Gold is one of the densest substances known, with a density of 19. 3 g/cm^3. If the gold in the crown was mixed with a less-valuable metal like bronze or copper. How would that affect its density?

The amount, in grams, of \(Fe_2O_3\) formed from 16.7 g of Fe and oxygen would be 23.856 grams.

Iron (Fe) combines with oxygen (O2) to form Fe2O3 according to the following equation:

\(4Fe + 3O_2 --- > 2Fe_2O_3\)

Mole equivalence of 16.7 g of Fe = 16.7/56 = 0.2982 mol

From the balanced equation of the reaction, the mole ratio of Fe and Fe2O3 is 2:1, thus, the equivalent mole of Fe2O3 produced from 0.2982 mol of Fe would be:

   0.2982/2 = 0.1491 mol

Mass of 0.1491 mol Fe2O3 = 0.1491 x 160

                                            = 23.856 grams

In other words, the amount of Fe2O3 formed is 23.856 grams.

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The balanced equation for the combustion of butane with the smallest whole numbers possible is:

2C4H10 + 13 O2 → 8 CO2 + 10 H2O.

Note that this equation is balanced because there are an equal number of atoms of each element on both sides of the equation.

The balanced equation for the combustion of butane with the smallest whole numbers possible is:

C4H10 + 13/2 O2 → 4 CO2 + 5 H2O.

However, since we need whole numbers, we can multiply the entire equation by 2 to achieve this:

2(C4H10) + 13(O2) → 8(CO2) + 10(H2O)

So, the final balanced equation with whole numbers is:

2C4H10 + 13O2 → 8CO2 + 10H2O

The equation shows that when two molecules of butane (C4H10) react with 13 molecules of oxygen (O2), they produce eight molecules of carbon dioxide (CO2) and 10 molecules of water (H2O).

The coefficients in front of each compound represent the number of molecules involved in the reaction.

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We can see from the calculation of the number of moles of the neon that we are going to have about  2.2 moles

The mole is a unit of measurement for substance amounts in chemistry. One mole is the volume of a substance that contains the same number of elementary particles as there are in 12 grams of carbon-12. These particles can be atoms, molecules, ions, or electrons. Avogadro's number, or about 6.022 x 1023 particles per mole, is the quantity of things.

We know that;

1 mole of the Ne occupies 22.4 L

x moles will occupy 48.41L

x = 2.2 moles

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Answer:

it changes from potential to kinetic

Explanation:

the coals are at rest and when a force acts upon it which makes it move from one position to another

Using the distribution coefficient, we can calculate the masses removed from water: a) 45.8 g; b) 48.8 g.

If the distribution coefficient between DCM (methylene chloride) and water is 11, that means that the concentration in DCM is 11 times greater than the concentration in water.

a) When equal volumes of the solvents are used, the amount of the solute in DCM (A) will be 11 times greater than the amount of solute remaining in water (B).

A + B = 50.0 g

A = 11 B

11 B + B = 50.0 g

12 B = 50.0 g

B = 50.0 g / 12

B = 4.17 g

A = 11 * 4.2 g

A = 45.8 g

b) Because the solvent volumes are not the same, we have to use concentrations. We can still label the mass of Y in DCM as A, and the mass of Y in water as B. After a single extraction with 125 mL of DCM we get:

A₁ + B₁ = 50.0 g

(A₁ / 125 mL) / (B₁ / 250 mL) = 11

2 A₁ / B₁ = 11

A₁ = 11 B₁ / 2

A₁ = 5.5 B₁

5.5 B₁ + B₁ = 50.0 g

6.5 B₁ = 50.0 g

B₁ = 50.0 g / 6.5

B₁ = 7.7 g

So, after the first extraction, 7.7 g of Y has remained in water. That means that for the second extraction:

A₂ + B₂ = 7.7 g

A₂= 5.5 B₂

5.5 B₂ + B₂ = 7.7 g

6.5 B₂ = 7.7 g

B₁ = 7.7 g / 6.5

B₁ = 1.2 g

After the second extraction, only 1.2 g of Y has remained in water, while 50.0 g - 1.2 g = 48.8 g of Y was removed from water.

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To keep burning, fires require oxygen. Carbon dioxide is used in certain fire extinguishers to put out flames. Explanation: Because magnesium is higher on the reactivity scale than carbon, it is more reactive and eliminates oxygen from carbon dioxide (to give carbon and magnesium oxide).

Answer: it definitely did help me a lot but sometimes it doesn’t make me happy like i will get stressed but it passes.

Explanation:

Answer:

Im assuming a glass of water

Explanation:

there is less water that needs to be heated up

Answer:

Hydrogen, 0,2 mol

Explanation:

\(V_{M}\) = 22, 4 l/mol

V (\(N_{2}\)) = 6,72 \(dm^{2}\) = 6,72 l

V (\(H_{2}\)) = 6,72 \(dm^{2}\) = 6,72 l

The formula is:

n = \(\frac{V}{V_{M} }\)

n  (\(N_{2}\)) = 6,72l /22,4 l/mol = 0,3 mol

n  (\(H_{2}\)) = 6,72l /22,4 l/mol = 0,3 mol (the same)

But from the equation we get a proportion that 1 mol  (\(N_{2}\)) - 3 mol (\(H_{2}\))

\(\frac{0,3}{1} > \frac{0,3}{3}\) (we have more hydrogen than is need for the reaction)

So there is excess of \(H_{2}\)

We only need  \(\frac{0,3}{3}\) = 0,1 mol (\(H_{2}\))

0,3 mol (hydrogen quantity we have) - 0,1 mol (hydrogen quantity we need for the reaction) = 0,2 mol (excess)

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The stabilization and destabilization of octahedral complexes refer to the changes in the energy levels of d-orbitals in transition metal complexes, which affects their properties and reactivity.

In octahedral complexes, the d-orbitals of the central metal ion split into two sets of energy levels due to the presence of ligands. This is known as crystal field splitting. The energy gap between these sets is determined by the strength of the ligand field, which is related to the nature of the ligands and the geometry of the complex.
Stabilization occurs when the ligand field is strong, causing a large energy gap between the two sets of orbitals (t2g and eg). This leads to lower energy and more stable complexes. Examples of strong ligands that cause stabilization include CN-, CO, and NO2-.
Destabilization, on the other hand, occurs when the ligand field is weak, causing a smaller energy gap between the sets of orbitals. This leads to higher energy and less stable complexes. Examples of weak ligands that cause destabilization include I-, Br-, and Cl-.
In summary, the stabilization and destabilization of octahedral complexes are determined by the ligand field strength and the resulting energy gap between the d-orbitals, affecting the properties and reactivity of the complexes.

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Answer:

250 kg•m/s

Explanation:

momentum = mass × velocity

= 50 × 5

= 250 kg•m/s

hope it's correct

Answer:

A. physical change

b. physical change

c. chemical change

d. chemical change

The answer is 1.25e-8.

Hydrogen bonds are the intermolecular forces responsible for the production of water dimers.

Between molecules, intermolecular forces are at work. In contrast, molecules themselves exert intramolecular pressures. In comparison to intramolecular forces, intermolecular forces are weaker. The London dispersion forces, dipole-dipole interactions, ion-dipole interaction, & van der Waals forces are a few examples of intermolecular forces.

The equilibrium between the intermolecular interactions and a kinetic energy of a specific particles (atoms or molecules) determines the state of a material. The kinetic energy, which is dependent on the substance's temperature, maintains the molecules separated and in motion.

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Answer:    

Darwin observed   many  different   types of mockingbirds and finches lived in different island environments.

It's O2 which is oxygen....

Answer:

Explanation:

Hope this helps you. Please mark as brainliest. Good Luck^_^

Answer: The answer is 6  

1) Simplify  -3+6  to  3.

2×3

And then Simplify.

6

Sorry if im wrong

Explanation:

7.2×1024 moleas

please mark as brilliant

The photoelectrons' kinetic energy increased with an increase in light frequency, and the current increased with a rise in light amplitude.

What is demonstrated by the photoelectric effect?

The current increased with a rise in light amplitude, and the kinetic energy of the photoelectrons increased with a rise in light frequency.

What does the photoelectric effect prove?

Light can be categorised as a wave because it demonstrates all three of the essential features of a wave—interference, diffraction, and polarisation.

The photoelectric effect, however, only makes sense if we consider light to be made up of tiny energy packets (particles) known as photons; in other words, the photoelectric effect proves that light is a particle.

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Answer:

low melting point, high density, and acid resistance

Explanation:

Answer:

They require diffrent types of atoms for their makeup I belive is the answer Hope this helps

Explanation: Wow you have a lot a questions XD :D :3

Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties.

i hope this helps

When gasoline evaporates from a fuel gas can energy is released. Therefore, the correct option is option A.

Energy, which is observable in the execution of labour as well as through the emission of heat and light, is the quantitative quality which gets transmitted to a body as well as to a physical system in physics. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.  When gasoline evaporates from a fuel gas can energy is released.

Therefore, the correct option is option A.

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To determine the number of grams of NH4Br needed to prepare an aqueous solution at a specific pH,

follow these steps:

1. Write the balanced chemical equation for the dissociation of NH4Br in water:
  NH4Br (aq) ⇌ NH4+ (aq) + Br- (aq)

2. Construct an ICE table:
  Initial:
     [NH4Br] = x
     [NH4+] = 0
     [Br-] = 0

  Change:
     [NH4Br] = -x
     [NH4+] = +x
     [Br-] = +x

  Equilibrium:
     [NH4Br] = 0
     [NH4+] = x
     [Br-] = x

3. Write the equilibrium constant expression for Ka, the acid dissociation constant of NH4+:
  Ka = [H+][NH3] / [NH4+]

4. Calculate the initial concentration of NH4+ based on the desired pH (use the formula pH = -log10[H+]):
  [H+] = 10^(-pH)
  [NH4+] = x

5. Substitute the equilibrium concentrations into the Ka expression and solve for x:
  Ka = [H+][NH3] / [NH4+]

6. Calculate the initial moles of NH4Br using the value of x:
  moles NH4Br = x * total volume of the solution

7. Determine the mass of NH4Br by multiplying the moles by its molar mass (NH4Br = 97.94 g/mol):
  mass NH4Br = moles NH4Br * molar mass of NH4Br

The number of grams of NH4Br needed to prepare the aqueous solution at the specific pH is equal to the calculated mass of NH4Br in step 7.

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Answer:

r

I think 1 option okkkkkkkkkkkkk

Explanation:

mhfs4trfsetc fthcfeencfgeh,cbwjh vbytbnmdtuh3lg dl5flnfwk3t kqre,fvbt,klkkkjh

The pH of the cathode compartment solution is 2.73.. To calculate the pH of the cathode compartment solution, we need to use the Nernst equation. First, we need to write the balanced equation for the cell reaction, which is:

Zn(s) + H2(g) → Zn^2+(aq) + 2H+(aq)

The cell potential at 298 K is measured to be 0.670 V, which means that:

Ecell = Ecathode - Eanode

where Eanode is zero for the Zn(s) electrode. Therefore:

Ecathode = 0.670 V

Now we can use the Nernst equation to calculate the cathode compartment potential:

E = E° - (RT/nF) ln(Q)

where E° is the standard electrode potential, R is the gas constant, T is the temperature in Kelvin, n is the number of electrons transferred in the reaction, F is the Faraday constant, and Q is the reaction quotient. For the cathode compartment, the Nernst equation becomes:

Ecathode = E°cathode - (RT/2F) ln([Zn^2+]/([H+]^2/pH2))

where [Zn^2+] is the concentration of Zn^2+ ions, [H+] is the concentration of H+ ions, and pH2 is the partial pressure of H2 gas.

Rearranging the equation and solving for [H+], we get:

[H+] = (pH2/2) * ([Zn^2+]/Kc)^(1/2)

where Kc is the equilibrium constant for the reaction, which is equal to 10^-6.6 at 298 K.

Plugging in the values given, we get:

[H+] = (0.96/2) * (0.22/10^-6.6)^(1/2) = 1.87 x 10^-3 M

Finally, we can calculate the pH of the cathode compartment solution using the equation:

pH = -log[H+] = 2.73

Therefore, the pH of the cathode compartment solution is 2.73.

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Answer:

Explanation:

The acceptable range of mass when you are asked to obtain 3.000g of NaCl would typically be within a certain margin of error, usually +/- 0.001g or 0.1%. This range represents the precision of the measurement. It is an indication of the degree of accuracy with which the measurement was made.

When requested to obtain 3.000g of NaCl, the acceptable range of mass would normally be 0.001g. The accuracy of the measurement is represented by this range.

This range denotes the measurement's accuracy, which is a gauge of how easily the findings may be repeated. The greatest variation from the goal mass of 3.000g that is deemed acceptable is 0.001g. The measurement is more accurate the lower the deviation. Depending on the goal of the experiment, the precision of the balance utilised, and the method's sensitivity, this precision need could change. A accuracy of 0.001g is often regarded as satisfactory for the majority of laboratory applications. When working with extremely reactive or dangerous compounds or for more important applications, an accuracy of 0.0001g or less can be necessary.

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The approximate hardness of the resulting steel in GPa is 7.7 GPa.

6150 steel (0.5%C) cooled from 1000°C and isothermally treated at 650°C for 10 s then quenched to room temperature. Prior to heating, it was normalized and had a hardness of 1.8 GPa. We need to find the approximate hardness of the resulting steel in GPa.

After normalizing, the steel is cooled from 1000°C to 650°C, which means it is cooled to the austenitic temperature range, which changes its microstructure. At this temperature, the steel has pearlite microstructure.

Pearlite is an alloy of ferrite and cementite phases. As the steel is isothermally treated at 650°C, it means that the pearlite phase of the steel has completely transformed into the austenite phase. Therefore, after the quenching process, the steel will have martensite microstructure.

The hardness of the martensite is related to the carbon content of the steel.

After cooling from 1000°C to 650°C, the steel microstructure changes, which means its carbon content also changes. We can see from the Fe-C phase diagram that at 650°C, the steel's carbon content is approximately 0.2% to 0.3%. We are given that the steel has 0.5% carbon content before the process, which means its carbon content has reduced.

We can assume that the carbon content in the steel after quenching will be about 0.3%. From the given diagram, the approximate hardness of the steel will be 7.7 GPa.

Therefore, the approximate hardness of the resulting steel in GPa is 7.7 GPa.

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Arsenic, hydraulic fracturing, lead, and PFAS present chemical threats to global drinking water supplies in different ways.

Let's discuss each of them in detail:

(a) Arsenic - The origin of arsenic exposure is natural deposits or contamination from agricultural or industrial practices. Human health consequences include skin, lung, liver, and bladder cancers. It can also lead to cardiovascular diseases, skin lesions, and neurodevelopmental effects. Drivers of continued exposure include poor regulation and monitoring. Modern solutions include rainwater harvesting and treatment.

(b) Hydraulic fracturing - Hydraulic fracturing involves using a mixture of chemicals, water, and sand to extract natural gas and oil from shale rock formations. The origin of exposure is contaminated surface and groundwater due to the release of chemicals from fracking fluids and other sources. Human health consequences include skin, eye, and respiratory irritation, headaches, dizziness, and reproductive and developmental problems. Drivers of continued exposure include lack of regulation and poor oversight. Modern solutions include alternative energy sources and regulation of the industry.

(c) Lead - Lead contamination in drinking water can occur due to corrosion of plumbing materials. Human health consequences include neurological damage, developmental delays, anemia, and hypertension. Drivers of continued exposure include aging infrastructure and poor maintenance. Modern solutions include replacing lead service lines, testing for lead levels, and implementing corrosion control.

(d) PFAS - PFAS (per- and polyfluoroalkyl substances) are human-made chemicals used in a variety of consumer and industrial products. They can enter the water supply through wastewater discharges, firefighting foams, and other sources. Human health consequences include developmental effects, immune system damage, cancer, and thyroid hormone disruption. Drivers of continued exposure include the continued use of PFAS in consumer and industrial products. Modern solutions include reducing the use of PFAS in products and treatment methods such as granular activated carbon.

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The correct ranking of the gases Kr , N₂ , CH₄ , and C₃H₈ in order of increasing density at STP is: CH₄ < N₂ < Kr < C₃H₈.

This is because at STP (standard temperature and pressure), gases behave similarly to ideal gases, which means their densities are proportional to their molar masses. The molar mass of each gas is:

- CH₄: 16.04 g/mol
- N₂: 28.01 g/mol
- Kr: 83.80 g/mol
- C₃H₈: 44.10 g/mol

So, the gas with the lowest molar mass (CH₄) has the lowest density, followed by N₂, Kr, and C₃H₈ with the highest density. Therefore, the correct ranking of these gases in order of increasing density at STP is: CH₄ < N₂ < Kr < C₃H₈.

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