If a 500 ml sample of water contains 2.6 x 10-6 g of iron, what is the concentration of iron in ppb?
a. 5.2 ppb
b. 5.2 x 10-7 ppb
c. 5200 ppb
d. 5.2 x 10-3 ppb

The atmospheric sample contains nitrogen at 599 torr, oxygen at 154 torr, argon at 6 torr, and carbon dioxide. Assuming standard pressure, what is the partial pressure of carbon dioxide gas.

Given,P(N2) = 599 torrP(O2) = 154 torrP(Ar) = 6 torrP(CO2) = ?At standard pressure, P(total) = P(N2) + P(O2) + P(Ar) + P(CO2)P(total) = 1 atm = 760 torrP(CO2) = P(total) - P(N2) - P(O2) - P(Ar) = 760 - 599 - 154 - 6 = 1 torrTherefore, the partial pressure of carbon dioxide gas is 1 torr.Question 8) A sample of ammonia gas occupies 20.0 mL at 585 torr and 20.0 °C. If the volume of the gas is 50.0 mL at 50.0 °C, what is the pressure.

Given,V1 = 20.0 mLV2 = 50.0 mLT1 = 20.0 °C = 293 K (Kelvin temperature)T2 = 50.0 °C = 323 KVapor pressure of NH3 at 20.0 °C = 0.170 atmVapor pressure of NH3 at 50.0 °C = 0.623 atmUsing Charles's law,V1/T1 = V2/T2(20.0)/(293) = (50.0)/(323)20.0 × 323 = 50.0 × 29364.6 mL = 50.0 mLP1V1/T1 = P2V2/T2(585 torr)(20.0 mL)/(293 K) = P2(50.0 mL)/(323 K)P2 = (585 × 20.0 × 323)/(293 × 50.0)P2 = 424.2 torrTherefore, the pressure of the gas is 424.2 torr.

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Answer:

2.688 L

Explanation:

Here we use the formula:

(P1 x V1)/T1  =  (P2 x V2)/T2

where;

P1 = 417 mm of Hg

P2 = 576 mm of Hg

V1 = 4.78 L

V2 = X L

T1 = 497 K

T2 = 386 K

substituting the values in the formula:

(417 x 4.78)/497 = (576 x X)/386

1993.26/497  = 576X/386

(4.01058 x 386)/576 = X

2.688 L = X

The  new volume of the cylinder when pressure increases to 576 mm Hg

and temperature decreases to 386 K is 2.688 liters.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

Here we use the formula:

(P₁x V₁)/T₁ =  (P₂ x V₂)/T₂

where;P₁ = 417 mm of Hg,P₂ = 576 mm of Hg,V₁= 4.78 L,V₂= X L,T₁ = 497 K,T₂ = 386 K

substituting the values in the formula:

(417 x 4.78)/497 = (576 x X)/386

1993.26/497  = 576 X/386

(4.01058 x 386)/576 = X

2.688 L = X

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There are some thermometers that use alcohol instead of the mercury that is typically used. Alcohol has a lower freezing point (-114°C) than water (0°C), which is why we use it instead of water.

On the glass capillary tube, alcohol's vivid colour makes it simple to see.

Alcohol thermometer contents are less harmful and will evaporate more quickly than mercury in glass thermometer contents. The most popular variant is made of ethanol since it is inexpensive and has only a minimal risk of spillage.

What is thermometer?

A thermometer is a device used to gauge temperature. It can gauge the temperature of a solid substance like food, a liquid substance like water, or a gas substance like air. Celsius, Fahrenheit, and kelvin are the three most widely used units for measuring temperature.

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Answer:

Explanation:

Even if you have a Hotmail email address, you now use the Outlook.com interface to ... I searched and found a Hotmail support number, but is it legit? ... one from Leo's e-mail, I receive a message from windows stating it can't find the site.

Answer:

Explanation:

The molar mass of copper (II) nitrate is 187.5 g/mol.

To determine the mass of Mg(NO3)2 present in the solution, we need to use the formula: Mass = Volume × Concentration × Molar mass. The mass of Mg(NO3)2 present in 129 mL of a 0.450 M solution is approximately 8.613 grams.

Given: Volume of solution = 129 mL. Concentration of Mg(NO3)2 solution = 0.450 M. First, we need to convert the volume of the solution from milliliters (mL) to liters (L): 129 mL = 129/1000 L = 0.129 L. Next, we need to calculate the molar mass of Mg(NO3)2: Molar mass of Mg(NO3)2 = (1 × atomic mass of Mg) + (2 × atomic mass of N) + (6 × atomic mass of O) Molar mass of Mg(NO3)2 = (1 × 24.31 g/mol) + (2 × 14.01 g/mol) + (6 × 16.00 g/mol) Molar mass of Mg(NO3)2 = 148.31 g/mol Now, we can calculate the mass of Mg(NO3)2: Mass = Volume × Concentration × Molar mass Mass = 0.129 L × 0.450 M × 148.31 g/mol Mass = 8.613 g. Therefore, the mass of Mg(NO3)2 present in 129 mL of a 0.450 M solution is approximately 8.613 grams.

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Answer:

...are in constant motion

Explanation:

Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in and also the state of matter as well.

Answer:

However, as ocean acidification increases, available carbonate ions (CO32-) bond with excess hydrogen, resulting in fewer carbonate ions available for calcifying organisms to build and maintain their shells, skeletons, and other calcium carbonate structures.

Here are the answers

\(\\ \tt\hookrightarrow HCl+NaOH\longrightarrow NaCl+H_2O\)

\(\\ \tt\hookrightarrow H_2SO_4+2NaOH\longrightarrow Na_2SO_4+2H_2O\)

\(\\ \tt\hookrightarrow 2HCl+Ba (OH)_2\longrightarrow BaCl_2+2H_2O\)

Answer:

When the Tower formed around 50 million years ago, it was one to two miles below the Earth's surface. The harder igneous rock of the Tower is more resistant to erosion, and the gray columns of Devils Tower began to stand out above the surrounding landscape.

Explanation:

Octahedral type of hole will accommodate the most significant number of cations.

Octahedral voids are empty spaces that can be found in materials that have an octahedral crystal structure. It can be found in substances whose crystal structures have a tetrahedral shape. It can be found in compounds whose crystal structures have an octahedral shape.

When a molecule's core atom has four bonds and no lone pairs, the molecule is said to be tetrahedral. The four corners of a tetrahedron contain the atoms bound to the central atom, and there are 109.5° angles between them.

A lattice is an ordered collection of points that characterizes a crystal-forming particle's structure. The lattice points help identify a crystal's unit cell. In the sketched structure, every particle (yellow) is the same.

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1. Carbon-14: 14/6C
2. Uranium-235: 235/92U
3. Helium-4: 4/2He


The proper nuclear notation for an element includes the atomic number and mass number of the element. The atomic number represents the number of protons in the nucleus of the element, while the mass number represents the total number of protons and neutrons in the nucleus. Therefore, the notation for Carbon-14 would be 14/6C, as it has 6 protons and 8 neutrons. Similarly, Uranium-235 has 92 protons and 143 neutrons, giving it a notation of 235/92U. Helium-4, on the other hand, has 2 protons and 2 neutrons, giving it a notation of 4/2He.

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CH₃COOC₅H₁₁ is the chemical formula for an ester. The structure of CH₃COOC₅H₁₁ is attached.

Esters are organic compounds that are formed from a reaction between a carboxylic acid and an alcohol. The ester formed from the reaction between acetic acid (CH₃COOH) and pentanol (C₅H₁₁OH) is CH₃COOC₅H₁₁.

The ester has a carbonyl group, which is a carbon atom double-bonded to an oxygen atom, that is located in the middle of the molecule. The carbonyl group is attached to an acetyl group (CH₃CO), which is a combination of a methyl group (CH₃) and a carbonyl group. The other end of the molecule is attached to a pentyl group (C₅H₁₁), which is a chain of five carbon atoms with eleven hydrogen atoms attached.

Esters are commonly used as fragrances and flavorings, and can be found in a variety of fruits and flowers. They also have many industrial applications, such as in the production of plastics, resins, and solvents.

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The chemical equation for Direct Combination of Cobalt (III) and nitrogen, with the product given can be represented as given : Cobalt (III) + nitrogen → Cobalt nitride (Co3N2)When Cobalt (III) and nitrogen are combined using direct combination method, the product formed is Cobalt nitride (Co3N2).

The balanced chemical equation for this reaction is shown below.2 Co (III) + 3 N2 → Co3N2.Cobalt nitride is a blackish gray powder with a melting point of 1750 °C and a density of 6.5 g/cm3. Cobalt nitride is an important metal nitride that is used in the preparation of cobalt metal catalysts, magnetic alloys, and other materials.

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Molality is the number of moles of solute dissolved in 1000 g of the solvent (mol/kg). The formula for molality is as follows:Molality (m) = moles of solute / kilograms of solventHere are the steps to calculate the molality of a solution that has 14 g of dissolved CaO in 25 kg of water:1. Convert the mass of CaO to moles. The molar mass of CaO is 56.077 g/mol.14 g CaO × (1 mol CaO / 56.077 g CaO) = 0.2495 mol CaO2. Convert the mass of water to kilograms.25 kg of water × 1000 g/kg = 25,000 g of water3. Calculate the molality of the solution.molality (m) = 0.2495 mol / 25 kg= 0.00998 mol/kgThe molality of the solution is 0.00998 mol/kg.

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Answer:

H - Cl2 +NaBr -> Br2+2NaCl

Answer:

Option 4

Explanation:

Answer:

A. A vast area of relatively flat land that has only small changes in elevation

This titration involves adding 50.00 ml of 0.125 M HBr (strong acid) to 0.200 M NaOH. (strong base). The Correct option is A

When the amount of acid added equals the amount of base added, the equivalence point is reached. According to the reaction's stoichiometry, this happens when 31.25 ml of NaOH have been added.

We use the fact that HBr is a strong acid, which implies that it totally dissociates in water to create H+ ions and Br- ions, to determine the pH at different volumes of NaOH supplied. Only the HBr is present at 0.00 ml of NaOH applied, hence the pH may be determined using the initial concentration of H+. We must use the amount of HBr that hasn't been completely neutralised after 10.0 ml of NaOH have been introduced in order to determine the concentration of H+ ions.

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Time taken by students of different ages to finish the same puzzle is an independent variable whereas the amount of coffee grounds that affect the taste is a dependent variable.

One of the most important aspects of scientific study is establishing the cause and effect relationships. Knowing which variable is the cause, or independent variable, and which is the effect, or dependent variable, is crucial. Here time taken by students of different ages to finish the same puzzle differs for each student and each student's time taken is independent of other, so it is a independent variable. But the taste of coffee is an effect which depends on the amount of coffee grounds used, so it is a dependent variable

Time taken by students of different ages to finish the same puzzle is an independent variable whereas the amount of coffee grounds that affect the taste is a dependent variable.

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Answer:

Theoretical yield = 0.24 gram (Approx)

Explanation:

Given:

Butan-2-1

Molar mass(butan-2-ol) = 74.12 g/mol

Molar mass(butan-2-one) = 72.11 g/mol

Density of butan = 0.806 g/mol

Volume = 0.30 ml

Computation:

Mass of 2-butan = Density of butan × volume

Mass of 2-butan = 0.806 g/mol × 0.30 ml

Mass of 2-butan = 0.2418 g

Mass of product = Mass of 2-butan × [1 mol of butan-2-ol / 74.12] × [1 mol of butan-2-one / 1 mol of butan-2-ol] × [72.11 g/mol / 1 mol of butan-2-one]

Mass of product = 0.235 gram

Theoretical yield = 0.24 gram (Approx)

Answer:

0.327214 mol

Explanation:

45.5/278.106=0.163607

Then, 0.163607x2= 0.327214

The limiting reactant is potassium aluminum sulfate.

To determine the limiting reactant, we need to compare the amount of each reactant to the stoichiometry of the balanced chemical equation. The balanced equation for the reaction between ammonium hydroxide (NH4OH) and potassium aluminum sulfate (KAl(SO4)2) is:

2 NH4OH + KAl(SO4)2 -> Al(OH)3 + (NH4)2SO4 + K2SO4

From the equation, we can see that the stoichiometric ratio between ammonium hydroxide and potassium aluminum sulfate is 2:1. Therefore, we need twice as many moles of ammonium hydroxide as potassium aluminum sulfate.

To calculate the moles of each reactant, we use the formula:

moles = concentration (M) × volume (L)

For the ammonium hydroxide:

moles of NH4OH = 3.0 M × 0.100 L = 0.300 mol

For the potassium aluminum sulfate:

moles of KAl(SO4)2 = mass (g) / molar mass (g/mol)

moles of KAl(SO4)2 = 30.0 g / (39.1 g/mol + 26.98 g/mol + 2(32.1 g/mol) + 4(16.0 g/mol)) = 0.083 mol

Since the stoichiometric ratio is 2:1, the moles of ammonium hydroxide are in excess.

To determine the theoretical yield of aluminum hydroxide (Al(OH)3), we need to convert the moles of the limiting reactant (potassium aluminum sulfate) to moles of the product using the stoichiometry of the balanced equation. From the balanced equation, we can see that the stoichiometric ratio between potassium aluminum sulfate and aluminum hydroxide is 1:1.The moles of aluminum hydroxide produced will be the same as the moles of potassium aluminum sulfate used, which is 0.083 mol.

To calculate the theoretical yield in grams, we use the formula:

mass = moles × molar mass

The molar mass of aluminum hydroxide (Al(OH)3) is (26.98 g/mol + 3(16.0 g/mol)) = 78.0 g/mol.

The theoretical yield of aluminum hydroxide is:

mass = 0.083 mol × 78.0 g/mol = 6.474 g

Therefore, the theoretical yield of aluminum hydroxide is 6.474 grams.

Aluminum hydroxide is a precipitate, which means it forms solid particles when the reaction occurs. It can be collected on a filter paper using a filtration process. Filtration is a common method to separate solids from liquids. The reaction mixture can be poured through a filter paper funnel, and the solid aluminum hydroxide particles will be trapped on the filter paper while the liquid and soluble salts (such as ammonium sulfate and potassium sulfate) pass through.However, it's important to note that the success of the filtration process depends on the particle size and the nature of the solid precipitate. If the particles of aluminum hydroxide are too fine or colloidal in nature, they may pass through the filter paper and affect the efficiency of the filtration. In such cases, additional techniques like centrifugation or using a finer filter may be required to achieve better separation.

Overall, collecting aluminum hydroxide on a filter paper is a feasible method in this scenario, provided the precipitate is of the appropriate size and nature for filtration.

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When comparing a highly liquidity bond with a comparable but less liquid bond, the highly liquidity bond is most apt to have a lower yield.

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Answer:

Since previous studies had shown that the brain's visual center lights up with activity when someone does a purely smell-related task, a group of researchers set out to test what these two senses have to do with each other. ... The electric current startles that area of the brain into extra activity.