The density of gold 19.3g/cm3. if a sample of pure gold has a mass of 65.4g, what is the volume?

Answer:

it's definitely a oxidation reaction because here the oxygen contained OH group present in yeild

Ag2CO3(s) ⇌ 2Ag+(aq) + CO32-(aq)Given, the solubility of Ag2CO3 in water at 25 °C is 0.035g/L.

We are to calculate Ksp for Ag2CO3. The expression for Ksp of Ag2CO3 is given as:Ksp = [Ag+]²[CO32-]To calculate Ksp we need to find the concentration of Ag+ and CO32- ions.The molar mass of Ag2CO3 is 275.75 g/mol.Therefore, 0.035 g/L of Ag2CO3 is equivalent to (0.035/275.75) moles/L.

Concentration of Ag+ ion = 2 × (0.035/275.75) = 0.000254 mol/LConcentration of CO32- ion = (0.035/275.75) = 0.000127 mol/L. Substituting these values in the expression for Ksp we get,Ksp = [Ag+]²[CO32-]= (0.000254)²(0.000127) = 8.15 × 10⁻⁶ ≈ 8.2 × 10⁻⁶ rounded to two significant figures.Therefore, the Ksp for Ag2CO3 is 8.2 × 10⁻⁶.

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Lowering the temperature and increasing the pressure of the solution would generally result in a solid coming out of a solution through crystallization.

Crystallization is a process in which a solid forms from a solution by the arrangement of particles into a regular, repeating pattern. Here are the steps involved:

1. Dissolving: Initially, a solute is dissolved in a solvent to form a solution. The solute particles are dispersed and surrounded by the solvent molecules.

2. Saturation: The solution is then brought to a state of saturation by adding more solute or removing the solvent, such that no more solute can dissolve. At this point, the solution contains a high concentration of the solute.

3. Nucleation: When the solution becomes saturated, it becomes unstable, and the solute molecules start to come together and form tiny clusters or nuclei. These nuclei serve as the starting points for crystal growth.

4. Crystal Growth: Once the nuclei form, they start growing as more solute particles join the crystal lattice. This growth occurs by the addition of solute molecules from the solution onto the existing crystal surface.

Now, let's look at how temperature and pressure affect this process:

- Lowering the temperature: Decreasing the temperature of the solution slows down the movement of solute molecules, reducing their kinetic energy. This leads to a decrease in solubility, meaning less solute can remain dissolved in the solution. As a result, excess solute comes out of the solution and starts forming crystals.

- Increasing the pressure: When the pressure of the solution is increased, it compresses the solvent and alters its properties. This compression can enhance the solubility of the solute, allowing it to dissolve more effectively. Consequently, increasing pressure generally inhibits crystallization as more solute remains dissolved in the solution.

Therefore, lowering the temperature favors crystallization by decreasing solubility, while increasing the pressure generally inhibits crystallization by increasing solubility.

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Answer:

the fossils on some of the continents were in the same spots as fossils on other continents

Explanation:

tell me if i need to explain more. x

Answer:

Chemical equations are a shorthand method of representing chemical reactions. In a chemical reaction the reactants (what you start with) are converted into products (what you end with). The reactants, which are shown on the left hand side of an equation, and the products, which are shown of the right, are separated by an arrow. The equation below represents the reaction of carbon with oxygen gas to form carbon dioxide.

Explanation:

Notice that the number of atoms of carbon is the same on both sides of the arrow. There is one carbon atom on the reactant side and one carbon atom on the product side. The same is true for oxygen except that there are two oxygen atoms on each side (remember that the subscript of two in the oxygen molecule means that there are two oxygen atoms bonded together). When the number of atoms on each side of the equation are equal, the equation is said to be balanced. A balanced equation is in agreement with the Law of Conservation of Matter which states that matter is neither created nor destroyed during a chemical reaction.

An exothermic process called combustion necessitates the interaction of fuel with a reducing agent.

An object quickly reacts with oxygen in the chemical process of burning to produce heat. Fuel and oxygen's source are the terms used to describe the original substance. Although fuel for aeroplane propulsion is normally a liquid, it can also be a solid, liquid, or gas.

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Total, 9.11 liters of hydrogen gas at STP are required to produce 7.85 g of H₂O.

The chemical equation for a reaction between hydrogen gas (H₂) as well as oxygen gas (O₂) to form water (H₂O) is;

2H₂ + O₂ → 2H₂O

This balanced chemical equation tells us that 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce 2 moles of water.

We can use the molar mass of water to convert the given mass of H₂O to moles;

molar mass of H₂O = 2(1.008 g/mol) + 15.999 g/mol = 18.015 g/mol

7.85 g H₂O / 18.015 g/mol = 0.435 mol H₂O

Since 2 moles of H₂O are produced for every 2 moles of H₂, we know that 0.435 mol H₂O requires 0.435 mol H₂.

Now, we can use the ideal gas law to calculate the volume of H₂ gas at standard temperature and pressure (STP) required to contain 0.435 mol of H₂;

PV = nRT

where P = pressure (at STP, P = 1 atm), V = volume, n = number of moles, R = the ideal gas constant (0.08206 L·atm/mol·K), and T = temperature (at STP, T = 273 K).

Rearranging the equation to solve for V;

V = nRT/P = (0.435 mol) x (0.08206 L·atm/mol·K) x (273 K) / (1 atm) = 9.11 L

Therefore, 9.11 liters of H₂ gas at STP are required to produce 7.85 g of H₂O.

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The number of the chloride ions are there in the 7.50 mol of the aluminum chloride is 1.35 × 10²⁵ chloride ions. The correct option is D.

The formula for the aluminum chloride = AlCl₃

The number of the moles of the aluminum chloride = 7.50 mol

The number of the chloride ions in the aluminum chloride = 3 mol

The number of the chloride ions in the aluminum chloride = 3 × 7.5 mol

The number of the chloride ions in the aluminum chloride = 22.5 mol

The number of moles of the substance = 6.023 × 10²³ ions

The chloride ions are in the 7.50 mol of aluminum chloride = 22.5 × 6.023 × 10²³

The chloride ions are in the 7.50 mol of aluminum chloride = 1.35 × 10²⁵ chloride ions. The option D is correct.

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Answer:

6 Atoms

Explanation:

Li has 3 atom

O has 1 atom

H has 2 atoms

:)

We can now calculate the energy in Joules contained in a single photon of green signal with a wavelength of 535 nm. E=hv=h⋅cλ.

The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is expressed as cycles a second (Hz), which is the quantity of vibrations that cross a specific area inside a second (Hertz).

A waveforms signals that is carried in space via down a wire has a wavelength, which is the separation between two identical places (adjacent crests) inside the consecutive cycles. This length is typically defined in wireless communication systems in metres (m), centimetres (cm), and millimetres (mm) (mm).

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I wrote, The platinum electrode is the cathode in this reaction. The tin electrode is the anode in this reaction. In the half reactions that occur the nitrate is reduced to nitric oxide(NO) while the tin electrode is oxidized to Sn2+.

Oxidation occurs at the tin half cell(anode) while reduction occurs at the nitrate half cell(cathode).

A galvanic cell refers to a cell that produces electrical energy spontaneously by redox reaction. Oxidation occurs at the anode while reduction occurs at the cathode in a galvanic cell.

The oxidation half equation at the anode occurs as follows;

3Sn(s) → 3Sn^2+(aq) + 6e

The reduction half equation that occurs at the cathode is;

2NO3–(aq) + 8H+(aq) + 6e→  2NO(g) + 4H2O(l)

We can see that electron loss occurs at the cathode while electron gain occurs at the anode as we can see in the equations above.

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They are classified on the basis of their physical features- Shape and Appearance.

The four basic shapes of bacteria are Coccus (spherical or ovoid), bacillus (rod-like), vibrio (comma-shaped ), and spirilla (spiral or helical shaped).

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♪ ♫ Hope this helps :D

Answer

F) The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.

Explanation

Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. He discovered that doubling the pressure of an enclosed sample of gas, while keeping its temperature constant, caused the volume of the gas to be reduced by half.

Answer: The water will taste sour.

Explanation:

Answer: D. The water will taste sour (Edmentum)

Explanation:

The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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Answer:

coastline

Explanation:

Answer:

coastline

Explanation:

The solution can be determined by using stoichiometry principle. The mass of nitrogen required to make 9 kg of nitric acid is 2.8539 kg

The stoichiometry of both step of the reaction:

\(N_{\\2}\) + 3\(H_{2}\) ⇒ 2 \(NH_{3}\) , this 1st step have 96% yield

 \(NH_{3}\) + 2 \(O_{2}\) = \(HNO_{3}\) , this 2nd step have 73% yield

Molecule weigh of:

\(N_{\\2}\) = 28 gram/mole

\(H_{2}\) = 2 gram/mole

\(NH_{3}\) = 17 gram/mole

\(O_{2}\) = 32 gram/mole

\(HNO_{3}\) = 63 gram/mole

Calculate mole of 9kg of nitric acid

9000 gram / 63 gram/mole = 142.8571 mole

With 73% yield from 2nd reaction, mole of    \(NH_{3}\) are:

142.8571 x 100/73 = 195.6947 mole

With 96% yield from 1st reaction, mole of \(N_{\\2}\) are:

195.6947/2 x 100/96 = 101.9243 mole

mass of \(N_{\\2}\) needed are:

101.9243 mole x 28 gram/mole = 2,853.8804 gram = 2.8539 kg

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As a result, the material with the lowest boiling point will have the maximum vapor pressure at ambient temperature. The material with the lowest vapor pressure is that which has the greatest boiling point.

What variables influence vapor pressure?

Vapor pressure is the name given to the force produced when liquids evaporate. Three factors that typically affect vapor press performance are surface area, intermolecular forces, and temperature. Molecules have variable vapor pressures depending on their temperature.

What is vapour pressure, for instance?

It is essential to remember that a liquid's vapor pressure is equal to the atmospheric pressure while it is boiling. For instance, water's vapor pressure when it boils at sea level is 1 atmosphere since the surrounding pressure is also 1 atmosphere.

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None of the given options is entirely correct.

With paper chromatography, mixtures of substances are separated according to how well they dissolve in a solvent and how well they stick to the paper's fibers.

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The balanced chemical equation for the combustion of liquid hexane in oxygen gas is: C6H14(l) + 19O2(g) -> 6CO2(g) + 14H2O(g)

In this equation, hexane (C6H14) is a liquid reactant and oxygen gas (O2) is a gaseous reactant. The products, carbon dioxide (CO2) and water vapor (H2O), are both in the gaseous state. To balance the equation, the coefficient 19 was used for the oxygen gas to ensure that the number of oxygen atoms in the reactants and products is equal. Similarly, the coefficients 6 and 14 were used for the carbon dioxide and water vapor, respectively, to balance the number of carbon and hydrogen atoms in the equation.

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Answer:

Zacharias Janssen

Explanation:

Zacharias Janssen is known as the man who invented the compound microscope which is widely used today by most scientists all over the world.

The compound microscope was built in the 16th century during this period eyeglasses were just being introduceed to people all around.

Zacharias Jensen achieved this great feat with the help of his father Hans who was also anther great scientist, he mentored his son throughout the years and gave him the necessary skills and knowledge to produce the compound microscope.

The value of the Keq for decomposition reaction of BrCl at 298 K is 0.8.

The decomposition reaction of BrCl can be written as follows;

BrCl(g) ⇌ Br(g) + Cl(g)

Equilibrium constant expression for this reaction is;

\(K_{eq}\) = [Br(g)][Cl(g)] / [BrCl(g)]

After the system we reached at equilibrium, 42% of the original BrCl sample has been decomposed. This means that the concentration of BrCl at equilibrium is 58% of its original concentration. Let's assume that the initial concentration of BrCl is "x". Then, at equilibrium, the concentration of BrCl is 0.58x.

The concentration of Br and Cl at equilibrium is equal to the concentration of BrCl that decomposed. Since the stoichiometric coefficients of Br as well as Cl in balanced equation are both 1, their concentrations are also 0.58x.

Now we can substitute equilibrium concentrations into the equilibrium constant expression and solve for \(K_{eq}\);

\(K_{eq}\) = [Br][Cl] / [BrCl]

\(K_{eq}\) = (0.58x)(0.58x) / (x - 0.58x)

\(K_{eq}\) = 0.336x / 0.42x

\(K_{eq}\) = 0.8

Therefore, the value of Keq is 0.8.

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Answer:

The correct answer is Na2CO3. 10H2O

Animal cells have cell membranes and mitochondria, but only plant cells have cell walls.

A sample of gas has an initial volume of 3.50 l at a pressure of 970. torr and a temperature of 25 oc. if the sample is heated to a temperature of 40. oc and expands to a volume of 6.80 l, The final pressure of the gas sample is 1306.6 torr.

To solve this problem, we can use the combined gas law, which states:
(P1 x V1) / T1 = (P2 x V2) / T2
Where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.
Plugging in the given values, we get:
(970 torr x 3.50 L) / (25 + 273.15 K) = (P2 x 6.80 L) / (40 + 273.15 K)
Simplifying and solving for P2, we get:
P2 = (970 torr x 3.50 L x (40 + 273.15 K)) / (25 + 273.15 K) / 6.80 L
P2 = 1306.6 torr
Therefore, the final pressure of the gas sample is 1306.6 torr.

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Answer:

Photosynthesis

Explanation: