Hello there user can you explain and solution why is it correct ?​

1. The concentration of H2C6H6O6 is given as 0.0439 M. Assuming complete dissociation, the initial concentration of HC6H6O6- is also 0.0439 M. Therefore, [HC6H6O6-] = 0.0439 M.

2. The pH of the solution is 2.59.

C6H5COOH ⇌ H+ + C6H5COO-

Ka = [H+][C6H5COO-] / [C6H5COOH]

6.5 × \(10^{-5}\)= [H+]² / 0.478

[H+] = 0.00255 M

Using the pH formula, we can then calculate the pH of the solution:

pH = -log[H+]

pH = -log(0.00255)

pH = 2.59

3. HCN + H2O ⇌ H3O+ + CN-

Ka = [H+][CN-] / [HCN]

4.9 × \(10^{-10}\) = [H+]² / 0.563

[H+] = 1.57 × \(10^{-5}\)M

Kw = [H+][OH-]

1.0 × \(10^{-14}\) = (1.57 × \(10^{-5}\))[OH-]

[OH-] = 6.37 × \(10^{-10}\) M

Concentration refers to the amount of a substance that is present in a given volume or mass of another substance. It is a measure of the relative amount of solute present in a solution or mixture. The most common ways of expressing concentration in chemistry are molarity, molality, percent composition, and parts per million.

Molarity, denoted as M, is the number of moles of solute per liter of solution. Molality, denoted as m, is the number of moles of solute per kilogram of solvent. Percent composition is the mass of solute present in a solution expressed as a percentage of the total mass of the solution. Parts per million (ppm) is a measure of the concentration of a solute in a solution, expressed as the number of parts of the solute per million parts of the solution.

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Answer:

2,33 kg nitrogen

Explanation:

MOLAR MASS UREA = 12 + 16 + 2*14 + 4*1 = 28 + 28 + 4 = 60 g/mole

5kg = 5000g

1 mole - 60 g

x mole - 5000 g

x = 500/6 mole

-------------------------------------

1 mole urea - 28 g nitrogen

500/6 mole - y

y = 7000/3 g ≅ 2333,33 g ≅ 2,33 kg nitrogen

The given text appears to be a citation or reference for a scientific paper titled "The Development of Selected Reaction Monitoring" by Bereman, M. S., Maclean, B., Tomazela, D. M., Liebler, D. C., and MacCoss, M. J. published in 2012.

Selected Reaction Monitoring (SRM) is a targeted mass spectrometry technique used for quantitative analysis in proteomics research. It is commonly employed to measure specific peptides or proteins in a complex biological sample. SRM allows for the detection and quantification of molecules of interest with high sensitivity and specificity.

In SRM, a mass spectrometer is programmed to monitor specific precursor ions and their corresponding fragment ions. This is achieved by selecting a precursor ion based on its mass-to-charge ratio (m/z) and then monitoring the specific fragment ions produced from its fragmentation. By selecting specific precursor and fragment ions, SRM enables the detection and quantification of specific peptides or proteins within a complex sample.

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Answer:

The ice platfor is slowly decrecing from 3.5 km to 2.2km over the  span of 60 years.

Explanation:

Answer:

3.79 ×10²³ atoms

Explanation:

Given data:

Mass of Se = 49.6 g

Number of atoms = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of selenium is 78.96 g/mol.

by putting values,

Number of  moles = 49.6 g/ 78.96 g/mol.

Number of moles = 0.63 mol

Number of atoms:

Now we will apply Avogadro number.

1 mole contain 6.022×10²³ atoms

0.63 mol ×  6.022×10²³ atoms / 1 mol

3.79 ×10²³ atoms

Answer:=33.8 psi

Explanation:

Answer:

33.8007 (i think)

Explanation:

Answer:

the angle of reflected light distorts the image to appear larger or smaller

Answer: 1kg

Explanation:

The Ice cream hasn't lost any mass it has just turned into liquid form.

The 1 kg mass of frozen vanilla ice cream when completely melts into its liquid form, equal mass of liquid is formed there. Melting does not change the mass of the frozen ice cream.

Melting is the physical change by which a substance undergo the physical transition from solid to liquid. The temperature at which this phase change occurs for that substance is called its melting point.

The melting point of a substance depends on the bond type, pressure ,temperature and presence of impurities. Any physical transition doe not change the mass of the substance.

Therefore, the mass of a substance does not change during melting. Hence, when 1 kg of frozen ice cream is melted completely it forms 1 kg of water then.

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Answer: 1 - D

2 - B

Explanation:

When a reactant loses electrons during a reaction, it is called oxidation. When a reactant gains electrons during a reaction, it is called reduction. Since Bromine gained an electron it got reduced and since Iodine lost an electron, it got oxidized.

Br2 had 0 charges and in NaBr, it got a -1 charge, so it gained an electron and thus got reduced. Iodine had a -1 charge in NaI and in I₂ it got a 0 charge, so it lost an electron and thus got oxidized.

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Answer:

\({ \tt{c). \: replacement}}\)

C) replacement

Iron(III) oxide (Fe2O3) reacts with aluminium(Al) to form aluminium oxide(Al2O3) and molten iron(Fe). This is a replacement reaction

Answer: The water will cool down

Explanation:

Both the water and the metal block will reach Thermal equilibrium which is a state where neither of them will be transferring energy (heat) to the other because they are now of the same temperature.  

For instance, if you put a cold can in water to warm it up, the water will keep reducing in temperature while the cold can increases in temperature until both the can and the water have the same temperature.

The same logic applies here. The metal block is cooler than the water so the water will cool down and the metal block will get more heat until both of them achieve a temperature somewhere between the temperatures that both the water and the block started off with.

Answer:

1) Find the molar mass of all the elements in the compound in grams per mole.

2) Find the molecular mass of the entire compound.

3) Divide the component's molar mass by the entire molecular mass.

4) You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.

Explanation:

The mitochondrial inner membrane contains succinate dehydrogenase, a respiratory enzyme involved in the citric acid cycle and electron transport chain. Succinate dehydrogenase catalyzes the dehydration of succinate, converting it to fumarate in step 6 of the cycle. Two hydrogens are transferred to FADH2 to reduce FAD.

In the citric acid cycle, α-ketoglutarate is a molecule that is converted to succinate, fumarate, malate and oxaloacetate in the following processes.

Succinate binding of the succinate dehydrogenase reaction is competitively inhibited by malonic acid. Citric acid cycle intermediates such as succinate, succinyl-CoA and α-ketoglutarate accumulate in the presence of malonic acid.

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When two oxygen atoms bond together in O2, they form a non-polar covalent bond.

What are covalent bonds?

A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are mentioned as shared pairs or bonding pairs. once they share electrons, the stable balance of attractive and repulsive forces between atoms is known as a covalent bond When two oxygen atoms are bonded as O2, they form a non-polar covalent bond. When two non-metal atoms sharing of electrons, a covalent bond is created. The involved electrons are located in the atoms' outer shells. An atom's outer shell will be completed if it shares one or both of its electrons. Covalent bonds require a lot of energy to break because they are so strong.

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The coefficient of oxygen is five which is needed to balance the given chemical equation and equation is C₃H₈ +5 O₂\(\rightarrow\) 3 CO₂ +4   H₂O.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

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2.2 x 10^-2

0.055 / 250 = 0.00022 - This would be 2.2 x 10^-4, but the question is asking for percent, not proportion, so multiply by 100% to get the percentage.

0.00022 * 100% = 0.022% = 2.2 * 10^-2

Sorry this question is incomplete.

The net ionic equation for the given condition is: -

MnO4 (aq) + 5Fe2+ (aq) + 8H30+ (aq)— Mn2+ (aq) + 5Fe3+ (aq) + 12H2O(a)

A balanced chemical equation is the equation where all the number of reactant and products are equalized based on the number of moles and concentration.

        According to the given condition, we have 0.1569 Molar permanganate solution titrated.

    For 1L of solution we have 0.1569 molar permanganate,

Therefore,

1000ml = 0.1569m

19.53ml = 19.53 x 0.1569 / 1000

              = 0.00306 moles. = 3.06 x 10^-3 moles.

The ionic equation says that 1 mol of MnO4- reacts with 5 moles of Fe2+ so, 3.06 x 10^-3 reacts with 19.53 ml to give,

19.53ml = 3.06 x 10^-3

30.00 ml = 3.06 x 10^-3 x 30.00/ 19.53

               = 4.700 x 10^-3 moles.

This quantity of moles are in the solution required, in the volume i was given (30.00 ml). To get the concentration I have to calculate the moles in 1L.

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To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

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Answer:

1,2,3,4,8,9,10,12,14,15 and 16

Explanation:

Coz they have different kinds (colours) of atoms

The rest are pure substances,

I'm not so sure though, double check after this

Answer: Rift zones are common places for igneous rock to form because the pulling apart of rocks decreased the pressure on buried rocks.

Explanation: magma can then form and solidify.

Stoichiometric balance of a combustion reaction. A stoichiometric balance of a combustion reaction must demonstrate conservation of mass, but not conservation of moles because stoichiometry of a chemical reaction is based on the number of atoms and molecules, but not their masses or volumes.

Conservation of mass is a fundamental principle of physics and chemistry which says that in a closed system, mass cannot be created or destroyed, but only transformed from one form to another. In other words, the total mass of the reactants must be equal to the total mass of the products in a chemical reaction, regardless of the masses or volumes of the individual molecules involved.

On the other hand, conservation of moles refers to the fact that in a balanced chemical equation, the number of moles of each reactant and product is equal. However, since different molecules have different masses, conservation of moles does not necessarily imply conservation of mass.

For example, if one mole of oxygen reacts with one mole of hydrogen to form one mole of water, the number of moles of each substance is conserved, but the mass is not, since the mass of water is greater than the combined mass of oxygen and hydrogen.

The stoichiometric balance of a combustion reaction must demonstrate conservation of mass because the reactants and products involved in combustion reactions are typically gases or liquids that can be easily measured by volume or weight.

Since the number of atoms and molecules involved in the reaction is fixed by the stoichiometry of the equation, the conservation of mass principle ensures that the mass of the reactants is equal to the mass of the products, even if the masses or volumes of individual molecules differ.

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Answer:

It reduces the amount of thermal energy that is transferred from outside to inside the container.

Explanation:

Remember that thermal energy = heat. Also foam cannot remove thermal energy, it is an insulator meaning it prevents the transfer of thermal energy.

First choice: Foam cannot just remove thermal energy

Second: Again foam does not remove energy

Third: This would mean the heat would continue to stay in the container, leading to the frozen foods melting

Fourth: Correct, it reduces the amount of outside heat from entering the container, thus preventing melting

The foam helps by preventing the transfer of thermal energy from outside to inside the container. Option D is correct.

Therefore, the foam helps by preventing the transfer of thermal energy from outside to inside the container.

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Answer:

Sand would most likely be a homogeneous mixture

Answer:

150g

Explanation:

Assuming they are ideal gases at the same temperature and pressure, equal moles of gasses have equal volume. IN this case, if we have 10g of hydrogen gas, that is 5 moles of H2 gas. That means 5 moles og NO2 will occupy the same volume which is 5*(14.0 + 16.0*2) =  230 g