many plastic bags are made of polyethylene. despite only containing dispersion forces, the material is flexible and stays together. speculate why that is.

For producing 639L of \(SF_6\), a volume of 1916.96L of \(F_2\) gas is required for the reaction.

If the pressure and temperature at which the reaction occurs is known, we may use the ideal gas law to compute the stoichiometry of processes involving gases by using the connection between the volume (in liters) and quantity of gases (in moles). A chemical reaction's volume of gas can be evaluated by collecting it in an inverted vessel filled with water. The gas pushes water out of the vessel, and the amount of liquid displaced is proportional to the amount or volume of gas.

Given:

Volume of \(SF_6\) = 639L

Pressure, P = 2atm

Temperature, T = 273.15K

To find:

Volume, V of \(F_2\) gas = ?

Formula:

PV = nRT

Calculations:

No. of moles of \(SF_6\) = 2 x 639 / 0.082 x 273.15

No. of moles of \(SF_6\) = 57.057 moles

\(S (s) + 3F_2 (g) \rightarrow SF_6 (g)\)

From the reaction,

1 mole of \(SF_6\) is formed from 3 moles of \(F_2\)

Therefore,

No. of moles of \(F_2\) = 3 x 57.057 = 171.171 moles

Volume of \(F_2\) = 171.171 x 0.082 x 273.15 / 2

Volume of \(F_2\) = 1916.96L

Result:

1916.96L of \(F_2\) gas is required to produce 639L of \(SF_6\).

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A limiting reactant problem is a type of stoichiometry problem that involves determining which reactant in a chemical reaction will be completely consumed, and therefore limit the amount of product that can be formed.

The key clue that a problem is a limiting reactant problem is the presence of information about the amounts or masses of two or more reactants that are involved in a chemical reaction. In a limiting reactant problem, you are typically given the amounts of two or more reactants, and asked to determine the amount of product that can be formed.

To solve a limiting reactant problem, you must first determine the balanced chemical equation for the reaction, and then use stoichiometry to calculate the theoretical amount of product that can be formed from each reactant. The reactant that produces the smallest amount of product is the limiting reactant, because it will be completely consumed in the reaction, while the other reactant(s) will be left over.

The calculation of the limiting reactant and the amount of product produced from it is what sets a limiting reactant problem apart from other stoichiometry problems. In other types of stoichiometry problems, you may be given the amount of a single reactant or product, and asked to find the amount of another reactant or product using stoichiometry.

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A liquid has an enthalpy of vaporization of 30.8 kj/mol. at 273 k it has a vapor pressure of 102 mmhg. The normal boiling point of this liquid is 320 K

In order to get the normal boiling point of the liquid, we will use the Clausius-Clapeyron equation expressed according to the equation:

ln \(\frac{P2}{P1}\) = (ΔHvap/R) . (\(\frac{1}{T1}\) - \(\frac{1}{T2}\))

where:

P1 is the vapor pressure of that substance at T1

P2 is the vapor pressure of that substance at T2

ΔHvap is the enthalpy of vaporization.

R is the gas constant - usually expressed as 8.31 J/Kmol

Since we are looking for the normal boiling point, we can set P2 = 1 atm (101.3 kPa) and T2 = the normal boiling point temperature.

Rearranging the equation to solve for T2:

T2 = (ΔHvap/R) * \((1/T1 - 1/P2)^{-1}\) + T1

Plugging in the values we have:

T2 = (30.8 kJ/mol) / (8.31 J/mol*K) * \((1/273 K - 1/101.3 kPa)^{-1}\) + 273 K

Solving for T2, the normal boiling point temperature is approximately 320.2 K ≈ 320 K

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The differential equation that describes the process is dQ/dt = (1/4)r - Qr, with an initial condition of Q(0) = 10 lbs.

In this process, we have a tank initially containing 10 lbs of salt dissolved in 100 gallons of water. Water with a concentration of 1/4 lb of salt per gallon enters the tank at a rate of r gallons per minute. The mixture is continuously stirred, and at the same rate, it drains from the tank.

To set up a differential equation for this process, we consider the rate of change of salt in the tank over time, denoted by dQ/dt, where Q represents the amount of salt in pounds.

The rate at which salt enters the tank is given by (1/4)r, as the concentration of salt in the incoming water is 1/4 lb per gallon, and it enters at a rate of r gallons per minute. The rate at which salt drains from the tank is Qr, as Q represents the amount of salt in pounds and it drains at a rate of r gallons per minute.

Thus, the differential equation that describes this process is dQ/dt = (1/4)r - Qr.

The initial condition is Q(0) = 10 lbs, as the tank initially contains 10 lbs of salt.

To solve this differential equation, one can integrate both sides with respect to time and apply the initial condition to obtain the solution, which is Q(t) = (1/4)t - 10.

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Answer:

Mercury

Explanation:

mercury, and it's the only metal that normally exists on Earth as a liquid.

Answer:

C mantle

Explanation:

Answer:

3 5 5 3

Explanation:

Not 100% sure on this question

When H2CO3 dissociates into H and HCO3- the pH of water increases to an extent but not much.

       H2CO3-->H+ + HCO3-

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Answer:

The gas under pressure subjected to heat can cause the tank to explode. A scuba tank filled to capacity with compressed air at 3000 psi could just as easily go up to 3400-3500 psi if heated

Explanation:

Air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature. Hence option D is correct.

Pressure is defined as the force applied perpendicularly to an object's surface divided by the surface area over which it is applied. The movement of the molecules and the collisions they have with one another and the vessel walls cause the pressure to build up. According to general relativity theory, pressure contributes to the mass-energy cause of gravity by making a gravitational field stronger.

The tank may blow up if the gas within was under pressure and exposed to heat. If heated, the pressure of a scuba tank filled to capacity with compressed air at 3000 psi may readily increase to 3400-3500 psi. Because air molecules are free to move, the temperature in the tank rises as more air is introduced, as the molecules move and collide more quickly.

Thus, air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature. Hence option D is correct.

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Answer:

True

Explanation:

In a spiral galaxy, stars had and dust is collected in spiral arms that spread outward from the center of the galaxy. This type of galaxies is composed of young and old stars; being the older ones usually found in the nucleus. Therefore, this statement is True. I

Answer:

true

Explanation:

Answer:

A. can travel through empty space

Explanation:

it is said dat electro magnetic waves or radiation travels through the vacuum of space

Answer:

all of the above. Because, Y'know, electromagnetic radiation is like that.

Option b-A The isotope ⁷₂H (7He) is more tightly bound than ⁵₂H (5He).

The stability of an isotope depends on its binding energy, which represents the amount of energy required to break apart the nucleus into its constituent particles. Higher binding energy indicates greater stability and tighter binding of nucleons within the nucleus.

To determine which isotope is more tightly bound, we compare their binding energies. The binding energy is related to the mass defect, which is the difference between the sum of the masses of the individual nucleons and the actual mass of the nucleus.

In this case, the atomic mass of ⁷₂H (7He) is 7.027991 u, and the atomic mass of ⁵₂H (5He) is 5.012057 u. The greater the mass defect, the more tightly bound the nucleus. Since the mass defect of ⁷₂H (7He) is greater than that of ⁵₂H (5He), it implies that ⁷₂H (7He) has a higher binding energy and is more tightly bound.

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Answer:

Element are substances made up of the same kind of atoms

The stoichiometric balanced equation helps to find out the mass of carbon dioxide released. The mass of the carbon dioxide produced when 0.76 grams of methane is burned is 2.09 g.

The relative amounts of the products and reactants in a balanced equation is defined as the stoichiometry of a reaction. This concept is generally used to balance the chemical equations.

The combination of hydrogen and oxygen to form water is represented by the stoichiometric equation:

2H₂ + O₂ → 2H₂O

Here in the given CH₄ + 2 O₂ --> CO₂ + 2 H₂O, 16 g of methane reacts with 64 g of oxygen and produces 44 g of carbon dioxide and 36 g of water.

So 0.76 g of CH₄ produces 44 g × 0.76 g / 16 g = 2.09 g CO₂ .

Thus the mass of CO₂ produced is 2.09 g.

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Answer:

the answer is....... D. Plasma

Answer:

Plasma

Explanation:

Got it right

Answer: Neutralization reaction

Explanation:

When an acidic solution is mixed with a basic solution, the result is a neutralization reaction. Neutralization reactions are reactions between acids and bases that result in the formation of a salt and water.

Acid + Base → Salt + Water

Here are some examples of acid-base reactions:

H.ydrochloric acid (HCl) and sodium hydroxide (NaOH):

HCl + NaOH → NaCl + H2O

Sulfuric acid (H2SO4) and calcium hydroxide (Ca(OH)2):

H2SO4 + Ca(OH)2 → CaSO4 + 2H2O

The chemical formula for the compound formed between calcium and sulfur is CaS.

What is the chemical formula for calcium sulfide?

Calcium sulfide (CaS) is a white or off-white, odorless, inorganic compound with the chemical formula CaS.

Calcium and sulfur are the two elements that make up this compound.

It is used in the manufacture of luminous paints, fluorescent powders, and as a reducing agent for smelting metals, among other things.

Calcium sulfide is a compound with the molecular formula CaS.

This compound can be prepared by heating calcium carbonate and elemental sulfur in a furnace and is the calcium salt of hydrogen sulfide.

It is widely used in the leather industry as a liming agent, and it is also used in waste water treatment as an alkaline reagent.

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The volume of DI water in the flask is 14.80 mL, which corresponds to answer choice (c).

In this problem, we are given the initial and final readings of a buret filled with deionized (DI) water and asked to determine the volume of DI water dispensed into a flask. Using the difference between the final and initial buret readings, we can calculate the volume of DI water dispensed.

The volume of DI water dispensed into the flask can be calculated as follows:

Volume dispensed = Final buret reading - Initial buret reading

Volume dispensed = 17.67 mL - 2.87 mL

Volume dispensed = 14.80 mL

Therefore, the volume of DI water (mL) in the flask is 14.80 mL, which is option (c).

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If excess ammonium sulfate reacts with 20.0g of calcium hydroxide then liters of ammonia are produced at STP 0.081L

Ammonium sulphate is the organic solvent and the primary use of ammonium sulphate is as a fertilizer for alkaline soils

Here given reaction is

(NH₄)₂SO₄ + Ca(OH)₂ → CaSO₄ + NH₃ + H₂O

Here given data is

Calcium hydroxide  = 20.0g

We have to find liters of ammonia are produced at STP =?

20.0g of (NH₄)₂SO₄ STP = ?

Then 20.0g of (NH₄)₂SO₄×1 mol/132g×0.54L/1 mol = 0.081L

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Accuracy refers to how close the measurements that are made are to the real value.

The term accuracy refers to how close the measurements that are made are to the real value. The precision refers to how close the measurements are to each other in value. But precision and accuracy play a role in deciding whether or not a measurement is accurate.

Looking at the table;

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The absorbance at 280 nm represents the presence of protein contamination in a sample when performing an Abs Ratio at 260:280 nm.

Absorbance Ratio (Abs Ratio) is a measure of the amount of impurities and contaminants in a nucleic acid sample. It is calculated by dividing the absorbance value of a nucleic acid sample at a specific wavelength (260 nm) by its absorbance value at another wavelength (either 280 nm or 230 nm).

The absorbance ratio at 260:280 nm and 260:230 nm can be used to assess the purity of nucleic acid samples by determining the concentration of protein and organic compounds that are co-extracted along with the DNA or RNA, which is purified from biological material.

The absorbance at 280 nm represents the presence of protein contamination in a sample when performing an Abs Ratio at 260:280 nm. Absorbance at 280 nm is typically used to assess protein contamination in a nucleic acid sample because proteins have a strong absorbance peak at this wavelength.

High absorbance at 280 nm and low absorbance at 260 nm indicate that the sample is contaminated with proteins. An Abs Ratio of 1.8-2.0 is considered to be an ideal ratio of purity for most nucleic acid samples.

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The solution to the equation and value of variable 21(3d - 4) + 100 = 58 is d = 2/3.

Solve the equation 21(3d - 4) + 100 = 58, we can begin by simplifying and isolating the variable:

21(3d - 4) + 100 = 58

Distribute 21 to the terms inside the parentheses:

63d - 84 + 100 = 58

Combine like terms:

63d + 16 = 58

Subtract 16 from both sides:

63d = 42

Divide both sides by 63:

d = 42/63

Simplifying the fraction gives:

d = 2/3

The solution to the equation is d = 2/3.

The solution to the equation 21(3d - 4) + 100 = 58 is d = 2/3. By simplifying the equation, we find that dividing both sides by 63 results in the solution of d = 2/3, which satisfies the original equation.

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The Ka value of the acid is 0.0041.

To find the Ka value of the acid, we can use the equation:

Ka = [H+][A-] / [HA], where [H+] represents the concentration of hydrogen ions, [A-] represents the concentration of the conjugate base, and [HA] represents the concentration of the acid.

Given that the pH of the solution is 2.36, we can calculate the concentration of hydrogen ions ([H+]) using the formula: [H+] = 10^(-pH).

So, [H+] = 10^(-2.36) = 0.0041 M.

Since the concentration of the acid (HA) is 0.059 M, and we assume that it fully dissociates, the concentration of the conjugate base ([A-]) is also 0.059 M.

Now, we can substitute these values into the equation for Ka:

Ka = (0.0041)(0.059) / 0.059 = 0.0041.

Therefore, the Ka value of the acid is 0.0041.

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Answer:

no lo sick parece efalso jhkr

Explanation:

The Frank's daughter buy him deodorant anymore because it doesn't make smell.

Deodorant is defined as a chemical applied to the skin to prevent or disguise body odor caused by the breakdown of perspiration or vaginal secretions by bacteria.

There are some side effects of deodorant if we use it in excess or regular.

Deodorants induce irritation and redness (due to alcohol), which leads to itching and, eventually, mild browning of the underarm area.

Some of the deodorant may contains to much of aluminum.

Too much aluminum in your system can lead to bone disorders and dementia.

Thus, the Frank's daughter buy him deodorant anymore because it doesn't make smell.

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Answer:

Mg + CuSO₄ = Cu + MgSO₄

Answer:the parts of the body which is nearest to  the ground ie thier back will show discoloration

Explanation:

If the body remains at a position for long hours, the parts of the body which is nearest to  the ground can develop a skin discoloration as a result of pooling of blood in the tissues and this is called livor mortis, which tends to be permanent from 8Hours upwards.

Answer: Thus X is Plutonium

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

General representation of alpha decay :

\(_{Z}^{A}\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\textrm{He}\)

where Z = atomic number

A= mass number

X and Y = atomic symbol of elements

\(_{Z}^{A}\textrm{X}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus \(_{94}^{239}\textrm{Pu}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus X is Plutonium with atomic number 94 and mass number 239

Answer:

the answer is D on edge

Explanation: