According to the following pKa values listed for a set of acids, which would lead to the strongest conjugate base? Select one: A. 4.7 B. 25 C. 50 D. -7 E. 16

Answer:

Fe(OH)2 + 2HCl ---> FeCl2 + 2H2O

I think

A species that contains a lone (unpaired) electron is referred to as a free radical.

The electron is a subatomic particle with a bad standard electric charge. Electrons belong to the primary technology of the lepton particle's own family and are typically thought to be fundamental particles because they have no recognized additives or substructure.

For most realistic purposes, an electron is a structureless particle with an intrinsic angular momentum or spin. simply two numbers — the electron's mass and its electric price — gasoline the equations that describe its behavior. From this 'sensible electron' version, physicists constructed present-day microelectronics.

By using the best values for the wavelength and the scattering by a matter of tough X-rays and ?-rays, the radius of the electron is anticipated as approximately 2 × 10-10 cm.

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Gram of CO₂ and g of H₂O are produced when 64.0g C₂H₂ burn in oxygen is CO₂ is 216 g and H₂O is 44.28 g

Gram is the unit of mass or weight that is used especially in the centimeter gram-second system of measurement

Here reaction is

2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

So, 1 mole of C₂H₂ = 2(12) + 2(1) = 26 g

1 mole of CO₂ = 12 + 2(16) = 44 g

1 mole of H₂O = 2(1) + 16 = 18 g

So, 64.0 g C₂H₂ × 1 mol/26g = 2.46 mol C₂H₂

2.46 mol C₂H₂ × 4CO₂/2C₂H₂ = 4.92 mole of CO₂

4.92 mole CO₂ × 44 g/mol = 216 g CO₂

64.0g C₂H₂×1 mol/26 g = 2.46 mol C₂H₂

2.46 mol C₂H₂×2H₂O/2 C₂H₂ = 2.46 mol H₂O

2.46 mol H₂O×18 g/mol = 44.28 g H₂O

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Answer:

\(pH = -log(H3O^+) = -log(8.52E-5) = 4.+\), my guess is about 4.1

Explanation:

hope this helps! :)

Mxene as electro catalyst also have shown productive outcomes and stable performances due to their prominent electrical conductivity and hydrophilic surface.

Mxene are a class of two dimensional inorganic compound called mxene. because of its origin from the process of etching and exfoliating. automatically thin layers of aluminum from layered carbides. oxygen evolution reaction (OER) is cornerstone reaction of many renewable energy technologies. Cost-effective yet efficient electro catalysts are critical to overcome the high overpotential and sluggish kinetics of this process new type of non-precious metal electro catalyst for OER by synergistically coupling layered double hydroxides (LDH) with two-dimensional (2D) mxene with high conductivity and active surface.

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The acceleration of the plane : -2 m/s²(negative=deceleration)

Given

vo=245 m/s

vt=230 m/s

t = 7 s

Required

The acceleration

Solution

Motion with constant acceleration

\(\tt v_t=v_o+at\)

Input the value

\(\tt 230=245+a.7\\\\-15=7a\Rightarrow a=-2.14\approx rounded~-2~m/s^2\)

Answer:

Explanation:

Edge 2020

From what we know we can confirm that currently, the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.

From what we know, this compound has proved to be quite toxic for humans to breathe. Increased concentrations of this in the atmosphere lead to increased rates of lung disease among other health complications.

Therefore, we can confirm that the primary source of sulfur dioxide of emissions into the atmosphere is coal and other fossil fuel burning in industry.

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Sulfuric acid can dissociate into hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−).

Sulfuric acid is a very strong acid which ionizes into hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−) while on the other hand, in dilute solutions the hydrogen sulfate ions also dissociate, forming more hydronium ions and sulfate ions (SO42−).

So we can conclude that Sulfuric acid can dissociate into hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−).

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Answer:

it's an acid

Explanation:

because itis soda

The final temperature of the mixture is 20.7°C.

When a 50.0 g sample of aluminum at 90.0°C is added to a 250.0 g sample of water at 15.0°C, the final temperature of the mixture can be determined using the equation for specific heat capacity (Q = mcΔT). Firstly, we need to determine the amount of heat released by the aluminum: Q1 = m1c1ΔT1= 50.0 g × 0.903 J/g°C × (90.0°C - T).

Next, we determine the amount of heat absorbed by the water: Q2 = m2c2ΔT2= 250.0 g × 4.184 J/g°C × (T - 15.0°C)Since the heat gained by the water equals the heat lost by the aluminum, we can set Q1 equal to Q2:50.0 g × 0.903 J/g°C × (90.0°C - T) = 250.0 g × 4.184 J/g°C × (T - 15.0°C). Solving for T, we get:T = 20.7°C. Therefore, the final temperature of the mixture is 20.7°C.

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At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

V₁/T₁ = V₂/T₂

Given that;

If final volume is double of initial volume.

V₁/T₁ = V₂/T₂

V₁T₂ = V₂T₁

T₂ = V₂T₁ / V₁

T₂ = ( 1000cm³ × 25°C ) / 500cm³

T₂ = 25000m³°C / 500cm³

T₂ = 50°C

At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.

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The following has the least effect on the solubility of a solid in a liquid solvent: pressure, The correct option is C.

The solubility of a solid in a liquid solvent is primarily influenced by temperature, the nature of the solvent, and the nature of the solute. Pressure, on the other hand, has the least effect on the solubility of a solid in a liquid solvent.

Temperature plays a significant role in solubility. In general, the solubility of most solid solutes in liquid solvents increases with an increase in temperature. This is because higher temperatures provide more energy for the solute particles to overcome intermolecular forces and dissolve in the solvent.

The nature of the solvent also affects solubility. Different solvents have different polarities and intermolecular forces, which can interact differently with solute particles. Solvents with similar polarities or chemical properties to the solute tend to have higher solubilities.

The nature of the solute can also impact solubility. The chemical composition and physical properties of the solute, such as its polarity, molecular size, and crystal structure, can influence how well it dissolves in a particular solvent.

In contrast, pressure has a negligible effect on the solubility of a solid in a liquid solvent, except in certain specific cases such as when the solute undergoes a change in volume upon dissolution.

For most common solid solutes, changes in pressure have minimal impact on solubility compared to temperature, solvent nature, and solute nature. The correct option is C.

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Complete question:

Which of the following has the least effect on the solubility of a solid in a liquid solvent?

A. temperature

B. nature of the solvent

C. pressure

D. nature of the solute

A sudden increase in end-tidal CO2 (carbon dioxide) levels may be the earliest indicator of respiratory distress or failure.

End-tidal CO2 refers to the partial pressure or concentration of CO2 at the end of an exhaled breath. It is a reflection of the CO2 levels in the bloodstream. In a healthy individual, end-tidal CO2 levels are relatively stable and within a normal range. However, a sudden increase in end-tidal CO2 can indicate a problem with respiratory function. It may suggest that the body is not effectively eliminating CO2, which can occur in conditions such as hypoventilation, airway obstruction, respiratory muscle weakness, or respiratory failure.Monitoring end-tidal CO2 is commonly done in medical settings, especially during anesthesia or critical care, as it provides valuable information about a patient's ventilation and respiratory status. Detecting an abrupt increase in end-tidal CO2 can prompt early intervention and treatment to prevent further respiratory compromise and improve patient outcomes.

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Answer:

Pb, Sn, Te, S, Cl

Explanation:

The rate of diffusion of butane gas at the same temperature is approximately 240 m/s.

The rate of diffusion of a gas is directly proportional to its velocity at a given temperature. Therefore, we can use the ratio of the velocities of neon and butane gases to estimate the rate of diffusion of butane gas.

The molar mass of neon is 20.18 g/mol, and the molar mass of butane is 58.12 g/mol. Since both gases are at the same temperature, their velocities are proportional to the square root of the ratio of their molar masses:

\(\sqrt{(20.18 g/mol / 58.12 g/mol) }\)≈ 0.534

Therefore, we can estimate that the rate of diffusion of butane gas is about 0.534 times the velocity of neon gas. Multiplying the velocity of neon gas by this ratio, we get:

449 m/s x 0.534 ≈ 240 m/s

So, we can estimate that the rate of diffusion of butane gas at the same temperature is approximately 240 m/s.

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After drawing the lewis structure, the correct answer for the associated molecular geometry of SiF4 is:

e. tetrahedral

To draw the Lewis structure of silicon tetrafluoride (SiF4), we first need to determine the total number of valence electrons.

Silicon (Si) is in Group 14 of the periodic table, so it has 4 valence electrons. Fluorine (F) is in Group 17 and has 7 valence electrons. Since there are four fluorine atoms, the total number of valence electrons is 4 (from Si) + 4 (from F) = 8.

To form the Lewis structure, we place the silicon atom in the center and surround it with four fluorine atoms, each bonded to the silicon atom.

The structure is as follows:

          F

          |

   F – Si – F

          |

         F

Each fluorine atom is single-bonded to the silicon atom, and all bonds are represented by lines (-). Silicon shares one electron with each fluorine atom, fulfilling the octet rule for each atom.

Now, to determine the associated molecular geometry, we can use the VSEPR (Valence Shell Electron Pair Repulsion) theory. According to VSEPR, the arrangement of the four electron pairs around the silicon atom will be tetrahedral.

Therefore, the correct answer for the associated molecular geometry of SiF4 is:

e. tetrahedral

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Answer:

ahhh....Double displacement reaction or precipitation reaction.(both are correct im not guessing)

Answer:

14.5 moles of CH4

Explanation:

There is 14.5 moles of carbon in the product CO2....there has to be 14.5 moles of carbon in the reactant CH4

   14.5 moles

Answer: To prepare 1.15 L of 0.100 M Nitric Acid from a 70.3% by mass concentrated solution with a density of 1.41 g/ml, you must use 2.765 g of the concentrated solution.

In order to prepare 1.15 L of 0.100 M Nitric Acid from a 70.3% by mass concentrated solution with a density of 1.41 g/ml, you need to first calculate the moles of Nitric Acid present in the 1.15 L of the solution. To do this, multiply the density of the solution (1.41 g/ml) by the volume of the solution (1.15 L) to obtain the mass of the solution (1.615 g). Then, divide the mass of the solution (1.615 g) by the molar mass of Nitric Acid (63.01 g/mol) to obtain the number of moles present in the solution (0.02547 moles).

Next, you must determine the volume of the concentrated solution required to obtain 0.100 M of Nitric Acid in 1.15 L of the solution. To do this, divide the number of moles of Nitric Acid required in the solution (0.100 moles) by the number of moles of Nitric Acid present in the 1.15 L solution (0.02547 moles) to obtain the volume of the concentrated solution needed (3.933 L).

Finally, you can calculate the amount of the concentrated solution required to make the desired 1.15 L of 0.100 M Nitric Acid solution. To do this, multiply the volume of the concentrated solution required (3.933 L) by the mass percentage of the concentrated solution (70.3%) to obtain the mass of the concentrated solution needed (2.765 g).

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The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)

First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams

Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.

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Answer:

The mole and Avogadro’s number are two important concepts of science that provide a link between the properties of individual atoms or molecules and the properties of bulk matter. It is clear that an early theorist of the idea of these two concepts was Avogadro. However, the research literature shows that there is a controversy about the subjects of when and by whom the mole concept was first introduced into science and when and by whom Avogadro’s number was first calculated. Based on this point, the following five matters are taken into consideration in this paper. First, in order to base the subject matter on a strong ground, the historical development of understanding the particulate nature of matter is presented. Second, in 1811, Amedeo Avogadro built the theoretical foundations of the mole concept and the number 6.022 × 1023 mol−1. Third, in 1865, Johann Josef Loschmidt first estimated the number of molecules in a cubic centimetre of a gas under normal conditions as 1.83 × 1018. Fourth, in 1881, August Horstmann first introduced the concept of gram-molecular weight in the sense of today’s mole concept into chemistry and, in 1900, Wilhelm Ostwald first used the term mole instead of the term ‘gram-molecular weight’. Lastly, in 1889, Károly Than first determined the gram-molecular volume of gases under normal conditions as 22,330 cm3. Accordingly, the first value for Avogadro’s number in science history should be 4.09 × 1022 molecules/gram-molecular weight, which is calculated by multiplying Loschmidt’s 1.83 × 1018 molecules/cm3 by Than’s 22,330 cm3/gram-molecular weight. Hence, Avogadro is the originator of the ideas of the mole and the number 6.022 × 1023 mol−1, Horstmann first introduced the mole concept into science/chemistry, and Loschmidt and Than are the scientists who first calculated Avogadro’s number. However, in the science research literature, it is widely expressed that the mole concept was first introduced into chemistry by Ostwald in 1900 and that Avogadro’s number was first calculated by Jean Baptiste Perrin in 1908. As a result, in this study, it is particularly emphasised that Horstmann first introduced the mole concept into science/chemistry and the first value of Avogadro’s number in the history of science was 4.09 × 1022 molecules/gram-molecular weight and Loschmidt and Than together first calculated this number.

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The pKa of a weak acid can be determined from the titration curve by identifying the equivalence point, half-equivalence point, and buffering region, and using the Henderson-Hasselbalch equation.


Titration curves represent the changes in pH and concentration of a solution as an acid or base is titrated with a solution of known concentration. The pKa of a weak acid can be determined from the titration curve by identifying the equivalence point, half-equivalence point, and buffering region. The equivalence point is where the acid has been completely neutralized and is indicated by a sharp increase in pH. The half-equivalence point is where half of the acid has been neutralized and is indicated by a buffering region. The buffering region is a region on the titration curve where small additions of acid or base do not significantly change the pH.  

The pKa of the weak acid can be calculated using the Henderson-Hasselbalch equation, which relates the pH of the buffering region to the pKa of the weak acid and the concentration of the acid and its conjugate base. The equation is:  

pH = pKa + log([A-]/[HA])

where pH is the pH of the buffering region, pKa is the dissociation constant of the weak acid, [A-] is the concentration of the acid's conjugate base, and [HA] is the concentration of the weak acid.

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Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

Answer:

23.9g of Fe₂O₃ are produced

Explanation:

Are formed when 16.7g of Fe reacts completely...

Based on the reaction:

4Fe + O₃ → 2Fe₂O₃

4 moles of Iron react per 1 mole of O₃ producing 2 moles of Fe₂O₃.

To solve this question we need to convert the mass of iron to moles. The ratio of reaction is 2:1 -That is, 2 moles of Fe produce 1 mole of Fe₂O₃-. Thus, we can find the moles of Fe₂O₃ produced and its mass:

Moles Fe -Molar mass: 55.845g/mol-:

16.7g Fe * (1mol / 55.845g) = 0.299 moles of Fe

Moles Fe₂O₃:

0.299 moles Fe * (2 mol Fe₂O₃ / 4 mol Fe) = 0.150 moles Fe₂O₃

Mass Fe₂O₃ -Molar mass 159.69g/mol-:

0.150 moles Fe₂O₃ * (159.69g / mol) =

Number of protons n one atom of Calcium 39 is 20.

Number of protons in any element is equal to its atomic number. Since the atomic number of calcium is 20, hence, the number of protons is also 20. To balance the positive charge, the atoms contain same number of electrons. Thus, number of electrons in given atom of calcium will also be 20.

The number of neutrons is calculated by performing subtraction between mass number and number of protons. The number of neutrons is indicative of the isotope of atom, as it changes with the mass of an atom.

Calcium is an alkaline earth metal. The smallest unit of matter is atom which can occur either in neutral state or in ionized state.  

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Answer:

C2H3O2^-(aq) + H^+ —> HC2H3O2

Explanation:

The following equation was given in the question:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

Now, to obtain the net ionic equation, we simply cancel out the ions common to both side of the equation.

A careful observation of the equation above, shows that sodium ion, Na^+ and chloride ion, Cl^- are common to both side of the equation.

Therefore, to obtain the net ionic equation, we simply cancel out Na^+ and Cl^- from both side of the equation. This is illustrated below:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

C2H3O2^-(aq) + H^+ —> HC2H3O2

Therefore, the net ionic equation is

C2H3O2^-(aq) + H^+ —> HC2H3O2

According to Collins CH, Allwood MC, Bloomfield SF, Fox A, eds. Disinfectants: Their Use and Evaluation of Effectiveness, the stability of sodium hypochlorite solutions varies depending on various factors.

Sodium hypochlorite is a greenish-yellow liquid that is used as a bleaching agent and disinfectant. Sodium hypochlorite, also known as bleach, is used to clean and sanitize surfaces and water systems, as well as treat wastewater. Sodium hypochlorite is a compound that has a short shelf life and loses strength over time due to various factors.

Sodium hypochlorite's stability factors-

1. Light: Sodium hypochlorite solutions decompose quickly when exposed to light, which breaks down the hypochlorite ion, resulting in lower levels of available chlorine.

2. Temperature: The rate of decomposition of sodium hypochlorite is also influenced by temperature, with higher temperatures hastening the process.

3. pH: At higher pH levels, the hypochlorite ion decomposes into chlorate and chloride ions, which reduces the chlorine content of the solution.

4. Contaminants: Certain contaminants, such as metals and organic materials, can interfere with the stability of sodium hypochlorite solutions and reduce their effectiveness.

5. Concentration: Sodium hypochlorite solutions with a lower concentration are more stable than those with a higher concentration.

Therefore, the stability of sodium hypochlorite solutions varies depending on various factors such as light, temperature, pH, contaminants, and concentration.

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