15.91 kilometers to meters

Answer:

1476.43 cm

Explanation:

From the question given above, the following data were obtained:

Diameter = 1 mm

Number of mole of Au = 1 mole

Density of Au = 17.0 g/cm³

Length of wire =?

Next, we shall determine the mass of 1 mole of Au. This can be obtained as follow:

Number of mole of Au = 1 mole

Molar mass of Au = 197 g/mol

Mass of Au =?

Mole = mass / Molar mass

1 = mass of Au / 197

Mass of Au = 1 × 197

Mass of Au = 197 g

Next, we shall determine the volume of the Au. This can be obtained as follow:

Density of Au = 17.0 g/cm³

Mass of Au = 197 g

Volume of Au =

Density = mass /volume

17 = 197 / Volume of Au

Cross multiply

17 × volume of Au = 197

Divide both side by 17

Volume of Au = 197 / 17

Volume of Au = 11.59 cm³

Next, we shall determine the radius of the gold wire. This can be obtained as follow:

Diameter = 1 mm

Radius =?

Radius = Diameter /2

Radius = 1/2

Radius = 0.5 mm

Converting 0.5 mm to cm, we have:

10 mm = 1 cm

Therefore,

0.5 mm = 0.5 mm × 1 cm / 10 mm

0.5 mm = 0.05 cm

Thus, the radius of the gold wire is 0.05 cm

Finally, we shall determine the length of the wire. This can be obtained as follow:

Volume of Au (V) = 11.59 cm³

Radius (r) = 0.05 cm

Pi (π) = 3.14

Length (L) =?

V = πr²L

11.59 = 3.14 × 0.05² × L

11.59 = 3.14 × 0.0025 × L

11.59 = 0.00785 × L

Divide both side by 0.00785

L = 11.59 / 0.00785

L = 1476.43 cm

Thus, the length of the gold wire is 1476.43 cm

The statement “the yeast engages in photosynthesis, which produces oxygen gas” is incorrect. Yeast cells do not engage in photosynthesis to produce oxygen gas.

Photosynthesis is the process by which green plants use sunlight, carbon dioxide, and water to produce glucose (a simple sugar), which serves as food for the plant.

Oxygen is also produced during photosynthesis.Yeast:Yeast is a unicellular fungus that converts sugar into carbon dioxide and alcohol. Yeast cells respire aerobically in the presence of oxygen and anaerobically in the absence of oxygen.

However, yeast cells do not perform photosynthesis. They do not have chloroplasts or pigments that are required for photosynthesis. Therefore, yeast cells cannot produce oxygen gas.Bio quizlet:Quizlet is an online learning platform that allows users to create and share flashcards, study guides, and quizzes.

It is a great resource for studying biology and other subjects. Students can create their own study materials or use existing ones created by other users. Quizlet provides an engaging and interactive way to learn and retain information.

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Answer:

HCL, H2

Explanation:

Assuming this is a Redox reaction, we know that metal + acid = salt + hydrogen therefore we can say it is HCL and H2

Answer:

see explanation and punch in the numbers yourself ( will be better for your test)

Explanation:

If you are given atoms you need to divide by Avogadro's number 6.022x10^23

then you will have moles of sulfur-- once you have moles multiply by the molar mass of sulfur to go from moles to grams

mm of sulfur is 32 g/mol

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the grams of sulfur in  1.9x10²³ atoms of sulfur is 9.92g.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance.

Given number of atoms= 1.9x10²³atoms

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

Substituting the values

mole=1.9x10²³÷ 6.022×10²³

mole = 0.31 mole of sulfur

Mole = given mass÷ Molar mass

Molar mass of sulfur=32g/mol

mass of sulfur =0.31 mole ×32g/mol

mass of sulfur=9.92g

Therefore, the grams of sulfur in  1.9x10²³ atoms of sulfur is 9.92g.

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Moles (mol) is a unit of measurement in chemistry that represents the amount of a substance. Hence, 0.002 moles of NaOH are required. 4.0 mL of 0.50 M NaOH is required to neutralize 20.0 mL of 0.10 M acetic acid.

To calculate the moles in a solution, we can use the formula:

Moles = Concentration (M) x Volume (L)

(a) Moles in 50.0 mL of 0.25 M NaOH:

Concentration = 0.25 M

Volume = 50.0 mL = 50.0 / 1000 L = 0.050 L

Moles = 0.25 M x 0.050 L = 0.0125 moles

Therefore, there are 0.0125 moles of NaOH in 50.0 mL of 0.25 M NaOH.

(b) Volume of 0.50 M NaOH needed to neutralize 20.0 mL of 0.10 M acetic acid:

To determine the volume of NaOH needed, we need to use the stoichiometry of the balanced equation between NaOH and acetic acid.

The balanced equation is:

CH3COOH + NaOH -> CH3COONa + H2O

From the equation, we can see that the mole ratio between acetic acid (CH3COOH) and NaOH is 1:1.

The concentration of acetic acid = 0.10 M

Volume of acetic acid = 20.0 mL = 20.0 / 1000 L = 0.020 L

Moles of acetic acid = 0.10 M x 0.020 L = 0.002 moles

Since the mole ratio is 1:1, we need an equal number of moles of NaOH to neutralize the acetic acid.

Therefore, we need 0.002 moles of NaOH.

To find the volume of 0.50 M NaOH needed to obtain 0.002 moles, we can rearrange the formula:

Volume = Moles / Concentration

Concentration of NaOH = 0.50 M

Volume = 0.002 moles / 0.50 M = 0.004 L = 4.0 mL

Therefore, 4.0 mL of 0.50 M NaOH is required to neutralize 20.0 mL of 0.10 M acetic acid.

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Answer:

The value for the equilibrium constant for the reaction \(2SO2(g)+O2(g) <=> 2SO3(g) Kc=4.0*10^24\\\) at 298K .

What would be the value for the equilibrium constant for the following reaction at the same temperature?

\(2SO3(g) <=> 2SO2(g)+O2(g)\)

Explanation:

The Kc value for the reverse reaction of the first reaction that is:

\(2SO2(g)+O2(g) <=> 2SO3(g) Kc=4.0*10^{24}\\\)

\(Kc=\frac{SO3^{2} }{SO2^{2}.O2 }\)

For the reverse reaction,

\(2SO3(g) <=> 2SO2(g)+O2(g)\)

\(Kc=\frac{SO2^{2}O2 }{SO3^{2}. }\)

So, it is the inverse of the first Kc value.

Hence, the new Kc value is:

\(Kc=\frac{1}{4.0*10^{24} } \\ =2.5*10^{-25}\)

Answer is :

Kc=2.5*10^-25.

ANSWER:

B. been incredibly dense? I'm not sure sorry

Answer:

hope this helps

Explanation:

it has to do with crystallization in the wax. When solid, the long alkyl chains align and crystallize, and these crystallites scatter light which leads to higher opacity. When heated, the crystallites melt, and the resulting amorphous liquid no longer scatters light.

We know that water is tasteless, odorless, and transparent. In small quantities, it is also colorless. However, when a large amount of water is observed, as in a lake or the ocean, it is actually light blue in color. The blue hue of water is an intrinsic property and is caused by selective absorption and scattering of white light. These and other properties of water depend on its chemical structure.The transparency of water is important for organisms that live in water. Because water is transparent, sunlight can pass through it. Sunlight is needed by water plants and other water organisms for photosynthesis.Chemical Structure of WaterEach molecule of water consists of one atom of oxygen and two atoms of hydrogen, so it has the chemical formula H2O. The arrangement of atoms in a water molecule explains many of water’s chemical properties. In each water molecule, the nucleus of the oxygen atom (with 8 positively charged protons) attracts electrons much more strongly than do the hydrogen nuclei (with only one positively charged proton). This results in a negative electrical charge near the oxygen atom (due to the "pull" of the negatively charged electrons toward the oxygen nucleus) and a positive electrical charge near the hydrogen atoms. A difference in electrical charge between different parts of a molecule is called polarity. A polar molecule is a molecule in which part of the molecule is positively charged and part of the molecule is negatively charged.

•Hydrogen Bonding-

Opposite electrical charges attract one another. Therefore, the positive part of one water molecule is attracted to the negative parts of other water molecules. Because of this attraction, bonds form between hydrogen and oxygen atoms of adjacent water molecules. This type of bond always involves a hydrogen atom, so it is called a hydrogen bond. Hydrogen bonds are bonds between molecules, and they are not as strong as bonds within molecules. Nonetheless, they help hold water molecules together.

•Sticky, Wet Water-

Water has some unusual properties due to its hydrogen bonds. One property is cohesion, the tendency for water molecules to stick together. The cohesive forces between water molecules are responsible for the phenomenon known as surface tension. The molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface. For example, if you drop a tiny amount of water onto a very smooth surface, the water molecules will stick together and form a droplet, rather than spread out over the surface. The same thing happens when water slowly drips from a leaky faucet. The water doesn't fall from the faucet as individual water molecules but as droplets of water.

•Density of Ice and Water-

The melting point of water is 0°C. Below this temperature, water is a solid (ice). Unlike most chemical substances, water in a solid state has a lower density than water in a liquid state. This is because water expands when it freezes. Again, hydrogen bonding is the reason. Hydrogen bonds cause water molecules to line up less efficiently in ice than in liquid water. As a result, water molecules are spaced farther apart in ice, giving ice a lower density than liquid water. A substance with lower density floats on a substance with higher density. This explains why ice floats on liquid water, whereas many other solids sink to the bottom of liquid water.In a large body of water, such as a lake or the ocean, the water with the greatest density always sinks to the bottom. Water is most dense at about 4°C. As a result, the water at the bottom of a lake or the ocean usually has temperature of about 4°C. In climates with cold winters, this layer of 4°C water insulates the bottom of a lake from freezing temperatures. Lake organisms such as fish can survive the winter by staying in this cold, but unfrozen, water at the bottom of the lake.

Hope it helps

After using an ordinary peeling solution, it is important to apply a moisturizer or hydrating serum to the skin.

The ordinary peeling solution is a chemical exfoliant that helps remove dead skin cells and impurities from the surface of the skin. It is a powerful treatment that can leave the skin feeling dry and sensitive. Therefore, it is important to follow up with a hydrating product to restore the skin's moisture barrier and prevent irritation. The peeling solution contains alpha hydroxy acids (AHAs) and beta hydroxy acids (BHAs) that work to exfoliate the skin. These acids dissolve the bonds between dead skin cells, making them easier to slough off. This helps to unclog pores, smooth out rough texture, and even out skin tone .However, AHAs and BHAs can also strip away the skin's natural oils, leading to dryness and irritation. To counteract this, it is recommended to apply a moisturizer or hydrating serum after using the peeling solution. This will help to soothe and nourish the skin, while also locking in moisture and restoring the skin's natural pH balance.

In summary, it is important to apply a moisturizer or hydrating serum after using an ordinary peeling solution to prevent dryness and irritation. This will help to restore the skin's moisture barrier and keep it looking healthy and radiant.

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Answer:

150,000 Joules

Explanation:

KE= 1/2 *mv^2

1/2 * 120 *50^2

60*2500

150,000 Joules

Hope this helps :)

The increasing order of standard molar entropy (S°) is as follow:

ribose ( C₅H₁₀O₅ ) < Glucose (C₆H₁₂O₆) < sucrose ( C₁₂H₂₂O₁₁ )

Entropy is defined as the randomness of the particle. It depends on temperature and pressure or number of particle per unit volume.

It is directly proportional to the temperature and pressure of the gas.

The standard molar entropy is defined as the entropy content of the one mole of pure substance at the standard state of temperature and pressure of interest.

The standard molar entropy is also defined as the total amount of entropy which 1 mole of the substance acquire, as it is brought from 0K to standard conditions of temperature and pressure.

The standard molar entropy depends on the molas mass of atom, molecules or compound.

ribose ( C₅H₁₀O₅ ) has lower standard molar entropy. Due to less complexity of this molecules.

While, complexity increases from Glucose (C₆H₁₂O₆) to sucrose ( C₁₂H₂₂O₁₁ ). Therefore, the standard molar entropy of sucrose ( C₁₂H₂₂O₁₁ ) is greater than Glucose (C₆H₁₂O₆).

Thus, we concluded that the increasing order of standard molar entropy (S°) is as follow:

ribose ( C₅H₁₀O₅ ) < Glucose (C₆H₁₂O₆) < sucrose ( C₁₂H₂₂O₁₁ )

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Answer:

The correct answer is - D C2H4.

Explanation:

Saturated hydrocarbons are hydrocarbons with single covalent C-C bonds. They are known as alkanes. The general formula for these hydrocarbons is  CnH2n+2

Unsaturated hydrocarbons the hydrocarbons with double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is  CnH2n and CnHn-2

For the given options:

Option D: C2H4, is the simplest alkene with a double bond so it is an unsaturated hydrocarbon.

Mass of Li₂O= 719.809 g

Given

1,060 g of CO₂

Required

Mass of Li₂O

Solution

Reaction

Possible compound : Li₂O

Li₂O(aq) + CO₂(g) → Li₂CO₃(aq)

mol CO₂(MW=44 g/mol) :

= 1,060 g : 44 g/mol

= 24.09

From the equation, mol ratio of LiO : CO₂ = 1 : 1, so mol Li₂O : 24.09

Mass Of Li₂O(MW=29.88 g/mol) :

= mol x MW

= 24.09 x 29.88

= 719.809 g

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of aluminum = 12 cm³

Density = 2.70 g/cm³

The mass of aluminum is

mass = 2.7 × 12

We have the final answer as

Hope this helps you

A silver precipitate is created when silver nitrate, AgNO3, and magnesium bromide, MgBr2, are combined in aqueous solutions.Create the net ionic equation as well as the balanced formula equation for this reaction.

The end products of the reaction between aqueous systems of magnesium chloride (MgCl2) and silver nitrate (AgNO3) are solid silver chloride and aqueous magnesium nitrate.

The right response is (CH3)3C-Cl.The most reliable 3° carbocation is formed by tert-butyl chloride, or (CH3)3C - Cl.As a result, it will immediately produce the white precipitate of AgCl in AgNO3 solution.

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When a solid changes into a liquid, the particles of the solid move farther apart and gain kinetic energy. Therefore, the statement that is true about the particles of a solid when the solid changes into a liquid is: their kinetic energy increases.

What is Kinetic Energy?

It is a scalar quantity and is dependent on the mass and velocity of an object. The formula for kinetic energy is:

Kinetic energy = (1/2) * mass * velocity^2

In a solid, the particles are tightly packed and vibrate in a fixed position. When the solid is heated or the pressure is reduced, the kinetic energy of the particles increases and they begin to vibrate faster and move slightly away from their fixed positions. This causes the solid to start melting and the particles begin to slide over each other, forming a liquid. Therefore, the particles of the solid move apart and gain kinetic energy when the solid changes into a liquid.

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The synthesis of aromatic 1,2-amino alcohols using a bienzymatic dynamic kinetic asymmetric transformation (bienzymatic DKAT) is a 3 step process involving synthesis of ketones, enantioselective reduction of lactols and synthesis of aromatic 1,2-amino alcohols

Step-by-step method :

Step 1: Synthesis of ketones

Starting with a ketone as the substrate, add the enzyme galactose oxidase (GOx) and an oxidant such as sodium periodate (NaIO4) to convert the ketone to a lactol. This transformation takes place at room temperature in a mixture of water and tetrahydrofuran (THF). The reaction mixture was then filtered to remove any precipitate, and the aqueous phase was extracted with ethyl acetate (EtOAc) to give the product in good yield.

Step 2: Enantioselective reduction of lactols

Use the enzyme alcohol dehydrogenase (ADH) and an NADH cofactor to perform an enantioselective reduction of lactols. This transformation takes place at room temperature in a mixture of water and isopropanol (IPA). The product is a chiral alcohol with high enantioselectivity.

Step 3: Synthesis of aromatic 1,2-amino alcohols

The chiral alcohol can be transformed into an amino alcohol using a reductive amination reaction with ammonia or an amine. This transformation takes place at room temperature in a mixture of water and ethanol (EtOH) or isopropanol (IPA). The resulting product is a 1,2-amino alcohol with high diastereoselectivity and enantioselectivity. This bienzymatic DKAT method is an effective and efficient way to synthesize aromatic 1,2-amino alcohols.

Thus, the step-by-step method of synthesis of aromatic 1,2-amino alcohols using a bienzymatic dynamic kinetic asymmetric transformation is explained above.

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Answer:

halogens

hope its right

Answer:

there combine with an acid called sodium chloride or magnesium sulphate

The solutions of NaOH and HCl can simply be made with careful weighing of reagents because both of these substances are pure and have known chemical formulas.

However, they need to be standardized because the concentration of the solution may not be exactly what it is supposed to be due to measurement errors or impurities in the reagents.

Standardization is the process of determining the exact concentration of a solution by reacting it with a solution of known concentration. This is important because it allows for more accurate and precise measurements in experiments and chemical reactions.

For example, if you are trying to make a 0.1 M solution of NaOH, you would weigh out the appropriate amount of NaOH and dissolve it in water.

However, if there are impurities in the NaOH or if there was a measurement error, the actual concentration of the solution may be slightly different from 0.1 M.

By standardizing the solution with a solution of known concentration, you can determine the exact concentration and make any necessary adjustments. In conclusion, the solutions of NaOH and HCl can simply be made with careful weighing of reagents, but they need to be standardized to ensure accurate and precise measurements in experiments and chemical reactions.

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When sufficient pressure is applied to the hexagonal open structure of ice, the hydrogen bonds between water molecules are compressed and begin to break.

This results in the formation of a denser form of ice known as ice II, which has a different crystal structure than the original hexagonal ice. If even more pressure is applied, ice III, ice IV, and so on can form, each with its own distinct crystal structure. Interestingly, at extremely high pressures, ice can even transform into a non-crystalline form called amorphous ice. This transformation from hexagonal ice to denser forms is an example of a phase transition, which is a common phenomenon in many materials. Understanding the behavior of water and ice under different conditions is important for a wide range of applications, including climate modeling, materials science, and cryogenics.

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Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA

Answer:

adenine (A) and thymine (T) pair together and cytosine (C) and guanine (G) pair together in DNA

Answer:

The electronic configuration of ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Explanation:

Lithium metal, Li will lose 1 electron to lithium ion Li+. Chlorine atom, Cl will receive the 1 electron to form the chloride ion Cl- as shown by the following equation below:

Li —> Li+ + e

Cl+ e —> Cl-

Combine both equation

Li + Cl + e —> Li+ + Cl- + e

Cancel out 'e'

Li + Cl —> Li+ Cl-

Thus, we can write the electronic configuration for the reaction as follow:

Before reaction:

Li (3) => 1s2 2s1

Cl (17) => 1s2 2s2 2p6 3s2 3p5

After reaction

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Therefore, the electronic configuration of the ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Critical mass is the amount of a radioactive element required to sustain a chain reaction.

The term used to describe the amount of a radioactive element required to sustain a chain reaction is "critical mass." Critical mass is a term used in nuclear physics that refers to the minimum mass of fissionable material needed to maintain a self-sustaining nuclear chain reaction. A chain reaction occurs when a neutron hits a nucleus, which then splits and releases more neutrons, leading to a cascade of nuclear reactions. Critical mass is determined by various factors such as the physical and chemical properties of the fissile material, its shape, temperature, and density. If too little of a fissile material is present, the neutrons will escape, and the reaction will stop.

If too much material is present, the reaction will become uncontrollable and lead to a nuclear explosion. Critical mass refers to the smallest amount of fissile material required to maintain a chain reaction. In order for a chain reaction to occur, a certain number of neutrons must be present. This number of neutrons is known as the neutron population, and it must be maintained at a certain level to keep the reaction going. This is accomplished by carefully controlling the amount of fissile material that is present. If there is too little fissile material, the neutron population will quickly drop below the critical level, and the reaction will stop.

If there is too much fissile material, the neutron population will grow uncontrollably, leading to a nuclear explosion. In order to maintain a chain reaction, the fissile material must be in a critical state, meaning that the neutron population remains constant over time. This is achieved by controlling the geometry of the fissile material, as well as its temperature and density. If any of these parameters change, the critical state will be lost, and the reaction will either stop or become uncontrolled. Therefore, critical mass is a crucial concept in the design and operation of nuclear reactors and weapons.

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The main active ingredient or reducing agent in alkaline perms is Glycerol monothioglycolate (GMT).

alkaline perms are a type of hair treatment used to permanently change the structure of the hair. The main active ingredient or reducing agent in alkaline perms is Glycerol monothioglycolate (GMT). GMT is a chemical compound that helps break the disulfide bonds in the hair, allowing it to be reshaped and set into a new form.

GMT is commonly used in alkaline perms due to its ability to effectively reduce the disulfide bonds at a higher pH level. Alkaline perms typically have a pH level between 9 and 10, which helps to open up the hair cuticles and allow the GMT to penetrate the hair shaft.

Once the disulfide bonds are broken, the hair can be reshaped and then neutralized to reform the bonds in the new desired shape.

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The main active ingredient or reducing agent in alkaline perms is actually thioglycolic acid or its derivative, ammonium thioglycolate.

It is essential to the perm process, by dissolving the disulfide bonds in the hair. The strength and natural structure of the hair is provided by these connections. Thioglycolic acid acts as a reducing agent when applied to the hair, causing disulfide bonds to be broken and the hair to be rebuilt and reshaped.

Permanent waves or curls can be created using this process. To prevent damage to the hair or scalp, it is important to handle these chemicals carefully and according to the correct safety precautions.

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Your question is incomplete, most probably the complete question is:

The main active ingredient or reducing agent in alkaline perms is ______________

5.97 moles of CO₂ would be produced from 88g of Propane (C₃H₈).

The balanced chemical equation for the combustion of propane (C₃H₈) is:

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

The molar mass of propane (C3H8) is:

3(12.01 g/mol) + 8(1.01 g/mol) = 44.1 g/mol

To find the number of moles of propane (C₃H₈), we divide the given mass by the molar mass:

88 g / 44.1 g/mol = 1.99 mol

According to the balanced chemical equation, for every 1 mole of propane (C₃H₈) combusted, 3 moles of carbon dioxide (CO₂) are produced.

Therefore, the number of moles of carbon dioxide (CO₂) produced from 88 g of propane (C₃H₈) is:

1.99 mol C₃H₈ × 3 mol CO₂ / 1 mol C₃H₈ = 5.97 mol CO₂

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Ethanol is produced when ethane and ethene react with water and a catalyst like sulfuric acid. Adding concentrated sulfuric acid to hot ethanol (acts as a catalyst).

To eliminate carbon dioxide and sulphur dioxide that are created as byproducts, the gases are passed through a sodium hydroxide solution. The main product that is gathered over water is ethene. As a result, dehydration of ethanol produces ethene rather than ethane. The names Mattling acid and Oil of Vitriol are other names for sulfuric acid. It is highly caustic and acidic in nature. It dehydrates and oxidises when  present in higher amounts. It is a clear, syrup-like liquid with no colour or smell. A substance having the chemical formula C 2H 6, ethane is an organic chemical.

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