If 36.42 mL of 3.500 M NaOH are required to neutralize 85.00 mL of a phosphoric acid solution in a titration, what is the concentration of the phosphoric acid solution? Include the appropriate symbol for the unit with your answer, but do not include the formula for phosphoric acid as part of your answer.


H3PO4 + 3 NaOH →


Na3PO4 + 3 H2O

The pair of resonance structures is represented by the choice: :0– Cl: and :N=0 Cl:

Resonance structures are different Lewis structures that can be drawn for a molecule or ion by rearranging the placement of electrons while keeping the same overall connectivity of atoms. Resonance structures are used to describe the delocalization of electrons within a molecule.

In the given choices, the only pair that represents resonance structures is: :0– Cl: and :N=0 Cl:. In this pair, the placement of electrons is rearranged while maintaining the connectivity of atoms. The first structure shows a double bond between oxygen and chlorine, while the second structure shows a double bond between nitrogen and chlorine.

The presence of resonance structures indicates the delocalization of electrons, where the electrons are not localized between specific atoms but are spread over multiple atoms. Resonance stabilization contributes to the overall stability of the molecule or ion.

Therefore, the pair of resonance structures is represented by the choice: :0– Cl: and :N=0 Cl:.

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The gas which would be most suitable for the product is Helium.

A gas is the third state of matter in which there is little intermolecular bonding between the molecules of the substance. Gases usually occupy their container and usually have low boiling point

So, the gas which would be most suitable for the product is Helium.

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Answer:

To hit someone on the head

Explanation:

self protection

Answer:

I'm sorry, I cannot provide exact temperature, salinity, or density values for specific ocean locations without further information. The values of these properties can vary greatly depending on many factors such as water depth, water circulation patterns, and local weather conditions. It is also worth noting that ocean temperature, salinity, and density can change over time and can fluctuate on a daily or seasonal basis.

Regarding the similarity in salinity in both areas, ocean salinity is primarily controlled by the balance between the input of freshwater from precipitation, rivers, and glaciers, and the output of salt through processes such as evaporation and the formation of sea ice. The similarity in salinity between two locations could be due to the presence of similar sources of freshwater or similar ocean circulation patterns that mix water from different sources and distribute salt and other dissolved substances evenly across the ocean. However, it is also possible that the salinity could be different due to other factors such as differences in ocean currents, water mixing, or local weather patterns.

Based on the standard free energies of formation, reactions B. and D. represent a feasible way to synthesize the product.

The feasible way to synthesize a product can be determined by examining the standard free energies of the formation of the reactants and products. A negative standard free energy of formation indicates that the compound is stable and feasible to form.

A. The standard free energy of formation of \(NO_2\) is positive (102.6 kJ/mol) , indicating that the reaction is not feasible.

B. The standard free energy of formation of \(Na_2O_2\) is negative(-451.0 kJ/mol), indicating that the reaction is feasible.

C. The standard free energy of formation of \(C_2H_4\) is positive( 68.20 kJ/mol), indicating that the reaction is not feasible.

D. The standard free energy of formation of CaO is negative(-604.0 kJ/mol), indicating that the reaction is feasible.

Therefore, the feasible reactions to synthesize the product are B and D.

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a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.

b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.

c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.

d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.

a) Melting:  Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.

b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.

c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.

d) Evaporation:  As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.

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Explanation:

hope it make sense to u :)

Answer:

E. the procedure

Explanation:

In scientific experiments, several steps are taken in order to achieve a significant result. However, the steps involved when performing the experiment should be taken note of and written down in a very comprehensible manner. The written step by step process involved in an experiment is called the PROCEDURE.

A procedure should be a guide to performing the experiment by a new experimenter. It should include everything done during the experiment. In this case, Mrs. Integer is telling Mrs. Apex to write down all she is doing during the experiment in a step by step manner. In essence, the principal is simply asking her to write a PROCEDURE.

Answer:

c

Explanation:

try it I'm 60%sur its this

Answer:

The earth is split into four major layers: the crust, the mantle, the outer core and the inner core

Explanation:

Answer:

2

Explanation:

The subscript on Ammoniumwhich is (NH4) is 2.

Hope this helped!

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."--

To calculate the volume percent of dioxane we will apply the following formula:

In this case, the solute will be dioxane, and the volume will be 69.3 mL.

To calculate the volume of solution we will sum both volumes:

Volume of solution = Volume of dioxane + Volume of Toluene

Volume of solution = 69.3 mL + 1300 mL

Volume of solution = 1369.3 mL

We are given all the data with a significant digit, therefore we must report the result also with a significant digit. So the answer will be.

The volume percent of dioxane in the solution is 5.1 %(v/v)

Answer:

Heat is the sum of all the kinetic energies of all the molecules of an object, while temperature is the average kinetic energy of the molecules of an object

Answer:

It is not clear from the given information what the claim, evidence, and reasoning would be for this scenario. Can you provide more context or information about the purpose of the experiment or what is being observed?

The KSCN solution concentrations will vary when determining the data for the equilibrium constant, but it will be a constant 0.0001 M KSCN when determining the data for the standard curve.

When determining the data for the equilibrium constant, I will use varying concentrations of KSCN solution to prepare reaction mixtures, but when determining data for the standard curve, I will use a constant 0.0001 M KSCN. b. When determining the data for the standard curve, I will dilute the Fe(NO3)3 solution from 0.1 M to 0.001 M before preparing reaction mixtures, but when determining data for the equilibrium constant I will use the 0.1 M Fe(NO3)3 solution directly.

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Explanation:

the answer is in the attachment

The comparison between the class barometer data and the air pressure shown in the weather report serves as a means to evaluate the accuracy and effectiveness of the barometer's measurements.

The comparison between the data from the class barometer and the air pressure shown in the weather report revealed a correlation between the two measurements. The class barometer readings were likely taken at the same time as the weather report's air pressure measurement to ensure accurate comparison.

If the class barometer readings closely matched the air pressure indicated in the weather report, it would suggest that the barometer was functioning correctly and providing reliable measurements. This would indicate that the class barometer could be used as a reliable tool for monitoring air pressure changes.

However, if there were significant discrepancies between the class barometer readings and the air pressure reported in the weather report, it could indicate a calibration issue with the barometer or potential inaccuracies in its measurements. In such a case, it would be necessary to investigate the reasons behind the discrepancies and determine the reliability of the class barometer for future use. It helps to determine the barometer's reliability as a tool for monitoring air pressure changes in the local environment.

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When two or more molecules interact, chemical changes take place at the molecular level.

The molecules in the reactants interact during a chemical reaction to create new compounds. No new material is created during a physical change, such as a state shift or dissolution. You may also assert that no atoms are generated or destroyed during a chemical reaction, so explain this.

The intermolecular interactions between the water molecules are weakening at the molecular level. The water molecules have access to enough energy from the heat to repel these forces. Intermolecular forces are either increased or decreased after every phase shift.

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As stated in the preceding statement Square pyramidal geometry describes the molecules.

An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.

The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.

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The empirical and molecular formula of a compound that has the aforementioned percentages are CClH₂ and C₂Cl₂H₄ respectively.

The empirical formula, which is a notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers, can be calculated as follows:

Next, we divide by the smallest mole value as follows:

The empirical ratio of Cl:C:H is 1:1:2, hence, the empirical formula is CClH₂.

The molecular formula can be calculated as follows:

{CClH₂}n = 98.96g/mol

(12 + 35.5 + 2)n = 98.96

49.5n = 98.96

n = 2

The molecular formula of the compound is C₂Cl₂H₄

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The empirical and molecular formula for the compound is CClH₂ and C₂Cl₂H₄ respectively.

Empirical formula is defined as a chemical formula where the number of atoms in the molecule is replaced by the most basic ratio of the elements in the compound.

Molecular formula is defined as a chemical formula that specifies how many atoms of each element there are in total in each substance's molecules.

Without respect to actual quantities, the empirical formula, which is a notation representing the ratios of the different elements contained in a compound, can be determined as follows:

71.65% Cl = 71.65g ÷ 35.5 = 2.02mol

24.27% C = 24.27g ÷ 12 = 2.0223mol

4.07% H = 4.07g ÷ 1 = 4.07mol

The smallest mole value is

Cl = 2.02mol ÷ 2.02 = 1

C = 2.0223mol ÷ 2.02 = 1

H = 4.07mol ÷ 2.02 = 2

So the empirical formula is CClH₂

The molecular formula can be calculated as

[CClH₂]n = 98.96g/mole

(12 + 35.5 + 2)n = 98.96

49.5n = 98.96

n = 2

So, the molecular formula is C₂Cl₂H₄

Thus, the empirical and molecular formula for the compound is CClH₂ and C₂Cl₂H₄ respectively.

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The characteristics of nuclear reactions allow to find the answers for the different questions are:

1) The total number of protons

2) The number of protons changes

3) Spontaneous emission of radiation

4) Sew one piece of fabric to another and form a larger one

5) There must be an unstable nucleus form in stable nuclei

6) The nuclei combine in a fusion reaction

7) There are no charged released

Nuclear reactions are the process by which atoms transform into other atoms, we fear two types of reactions:

It is asked to make a selection of which are the correct statements, for the different questions

1) In a nuclear reaction the amount of protons remains invariant, the neutral ones can be released or absorbed

The correct answer:  The total number of protons

2) A particula alpha is a nucleus with 2 protons, two neutrons, so it always changes from one element to another

The correct answer is: The number of protons changes

3) as described radioactive decay.

It is the process by which particles or radiation are emitted from the atomic nucleus

The correct answer is: Spontaneous emission of radiation

4) Fusion is a process by which two nuclei unite and a larger one is formed

The correct answer is: sew one piece of fabric to another and form a larger one

5) What to take into account when creating a disintegration model.

A mechanism must be created that allows the particle emission from the nucleus with the decrease of the total energy of the system

The correct answer is: There must be an unstable nucleus form in stable nuclei

6) Difference between fusion and chemical reaction

In the fusion other atoms are formed, in the chemical reaction the atoms remain unchanged

The correct answer is: The nuclei combine in a fusion reaction

7) How to describe the charged particles in the fusion

in a fusion reaction in general no charged particles are released, so all charged particles (protons are in the new nucleus

there is not image

The correct answer should be: There are no charged released

In conclusion with the characteristics of nuclear reactions lets find the results to the questions are:

1) The total number of protons

2) The number of protons changes

3) Spontaneous emission of radiation

4) Sew one piece of fabric to another and form a larger one

5) There must be an unstable nucleus form in stable nuclei

6) The nuclei combine in a fusion reaction

7) There are no charged released

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When ions are tightly attached to solvent molecules they are called as solvated ions.

When separation occurs, the solute is divided into ions or molecules, and every ion or molecule is surrounded by a solvent. The bonding between the solute particles and solvent molecules is called solvation. A solvated ion or molecule is surrounded by solvent molecules. For example, when we add NaCl to water, the NaCl molecules split into Na⁺ and Cl⁻ ions. These ions of sodium and chlorine then get surrounded by water molecules. We can call the ion water mixture a solution and the surrounded ions of sodium and chlorine as solvated ions.

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Answer:

The electronegativity difference of the atoms in the bond.

Explanation:

Carbon is electropositive while Oxygen is highly electronegative, hence highly polar due to strong intermolecular forces.

The molecule is not symmetrical because it's dipole moments don't cancel out.

Answer:

Adult tickets = A (cost $8)

student tickets = S (cost $4)

8(80) + 4(60) = 880

Explanation:

Substitution.

Adult tickets = A (cost $8)

student tickets = S (cost $4)

The drama class sold 20 more adult tickets than student tickets:

A = S + 20 (equation 1)

The class collected $880 from tickets:

8A + 4S = 880 (equation 2)

How many adult tickets were sold?

A = S + 20

8A + 4S = 880

we substitute the first equation into the second:

8(S+20) + 4S = 880  

8S + 160 + 4S = 880

12S = 720

S = 60

Next we find the adult tickets by substituting back:

A = S + 20

A = 60 + 20

A = 80

Check our answer by substituting our answers in equation 2:

8A + 4S = 880 (equation 2)

8(80) + 4(60) = 880

640 + 240 = 880

880 = 880

Answer:

4.86 × 10^-7m

Explanation:

Wavelength = C/f

C (Speed) of light = 3 × 10^8

f = 6.17 × 10^14

Wavelength = (3 × 10^8)/ (6.17 × 10^14)

= 4.86 × 10^-7m

Explanation:

Endogenous pathway for lipid metabolism: VLDL is formed in the liver from triglycerides and cholesterol esters. ... In the liver, LDL is converted into bile acids and secreted into the intestines. In non hepatic tissues, LDL is used in hormone production, cell membrane synthesis, or stored.

He gas therefore has a pressure of **3.47 atm** at a volume of 0.505L and a temperature of 20.0°C.

The force created when gas particles strike the container wall is known as a gas's pressure. It is a gauge for a gas's moving molecules' typical linear momentum. The pressure exerted on the wall is normal to it and acts perpendicularly; the viscosity of the gas influences the force's tangential (shear) component.

Equation PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is temperature, expresses the ideal gas law. The pressure of He gas can be calculated by using this equation and the given values as replacements as follows:

P = nRT/V

in which n = 0.108 mol

The universal gas constant is R, which equals 0.08206 L atm mol K-1.

T (temperature in Kelvin) = 20.0 + 273.15 K

V = 0.505 L

By replacing these values in the previous equation, we obtain:

P is calculated as follows:

(0.108 mol) x (0.08206 L atm mol-1 K⁻¹) x (20.0 + 273.15 K) / (0.505 L).

P = 3.47 atm

He gas therefore has a pressure of **3.47 atm**1 at a volume of 0.505L and a temperature of 20.0°C.

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the lattice energy of MgH2() is 2791 kJ/mol with a series of step when the Enthalpies of formation for calcium hydrided is given.

An article publishing charge (APC) is required of authors or research funders to cover publication costs in open access journals that do not charge subscription fees. This guarantees that everyone will be able to access your article promptly and without charge in the future.

Solution:

the lattice energy of MgH2() is :

ΔHf(−75. 3 kJ/mol )  =S+0.5D+IE+EA+U

ΔHf(−75. 3 kJ/mol )= 2791 kJ/mol

The papers published in MDPI Special Issues are of extremely high quality! When I published my research with MDPI (Energies Journal), it was a wonderful experience. Both the submission of the manuscript and the timing of publishing were excellent.

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