Consider this reaction: KOH + HBr ➝ KBr + H₂O


Which is the acid in this reaction?


A. KOH

B. HBr

C. KBr

D. H₂O

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

Electroplating is the process that uses electric current to reduce dissolved metal ions by the use of electrolysis, to obtain the dissolved metal ions at the other electrode, mostly in the format of a uniform coating.

Answer:

765.0 grams CuS

Explanation:

The limiting reagent is the reactant which completely reacts before the other reactant(s) is used up. When 9.0 moles Na₂S and 8.0 moles CuSO₄ react, it appears that CuSO₄ is the limiting reagent. You can tell because it results in the production of less product.

You can determine the mass of CuS by multiplying the moles by the molar mass. It is important to arrange the ratio in a way that allows for the cancellation of units.

Molar Mass (CuS): 95.62 g/mol

8.0 moles CuS               95.62 g
-------------------------  x  -----------------------  =  765.0 grams CuS
                                         1 mole

In this equilibrium system, the reaction is represented by the equation A(g) + B(s) + Energy ⇌ 3C(g). To shift the equilibrium system to the left, we need to consider Le Chatelier's principle, which states that a system at equilibrium will adjust itself to counteract any changes imposed upon it.

To begin with, adding more of gas C to the system would increase the concentration of C in the reaction mixture. According to Le Chatelier's principle, the system would respond by shifting the equilibrium position to the side that minimizes the change, in this case, the left side. Therefore, the equilibrium would shift to the left, favoring the formation of reactants A and B.

Heating the system is another factor to consider. Increasing the temperature of the system would add energy to the reaction mixture. Since the forward reaction is endothermic (absorbs energy), the system would respond by shifting the equilibrium to the right to absorb the excess heat. As a result, the equilibrium position would move away from the left side.

On the other hand, increasing the volume or removing some of gas C from the system would not directly affect the equilibrium position. Changes in pressure or volume only impact equilibrium systems involving gases if the number of moles of gas changes. Since adding or removing gas C does not alter the number of moles, these changes would not shift the equilibrium to either side.

In summary, adding more of gas C to the system and heating the system would both shift the equilibrium system to the left, favoring the formation of reactants A and B. Increasing the volume or removing some of gas C, however, would have no effect on the equilibrium position in this particular system.

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The correct answer is (c) Lower, because London dispersion forces among C2H5OH molecules are greater than those among CH3OH molecules.

The equilibrium vapor pressure of a liquid at a given temperature is determined by the strength of intermolecular forces present in the liquid. In this case, we are comparing the equilibrium vapor pressures of two alcohols, CH3OH (methanol) and C2H5OH (ethanol), at 300 K.Both methanol (CH3OH) and ethanol (C2H5OH) can form hydrogen bonds due to the presence of the hydroxyl (-OH) group. Hydrogen bonding is a strong intermolecular force.

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Answer:

NaNO3

Explanation:

NO3^-1 has a charge of minus 1.

Na^+1 has a charge of +1

When they combine, the charges are not noted. You get NaNO3

Sodium Nitrate

Answer:

This depicts an electrolytic cell.

Answer:

f4

Explanation:

your welcome.

Answer:

B

Explanation:

Answer:

information about elevation and slope

Explanation:

.

Answer:

3 atoms

Explanation:

A water molecule consists of three atoms an oxygen atom and two hydrogen atoms which are bond together like little magnets

Answer:

electric charges.

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.

An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

\( V = IR\)

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

0.10 M HCN and 0.10 M LiCN solution is a good buffer system among the given options.

A buffer system consists of a weak acid and its conjugate base. The main function of the buffer solution is to resist the change in pH. Among the given options the first option has HCN as acid and LiCN as the conjugate base. In the second option, HNO₃ is used as an acid, as HNO3 is a strong acid so it is not suitable for a good buffer solution. In the third option, HCl is used as an acid which is also a strong acid so not suitable for a buffer solution. In the last option again HNO₃ is used as an acid which is a strong acid. So the best option is the 1st one having HCN, which is a weak acid.

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A) In precipitation reaction when the solution is saturated, the expected concentration of both calcium ions and oxalate ions would be approximately 0.0192 mol/L.

B) After equilibrium is reestablished, the expected concentrations of calcium ions and oxalate ions are approximately 2.498 × 10⁻⁴ mol/L and 0.0192 mol/L, respectively.

To answer the given questions about the precipitation reaction of calcium oxalate, let's break it down into two parts:

A) The concentration of calcium ions and oxalate ions in the saturated solution can be determined when an excess amount of calcium oxalate is added to 100.0 mL of pure water.

Since excess calcium oxalate is added, it means that the solution will contain more calcium oxalate than what can dissolve. At saturation, the solution is in equilibrium with the solid calcium oxalate.

Let's assume the concentration of calcium ions and oxalate ions in the saturated solution is represented by "x" (in mol/L).

The equilibrium expression for the reaction is:

Ks = [Ca²⁺][C₂O₄²⁻]

Given that the equilibrium constant Ks = 3.7 × 10⁻⁴, we can set up the equation:

3.7 × 10⁻⁴ = x * x

Solving for "x," we find:

x = √(3.7 × 10⁻⁴) ≈ 0.0192 mol/L

Therefore, when the solution is saturated, the expected concentration of both calcium ions and oxalate ions would be approximately 0.0192 mol/L.

B) If 1.00 mg of calcium chloride (CaCl2) were added to the mixture, what would be the expected concentrations of calcium ions and oxalate ions once equilibrium is reestablished?

Since calcium chloride (CaCl₂) dissociates completely into calcium ions (Ca²⁺) and chloride ions (Cl⁻) in solution, the addition of 1.00 mg of CaCl₂ will result in the addition of 1.00 mg of calcium ions.

First, we need to convert the mass of calcium ions from mg to mol:

1.00 mg = 0.001 g

0.001 g / (molar mass of Ca²⁺) = 0.001 g / 40.08 g/mol ≈ 2.498 × 10⁻⁵ mol

Since the solution volume is assumed to be unchanged, the concentrations of calcium ions and oxalate ions will change but not the molar amounts.

The concentration of calcium ions is the molar amount (2.498 × 10^(-5) mol) divided by the total solution volume (100.0 mL or 0.100 L):

Concentration of calcium ions = (2.498 × 10⁻⁵ mol) / 0.100 L ≈ 2.498 × 10⁻⁴ mol/L

The concentration of oxalate ions remains the same as in part A since the addition of calcium chloride does not affect the concentration of oxalate ions.

Therefore, after equilibrium is reestablished, the expected concentrations of calcium ions and oxalate ions are approximately 2.498 × 10⁻⁴ mol/L and 0.0192 mol/L, respectively.

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The major products from the reaction of methyl butanoate with diisobutylaluminum hydride at -78 degrees Celsius, followed by acidic work-up, are 2-methylbutanol and isobutyl acetate.

1. Reaction with diisobutylaluminum hydride: Diisobutylaluminum hydride (DIBAL-H) is a strong reducing agent that can convert esters into alcohols. In this case, methyl butanoate undergoes reduction to form 2-methylbutanol.

2. Acidic work-up: After the reduction step, the reaction mixture is treated with an acidic solution. This step helps in the hydrolysis of any remaining DIBAL-H and in the conversion of the intermediate alkoxyaluminum species to the corresponding alcohol and aluminum hydroxide.

Overall reaction:

Methyl butanoate + Diisobutylaluminum hydride → 2-Methylbutanol + Aluminum hydroxide

Additional product: Isobutyl acetate may also be formed as a minor product, resulting from the reaction of diisobutylaluminum hydride with the carbonyl group of the ester.

It is important to note that the reaction conditions, such as temperature and reagent concentrations, can influence the selectivity and yield of the products. The specific reaction conditions used in the experimental setup can provide more detailed information about the major products obtained.

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The atomic mass of an element is its average atomic mass given in atomic mass units (amu, also known as daltons, D). The atomic mass, which is a weighted average of all the isotopes of that element, is calculated by multiplying the mass of each isotope by its abundance.

Calculate the average atomic mass of magnesium in nature.

24.31 is the average atomic mass of Magnesium in nature.

The ratio of neutrons to protons varies among isotopes, even though they all come from the same family of elements. The quantity of protons an element has affects its atomic number on the Periodic Table.

The information supplied indicates that

The sum of the relative abundance percentages of each isotope is the atomic mass. Therefore

Mg's atomic mass = (23.98×78.6)+(24.98×10.11)+(25.98×11.29)/100

Mg's atomic mass = 18.85+2.53+2.93 = 24.31

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The average atomic mass of an element, expressed in atomic mass units, is the element's atomic mass (amu, also known as daltons, D). The mass of each isotope is multiplied by its abundance to determine the atomic mass, which is a weighted average of all the isotopes of that element.

Magnesium has an average atomic mass of 24.31.

Despite belonging to the same family of elements, isotopes differ in the ratio of neutrons to protons. An element's atomic number on the Periodic Table is influenced by how many protons it contains.

The atomic mass is equal to the sum of the relative abundance percentages of each isotope. Thus, the atomic mass of magnesium

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The reaction is endothermic and absorbed N2 and O2 are reactants while NO is a product

An endothermic reaction is a chemical reaction that absorbs heat from the surroundings, resulting in an increase in the system's internal energy.

In other words, the energy of the products is greater than the energy of the reactants, and the reaction requires an input of heat to proceed. Endothermic reactions are characterized by a decrease in temperature of the surroundings.

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The percent mass of MgCl₂ in the mixture is 47.54%; option A.

The moles of chloride ion present in the original solid sample containing MgCl₂ is determined as follows:

Mass of AgCl precipitate = 1.032 g

Moles of AgCl = mass / molar mass

The molar mass of AgCl = 143.5 g/mol

Moles of AgCl = 1.032 / 143.5

Moles of AgCl = 0.00719 moles

Moles of Cl⁻ ions = 0.00719 moles

Moles of Cl⁻ ions in 1 mole MgCl₂ = 2 moles

Hence moles of MgCl in the solid sample = 0.00719 / 2 = 0.003595 moles

Mass of MgCl₂ in the sample = moles * molar mass

Molar mass of MgCl₂ = 95 g/mol

Mass of MgCl₂ = 0.003595 * 95

Mass of MgCl₂ = 0.3415 g

Percent mass of MgCl₂ in the sample = (0.3415 / 0.7209) * 100 %

Percent mass of MgCl₂ in the sample = 47.4%

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Answer:

The answer is 2

Explanation:

There are two energy sublevels in the second principal energy level. These two energy sublevels are 2s and 2p. The energy distribution in an atom is divided into a number of principal energy levels, and the principal energy levels are again divided into four basic energy sublevels.

The molecular formula for the compound is C₆H₁₅.

Given,

Mass of carbon = 41.33 g

Mass of hydrogen = 8.67

The molar mass of the compound = 87.178 g/mol

Moles of carbon = mass of carbon / molar mass of carbon

Moles of carbon = 41.33 / 12.01 = 3.443 moles

Moles of hydrogen = mass of hydrogen / molar mass of hydrogen

Moles of hydrogen = 8.67/ 1.01 = 8.594 moles

Ratio = Moles of carbon / Moles of hydrogen

Ratio = 3.443 moles / 3.443 moles = 1:2.5

The empirical formula shows that there is 1 carbon atom to 2.5 hydrogen atoms. It is required to multiply the subscripts by 2 to obtain whole numbers. Therefore, the empirical formula is C₂H₅.

Empirical formula mass = (2 × atomic mass of carbon) + (5 × atomic mass of hydrogen)

Empirical formula mass = (2 × 12.01 g/mol) + (5 × 1.01 g/mol) = 29.07 g/mol

Ratio = molar mass of the compound / empirical formula mass

Ratio = 87.18 / 29.07 = 3

Therefore, the molecular formula for the compound is (C₂H₅)₃, which simplifies it to C₆H₁₅.

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Answer:

something that is impossible

Answer:

Explanation:

A) bubbles show hydrogen gas escaping

B) the water reacted with sodium to form an alkaline solution

Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.

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Answer:

1. Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

2. It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

3. Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

4. The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

5. One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.

Answer:

potential energy (gravitational)

Explanation:

Potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height. If we think of the ground as the zero height, the height of the object is coming down from a positive height.  Wherever it is relative to the zero height, it is stored at that height, meaning that it is potential energy at that particular height.  When it moves to the ground, it becomes kinetic, by gravitational means.

Answer:

Potential

Explanation:

Answer:

1.25 moles

Explanation:

hope that helps :)

ps. im learning about that in school rn too

The empirical formula for given values is C₃H₅0₄ for the given compound containing water carbon di oxide .

The empirical fοrmula οf a chemical cοmpοund in chemistry is the simplest whοle number ratiο οf atοms present in the substance. As an example, the empirical fοrmula οf Sulphur mοnοxide, οr SO, is simply SO, as is the empirical fοrmula οf disulfur diοxide.

Thus, sulphur mοnοxide and disulfur diοxide, bοth sulphur and οxygen cοmpοunds, have the same empirical fοrmula. Their mοlecular fοrmulae, which express the number οf atοms in each mοlecule οf a chemical cοmpοund, are, hοwever, nοt identical.

The arrangement οr number οf atοms are nοt mentiοned in an empirical fοrmula. Many iοnic cοmpοunds, such as calcium chlοride and macrοmοlecules, such as silicοn diοxide, use it.

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Answer:

According to Dalton's law of partial pressures, the total pressure by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases. The partial pressure is defined as the pressure each gas would exert if it alone occupied the volume of the mixture at the same temperature.

A molecule's formal charge is the total of the formal charges of each of the constituent atoms that make up that particular molecule.

What is the Lewis structural rule?

Hydrogen atoms can only make one bond, and they are always located at the ends of atom chains. Hydrogen is usually associated with carbon, nitrogen, or oxygen. Oxygen atoms normally do not bond to one another, with the exception of O2, O3, superoxides, and peroxides.

Describe Lewis's structure with an example.

The octet rule, which states that atoms share electrons so that each has eight in its outer shell, is the foundation of a Lewis structure. For instance, the outer shell of an oxygen atom has six electrons.

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Answer:

Homeostasis, as currently defined, is a self-regulating process by which biological systems maintain stability while adjusting to changing external conditions.

Explanation:

Answer:

Chronic traumatic encephalopathy (CTE) is a progressive brain condition that's thought to be caused by repeated blows to the head and repeated episodes of concussion. It's particularly associated with contact sports, such as boxing or American football.

Explanation:

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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