what happens during rusting
A. iron oxide decomposes to iron releasing oxygen
B. iron and oxygen react to form iron oxide
C. iron combusts in oxygen
D. water reacts with iron releasing oxygen

0.753 M MgCl2 is the molarity of a solution prepared from 19.7 grams of mgcl2 in 275 milliliters of solutions

Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.

One mol/L of a solution's concentration is referred to as one molar, or 1 M. Because the volume of most solutions very minimally changes with temperature owing to thermal expansion, using molar concentration in thermodynamics is frequently not practical. Usually, incorporating temperature adjustment factors or utilizing a temperature-independent metric will fix this issue.

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The following statements are true about organic compounds versus inorganic compounds:

Thus, the correct options are option A and B.

Organic compounds typically have lower melting and boiling points compared to inorganic compounds due to the presence of weaker intermolecular forces, such as van der Waals forces, in organic molecules. The flammability of organic compounds can vary greatly and is not universally lower than inorganic compounds.

Additionally, organic compounds are more likely to have covalent bonds rather than ionic bonds, which are more common in inorganic compounds.

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Answer:

Magnetism

Explanation:

The iron fillings would be magnetic therefore using a magnet would be the simplest way to separate the two.

Answer:

Explanation:

A. molecules of CaCO3 = number of moles x avogadros number

=  2.5 x 6.022 x 10^-23 =  1.5055 x 10^-22

B. the mass of 2 moles of Al2O3 is = molar mass of Al2O3 x number of moles

the molar mass of Al2O3 = 2 x molar mass of Al + 3 x molar mass of O

= 2 x 27 + 3 x 16 = 102 g/mol

the mass of Al2O3 = 102 x 2 = 204 g

C. 1 mol of Be3N2 = number of moles x molar mass of Be3N2

molar mass of Be3N2 = 3 x molar mass of Be + 2 x molar mass of N

= 3 x 9 + 2 x 14 = 55g/ mol

so the mass of 1 mol of Be3N2 is 55 g

Answer:

D. The catalyst could absorb one of the particles, making a successful (reaction-producing) collision with the other particles more likely.

Explanation:

The way that a solid (heterogenous) catalysts functions is by the reactant getting adsorbed to the surface of the catalyst at active sites. An interaction between the surface of the catalyst and the reactant makes the reactants more reactive, causing the reaction to happen.

Catalyst can absorb one particle and makes successful collisions with other particles. Therefore, option (D) is correct.

Catalysis can be described as the process of increasing the rate of a reaction by adding a substance called a catalyst. Catalysts are generally not consumed in the chemical reaction and remain unchanged after it.

The catalyst recycles quickly, and very small amounts of catalysts are sufficient, mixing, surface area, and temperature are factors in the reaction rate. Catalysts react with one or more reactants to create intermediates that give the final reaction product.

Catalysis is homogeneous, whose components are dispersed in the same phase as the reactant, or heterogeneous Catalysis, whose components are not in the same phase.

The addition of a solid catalyst could increase the rate of the reaction because catalysts increase the frequency of the successful collision as more molecules have activation energy.

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In order to assess the spontaneity of a chemical reaction or physical process, both the change in enthalpy (ΔH) and entropy (ΔS) associated with the reaction or process must be known.

The summary of the answer is that to determine if a chemical reaction or physical process is spontaneous, we need to consider the changes in both enthalpy and entropy. Enthalpy (ΔH) refers to the heat energy exchanged during a reaction or process. It represents the difference between the energy of the products and the energy of the reactants. A negative ΔH indicates an exothermic reaction or process, where heat is released, while a positive ΔH indicates an endothermic reaction or process, where heat is absorbed. Entropy (ΔS) is a measure of the disorder or randomness in a system. It represents the change in the number of energetically equivalent microstates available to the system. An increase in entropy (positive ΔS) means an increase in disorder, while a decrease in entropy (negative ΔS) means a decrease in disorder. For a reaction or process to be spontaneous, it generally requires a decrease in enthalpy (ΔH < 0) and/or an increase in entropy (ΔS > 0). This can be determined by evaluating the Gibbs free energy change (ΔG), which combines the effects of enthalpy and entropy (ΔG = ΔH - TΔS, where T is the temperature in Kelvin). If ΔG is negative, the reaction or process is spontaneous. If ΔG is positive, the reaction or process is non-spontaneous.

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Answer:

Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water.

Answer:

answer-COMPOUND COPPER OXIDE

Answer:

it's balanced form is ZnS+Ca(NO3)2

Explanation:

The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

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Solids exhibit the strongest intermolecular force of attraction.

Particles in a petrol have relatively little attraction to one another. In comparison to the particles in a solid or liquid, they are constantly moving and quite far apart. As the particles collide, they just hit one other and bounce off of one another without engaging in any interaction.

Compared to liquids and gases, solids usually exhibit the highest intermolecular forces. Because the particles in solids are tightly packed, they are incompressible and have a high density.

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When hydrogen chloride gas is added to water, the products are hydronium ions and chloride ions and as the hydrogen ion is an acceptor, water is described as a Bronsted-Lowry base.

Generally according to concept of Bronsted-Lowry theory," acid is defined as a substance which donates an H⁺ ion or a proton and forms its conjugate base and the base is defined as a substance which accepts an H⁺ ion or a proton and forms its conjugate acid".

And now we can see that a hydrogen ion usually gets transferred from the HCl molecule to the H₂O molecule to give chloride ions and hydronium ions. And it is also clear that the hydrogen ion donor, HCl acts as a Bronsted-Lowry acid and also as a hydrogen ion acceptor, H₂O is a Bronsted-Lowry base.

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Answer:

#1 is c  #2 is d and #3 isd

Explanation:

Answer:

Explanation:

Carbon C

Water molecules are attracted to the molecules in the wall of the glass beaker. And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus.

Every molecule has a shape. Some are shaped like the letter V, and some are trigonal. The shape of a molecule can be determined by the Valance Shell Electron Pair Repulsion Theory (VSEPR).

VSEPR theory is a theory that can describe the shape of electrons in three dimensions according to the repulsion of pairs of valence electrons and also free electrons.

This repulsion produces angles between the electrons that make up the molecule. VSEPR theory relies on the Lewis structure as the basis for determining lone and bond pairs. The repulsion of free electrons is greater than the repulsion between free electrons and bound electrons.

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Answer:

5.70×10^-11 m

Explanation:

The idea of the atomic nature of matter was first developed by John Dalton.

He introduced the atomic theory, which proposed that matter was made up of tiny, indivisible particles called atoms. This theory was based on his observations and experiments on the behavior of gases

.Dalton's atomic theory had several postulates that helped explain the properties of matter. These postulates were:

All matter is made up of atoms, which are tiny, indivisible particles

.Each element is composed of atoms that are identical in size, shape, and chemical properties.

Atoms of different elements have different sizes, shapes, and chemical properties.

Atoms combine in fixed ratios to form compounds, and the ratios of their masses are related by whole numbers.

Atoms are indestructible and cannot be created or destroyed in chemical reactions

.However, Dalton's atomic theory was later modified and expanded upon by other scientists, including J.J. Thomson, Ernest Rutherford, and Niels Bohr, as new discoveries about the structure and behavior of atoms were made.

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Yes, \(Br^{-}\) and \(Cl^{-}\) ions both can be positively identified through  precipitation reaction or precipitimetry.

Through titration employing precipitation reaction or precipitimetry, these two ions can both be positively identified. When exposed to Cl- and Br- ions, AgNO3 transforms into silver halides. AgNO3 with Cl- ions precipitates white because AgCl is not particularly soluble in water, whereas AgNO3 with Br- ions precipitates cream.

A very light cream precipitate results from mixing cream and white ppt.

Both halides react as described below:

\(AgNO_{3}+ XCl\)\(= AgCl_{whiteppt.}\)

\(AgNO_{3}+ XBr\) \(= AgBr_{creamppt.}\)

Now, While AgBr does not dissolve in diluted ammonia, this AgCl precipitate does to create an Ag-diammonium ion combination. Two facts, including the fact that the ppt shade is now darker than the prior pale cream, demonstrate this. As a result of the addition of an ammonia solution, it becomes less concentrated, although some cream precipitates persist.

Second, concentrated ammonia dissolves the AgBr precipitate. AgBr precipitates dissolve when cream precipitate is filtered and concentrated ammonia is added. In solution Br- ions are confirmed by this.

\(Ag^{+}+NH_{3}\) ⇄ \((AgNH_{3} )_{2} ^{+}\)

The foregoing reaction switches in the right direction after the addition of diluted ammonia solution, and more and more Ag+ ions are complexed, producing the soluble form of Ag-diammonium complex.

Brown globules are produced when CHCl3 is added to the mixture and agitated.

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Answer:

atomic mass=Protons+Neutrons=29+35=64

Explanation:

please complete question.

The emission of a photon with the largest energy can be identified using the energy formula for an electron's transition between different energy levels in an atom.

The larger the energy difference between the initial and final energy levels, the larger the energy of the emitted photon. The energy difference between the initial and final energy levels is directly proportional to the frequency and inversely proportional to the wavelength of the emitted photon. Therefore, the larger the frequency or the smaller the wavelength, the larger the energy of the emitted photon.(a) n = 2 to n = 1: ΔE = 2.18 x 10^-18 J - 5.45 x 10^-19 J = 1.64 x 10^-18 J. The frequency of the emitted photon is given by:f = ΔE/h = (1.64 x 10^-18 J)/(6.626 x 10^-34 J s) = 2.47 x 10^15 Hz. The wavelength of the emitted photon is given by:λ = c/f = (2.998 x 10^8 m/s)/(2.47 x 10^15 Hz) = 1.21 x 10^-7 m.(b) n = 3 to n = 1: ΔE = 2.18 x 10^-18 J - 1.36 x 10^-18 J = 8.23 x 10^-19 J. The frequency of the emitted photon is given by:f = ΔE/h = (8.23 x 10^-19 J)/(6.626 x 10^-34 J s) = 1.24 x 10^15 Hz. The wavelength of the emitted photon is given by:λ = c/f = (2.998 x 10^8 m/s)/(1.24 x 10^15 Hz) = 2.42 x 10^-7 m.(c) n = 6 to n = 4: ΔE = 2.18 x 10^-18 J - 4.86 x 10^-19 J = 1.69 x 10^-18 J. The frequency of the emitted photon is given by:f = ΔE/h = (1.69 x 10^-18 J)/(6.626 x 10^-34 J s) = 2.55 x 10^15 Hz.

The wavelength of the emitted photon is given by:λ = c/f = (2.998 x 10^8 m/s)/(2.55 x 10^15 Hz) = 1.18 x 10^-7 m.(d) n = 1 to n = 4: ΔE = 4.36 x 10^-19 J - 2.18 x 10^-18 J = -1.74 x 10^-18 J. This is an absorption process, not emission.(e) n = 2 to n = 4: ΔE = 4.86 x 10^-19 J - 1.64 x 10^-18 J = -1.16 x 10^-18 J. This is an absorption process, not emission.Therefore, the correct answer is (b) n = 3 to n = 1 because it has the smallest wavelength and the highest frequency, and therefore, the largest energy of the emitted photon. The energy formula for this transition is ΔE = 8.23 x 10^-19 J, and the wavelength of the emitted photon is 2.42 x 10^-7 m.

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Coenzymes are organic compounds required by many enzymes for catalytic activity. They can be vitamins or their derivatives.

Acyl carrier is used for the process of converting heptane to 2- heptene.

A coenzyme exists described as an organic molecule that binds to the active areas of certain enzymes to help in the catalysis of a reaction. More specifically, coenzymes can function as medium carriers of electrons during these reactions or be transmitted between enzymes as functional groups.

Coenzymes are organic compounds required by many enzymes for catalytic activity. They can be vitamins or their derivatives. Sometimes they act as a catalyst in the absence of enzymes.

For example, Vitamin B and methionine.

Acyl Carrier protein plays an important role in transporting the fatty acid chain and is synthesized from one catalytic site of the fatty acid synthase complex to another.

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Answer:

eswl uses shock waves to break kidney stones into small pieces that can more easily travel through the urinary tract.

Explanation:

hope this helps

Answer:

Extractive metallurgy

Explanation:

Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted raw metals into a purer form.

Answer:

12.665 mols

Explanation:

You can just plug into the equation finding n, which is moles. The equation would be n = PV/RT. atm is 9.16, Volume is 42, 0.08206 or 0.0821 in this case is the constant, and T is the temperature which is 370 Kelvin.

The answer is already given which is in the carbon cycle methanotrophs consume methane that are produced by other species.

Prokaryotes known as methanotrophs use methane as a source of carbon and chemical energy. They can develop aerobically or anaerobically, are bacteria or archaea, and need single-carbon molecules to thrive.

Despite the fact that some methanotrophs can oxidize atmospheric methane, methanotrophs are most prevalent in or close to areas where methane is produced. Among their habitats are marshes, soils, and wetlands. Given their significant contribution to the global methane budget, they are of particular interest to scientists researching global warming.

The particular instance of methylotrophy known as methylnotrophy involves the use of single-carbon molecules that are more reduced than carbon dioxide. Methylocella silvestris and Methylocapsa aurea are the only facultative methanotrophs known to date.

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Answer:

A versatile Ideal Gas Laws calculator with which you can calculate the pressure, volume, quantity (moles) or temperature of an ideal gas, given the other three. Free online gas law calculator a.k.a. PV = nRT calculator which accepts different input metric units such as temperature in celsius, fahrenheit, kelvin; pressure in pascals, bars, atmospheres; volume in both metric and imperial units

Explanation:

The current of 0.25 A must pass through the sulfuric acid solution for approximately 13,748 seconds (or approximately 3.82 hours) to liberate 0.400 L of H₂ gas at STP.

To determine the number of faradays required to release 0.150 mol of Cl₂ gas at the anode during the electrolysis of an aqueous NaCl solution, we can use Faraday's law of electrolysis.

The balanced half-reaction at the anode during the electrolysis of an aqueous NaCl solution is:

2Cl⁻(aq) -> Cl₂(g) + 2e⁻

From the balanced equation, we can see that 2 moles of electrons are required to produce 1 mole of Cl₂ gas. Therefore, to produce 0.150 mol of Cl₂ gas, we would need to transfer 0.150 x 2 = 0.300 moles of electrons.

1 mole of electrons represents 1 faraday of charge (1 mole of electrons = 96,485 C or 1 F). Therefore, to release 0.300 moles of electrons, we would need 0.300 faradays of charge.

So, 0.300 faradays need to be transferred at the anode to release 0.150 mol of Cl₂ gas.

Regarding the second question, to calculate the time required for a current of 0.25 A to liberate 0.400 L of H₂ gas at STP (Standard Temperature and Pressure), we need to use the concept of Faraday's law and the molar volume of a gas at STP.

The balanced half-reaction for the liberation of H₂ gas during electrolysis is:

2H⁺ + 2e⁻ -> H₂

From the balanced equation, we can see that 2 moles of electrons are required to produce 1 mole of H₂ gas. Therefore, to produce 0.400 L of H₂  gas at STP (which is equivalent to 0.400/22.4 = 0.0179 moles), we would need to transfer 0.0179 x 2 = 0.0358 moles of electrons.

Using Faraday's law, 1 mole of electrons represents 1 faraday of charge (1 mole of electrons = 96,485 C or 1 F). Therefore, to transfer 0.0358 moles of electrons, we would need 0.0358 faradays of charge.

To calculate the time (t) required for this charge to pass through the solution, we can use the equation:

Q = I * t

Where Q is the charge (in coulombs), I is the current (in amperes), and t is the time (in seconds).

Converting the current to coulombs:

0.25 A * t = 0.0358 F * 96,485 C/F

Solving for t:

t = (0.0358 F * 96,485 C/F) / 0.25 A

t ≈ 13,748 seconds (or approximately 3.82 hours)

Therefore, a current of 0.25 A must pass through the sulfuric acid solution for approximately 13,748 seconds (or approximately 3.82 hours) to liberate 0.400 L of H₂ gas at STP.

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0.300 faradays need to be transferred at the anode to release 0.150 mol of Cl gas.

To determine the number of faradays needed to release 0.150 mol of Cl gas at the anode, we can use Faraday's laws of electrolysis.

First, we need to determine the number of moles of electrons required to release 0.150 mol of Cl gas. From the balanced equation:

2 Cl-(aq) → Cl2(g) + 2e-

We can see that 2 moles of electrons are required to release 1 mole of Cl2 gas. Therefore, the number of moles of electrons required to release 0.150 mol of Cl gas is:

0.150 mol Cl * (2 mol e-/1 mol Cl) = 0.300 mol e-

Next, we can use Faraday's first law to determine the number of faradays required. Faraday's first law states that the amount of substance produced or consumed is directly proportional to the quantity of electricity passed. One faraday is equal to the charge of one mole of electrons, which is approximately 96,485 coulombs.

Therefore, the number of faradays required is:

0.300 mol e- * (1 faraday/1 mol e-) = 0.300 faradays

So, 0.300 faradays need to be transferred at the anode to release 0.150 mol of Cl gas.

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