a copper ore consisting of 12.5% copper(ii) sulfide (95.61 g/mol), when heated and reacted with oxygen gas (32.00 g/mol), produces copper(ii) oxide (79.55 g/mol) and sulfur dioxide (64.06 g/mol). if the reaction has a 90.0% yield, how many grams of copper(ii) oxide are produced when 1.00 kg of the copper ore is processed?

The mass of H₂SO₄ that must dissolved in 1.08 liters of solution to make 2.69M solution is 271.52 grams.

The molarity of the substance is defined as the number of moles of solute per unit volume of solution in liters.

In this case,

The volume of the solution is 1.08 L.

The required molarity of the substance is 2.69M.

So,

we can write,

Molarity = Moles/Volume

Moles = Molariyt x volume

Moles =2.69 x 1.03

Moles = 2.77

Moles = Mass required/molar mass.

Molar mass of H₂SO₄ is 98 g/mol.

Putting values,

2.77=Mass required/98

Mass required = 271.52 grams.

So, 271.52 grams of H₂SO₄ is required to make 2.69M solution.

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For the recrystallisation step, we need 71.4ml of ethanol for the solubility of aspirin which has 100% yield.

What is solubility?

Solubility is the ability of a solute to dissolve in solvent to make a solution at a given temperature. This is because of the intermolecular forces balance between solute and solvent and change in entropy.

In 100 ml of the solution, the solubility of aspirin is 40 g. The mass of aspirin is not indicated in the problem, so it can be assumed that the mass of aspirin needed is 40 g. With this, the volume of the solution can be calculated.

Volume of the solution = 40g x 100ml/40g = 100ml

Density of aspirin = 1.4g/ml

Volume of aspirin = 40g x 1ml/1.4g = 28.57ml

Volume of ethanol = 100ml - 28.57ml = 71.4 ml

Therefore, the solubility of 40g of aspirin when yield is 100% requires 71.4ml of ethanol.

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The must be true of the two elements is All of the above.

An element is a substance composed of only one type of atom that cannot be broken down into simpler substances by either physical or chemical processes. They are divided into metals, non-metals, and semi-metals. Helium is the element with atomic number 2 in the periodic table. Each helium atom has two protons in its nucleus.

The atomic weight of the element is 4.0026. Helium is known as a gas in its pure form because it does not combine easily. A compound is a unique substance formed by the chemical combination of two or more elements. Compounds are formed through chemical reactions. Elements of a compound are held together by chemical bonds.

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The homozygous dominant genotype is 0%, the heterozygous genotype is 50%, and the homozygous recessive genotype is 50%.

This problem does not display the Punnett box. If the genotype of the heterozygous parent has spots (Ff) and the other parent is homozygous without spots, the cross between the two parents is:

Parental: Ff >< ff

Gametes: F . f >< f

Filial: Ff (heterozygous having freckles) and ff (recessive homozygous over not having freckles)

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Answer: 0%, 50%, 50%

Explanation:

Copper(II) sulfate is pale blue (cyan) because it absorbs light in the red region of the spectrum.

Spectrophotometry is the branch of electromagnetic spectroscopy that deals with the quantitative measurement of reflectance or transmission properties of materials as a function of wavelength.

A method of measuring how much light a chemical absorbs by measuring the intensity of light as it passes through a sample solution. The basic principle behind spectrophotometry is that each compound absorbs or transmits light in a specific wavelength range.

Copper(II) sulfate solution appears blue because it actually absorbs red region of spectrum which is a complementary color of blue.

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In block caving mining, the desired material is located underground, dissolved into a liquid, and then extracted. This is one method of mining sodium chloride, or salt.

Drilling holes beneath the ore body and utilizing designed blasts to disintegrate the ore and rocks are all part of block caving mining. Then, with the aid of gravity, the mixture of rocks and ore is carried for processing. Once the production from open-pit mining becomes unprofitable, block caving mining frequently occurs. Is called block caving mining

Salt Chloride (sodium chloride),  The ratio of the sodium and chloride ions in sodium chloride is exactly one to one. It is frequently referred to as table salt, common salt, or halite (the mineral form of common salt).

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162 grams of water have the same no. of oxygen atoms as 9.0 mol of oxygen gas.

1 mol of oxygen contains 6.023 * 10 [23] oxygen atoms.

That means 9.0 mol of oxygen gas is equals to 9*6.023*10[23] oxygen atoms .

To calculate the grams of water which will have 9*6.023*10[23] atoms of oxygen.

We have to know that in 18gms of water 1 oxygen atom is present.

So, for 9 oxygen atoms we will multiply with 18 that is 162 gms.

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Answer:

Water and CO2

Explanation:

These are both materials that are used in the process of photosynthesis that can be acquired from the around the plant, and the rain, which are natural raw materials that can be found anywhere in nature.

-Hope this helped

The sum of the coefficients involved in the equilibrium reaction equation is 5.

the equilibrium reaction equation is A chemical reaction is said to be balanced when the number of atoms of an element on the reactant side is equal to the number of atoms on the product side. You can check this by doing an atomic count.

When trying to solve this problem, the first step that must be taken is to obtain a balanced reaction equation. Because that's the key to what we're trying to get here. Now you can see the balanced reaction equation for the reaction and then get the total.

[tex]Pb(NO3)_2 + H_2S = > 2 HNO_3 + PbS[/tex]

The sum of the coefficients of the equilibrium reaction equation is 1+1+2+1=5.

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The minimum amount of oxygen required, in g, for complete combustion of C₅₇H₁₁₀O₆ will be 1304 g

Molecular formula = C₅₇H₁₁₀O₆

The amount is not given so we take it as 1 mol

The minimum amount of oxygen required for combustion = ?

First, we will write the chemical equation

    C₅₇H₁₁₀O₆ + O₂ = CO₂ + H₂O

Balance the chemical equation

    2C₅₇H₁₁₀O₆ + 163O₂ = 114CO₂ + 110H₂O

The molar ratio of C₅₇H₁₁₀O₆ to oxygen is 2 : 163

As we have 1 mol C₅₇H₁₁₀O₆; 163 / 2 = 81.5 mol

     number of moles of O₂ required = 81.5 mol

Covert the number of moles to grams

    grams = number of moles × molar mass

    grams of O₂ required = 81.5 mol × 16 g/mol

    grams of O₂ required = 1304 g

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The percent change in volume is 21 %.

given that :

temperature , T1 = 273 -28 = 245 K

temperature , T2 = 273 + 9 = 282 K

pressure P1 = P

pressure P2 = P - O.O5 P = 0.95 P

Volume V1 = V

volume V2 = ?

using ideal gas equation , we get :

P1 V1 / T1 = P2 V2 / T2

V2 = (P1 V1 T2 ) / P2 T1

V2 = ( P × V × 282 ) / ( 0.95 P × 245 P )

V2 = 1.211 V

change in volume is given as = V2 - V1

                                                 =  1.211 V - V

                                                 = 0.211 V

Percent change in volume is = (0.21 V)) / V ) × 100 %

                                                 = 21 %

Thus, For many purposes we can treat propane C3H8 as an ideal gas at temperatures above its boiling point of −42.°C Suppose the temperature of a sample of propane gas is raised from -28.0°C to 9.0°C, and at the same time the pressure is increased by 5.0% . the percent change in volume in 21 %.

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Answer:

D

Explanation:

Two characteristics of liquid oxygen contradict predictions from the valence bond theory that are explained by the molecular orbital theory are:

1) Pale blue color

2) Para-magnetism

The valence bond theory is not able to explain the para magnetic behavior of the oxygen that give pale blue color. This is explained by molecular orbital theory.

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The number of moles of aluminum that neutralizes the antacid is 7.95 moles.

An antacid is a substance that neutralizes the acidity in our stomach. Antacid contains substances like aluminum, magnesium and etc. It makes the pH alkaline when the pH drops below the required amount.

    According to the given condition, aluminum hydroxide reacts with hydrochloric acid.

Al(OH)3 + 3Hcl - Alcl3 + 3 H2O.

      Here, 1 mole of aluminum hydroxide reacts with 3 moles of hydrochloric acid.

Therefore, 2.65g will react with 3/1 moles.

Therefore, 3/1 x 2.65 = 7.95 moles.

Complete question: -

Some antacid tablets contain aluminum hydroxide. The aluminum hydroxide reacts with stomach acid according to the equation: AI(OH)3 +3HCIAICI, +3H2O. Determine the moles of acid neutralized if a tablet contains 0.200 mol of Al(OH)3

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Bones are classified into Five according to shape namely: Long bones, short bones, flat bones, iregular bones, sesamoid bones.

These are living tissues that contain their own blood vessels and are comprised of different cells, proteins, minerals, and vitamins. They make up the body's skeleton.

Bone classification according to shape:

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The alcohol concentration in parts per billion, ppb given that the alcohol limit is 250 of alcohol per 1 L of breath is 25×10¹⁰ ppb

The concentration of substance in parts per million, ppb can be obtained by using the filling formula:

Concentration (in ppb) = (amount of solute / volume) × 10⁹

With the above formula, we can obtain the alcohol concentration in parts per billion, ppb as shown below:

The concentration of the vitamin C in ppb can be obtained as follow:

Concentration (in ppb) = (amount of solute / volume) × 10⁹

Concentration (in ppb) = (250 / 1) × 10⁹

Concentration (in ppb) = 25×10¹⁰ ppb

Thus, the concentration in ppm is 25×10¹⁰ ppb

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2 liters of chlorine gas react to produce 2 l of hydrogen chloride gas

We may think about STP.

Gaseous hydrogen chloride in 2 L

PV = nRT

P = 1 atm

V = 2L

n = ?

R = Gas Constant, or 0.0821 L atm K-1 Mol-1.

T = 273

enter and find n in the equation

1 x 2 = n x 0.0821 x 273

n = 08923 mole

An comparable amount of Cl2 gas is required for every 0.08923 mole of hydrogen chloride gas (0.08923 = 0.044615 mole).

as a result, volume of 0.044615 mole of Cl2

P = 1 atm V =?n = 0.044615" T = 273

1 x V = 0.044615 x 0.0821 x 273

V = 1 Lit

Hence Chlorine gas must react to create hydrogen chloride gas, which requires a reaction volume of 2 L.

provide the same amount of 2 Liter

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0.79 gram is the mass of methane that will occupy the same volume as 0.0325 mol of propane at 1.00 atm 1.00 atm and 298 k.

The atmosphere contains small amounts of the gas known as methane. The simplest hydrocarbon is methane, which only has one carbon atom and four hydrogen atoms. Strong greenhouse gas methane is. Numerous anthropogenic (influenced by humans) and natural sources release methane into the atmosphere. Landfills, natural gas and oil pipelines, industrial processes, mining for coal, stationary and mobile combustion, wastewater treatment, and certain agricultural practises are examples of anthropogenic emission sources. propane primary applications include heating homes and water, preparing and storing food, driers for clothing, and industrial and farm machinery. Propane is also used as a raw material in the chemical industry to create plastics and other compounds.

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1) The species oxidized shows a(n) = increase in oxidation number.

2) The species reduced shows a(n) = decrease in oxidation number.

3) The species that shows a decrease in oxidation number is the = oxidizing agent.

4) The species that shows an increase in oxidation number is the = reducing agent.

The degree of biological activity controls both the formation of zones where specific redox processes predominate and the progression of environmental redox reactions. Anoxia, which are situations when the concentration of dissolved molecular oxygen is extremely low, is a requirement but not a sufficient condition for lowering conditions. The active microbial population shifts from communities that depend on aerobic respiration, in which molecular oxygen serves as the terminal electron acceptor, to anaerobic respiration, in which other chemical substances take the place of molecular oxygen as the terminal electron acceptor supporting respiration, as a result of the development of anoxia.

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1. Marie could test if the beads she collected were metals by seeing if they conducted electricity or by adding it to a dilute acid to see if hydrogen gas is evolved.

2. Since the reaction involved a metallic oxide, lead oxide, the metal would most probably be Lead.

3. The element that is combined with carbon in carbon dioxide is oxygen.

4. The element oxygen in this experiment comes from lead oxide.

5. Marie should wear goggles as a piece of safety equipment in this experiment.

Metals are shiny hard substances that form positive ions by the loss o electrons.

Some properties of metals include;

Lead is an example of metal whereas lead oxide is a compound of lead and oxygen.

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189.8 mol of O₂ are required to react completely with 10.6 moles of butane.

An accident occurred when the Hindenburg, an airship filled with hydrogen, tried to land in New Jersey in 1937. 36 persons were killed when the airship was destroyed and the hydrogen instantly exploded in a massive explosion. The chemical process was straightforward: water was created when hydrogen and oxygen combined.

A hydrocarbon, a substance comprised only of carbon and hydrogen, is involved in numerous combustion reactions. Carbon dioxide and water are the byproducts of the burning of hydrocarbons. Since their combustion produces more amounts of heat energy, many hydrocarbons are use fuel. Gas grills frequently use propane (C3H8) as their fuel source. Propane is a gaseous hydrocarbon.

Reaction is:

C₄H₁₀ + [tex]\frac{13O_{2} }{2}[/tex] → 4CO₂ + 5H₂O

Given,

no. moles of butane = 29.2 mol

from the balanced chemical equation,

we can say that:

1 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] moles of O₂

29.2 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] × 29.2

⇒189.8 mol of O₂

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By finding the serial fraction, we arrive to the aforementioned Karp-Flatt metric.

A measure of code parallelization in systems with parallel processors is the Karp-Flatt metric. This metric exists in addition to Amdahl's law and Gustafson's law as a measure of the level of parallelization of a specific computer code. In 1990, Horace P. Flatt and Alan H. Karp made the suggestion.

The effectiveness of a parallel algorithm operating on a parallel processor can be evaluated in a variety of ways. The Karp-Flatt metric identifies a statistic that highlights performance characteristics that are difficult to identify from other metrics. Amdahl's Law has the following pseudo-"derivation," .

Note that the left hand side reflects a metric quantity rather than a quantity that was derived mathematically, indicating that this is not a "derivation" from Amdahl's law. The analysis above only demonstrates that the Karp-Flatt measure and Amdahl's Law are compatible.

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Since the start of the industrial revolution more than 200 years ago, human activity has led to an increase in the atmospheric concentration of carbon dioxide (CO2). The pH of the ocean's surface waters has decreased by 0.1 pH units throughout this time.

A significant and swift transition in an economy (as in late-18th-century England) signaled by the widespread adoption of power-driven machinery or by a significant shift in the prevalent forms and applications of such machinery.

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The normal, low-level measurement on the detector when dealing with a Geiger-Mueller tube to detect nuclear radiation is known as background radiation.

This is referred to as the emission or transmission of energy through space or a material medium. This is usually in the form of waves or particles and it is used for various purposes such as in treatment of diseases.

Radiation can also cause a change in DNA thereby resulting in mutation when exposed to large amounts. Geiger-Mueller tube is used to detect nuclear radiation by scientists for various operations.

In a scenario where there is a low count rate on the detector, it means small amounts were released which is known as the background radiation and it is responsible for the normal, low-level measurement.

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the energy emitted by photon was 0.300564×10-18 J

what is photon?

The term photon, which means "light" in Ancient Greek, refers to a basic particle that is a quantum of the electromagnetic field, which includes electromagnetic radiation like light and radio waves. It also serves as the force carrier for the electromagnetic force. Considering that photons have no mass, they always travel at the speed of light in a vacuum, which is 299792458 m/s (or 186,282 mi/s).

formula was

ΔE=R(1n2f−1n2i)

R=the Rydberg constant, 2.178×10-18 J

For a transition from n=3 to n=2, we get

ΔE=2.178×10-18 J(1/22−1/32)

=2.178×10-18 J(1/4−1/9)

=2.178×10-18 J× 9 – 4/9×4

=2.178×10-18 J× 5/36

=0.300564×10-18 J

hence the energy emitted by the photon was 0.00564x10-18J

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The unstable species is called as transition state.

Transition state in a chemical reaction is a point in the chemical reaction with highest potential or highest energy. This state is said to be the most unstable stage of any chemical reaction and this unstable stage exists between the substrate and the products.

When any chemical reaction takes place the energy of the reaction or the potential of the reaction gradually starts increasing as new bonds are about to form and the old bonds are ready to break. Once the reaction reaches a highest potential point we can see that at this point partial bond braking and partial bond is happening, this is called as the transition state.

As this is the unstable  state the reaction starts to loose energy as the product is formed.

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The minimal concentration of chloride ion is 1.67 × 10 ⁻³ M

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

calculation:-

2NaCl + Pb ⁺² ------------>  PbCl₂

  Ksp = [Pb⁺][Cl⁻]²

   [Cl⁻]       =  [tex]\sqrt{ \frac{Ksp}{[Pb+]}[/tex]

                 = [tex]\sqrt{ \frac{1.4×10^{-8} }{0.0049}[/tex]

                 = 1.67 × 10 ⁻³ M

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