A container is filled with helium and nitrogen gas. A hole is poked into the container and the gases are


allowed to effuse. (A) Which gas would effuse faster? (B) Calculate the rate of effusion of helium to


nitrogen gas. (C) If it takes nitrogen gas 22 sec to effuse, how long would it take the helium gas?

Answer:

True

Explanation:

Document and photograph the evidence. Properly secure the evidence by placing it in a paper bag or envelope. Close, seal, or tape the paper bag or envelope. The examiner must initial, date, and time across the sealed area. Label the bag or envelope with the patient's identifying information.

Also, I took the quiz :)

Chemical fοrmula οf Irοn(II) οxide is FeO and Irοn(III) οxide is Fe2O3.(FeO) is a black οr brοwn pοwder that is used as a catalyst, reducing agent, and pigment.

A cοmpοund is a substance made οf twο οr mοre elements that are chemically bοnded tοgether. Cοmpοunds are fοrmed when atοms οf different elements share electrοns, fοrming chemical bοnds.

It is alsο used in the manufacturing οf ferrοus allοys, steel, and glass. Irοn(III) οxide (Fe₂O₃) is alsο a black οr red pοwder, but with a different chemical cοmpοsitiοn. It is used as a pigment and abrasive in paints and cοatings, a catalyst in the synthesis οf ammοnia, and a cοlοring agent in ceramics and plastics.

These twο fοrms οf irοn οxide are nοt the same cοmpοund, as they have different chemical fοrmulas and uses.

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Answer:

John Dalton

Explanation:

John Dalton (1766-1844) is the scientist credited for proposing the atomic theory. This theory explains several concepts that are relevant in the observable world.

Answer:

Simply put, essential amino acids are amino acids that cannot be made by the body. These amino acids must come from a person's diet, as the human body lacks the metabolic pathways required to synthesize these amino acids. ... Nonessential amino acids do not need to come from the diet.

Explanation:

hope it helps you

Answer:

4

Explanation:

........................................................

Answer:

electrical power. nnnnnnn

Answer:

the molecular formula of Ozone is O_3.

Answer: O₃

Explanation:

The chemical formula of ozone is O3. In the earth's stratosphere, ozone is formed from a two-step reactive process. First, sunlight breaks apart an oxygen molecule (O2 you'll recall) into two oxygen atoms. In the second step, these oxygen atoms collide with another oxygen atom to make ozone.

Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

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Answer:

condensation

Explanation:

going from gas to luquid

Answer:

condensation your welcome :)

Explanation:

wow 50 points for this??? TYSM!!!

Answer:

A. oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium

Explanation:

Water is always involved in hydrolysis reactions in the given options.

The term "hydrolysis" refers to the breakage of chemical bonds by the addition of water and represents the reaction of an organic chemical with water to produce two or more new chemicals. Some occurrences of hydrolysis include the formation of hydronium and bisulfate compounds when sulphuric dissolves in water or a salt of a weak acid or base is mixed with water.

Inversion is the mechanism of hydrolyzing sucrose to produce glucose and fructose. Invert sugar is the consequence of the hydrolysis of sucrose, which causes the sign of rotation to alter from dextro (+) to laevo (-).

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In solution 4 of part b, both the hydronium concentration and hydroxide concentration are 1 M due to the neutralization reaction between HCl and NaOH. The initial concentrations of H₃O⁺ and OH⁻ were 0.1 M, but they reacted to form water and resulted in equal final concentrations of 1 M for both ions.

To calculate the hydronium and hydroxide concentrations for solution 4 in part b, we need to first understand the equation for the reaction that occurred.

The equation given is: HCl + NaOH -> NaCl + H₂O

This tells us that one mole of HCl reacts with one mole of NaOH to produce one mole of NaCl and one mole of water.

Based on this equation, we know that the initial concentration of hydroxide ions (OH-) in solution 4 is equal to the initial concentration of sodium hydroxide (NaOH), which was given as 0.1 M.

Next, we need to determine the concentration of hydronium ions (H₃O⁺). Since HCl is a strong acid, it completely dissociates in water to produce H₃O⁺ and Cl⁻ ions. Therefore, we can assume that the initial concentration of H₃O⁺ is equal to the initial concentration of HCl, which was also given as 0.1 M.

Now, let's consider what happens when the HCl and NaOH are mixed together. They react to form NaCl and water, which means that the concentrations of H₃O⁺ and OH⁻ will change.

From the equation, we can see that the reaction consumes one mole of HCl and one mole of NaOH. This means that the final concentration of HCl and NaOH will both be zero.

To determine the final concentration of OH-, we need to use the fact that the reaction produces one mole of water for every mole of NaOH that reacts. Therefore, the final concentration of OH⁻ will be equal to the initial concentration of NaOH (0.1 M) divided by the volume of the solution.

If we assume that the volume of the solution is 100 mL (as stated in the question), then the final concentration of OH- will be:

[OH⁻] = 0.1 M / 0.1 L = 1 M

Finally, we can use the fact that the concentration of H₃O⁺ and OH⁻ must be equal in a neutral solution to determine the final concentration of H₃O⁺.

Since the final concentration of OH⁻ is 1 M, we know that the final concentration of H₃O⁺ must also be 1 M.

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There are dispersion intermolecular forces in a dimethyl ether.

Does dimethyl ether have a hydrogen bonding force?

An H-atom must be bound to an atom with a strong electronegative charge, such as F, O, or N. Since there are no H-atoms directly connected to O in dimethyl ether (CH3OCH3), ethers cannot form an H-bond.

Which molecule has stronger intermolecular forces, ethanol or dimethyl ether?

In a compound, the intermolecular forces will determine the surface tension. In contrast to dimethyl ether, which possesses dipole-dipole intermolecular forces, ethanol has an oxygen connected with a hydrogen, indicating that one of the forces is hydrogen bonding. So ethanol will have higher surface tension since hydrogen bonds are stronger than dipole-diple bonds.

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Answer:

55,000,000

Explanation:

550 hectometers [hm] = 55,000,000 millimeters [mm]

To promote the precipitation of calcium fluoride (\(CaF_{2}\)) from its aqueous ions, you would typically add a compound that can react with the dissolved ions and form a less soluble product. In this case, you could add a source of fluoride ions (\(F^{-}\)) to the solution, which would react with the calcium ions (\(Ca^{2+}\)) present to form calcium fluoride.

By adding a fluoride-containing compound, such as sodium fluoride (NaF) or hydrofluoric acid (HF), the equilibrium would shift towards the precipitation of calcium fluoride according to Le Chatelier's principle.

The increased concentration of fluoride ions would drive the reaction forward by consuming the calcium ions, resulting in the formation of solid calcium fluoride.

It is worth noting that the solubility of calcium fluoride is relatively low, so even without the addition of fluoride ions, some precipitation may occur. However, the presence of fluoride ions would significantly enhance the precipitation process.

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Answer:

one is across

Explanation:

That 7.09 tons of the mineral CaTiO3 is required to produce 5.00 tons of titanium metal. Here is the along with an  When titanium dioxide.

which is present in the mineral ilmenite, is converted into titanium tetrachloride, it can be purified through the Kroll process, resulting in the production of titanium metal. During this reaction, iron oxide (FeO) and coke are also used as reagents in addition to the mineral ilmenite. The balanced chemical equation is given below

:FeO + TiO2 + 2C → Ti + Fe + 2COFor every 1 mole of Ti (titanium)

we need 1 mole of TiO2.

Therefore, for 5.00 tons of Ti, we need:

5.00 tons Ti x (1000 kg/ton) x (1 mole Ti/47.87 g) x (1 mole TiO2/1 mole Ti) x (79.9 g/mole TiO2) x (1 ton/1000 kg) = 8.34 tons

TiO2However, the mineral ilmenite does not have a 100% composition of TiO2. Instead, it has a TiO2 content of about 60%. Therefore, the amount of ilmenite

(CaTiO3) we need to produce 8.34 tons of TiO2 can be found as follows:

8.34 tons TiO2 x (100/60) x (1 mole TiO2/79.9 g) x (1 mole CaTiO3/1 mole TiO2) x (240.9 g/mole CaTiO3) x (1 ton/1000 kg)

= 7.09 tons of ilmenite or CaTiO3.

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Explanation :

The compound pairs that would give a precipitate when their aqueous solutions are mixed are those that produce an insoluble compound when two solutions are mixed.

The correct answer for the question is option

A) CuBr2 and K2CO3.

What is a precipitate?

A solid product that is separated from a liquid reaction mixture is referred to as a precipitate.

During a chemical reaction in a solution, a precipitate may form when two aqueous solutions are mixed together.

The following pairs of compounds do not form a precipitate when their aqueous solutions are mixed:HNO3 and NH4INa2CO3 and H2SO4KCl and KNO3

What is an aqueous solution?

A liquid solvent, generally water, is used to dissolve one or more solutes in a solution, creating an aqueous solution. An aqueous solution is a solution in which the solvent is water. An aqueous solution is a water-based solution with a pH of 7 or greater.

Therefore, the compound pairs that would give a precipitate when their aqueous solutions are mixed are CuBr2 and K2CO3.

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Answer:

Question 4 is 291.0346

Explanation:

Answer:

Explanation:

7 carbon atoms, 6 hydrogen atoms,9 NO2 atoms

7+6+9=22

2(22)=44

44 atoms

Answer:

The part of the atom that is involved in bonding is Valence electrons.

d) stronger bases favor the E1 reaction statement about and E1 mechanism is not true

Ionization and deprotonation are typically the two stages involved in the E1 mechanism, also known as unimolecular elimination. The production of a carbocation occurs as an intermediate during ionisation. A proton is lost by the carbocation in deprotonation. SN1 and E1 Reactions have remarkably similar processes; the outcome just depends on whether the nucleophile or the base hits first. The pace of the reaction is solely dependent on the substrate in SN1/E1 reactions as opposed to second order SN2 and E2 reactions (see "SN2 Reactions" and "E2 Reactions").

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

Explanation:

Melting and boiling point variations are not clear (do not have uniform pattern) in periodic table. But we can see, some elements have higher melting and boiling points and some have less. Here we study melting and boiling points of s, p, d blocks elements. IVAth group elements (C,Si) show high melting and boiling points because they have covalent gigantic lattice structures.

To solve this problem, we need to use the principles of stoichiometry and combustion thermodynamics. The A/F ratio is the air-to-fuel ratio by mass, and it is defined as the mass of air required to completely combust one unit mass of fuel. The dew point temperature is the temperature at which the water vapor in the combustion products begins to condense, and it depends on the composition and temperature of the products.

The A/F ratio can be calculated as follows:

First, we need to write the balanced chemical equation for the combustion of ethane:

C2H6 + 3.5 O2 + (0.2 x 3.5) O2 -> 2 CO2 + 3 H2O + (0.2 x 3.5) N2

Here, the 3.5 O2 represents the stoichiometric amount of oxygen required to completely combust one unit mass of ethane, and the 0.2 x 3.5 O2 represents the excess oxygen supplied (20% excess air). The (0.2 x 3.5) N2 represents the corresponding amount of nitrogen in the excess air.

The molecular weights of the reactants and products are:

C2H6: 2 x 12.01 + 6 x 1.01 = 30.07 g/mol

O2: 2 x 16.00 = 32.00 g/mol

CO2: 1 x 12.01 + 2 x 16.00 = 44.01 g/mol

H2O: 2 x 1.01 + 16.00 = 18.02 g/mol

N2: 2 x 14.01 = 28.02 g/mol

Using these values, we can calculate the mass of air required to combust one unit mass of ethane:

A/F = (mass of O2 + mass of N2) / mass of C2H6

= [(3.5 x 32.00) + (0.2 x 3.5 x 28.02)] / 30.07

= 12.53

Therefore, the A/F ratio is 12.53 by mass.

To determine the dew point temperature of the products, we need to calculate the mole fractions of the water vapor and nitrogen in the products, and then use a psychrometric chart or equations to find the dew point temperature. Alternatively, we can use the following simplified equation:

Tdp = (243.12 x ln(RH/100) + 17.62 x T) / (17.62 - ln(RH/100) - T)

Here, Tdp is the dew point temperature in °C, RH is the relative humidity of the products, and T is the temperature of the products in °C.

Assuming the combustion products are initially at a temperature of 25°C and a relative humidity of 100% (i.e., the products are fully saturated with water vapor), we can calculate the mole fractions of the water vapor and nitrogen as follows:

Mole fraction of H2O = (n H2O) / (n H2O + n N2)

= (3 x 0.2) / [(3 x 0.2) + (3.5 x 0.2)]

= 0.3

Mole fraction of N2 = (n N2) / (n H2O + n N2)

= (3.5 x 0.2) / [(3 x 0.2) + (3.5 x 0.2)]

= 0.35

Using these values

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Answer:

The ocean is made up of salt water, which is a combination of fresh water, plus minerals collectively called "salts." These salts aren't just sodium and chloride (the elements that make up our table salt), but other minerals such as calcium, magnesium, and potassium, among others.

Explanation:The answer is since particles can be found in ocean water It is a compound, since it results from the combination of elements It is a solution

In order to determine the temperature on the X scale corresponding to 52.00 °Y, we need to establish the relationship between the two scales. Therefore, a temperature of 52.00 °Y corresponds to approximately 655.9 °X on the linear X temperature scale.

On the X scale, water freezes at −122.0 °X and boils at 321.0 °X, and on the Y scale, water freezes at −63.00 °Y and boils at −28.00 °Y, we can see that the temperature range on the Y scale is smaller than on the X scale.

On the X scale, the temperature range is 321.0 °X - (-122.0 °X) = 443.0 °X.

On the Y scale, the temperature range is -28.00 °Y - (-63.00 °Y) = 35.00 °Y.

In order to find the temperature on the X scale corresponding to 52.00 °Y, we can use a proportion: (52.00 °Y) / (35.00 °Y) = X / (443.0 °X).

X = (52.00 °Y) * (443.0 °X) / (35.00 °Y) = 655.9 °X.

Therefore, a temperature of 52.00 °Y corresponds to approximately 655.9 °X on the linear X temperature scale.

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The pH of a 200 ml solution having 0.365 g of dissolved HCl is 1.3.

pH is a measuring scale, which measures the acidity and basicity of a  solution. The scale is from 0 to 14. Acidic to basic. The less the pH means, it is acidic and the more the pH means, it is basic.

Number of moles HCl = grams / molar mass

the molar mass of HCl is 36.5

0.365 / 36.5 = 0.01 mols.

Molarity = M = mols/L

0.01 mol / 0.200 L = 0.05 M = (H⁺)

Then pH = -log(H⁺)

pH = -log (0.05)

PH = 1.30102

Thus, the pH of the solution is 1.3.

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