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Cu will be produced at the negative electrode for the following reaction:

2CuSO4 (a q) + 2H20 (1) -> 2Cu(s) + 2H2SO4(l) + O2(g) ,therefore option (b) is correct.

Electrolysis is defined as a process of decomposing ionic compounds into their elements by passing a direct electric current through the compound in a molten  form.

Characteristics of negative electrode -:

The negative electrode in an electrolytic cell, is the one toward which positively charged particles are attracted.

The cathode has a negative charge because it is connected to the negatively charged .

When an electrolyte is dissolved in water and an electric current is passed through it, the Cations move towards the cathode and Anions move towards anode .

Cu will be produced at the negative electrode for the following reaction:

2CuSO4 (a q) + 2H20 (1) -> 2Cu(s) + 2H2SO4(l) + O2(g) ,hence option (b) is correct.

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The  H2  product will be produced at the negative electrode for the following reaction 2CuSO₄ (aq) + 2H₂0 (1) -> 2Cu(s) + 2H₂SO₄(l) + O₂(g). option D is correct.

The electrode is an electrical conductor or source of electricity that carries electric current or circuit to the non-metallic circuit parts of a circuit, some examples are electrolyte and semiconductor.

The following reaction 2CuSO₄ (aq) + 2H₂0 (1) -> 2Cu(s) + 2H₂SO₄(l) + O2(g) is a redox reaction in which the negative end is producing the H2 gas and copper gets solidify  at the positive end.

Therefore, H₂  product will be produced at the negative electrode for the following reaction 2CuSO₄ (aq) + 2H₂0 (1) -> 2Cu(s) + 2H₂SO₄(l) + O₂(g). option D is correct.

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Sucrose; C12H22O11

C9H8O4; acetyl salicylic acid

H2O2; hydrogen peroxide,

NaOH; sodium hydroxideExplanation:

The energy (E) of a particle can be expressed in terms of the wave number (k) using the equation E = ħk²/2m, where ħ is the reduced Planck's constant and m is the mass of the particle.

In quantum mechanics, the energy of particles is expressed by their wave numbers. When a particle's momentum (p) is known, the wave number (k) of the particle may be calculated using the Planck constant (h). Relationship between relativistic energy and momentum:

\(E^2 = (pc)^2 + (mc^2)^2\), where c is the speed of light and m is the particle's mass\(. E^2 = (hc*k)^2 + (mc^2)^2\) when \(p = hk. E = sqrt((hc*k)^2 + (mc^2)^2).\)

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0.20 M NH₄, and 0.20 M HCI and  0.20 M NH₄, and 0.10 M HF are  combinations  that can be used to make a buffer. Thus option A and C are correct.

A buffer solution is an acid or a base aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa.Its pH changes very little when a small amount of strong acid or base is added to it.

Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many living systems that use buffering for pH regulation. For example, the bicarbonate buffering system is used to regulate the pH of blood, and bicarbonate also acts as a buffer in the ocean.

As the combination of HCl and NH₄, and NH₄ and HF   are  combinations  that can be used to make a buffer. Thus option A and C are correct.

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The statement, "the crater is the bowl-shaped area around a volcano’s central vent," is true. A volcano's central vent is the opening in the Earth's surface through which lava, ash, and gas escape during an eruption.

The crater is a depression, cavity, or hollow area surrounding the central vent. The crater is bowl-shaped due to the eruption of magma, which produces a bowl-shaped opening. The shape of the crater can differ based on the eruption. For example, a small eruption may result in a smaller crater, while a massive eruption can cause a larger crater. The crater of a volcano can also contain a lake or a pool of lava. Some volcanoes also have more than one crater. These craters are formed due to different eruptions over the years. Craters can give geologists and scientists an insight into the eruption history of the volcano. They can study the layers of rock within the crater to learn more about the types of eruptions and how often they occurred.

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Answer:

Mass of arsenic chloride produced is 0.363 g

Explanation:

Given data:

Mass of arsenic chloride produced = ?

Mass of arsenic react = 0.150 g

Mass of chlorine = excess

Solution:

Chemical equation:

2As + 3Cl₂      →   2AsCl₃

First of all we will calculate the number of moles of arsenic.

Number of moles = mass/ molar mass

Number of moles =  0.150 g/ 75 g/mol

Number of moles = 0.002 mol

Now we will compare the moles of arsenic with arsenic chloride.

                          As             :             AsCl₃

                           2              :                2

                         0.002        :              0.002

Mass of arsenic chloride produced:

Mass = number of  moles × molar mass

Mass = 0.002 × 181.28 g/mol

Mass = 0.363 g

510.17 centimetres cube is the volume of iron has a density of 7.86 gram per centimetres cube ( 1 centimetre cube = 1ml) and has a mass of 4.01 kg.

Density is the amount of mass of a substance present per volume of the cubic centimetre and it is the ratio of mass of a substance to the volume of the substance with a unit centimetre cube.

The iron has a density of 7.86 gram per centimetres cube and mass of 4.01 kg so,

mass in grams= \(\frac{4.01}{1000} = 0.0041g.\\Density= \frac{mass}{volume}\)

Substituting the values in the equation, we get:-

volume= \(\frac{0.0041}{7.86} = 510.17 cm^{3} .\)

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Mass of the solid conjugate base should the student weigh out to make the buffer solution is  0.083 g.

For a buffer, buffer capacity is the pH range = pKa  1

Here among the given acid list

pKa of phosphoric acid = - log (7.52 x 10-3) = 2.12

pKa of formic acid = - log (1.77 x 10-4) = 3.75

pKa of propionic acid = - log (1.34 x 10-5) = 4.87

pKa of acetic acid = - log (1.75 x 10-5) = 4.75

Now, buffer capacity is the pH range = pKa  1

Here, pH 3 is in the range of buffer capacity of HCOOH.

Therefore, here we can conclude that formic acid (HCOOH) with pKa = 3.75, is the most suitable acid for preparing a buffer of pH 3.

To prepare the buffer with formic acid, the conjugate base that has to be used is sodium formate (HCOONa).

Final volume of the buffer = 100 mL = 0.1 L

[weak acid] = [HCOOH] = 0.1 M

pKa of HCOOH = 3.75

As per the Henderson Hasselbalch equation, pH = pKa + log [salt] / [acid]

Therefore, 3 = 3.75 + log [salt] / 0.1

or, 0.75 = log 0.1 / [salt]

or, 0.1 / [salt] = 5.62

or, [salt] = 0.018 M

Therefore, [HCOONa] = [salt] = 0.018 M

Moles of HCOONa in the buffer solution = 0.018 x 0.1 = 0.0018 moles

Molar mass of formic acid = 46.03 g / mol

Therefore, the mass of sodium formate (HCOONa) that has to be dissolved in the solution to prepare the buffer = 0.0018 x 46.03 = 0.083 g HCOONa

Now initial [HCOOH] provided = 2 M

Moles of HCOOH present in 0.1 L buffer solution = 0.1 x 0.1 = 0.01 moles

Moles of HCOOH present in 0.1 L buffer solution = moles of HCOOH added = 0.01 moles

Therefore, the volume of the provided stock concentration of the solution that had to be added to prepare the buffer = 0.01 / 2 = 0.005 L.

In order to prepare the buffer of pH 3;

Mass of HCOONa to be added = 0.083 g

The volume of 2 M HCOOH to be added = 0.005 L

Formic acid with pKa = 3.75, is the most suitable acid for preparing a buffer of pH 3.

To prepare the buffer with formic acid, the conjugate base that has to be used is sodium formate (HCOONa).

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Answer:

Fossil fuels are formed when living organisms die, and are buried under a tick layer of earth materials over a long time, usually over million s of years. Fossil fuels are formed under intense heat and pressure on the dead organisms due to the earth layer that has accumulated on the organisms over the years. The type of fossil fuels formed in a particular region depends on the type of organism that has lived in that region over the years, and the climate of the region. Regions with lush, swamp forests with many trees have enough  organic material to make coal over the years. The United states however still depend on the importation of other fossil fuel that are in minimal quantity in the country. Most regions have coal, because they once had forests and animals on them but countries like the United States and some other countries have them in abundance, because these regions had a huge amount of lush, swamp forests with many trees. Japan lacks significant domestic reserves of fossil fuel, except coal, and must import substantial amounts of crude oil, natural gas, and other energy resources, because of its climate and the fact that it is an island nation.

Fossil fuels are distributed unevenly because their formation requires precise conditions that aren’t found everywhere. For fossil fuels to form, they need to be subjected to anoxic (lacking oxygen) conditions that allow for great pressure, such as those found beneath the ocean floor.nation:

Answer:

common sedimentary rocks include sandstone, limestone, and shale.

The number of moles of Benzyl alcohol is 0.115 moles.

Number of moles can be also told in terms of Avogadro's number with is 6.023 × \(10^{23}\). It can be calculated for atoms, molecules, ions or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance. The concept of the mole helps to put quantitative information about what happens in a chemical equation on a macroscopic level. So it is used widely.

Molecular mass is nothing but the sum of atomic mass of all the element present in the molecule. In the above given question we have to calculate the number of moles of the molecule by using the given weight. To do so we use the below formula;

Number of moles = given weight

                               Molecular mass

⇒ 12.50  = 0.115 moles

   108.14

Therefore the number of moles in 12.50 g of benzene C2H5OH is 0.115 moles

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Answer:

114

Explanation:

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If a metal alloy is made of 25% (by weight) gold, The percentage means out of every 100 grams of the alloy, 25 grams of gold are present. If we have to calculate the number of grams of gold present in 12 grams of the alloy, we have to use a simple calculation involving percentage and weight.

Let's understand this concept by taking an example. Suppose an alloy weighs 100 grams and contains 25 grams of gold. We know that gold constitutes 25% of the alloy weight. Let's calculate the percentage of gold present in 12 grams of the alloy. We will use the formula, Percentage = (part/whole) x 100 Using the formula, percentage of gold present in the alloy = (25/100) x 100 = 25%.

This means that out of every 100 grams of the alloy, 25 grams of gold are present. To calculate the grams of gold present in 12 grams of the alloy, we use the following formula: Grams of gold = Percentage of gold/100 x Weight of the alloy= 25/100 x 12= 3Therefore, the amount of gold present in 12 grams of the alloy is 3 grams.

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Answer:

false

Explanation:

False.

According to Rutherford's theory, an atom's nucleus is surrounded by electrons that are negatively charged. He also asserted that the electrons that surround the nucleus travel in a circular pattern at extremely high speeds. He gave these elliptical routes the name orbits.

Atomic Model by Dalton.

Atomic model by J.J. Thomson.

The atomic model of Rutherford.

Principle of Neil Bohr.

Various Atomic Models FAQs.

Examples of this group include the compound-nucleus model (qq. v.) and the liquid-drop model. Other nuclear models combine elements from the two groups, such as the collective model (q.v. ), which combines the liquid-drop mode and the shell model.

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Answer: Strong acid vs weak acid

Strong acids and strong bases refer to species that completely dissociate to form ions in solution.

Explanation: By contrast, weak acids and bases ionize only partially, and the ionization reaction is reversible. Thus, weak acid and base solutions contain multiple charged and uncharged species in dynamic equilibrium.

ANSWER

The number of moles of Pb(SO4)2 is 1.5 moles

EXPLANATION

Given that;

The mass of Li2SO4 is 330g

Follow the steps below to find the moles of Pb(SO4)2

Step 1; Write the balanced equation of the reaction

Step 2; Find the number of moles of Li2SO4 using the below formula

Recall, that the molar mass of Li2SO4 is 109.94 g/mol

The number of moles of Li2SO4 is 3.00 moles

Step 3; Find the number of moles of Pb(SO4)2 using a stoichiometry ratio

In the above equation of the reaction, 1 mole Pb(SO4)2 reacts to give 2 moles LiSO4

Let the number of moles of Pb(SO4) be x

Therefore, the number of moles of Pb(SO4)2 is 1.5 moles

The specific heat of the metal is 0.113 J/(g℃).

To solve this problem, use

Q = mcΔT

where Q is the heat transferred, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Let's first find the heat absorbed by the metal,

Q1 = mcΔT = 100.0 g x c x (25.7℃ - 100.0℃)

Since the metal was heated in boiling water until it reached 100.0℃, we can assume that its initial temperature was 100.0℃, so ΔT = 25.7℃ - 100.0℃ = -74.3℃.

The specific heat of the metal is not given, so we can't solve for Q1 at this point. However, we can use the fact that the heat absorbed by the metal is equal to the heat released by the metal when it is dropped into the water,

Q1 = Q2

where Q2 is the heat released by the metal when it is dropped into the water.

Using the same equation for Q2,

Q2 = mcΔT = (100.0 g + 125 g) x 4.184 J/(g℃) x (25.7℃ - 20.1℃)

where 4.184 J/(g℃) is the specific heat of water.

Simplifying and solving for Q1,

Q1 = Q2 = 8396.7 J

Now, we can use the equation for Q1 to solve for the specific heat of the metal,

Q1 = mcΔT

8396.7 J = 100.0 g x c x (-74.3℃)

Simplifying and solving for c,

c = 0.113 J/(g℃)

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Answer:

Explanation:

A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.

As an acid

Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O

As a base

3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O

NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water

The sodium-potassium pump system moves sodium and potassium ions against large concentration gradients.

The sodium-potassium pump (Na, K-ATPase) was located in 1957. It is important in shrinking the cardiac muscle, kidney function, and nerve signaling. It proceeds two potassium ions into the cell with high potassium levels and pumps three sodium ions out of the cell and into the extracellular fluid.

The procedure of moving sodium and potassium ions across the cell membrane is an agile transport process involving the hydrolysis of ATP to give the necessary energy.

So we can conclude that The sodium-potassium pump system moves sodium and potassium ions in case of large concentration gradients.

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Sodium potassium pump is referred to as an enzyme found in the membrane of all animal cells.

These are transmembrane proteins that actively move ions and/or solutes against a concentration or electrochemical gradient across biological membranes.

The Na⁺/K⁺-ATPase enzyme is active. For every ATP molecule that the pump uses, three sodium ions are exported and two potassium ions are imported and  plays an important role in contracting the cardiac muscle, kidney function, and nerve signaling.

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Answer:

Correct

Explanation:

According to the balanced chemical reaction, 2 mol FeBr3 are consumed for every 3 mol Na2S consumed.

A balanced equation obey the law of conservation of mass. The coefficients are the numbers which are added to balance the chemical equation. Here the given mole ratio is correct.

An equation in which the number of atoms of reactants and products on both sides of the equation are balanced is defined as the balanced chemical equation. The coefficients which are added in front of the formula of each component represents the number of the species.

A molar ratio denotes the ratio between the amounts in moles of any two compounds involved in a balanced chemical reaction. By comparing the coefficient of each component, the mole ratio can be determined.

Here for the given reaction, for every 3 moles of Na₂S consumption 2 moles of FeBr₃ is also consumed. So the molar ratio of Na₂S to FeBr₃ is 2/3. Molar ratios are used as the conversion factors between products and reactants in many chemistry problems.

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Answer:

Hey there!

Density=Mass/Volume

Density=1.2/4555

Density=2.63e-4g/cm^3

Let me know if this helps :)

Answer:

\(\large \boxed{\text{0.88 L}}\)

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

\(p_{1}V_{1} = p_{2}V_{2}\)

Data:

\(\begin{array}{rcrrcl}p_{1}& =& \text{1.34 atm}\qquad & V_{1} &= & \text{ 0.56 L} \\p_{2}& =& \text{0.85 atm}\qquad & V_{2} &= & ?\\\end{array}\)

Calculations:  

\(\begin{array}{rcl}\text{1.34 atm} \times \text{0.56 L} & =& \text{0.85 atm} \times V_{2}\\\text{0.750 L} & = & 0.85V_{2}\\V_{2} & = &\dfrac{0.750}{0.85}\\\\& = &\textbf{0.88 L}\\\end{array}\\\text{The balloon's new volume is $ \large \boxed{\textbf{0.88 L}}$}\)

The reaction between 2-bromo-2-methylpropane (commonly known as tert-butyl bromide) and CH3-CH2-OH (ethanol) results in the formation of two products: tert-butyl ethyl ether and hydrogen bromide. The reaction mechanism involved is nucleophilic substitution.

1. Nucleophilic Substitution: Ethanol (CH3-CH2-OH) acts as a nucleophile and replaces the bromine atom in tert-butyl bromide (2-bromo-2-methylpropane) through a nucleophilic substitution reaction.

2. Product 1: The condensed structural formula for tert-butyl ethyl ether (also known as ethoxy-tert-butane) is (CH3)3COCH2CH3. This compound is formed when the ethoxy group (CH3-CH2-O-) of ethanol replaces the bromine atom in tert-butyl bromide.

3. Product 2: Hydrogen bromide (HBr) is formed as a byproduct of the reaction. Its condensed structural formula is HBr.

Therefore, the products of the reaction between 2-bromo-2-methylpropane and CH3-CH2-OH are tert-butyl ethyl ether [(CH3)3COCH2CH3] and hydrogen bromide (HBr). The reaction mechanism involved is nucleophilic substitution.

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The value of the quantum number n for the excited state is 3. In physics, wavelength is an important parameter of many types of waves, including electromagnetic waves such as light and radio waves, as well as sound waves and water waves.

What is Wavelength?

Wavelength is the distance between successive peaks or troughs of a wave. It is usually denoted by the Greek letter lambda (λ) and is commonly measured in meters (m) or nanometers (nm).

We can then use the equation ΔE = hf to find the energy released by the electron as it drops from the excited state to the ground state. The energy difference between the excited state and the ground state can be expressed as ΔE = -13.6 eV (1/\(nf^{2}\) - 1/\(ni^{2}\)), where nf is the quantum number of the final state (which is 1 for the ground state) and ni is the quantum number of the initial state (which is what we are trying to find).

We know that the energy released by the electron is equal to the energy difference between the excited state and the ground state, so we can set ΔE = hf and solve for ni:

ΔE = hf = -13.6 eV (1/\(1^{2}\) - 1/\(ni^{2}\))

ni = sqrt(1/(-13.6 eV/ hf + 1))

Plugging in the values we have calculated, we get:

ni = sqrt(1/(-13.6 eV/ (6.63 × \(10^{-34}\) J·s × 3.09 × \(10^{15}\)Hz) + 1)) = 3

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Answer:

When the moon moves between the sun for solar eclipse

When the earth moves between the sun and moon

(Extremely sorry if im wrong)

Explanation:

Answer:

social studies

Explanation:

Answer:

fe is not balanced

there is two on the reactant and one on the product

According to the concept of solubility, the pH of saturated solution of calcium hydroxide is 9.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Answer:

3.06 atm

Explanation:

Using general gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (litres)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK

T = temperature (K)

According to the information provided in this question, V = 4L, T = 25°C = 25 + 273 = 298K, n = ?

Mass of He gas = 2.0g

Using mole = mass ÷ molar mass

Molar Mass of He = 4g/mol

mole = 2/4

mole = 0.5mol

Using PV = nRT

P = nRT/V

P = 0.5 × 0.0821 × 298 ÷ 4

P = 12.233 ÷ 4

P = 3.06 atm

Hence, the pressure inside the container is 3.06atm.

Answer:

Explanation:

An acidic solution has a high concentration of hydrogen ions (H +start superscript, plus, end superscript), greater than that of pure wate