"Inert" xenon actually forms many compounds, especially with highly electronegative fluorine. The ΔH° values for xenon difluoride, tetrafluoride, and hexafluoride are -2105, - 2284, and - 2402 kJ/mol, respectively. Find the average bond energy of the Xe¬F bonds in each fluoride.

Answer:

312 minutes

Explanation:

because 1 hour = 60 minutes this is the example they give you so then you do the math from there

The mass number of the third isotope, given the data from the question is 34

The mass number of the third isotope can be obtained as illustrated below:

Relative atomic mass = [(Mass of 1st × Abundance of 1st) / 100] + [(Mass of 2nd × Abundance of 2nd) / 100] + [(Mass of 3rd × Abundance of 3rd) / 100]

32.133 = [(32 × 92.4) / 100] + [(33 × 1.9) / 100] + [(Mass of 3rd × 5.7) / 100]

32.133 = 29.568 + 0.627 + (Mass of 3rd × 0.057)

32.133 = 30.195 + (Mass of 3rd × 0.057)

Collect like term

32.133 - 30.195 = Mass of 3rd × 0.057

1.938 = Mass of 3rd × 0.057

Divide both sides by 0.057

Mass of 3rd = 1.938 / 0.057

Mass of 3rd = 34

Thus, we can conclude that the mass of the 3rd isotope is 34

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Missing part:

See attached photo

The diameter of a hydrogen atom is approximately 10^-10 meters. If a protein molecule is 2000 times the diameter of a hydrogen atom, its overall length would be 2000 * 10^-10 meters.

To write this length in scientific notation, we express it as a number between 1 and 10, multiplied by a power of 10. In this case, 2000 * 10^-10 can be written as 2 * 10^3 * 10^-10.

To simplify, we add the exponents of 10: 3 + (-10) = -7. So, the length of the protein molecule in scientific notation is 2 * 10^-7 meters.

In summary, the length of the protein molecule in scientific notation is 2 * 10^-7 meters.

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The paired t-test yields a different conclusion than the normal t-test because it accounts for the paired nature of the data, comparing the measurements taken at the top and bottom of the lake separately.

In this scenario, the paired t-test is appropriate because it analyzes the data as pairs, considering the chloride levels measured at the top and bottom of the lake for each sample. By comparing the differences within each pair, the paired t-test determines whether there is a significant difference between the chloride levels at the top and bottom of the lake.

Using the paired t-test, the differences between the paired observations are calculated, and the null hypothesis assumes that the mean difference is zero (no significant difference between the top and bottom chloride levels). The test then determines whether the observed differences are statistically significant at a chosen confidence level, in this case, 95%.

The normal t-test for differences in means, on the other hand, would treat the top and bottom chloride levels as separate and unrelated groups, disregarding their paired nature. By pooling the data and conducting a standard t-test, the analysis assumes that the two sets of measurements are independent, which may not be appropriate in this case. This can lead to a different conclusion compared to the paired t-test.

The different conclusion drawn from using the paired t-test compared to pooling the data and using the normal t-test is due to the consideration of the paired nature of the measurements. The paired t-test takes into account the potential correlation or connection between the measurements taken at the same location (top and bottom of the lake) and assesses the differences within each pair.

Pooling the data and using the normal t-test treats the measurements as independent, disregarding the pairing. This can result in a loss of valuable information and may lead to an inaccurate conclusion. The paired t-test is more appropriate when dealing with dependent or related measurements, ensuring a more accurate assessment of the differences between the top and bottom chloride levels.

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One thousand feet of the same wire have a resistance of 1333.3 ohm.

A is the ideal answer.

The readout should remain steady at about 1 ohm. Two or three ohms is still OK, but if one of your cables displays significantly higher readings than the others (of equal length), you should make sure that all of its conductors actually make optimal contact with the terminals in each plug.

The resistance of a wire is inversely related to its cross-sectional area and directly proportional to its length.

R = ρ × L / A.

R = 500 /375 *1000

R = 1,333 ohms

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Terminations that are typically the result of conflict between senior managers, one of whom may be terminated along with the project, are known as **executive terminations**.

Executive terminations occur when there is a **disagreement or conflict** among top-level management, leading to the termination of one or more senior managers as well as the potential cancellation of a project. These conflicts can arise due to differences in strategic direction, performance concerns, or other issues. In such situations, the decision to terminate an executive is often made by the board of directors or other high-ranking officials within the organization. By understanding the reasons behind executive terminations, companies can work towards minimizing conflicts and ensuring a more cohesive management team.

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Specific heat capacity is 139 J/kgC and molar heat capacity is 221 J/C/mol.

To calculate the specific heat capacity we will be using the equation
Q = mC∆T
Where Q = energy added or lost
m = the mass of the substancec = the specific heat of the substance
∆T is the difference in temperature usually written as T2-T1
Given Q=585Jm = 125.6 grams or 0.1256 kg

Where should find c =?
T2 =53.5°CT1 = 20 °C585 = 0.1256x C x(53.5–20)585 =4.2076xC585/4.2076
=139J/kg°C = C
Now,
Using the equation c_m = C/n

Where c_m = molar heat capacity
C = specific heat capacity
n = number of moles in kgc_m = 139/0.628
= 221 J/°C/mol

Therefore, specific heat capacity is 139 J/kgC and molar heat capacity is 221 J/C/mol.

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Answer:

D

Explanation:

The picture depicts the data of the chemical, explaining that as the temperature rises, the chemical reaction rate would increase as well.

This change is indicated by the symbol ΔE, which represents the energy transfer associated with the contraction. In a contracting system, the energy is being released or transferred to the surroundings, resulting in a decrease in temperature.

The contraction of a system involves a decrease in volume or size. As the system contracts, its molecules or particles move closer together, leading to a decrease in the system's energy. According to the first law of thermodynamics, energy cannot be created or destroyed but can only be transferred or converted from one form to another. In this case, the energy that was stored in the system is released or transferred to the surroundings as the system contracts. The transfer of energy from the system to the surroundings typically occurs in the form of heat. As the system contracts, its particles lose kinetic energy, which is transferred to the surrounding particles, causing them to gain kinetic energy. This transfer of energy results in an increase in the average kinetic energy of the surroundings, leading to a rise in temperature. In other words, the contraction of the system leads to a decrease in its internal energy, and this energy is distributed to the surroundings, causing them to become colder.

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Answer:

I think true

Explanation:

Answer:

v = 10 m/s

Explanation:

Given: An object has a kinetic energy of 250 J and a mass of 5 kg

To find: Its velocity

Formula: \(KE = \frac{1}{2} mv^2\)

Solution: In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (\(\frac{1}{2}\) × m) multiplied by the velocity squared. In this case, an object with a mass of 5 kg (m = 5 kg) is moving at a velocity of 10 meters per second (v = 10 m/s), the kinetic energy is equal to 250 Joules, or (\(\frac{1}{2}\) × 5 kg) × 10 m/s².

Therefore, the velocity is v = 10 meters per second.

The equilibrium relation allows us to find which statement is correct:

    B)  The balloon will shrink.

The stable equilibrium condition that the sum of forces in a system is zero

            ∑ F = 0

Where F is the force

Helium is a noble gas, which has a liquefaction temperature of 4.2K, therefore in almost all cases we find it in the gaseous state

The balloon is in an equilibrium between the outside atmospheric pressure and the pressure of the helium gas inside, when the temperature decreases the energy of the helium molecules decreases and has a lower speed, therefore creating a lower pressure inside, for therefore the balloon decreases its size until the pressures equalize.

Let's examine the claims

A) False. The balloon expands with increasing temperature

B) True. The balloon should contract until it equalizes the internal and external pressure

C) False. Helium gas becomes liquid at very low temperatures (4.2K)

D) False. One of the statements describes the process well

In conclusion the equilibrium relationship we can find which statement is correct:

    B)  The balloon will shrink.

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XY₂ is the molecular formula of an ionic compound where X is magnesium (Mg) and Y is chloride (Cl) and magnesium is metal of second group of the periodic table and represents the 2nd group and chloride belongs to 17th group.

Ionic compounds are those which completely dissociate into their constituent ions in water one is metal and other is non metal.

They complete their octave by sharing lone pair of electron and attend the positive and negative charge after dissociation are know as ionic compounds.

Therefore, the molecular formula of an ionic compound where X is magnesium (Mg) and Y is chloride (Cl) and magnesium is metal of second group of the periodic table and represents the 2nd group and chloride belongs to 17th group.

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Answer:

a mixture that is made when one substance dissolves and mixes with another substance

Answer:

164moles

Explanation:

Given parameters:

Number of molecules of CO₂   = 9.86 x 10²⁵molecules

Unknown:

Number of moles  = ?

Solution:

To solve this problem, a mole of any substance contains the Avogadro's number of particles.

In that;

        6.02 x 10²³ molecules makes up 1 mole of a substance

        9.86 x 10²⁵molecules   contains \(\frac{9.86 x 10^{25} }{6.02 x 10^{23} }\)   = 1.64 x 10²moles

The number of moles is 164moles

Explanation:

Let's consider sulphate radical, the chemical formula is given by SO42−. Here we can see there is a -2 charge on SO4, which means it has -2 valency. Now look at the option (a), phosphate can be written as PO43−. There is -3 charge on PO4, that means it has -3 valency.

Explanation:

molecular formula of sulphate ion is SO₄²⁻

and

the valency of sulphate ion is 2.

Answer:

radiation takes place with energy between a heat source and an object

Explanation:

g o o g l e

Answer:

Dylan invested $ 600 in a savings account at a 1.6 % annual interest rate . He made no deposits or withdrawals on the account for 2 years. The interest was compounded annually . Find, to the nearest cent, the balance in the account after 2 years. a₁ What information from the question is important ? b . How much does Dylan have in his bank account after 2 years ? Show work .

Answer:0.124 mol- I think not completely positive on it

Explanation:6680⋅mm⋅Hg is not a realistic measurement of pressure....

I assume you mean 6680⋅mm⋅Hg/760⋅mm⋅Hg⋅atm^-1 = 8.79⋅atm.

And we use the Ideal Gas Equation:

n=PV/RT=8.79⋅atm×0.347⋅L/0.0821⋅L⋅atm⋅K−1⋅mol−1×300⋅K=0.124⋅mol

Answer:

*ೃ: He became one of the foremost advocates of freedom of belief. John Locke is also known as the "Father of liberalism."

Answer:Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water.

Explanation:

Answer:

\(\boxed {\boxed {\sf 28 \ grams}}\)

Explanation:

The Law of Conservation of Mass states that mass cannot be created or destroyed.

In terms of a chemical reaction, the mass of the reactants has to equal the mass of the products.

The reactants are A and B. The mass of A is 19 grams and the mass of B is 24 grams. Add the masses.

This is the mass of the reactants.

The products and C and D. The mass of C is 15 grams. The mass of the products has to equal the mass of the reactants, which is 43 grams. Subtract 15 from 43 to find D's mass.

28 grams of D will be produced.

Answer: Weather currents change wind tempature and there for change the weather of the seasons.

When table salt (sodium chloride which ionizes into Na and Cl) is added to alginate, a gel does not form and spherification does not occur. This happens because the salt only has one positive charge that neutralizes the negative charge in the alginate.

There are various types of Spherification. Spherification is the creation of small spheres with a thin film on the surface and a liquid center. The process of spherification is mostly used in molecular gastronomy to make small, flavorful balls of liquid ingredients that burst in the mouth when bitten into. The method involves a process of encapsulating liquid droplets in a sphere made of a gel-like film. This process requires sodium alginate (E401), a gel-forming ingredient that thickens the liquids.

Sodium alginate gelation occurs as a result of the mixture of an alginate solution with a cation solution that causes the solution to gel. The sodium ions present in the solution swap with calcium ions present in the cation solution, causing a gel to form. This occurs as a result of a chemical reaction known as cross-linking. When table salt is added to the alginate solution, a gel does not form and spherification does not occur since the salt only has one positive charge that neutralizes the negative charge in the alginate. Alginate requires a doubly charged cation to cross-link.

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Answer:

Atomic number shows u the amount of protons there are in the atom

The protons are equal to the number of electrons

The group number tells  you  the number of electrons on the outer shell

(Sorry if u didn’t want the extra info but really it’s simple like magnesium has 12 so it has 12 protons/ 12 electrons)

Answer:

To calculate the numbers of subatomic particles in an atom, use its atomic  number and mass number:

1. number of protons = atomic number.

2. number of electrons = atomic number.

3.number of neutrons = mass number - atomic number.

The pH and the pOH of an aqueous solution that is 0.045 M in HCl(aq) and 0.095 M in HBr(aq) at 25 °C is 1.35, and 12.98 respectively.

To calculate the pH and pOH of the solution, we need to use the concentration of the acidic solutions and the dissociation constants of HCl and HBr.

First, calculate the pH:

For HCl (aq):

[HCl] = 0.045 M

HCl is a strong acid and dissociates completely in water, so the concentration of H⁺ ions is equal to the concentration of HCl:

[H⁺] = 0.045 M

Taking the negative logarithm (base 10) of the H⁺ concentration gives us the pH:

pH = -log10(0.045)

pH = 1.35

Now, let's calculate the pOH:

For HBr(aq):

[HBr] = 0.095 M

HBr is also a strong acid, and its dissociation is similar to HCl. The concentration of H⁺ ions is equal to the concentration of HBr:

[H⁺] = 0.095 M

Again, taking the negative logarithm (base 10) of the H⁺ concentration gives us the pH:

pH = -log10(0.095)

pH = 1.02

Since pH + pOH = 14 (at 25 °C), we can calculate the pOH:

pOH = 14 - pH

pOH = 14 - 1.02

pOH = 12.98

Therefore, the pH of the solution is approximately 1.35, and the pOH is approximately 12.98.

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The mole ratio of PbO2 to water in the given chemical reaction is 1:2.

According to the balanced chemical equation, for every 1 mole of PbO2 (lead dioxide), 2 moles of H2O (water) are produced. This can be seen from the coefficients in the equation, where the stoichiometric ratio is 1:2 between PbO2 and H2O.

The balanced equation represents a redox reaction that occurs within a car battery. In this reaction, lead (Pb) and lead dioxide (PbO2) react with sulfuric acid (H2SO4) to produce lead sulfate (PbSO4) and water (H2O). The mole ratio of reactants and products is determined by the coefficients in the balanced equation.

In this case, the coefficient of PbO2 is 1, indicating that 1 mole of PbO2 is consumed. The coefficient of H2O is 2, indicating that 2 moles of H2O are produced. Therefore, the mole ratio of PbO2 to water is 1:2, meaning that for every mole of PbO2, 2 moles of water are produced as a result of the chemical reaction.

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When NaCl is placed in water, it becomes an aqueous solution, one thing that occurs in this situation is that NaCl, which is an ionic compound, will dissociate into Na+ and Cl-, this dissociation into ions will cause the solution to become a good conductor of electricity. Therefore the correct answer will be letter A

Step 1 - Understanding the law of mass conservation

In physics, chemistry and biology the law of mass conservation states that no atom is created or destroyed, they are only rearranged in any given physical/chemical/biological process.

Therefore, if all atoms are preserved, the total mass of reactants and products is the same.

Step 2 - Answering the exercise

The melting of an ice cube is a physical process and, as such, is also subjected to the law of mass conservation. Therefore, if 10g of ice melt, 10g of water are produced.

Answer: 10.0g