The pH of a 0.74 M solution of alloxanic acid (HC4H3N2O5) is measured to be 3.39.
Calculate the acid dissociation constant Ka of alloxanic acid.
Be sure your answer has the correct number of significant digits.

In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

know more about valence electrons here:

https://brainly.com/question/371590

#SPJ8

Answer:

Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.

Explanation:

Answer:

The correct answer is Choice D.

(Headaches or backaches)​

Explanation:

Hope this helps!

Please mark me as Brainlinieast.

Answer:

This is because Corn is grown on land and has important values to man .These values include as a source of food for man and animals. It is also used as raw materials for the production of certain goods such as flour etc.

It is an energy resource because fermentation of corn gives rise to ethanol fuel which is used as a source of power to run machines and other equipment.

For a simple two-step reaction, assuming k2 is rate limiting, kcat would be equal to the rate constant for the second step of the reaction.

This is because kcat represents the turnover number, or the number of substrate molecules converted to product per enzyme active site per unit time. Since k2 is the rate limiting step, it determines the overall rate of the reaction and thus the rate at which the enzyme can turnover substrate molecules. Therefore, kcat would be equal to k2 in this scenario.

For a simple two-step reaction where k2 is the rate-limiting step, the overall catalytic rate constant (kcat) is equal to k2. This is because the rate-limiting step determines the overall rate of the reaction, and in this case, it's the second step (k2) that is the slowest and thus limiting the overall reaction speed.

Visit here to learn more about enzyme brainly.com/question/31385011
#SPJ11

Answer:

.

Explanation:

The force of gravity acting on the box is 1,500 N or 152.7 kg.

Force of gravity is the force that attracts two objects towards each other. The force of gravity acting on an object is directly proportional to its mass and inversely proportional to the square of the distance between the object and the center of the Earth.

The force of gravity can be calculated using the formula

Fg = mg,

where Fg is the force of gravity, m is the mass of the object, and g is the acceleration due to gravity,

which is approximately 9.81 m/s2 near the surface of the Earth.

If the box weighs 1,500 N, then the force of gravity acting on the box would be

Fg = mg

    = (1,500 N)/(9.81 m/s2)

    = 152.7 kg.

Therefore, the force of gravity acting on the box is 1,500 N or 152.7 kg.

The force of gravity is an important concept in physics, as it affects everything on Earth. The gravitational force between two objects depends on their masses and the distance between them. The more massive the objects are, the greater the force of gravity between them. Similarly, the closer two objects are, the greater the force of gravity between them.

The force of gravity is also responsible for keeping the planets in orbit around the Sun and the Moon in orbit around the Earth. It is a fundamental force of nature that plays a crucial role in our understanding of the universe.

Learn more about force of gravity from the given link

https://brainly.com/question/2537310

#SPJ11

Answer:

wrong.

Explanation: charged atoms have have more electrons than neural because  they charge it . a  neural atom has eaqual number of electrons and neutrons.

hope this helps(^人^)

When an acid dissolves in water, the solute present in the solution is \(H^{+}\) ions as they are released by the acid molecules. This is a characteristic of all acidic solutions.

When an acid dissolves in water, the acid molecules ionize to release \(H^{+}\) ions (also known as hydronium ions, \(H_{3}O^{+}\)).  The H+ ions are the solute present in the solution of an acid dissolved in water. . Some examples of acidic solutions are hydrochloric acid (HCl), sulfuric acid (\(H_{2}SO_{4}\)), and nitric acid (\(HNO_{3}\)).

The concentration of \(H^{+}\) ions in an acidic solution determines the acidity of the solution. Acids have a pH less than 7. The more the concentration of \(H^{+}\) ions, the stronger the acid is, and the lower the pH of the solution. The concentration of \(H^{+}\) ions in a solution can be measured using a pH meter or pH paper.

To know more about acidic solutions:

https://brainly.com/question/29437746

#SPJ11

The Electron Pair Geometry and molecular geometry of a molecule is determined by the electron group by counting the total number of electron pairs around a central atom.

Electron Pair Geometry defined as the the spatial arrangement of a molecule's bonds and lone pairs. It is determined by the number of electron groups. Molecular geometry can be explained as the geometry which depends on not only on the number of electron groups but also on the number of lone pairs. When the electron groups are all bond pairs, they are named exactly like the electron pair geometry. The electron pairs are the bonded electrons, lone pairs and single unpaired electrons. It the total number of electron pairs is estimated the electron pair geometry of the molecule can be drawn.

To learn more about Electron Pair Geometry

https://brainly.com/question/1458198

#SPJ4

Answer:

2.1 mole of NH3. Let us calculate number of hydrogen atoms in (i) 2 moles of HCl and (ii) 1 mole of NH3. So by comparison, we find that 1 mole of NH3 contains more number of hydrogen atoms than 2 moles of HCl

Explanation:

make me brainliest

(a) The potential of hydrogen (pH) before any KOH has been added is 0.872. (b) The pH after 0.0180 L KOH has been added is 1.326. (c) The pH after 0.0360 L KOH has been added is 1.610. (d) The pH after 0.0540 L KOH has been added is 7.0.

(a) Before any KOH has been added, the pH of the hydroiodic acid solution can be calculated using the equation pH = -log[H+], where [H+] is the hydrogen ion concentration.

Since HI is a strong acid, it will dissociate completely in water to form H+ and I-. Therefore, [H+] = 0.134 M, and the pH is calculated as pH = -log(0.134) = 0.872.

(b) After 0.0180 L KOH has been added, the reaction between the acid and the base will produce water and potassium iodide (KI). The number of moles of KOH added can be calculated as follows:

moles of KOH = molarity of KOH x volume of KOH

moles of KOH = 0.268 M x 0.0180 L

moles of KOH = 0.004824

Since KOH is a strong base, it will dissociate completely in water to form K+ and OH-. The number of moles of OH- added is the same as the number of moles of KOH, which is 0.004824 moles.

The number of moles of H+ that react with the OH- can be calculated from the balanced equation:

HI + KOH → KI + H2O

1 mole of HI reacts with 1 mole of KOH to form 1 mole of water. Therefore, the number of moles of H+ that react with the OH- is also 0.004824 moles.

The new concentration of H+ can be calculated from the number of moles of H+ and the new volume of the solution:

moles of H+ = moles of HI - moles of OH-

moles of H+ = 0.134 M x 0.0720 L - 0.004824 moles

moles of H+ = 0.008688

new volume = 0.0720 L + 0.0180 L = 0.0900 L

[H+] = moles of H+ / new volume

[H+] = 0.008688 / 0.0900

[H+] = 0.09653 M

The pH can be calculated as pH = -log(0.09653) = 1.326.

(c) After 0.0360 L KOH has been added, the calculation is similar to part (b), but with a different volume of KOH added. The number of moles of KOH added is:

moles of KOH = 0.268 M x 0.0360 L

moles of KOH = 0.009648

The number of moles of OH- and H+ that react with each other are still the same as in part (b), which is 0.004824 moles.

The new volume of the solution is:

new volume = 0.0720 L + 0.0360 L = 0.1080 L

[H+] = moles of H+ / new volume

[H+] = 0.008688 / 0.1080

[H+] = 0.08044 M

The pH can be calculated as pH = -log(0.08044) = 1.610.

(d) After 0.0540 L of KOH has been added:

At this point, a total of 0.0540 L of KOH has been added to the solution, which is equal to 0.268 M x 0.0540 L = 0.0145 moles of KOH.

To determine the concentration of H+ ions remaining in the solution, we need to subtract the moles of KOH added from the initial moles of H+ ions in the solution.

Initial moles of H+ ions = 0.134 M x 0.0720 L = 0.00967 moles

Moles of H+ ions remaining = 0.00967 - 0.0145 = -0.00483

Since the moles of H+ ions remaining are negative, it means that all the H+ ions have been neutralized by the added KOH.

The solution is now a solution of KI (potassium iodide). Since KI is a salt of a strong acid (HI) and a strong base (KOH), it will not undergo hydrolysis, and its solution will be neutral.

Therefore, the pH at this point is 7.0.

To know more about potential of hydrogen (pH), refer here:
https://brainly.com/question/31383693#
#SPJ11

Answer:Solve for X+ 2x=

Explanation:

Answer:

33

Explanation:

Answer:

B, C, D, F, I

Explanation:

A covalent bond is a chemical bond between two nonmetals (their electronegativity difference must be greater than 1.5-1.6)

.

A. Ca is a metal and O is nonmetal, so the bond in CaO is ionic

B. Both H and Cl are nonmetals, so the bond in HCl is covalent

C. Both C and O are nonmetals, so the bond in CO2 is covalent

D. Both S and O are nonmetals, so the bond in SO2 is covalent

E. Na is a metal and O is nonmetal, so the bond in Na2O is ionic

F. Both P and Cl are nonmetals, so the bond in PCl3 is covalent

G. Mg is a metal and O is nonmetal, so the bond in MgO is ionic

H. Na is a metal and H is nonmetal, so the bond in NaH is ionic

I. Both C and H are nonmetals, so the bond in CH2 is covalent

Traditional medicine has been practiced for thousands of years and has evolved throughout the world.

According to source A, the milestones of traditional medicine in the 1990s include the following:

Learn more about traditional medicine at:

https://brainly.com/question/30825183

#SPJ11

Potassium citrate is the cigarette additive that is used to make sidestream smoke less irritating. It is added to cigarette filters to neutralize the acidity of tobacco smoke and reduce its harshness.

Sidestream smoke is the smoke that is released from a burning cigarette and is inhaled by individuals in the surrounding area. It contains higher levels of harmful chemicals compared to mainstream smoke, which is the smoke that is directly inhaled by the smoker.

By using potassium citrate, the amount of harmful chemicals released into the air is reduced, making sidestream smoke less irritating and harmful to those who inhale it. However, it is important to note that cigarette smoke still contains numerous harmful chemicals, and the best way to reduce the harm from smoking is to quit altogether.

More on Potassium citrate: https://brainly.com/question/28267865

#SPJ11

The phase and temperature changes that will occur if you heat 50.0 g of H2O in its solid state at -8 C until it all vaporizes is that the solid H2O will transition to a liquid state at 0 C and then to a vapor at 100 C.

Vapor is an aerosolized suspension of tiny liquid particles that are released into the air. It is made up of a mixture of water and other chemicals, such as nicotine, propylene glycol, and other flavorings. Vapor is produced when heated liquid, such as e-liquid, is turned into a vapor. This vapor can be inhaled and exhaled in a manner similar to smoking a traditional cigarette, which is why vapor has become an alternative to traditional smoking.

To learn more about vapor
https://brainly.com/question/422363
#SPJ4

Answer: A! The soup will become saltier because evaporation removes the water and leaves the salt behind.

Explanation:

Just finished the test and got a 90%! <3

Answer:

A

Explanation:

Answer:

fire burning wood, fire is a chemical and it creates charred wood

To accurately classify the changes in the PhET simulation's effect on the wavelength, a description of the available changes and their respective bins is necessary In general, changes that can affect the wavelength in a wave simulation include adjusting the frequency, amplitude, speed, or medium properties.

Each of these changes can have a specific effect on the wavelength of the wave. For example, increasing the frequency generally results in a shorter wavelength, while decreasing the frequency leads to a longer wavelength. Similarly, altering the amplitude may not directly affect the wavelength but can impact the intensity or energy of the wave.

Learn more about PhET simulation's effect  here: brainly.com/question/15696175

#SPJ11

Answer:

D

Explanation:

tissues are used to make organs and depending on the organ certain types of tissue can be used

folic Acid

Folic acid, often known as folate, is a water-soluble B vitamin that is necessary for the generation of healthy red blood cells and the regular functioning of the brain system. Folate is present in numerous foods, including leafy green vegetables, legumes, nuts, and grains. Numerous processed goods, including breakfast cereals, breads, and rice, contain it as well. Folic acid is essential for pregnant women because it prevents birth abnormalities. It is also crucial for people of all ages since it helps maintain the health and normal operation of the body's cells. Folic acid is also essential for the production and repair of DNA, as well as the breakdown of specific proteins. Without appropriate folic acid, the body cannot produce red blood cells effectively, which can result in anemia. It is essential to consume adequate amounts of folic acid through diet or supplementation.

Please read more on

brainly.com/question/29704143

#SPJ4

In a vinegar solution with a pH of 2.60 at 25°C, the concentration of hydronium ions ([H3O+]) is 2.51 x 10^(-3) M, while the concentration of hydroxide ions ([OH-]) is 1.0 x 10^(-11) M.

The pH value indicates the acidity of the solution, and the concentrations of [H3O+] and [OH-] can be determined using the relationship between pH and [H3O+]. The pH value of a solution provides information about its acidity or basicity. In this case, the vinegar solution has a pH of 2.60. To determine the concentrations of [H3O+] and [OH-], we use the relationship:

pH = -log[H3O+]

Rearranging the equation, we find:

[H3O+] = 10^(-pH)

Substituting the given pH of 2.60 into the equation, we obtain:

[H3O+] = 10^(-2.60) = 2.51 x 10^(-3) M

Since the solution is acidic, the concentration of [OH-] can be calculated using the equation:

[OH-] = 1.0 x 10^(-14) / [H3O+]

Substituting the value of [H3O+] we found earlier, we get:

[OH-] = 1.0 x 10^(-14) / 2.51 x 10^(-3) ≈ 1.0 x 10^(-11) M

Therefore, in the vinegar solution with a pH of 2.60 at 25°C, the concentrations of [H3O+] and [OH-] are approximately 2.51 x 10^(-3) M and 1.0 x 10^(-11) M, respectively.

To learn more about [H3O+] and [OH-] visit: brainly.com/question/31827522

#SPJ11

Answer:

Explanation:

1 ) Under the proper conditions, water will break apart into hydrogen and oxygen gas.

When water is converted into hydrogen and oxygen , this change is irreversible under ordinary condition . It can not be possible by easy means to obtain water again from hydrogen and oxygen . Hence this is chemical change .

2 )

Water will dissolve sodium chloride, or table salt.

When sodium chloride or table salt is dissolved in water , we can easily get back salt by boiling the water off . The residue will be salt . Hence is is reversible change . Hence this represents physical change.

3 )

Formation of bead on waxy surface is not something in which any change is taking place . Bead too is a water . So it is a physical change .

4 )

When ice melts to form water , it is physical change because , we can get back ice from water easily by  putting water in freeze. Hence it is a physical change.