernova, these elements are ejected into space and later form new stars and planets. Our presence on Earth, abundant in heavy elements, is a result of generations of stars synthesizing these elements.

Elements heavier than iron are made in the core of massive stars during the process of nucleosynthesis. However, when these stars exhaust their nuclear fuel, they die in an event known as a supernova. As the star explodes, its violent conditions lead to the creation of elements heavier than iron. The fusion of silicon into iron is the last step in nonexplosive element production inside a star. Beyond this point, due to iron's stability, fusion reactions end up absorbing energy instead of releasing it, leading to the star's collapse.

Most of these heavy elements are later ejected into space, enriching interstellar space with heavier elements. Over time, these elements are recycled to form new stars and planets, progressively leading to an increase in the proportion of heavier elements in the universe. Therefore, our presence on Earth, which is rich in heavy elements like silicon and iron, is due to generations of stars synthesizing these elements.

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Answer: The temperature increase will be 31.70°C.

Explanation:

To calculate the increase in the temperature of the system, we use the equation:

[tex]q=mc\Delta T[/tex]

where,

q = Heat absorbed = 36.5 kJ = 36500J

m = Mass of water = 275 g

c = Specific heat capacity of water = [tex]4.186J/g^oC[/tex]

[tex]\Delta T[/tex] = change in temperature = ? °C

Putting values in above equation, we get:

[tex]36500J=275\times 4.186J/g^oC\times \Delta T\\\\\Delta T=31.70^oC[/tex]

Hence, the temperature increase will be 31.70°C.

The number of hydrogen atoms in 8.90 mol of ammonium sulfide is  4.28×10²⁵ atoms.

This is referred to as a proportionality factor which tells us about the number of constituent particles in a sample. The constant is  6.02ₓ 10²³.

Ammonium sulfide which is denoted as (NH4)₂S has 2 nitrogen, 8 hydrogen and 2 sulfur atoms present.

We were told that the amount of ammonium sulfide is 8.90mol.

Number of hydrogen atoms =  8/1 × 8.9 mol= 71.2 moles of H₂.

The number of Hydrogen atoms in  8.90 mol of ammonium sulfide is 71.2 moles ˣ 6.02ˣ 10²³ = 4.28 ˣ10²⁵ atoms.

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Naphthalene has a higher melting point than biphenyl because naphthalene is a polar compound while biphenyl is a non-polar compound. Studies show that polar compounds have higher melting and boiling points than nonpolar compounds. It is because polar compounds have strong intermolecular forces.

Final answer:

Naphthalene has a higher melting point than biphenyl due to its compact structure with fused benzene rings, resulting in greater π-electron delocalization and stronger intermolecular forces. The fulfillment of Hückel's rule with its 10 π electrons also contributes to naphthalene's stability and higher melting point.

Explanation:

Naphthalene has a higher melting point than biphenyl because of its structural differences and the stronger intermolecular forces that result from these differences. Naphthalene is composed of two fused benzene rings, which means it has a more compact structure and a greater degree of π-electron delocalization than biphenyl, which consists of two benzene rings connected by a single bond.

The π-electron delocalization in naphthalene contributes to a greater stability and a higher degree of symmetry than biphenyl, which in turn leads to stronger intermolecular forces, namely London dispersion forces. Furthermore, naphthalene fulfills Hückel's rule with its 10 π electrons, which provides additional stability due to the filled bonding molecular orbitals. These factors result in a higher energy requirement to overcome the intermolecular forces in naphthalene, thereby giving it a higher melting point compared to biphenyl.

Answer:

[tex]2POCl_3(g) --> 2PCl_3(g) + O_2(g)[/tex]

Explanation:

Hello,

For the listed chemical reactions, one can predict the one which has a positive ΔS° is:

[tex]2POCl_3(g) --> 2PCl_3(g) + O_2(g)[/tex]

This is foreseen owing to the greater number of products (2) by contrast with the number of reagents (1). Moreover, for such reaction, there is a greater amount of moles at the products than at the reagents.

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The scientist observed a blue liquid with a density of 1.2 g/cm³ that reacts with carbon dioxide. The blue color and reaction with carbon dioxide are characteristic properties of the substance, but density is not.

The properties observed by the scientist are:

The blue color and reaction with carbon dioxide are characteristic properties of the unknown substance.

However, density is not a characteristic property, as different substances can have the same density.

Since its structure is depicted by dots, which cannot describe it,

Tetrahedral molecules like methane have four comparable C-H bonds.

An organic compound's skeletal structure is made up of a group of atoms that are joined together to form the compound's fundamental structure. Chains, branches, and/or rings of bound atoms can make up the skeleton. Heteroatoms are skeletal atoms that are not carbon or hydrogen.

How can we know that methane has four spheres?

We start with what we already know: the geometry of the methane molecule has the carbon at the center and the four C-H bonds pointing towards the corners. In methane, the carbon atoms form four bonds, one to each of the four hydrogen atoms.

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Answer :  The value of [tex]pK_b[/tex] for hypochlorous anion is, 6.47

Explanation :

As we know that,

[tex]pK_a+pK_b=pK_w\\\\pK_a+pK_b=14\\\\pK_b=14-pK_a\\\\pK_b=14-(-\log K_a)\\\\pK_b=14+\log (K_a)[/tex]

Now put the value of [tex]K_a[/tex] in this expression, we get the value of [tex]pK_b[/tex]

[tex]pK_b=14+\log (3.0\times 10^{-8})[/tex]

[tex]pK_b=14+\log 3-8[/tex]

[tex]pK_b=6.47[/tex]

Therefore, the value of [tex]pK_b[/tex] for hypochlorous anion is, 6.47

The difference between strong and weak acids is determined by the acid dissociation constant (Kₐ). As Kₐ rises, the acid dissociates more. Therefore, strong acids must dissociate more in water. On the other hand, a weak acid has a lower propensity to ionize and release a hydrogen ion, resulting in a less acidic solution.

The standard used to calculate a molecule's alkalinity is called pkb. It is employed to gauge fundamental strength. The base will be more powerful with a lower pKb value. It is akin to the base dissociation constant's negative logarithm, Kb.

The equation connecting pKa and pKb is:

pKa + pKb = pKw

pKa + pKb = 14

pKb = 14-pKa

pKb = 14 - (-log Ka)

pKb = 14 + log (3.0 × 10⁻⁸)

pKb = 14 - 7.52

pKb = 6.48

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The correct answer is

D .al2O3

Explanation:

The offense in electronegativity is subject for the ionic bonds in aluminum and oxygen, Ionic bonds are created between cations and anions. A cation is formed when a metal ion spends a valence electron while an anion is produced when non-metal gains a valence electron. They both achieve a more stable electronic arrangement through this change.

Answer:

in other words its D

Explanation:

Final answer:

The symbol for aluminum foil is Al. It is a silvery-white, soft, nonmagnetic, and ductile metal.

Explanation:

The symbol for aluminum foil is Al. Aluminum is a chemical element with the symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic, and ductile metal in the boron group. Aluminum foil is commonly used in packaging, cooking, and insulation.

The correct answer is  

Zirconium-93

Since nothing else matches up with 40 protons  and 51 neutrons

So your answer is  

Zirconium-93