Select the more electronegative element in each pair.a.Cl or Fb.Se or Oc.N or Asd.Na or Mg

Final answer:

To correct a high Rf value of 0.95 in TLC, decrease the polarity of the mobile phase by using a less polar solvent and ensure the sample is not too concentrated for improved separation and accurate Rf values.

Explanation:

When running Thin Layer Chromatography (TLC), a high Rf value of 0.95 implies that the sample has moved almost as far as the solvent front, suggesting that the mobile phase is too polar. To correct this and achieve better separation, the polarity of the mobile phase should be decreased.

Using a less polar solvent, such as a mixture of hexanes and ethyl acetate, instead of pure acetone might provide better separation of the components 1-octene and 1, 4-dimethylbenzene.

Additionally, ensuring that the samples are not too concentrated can lead to more accurate Rf values and better spot definition. A correctly run TLC should show the desired component with an Rf around 0.35, separated from other spots by at least 0.2 Rf units.

Answer:

A and E

Alpha decay emits the same number of protons and neutrons

Gamma rays are a form of electromagnetic radiation

Explanation:

Just did this one e2020 :)

Answer:

a and e

Explanation:

edge

Answer:

[tex]Br_{4}F_{10}[/tex]

The prefix "Tetra" implies 4 Bromine atoms. The prefix "Deca" implies 10 fluorine atoms.

Answer:

The answer to your question is 20 liters

Explanation:

Data

Pressure 1 = P1 = 2 atm

Volume 1 = V1 = 10 l

Pressure 2 = P2 = 1 atm

Volume 2 = V2 = ?

Process

To solve this problem use Boyle's law

              P1V1 = P2V2

-Solve for V2

              V2 = P1V1/P2

-Substitution

              V2 = (2 x 10)/1

-Simplification

              V2 = 20/1

-Result

               V2 = 20 l

Answer:

P = 746.2 mmHg or 0.9818 atm

Explanation:

First, we have a sample gas (This can be hydrogen, argon, nitrogen or any other gas) that was collected with a pressure of 778 mmHg. We also know the vapor pressure which is 31.8 mmHg. To get the pressure that the gas is exerting, we can assume that the atmospherical pressure is the total pressure of the whole system. Therefore we can use the following expression:

Pt = Pw + Pg   (1)

Where:

Pt: total pressure

Pw: water pressure

Pg: gas pressure

From (1) we can solve for the gas pressure and have:

Pg = Pt - Pw

Replacing the data we have:

Pg = 778 - 31.8

If you want this value in atm, you should divide it by 760 mmHg (Conversion from mmHg to atm):

Pg = 746.2 / 760

Answer:

0.066 mole SO₂

Explanation:

moles = mass in grams / formula weight

= 4.2g/64g/mol = 0.066 mole SO₂

Answer:

The correct option is;

4. becomes rounder

Explanation:

The ciliary muscles in the eye controls the shape of the lens when looking at objects located at different positions. A close by object such as a book that appears large and the eye has to capture the light from wide angles and therefore the lens is made more rounded to enable the light rays to be focused for viewing.

Similarly when looking at far objects, the lens changes to become more planar.

Accommodation is the term used to describe the ability of the eye lens to change its focus and shape.

Final answer:

The total ionic equation for the neutralization reaction of ammonium hydroxide with hydrochloric acid expresses all components as ions and after removing spectator ions, the net ionic equation is OH⁻(aq) + H⁺(aq) → H₂O(l).

Explanation:

To write the total ionic equation for the neutralization reaction of ammonium hydroxide (NH₄OH) with hydrochloric acid (HCl), we need to express all soluble substances as ions. Ammonium hydroxide can be represented as NH₄⁺(aq) and OH⁻(aq) since it partially dissociates in solution. The hydrochloric acid fully dissociates into H⁺(aq) and Cl⁻(aq).

The total ionic equation is as follows:

NH₄⁺(aq) + OH⁻(aq) + H⁺(aq) + Cl⁻(aq) → NH₄⁺(aq) + Cl⁻(aq) + 2H₂O(l)

The net ionic equation, which shows the actual chemical change, is produced by removing the spectator ions (NH₄⁺ and Cl-), resulting in: OH⁻(aq) + H⁺(aq) → H₂O(l)

Final answer:

The total ionic equation for the neutralization reaction between ammonium hydroxide and hydrochloric acid is NH4+(aq) + OH-(aq) + H+(aq) + Cl-(aq) → NH4+(aq) + Cl-(aq) + H2O(l), with H+(aq) + OH-(aq) → H2O(l) as the net ionic equation.

Explanation:

The total ionic equation for the neutralization reaction of ammonium hydroxide (NH4OH) with hydrochloric acid (HCl) shows each species in its ionic form. The reactants ammonium hydroxide and hydrochloric acid dissociate in water to form NH4+ (aq), OH- (aq), H+ (aq), and Cl- (aq). In a complete ionic equation, all of the ions are shown as they exist in solution before and after the reaction:

NH4+ (aq) + OH- (aq) + H+ (aq) + Cl- (aq) → NH4+ (aq) + Cl- (aq) + H2O(l)

After the reaction, ammonium ions and chloride ions remain in solution while water is formed as the product. However, since ammonium ions (NH4+) are spectator ions in this reaction, they can be omitted to provide the net ionic equation:

H+ (aq) + OH- (aq) → H2O(l)

The net ionic equation indicates that the hydrogen ions (H+ from the hydrochloric acid) combine with the hydroxide ions (OH- from the ammonium hydroxide) to form water, which is a characteristic outcome of a neutralization reaction.

Answer:

Mole fraction of [tex]NH_{3}[/tex] in solution is 0.0597.

Explanation:

Molar mass of [tex]NH_{3}[/tex] = 17.031 g/mol

Molar mass of [tex]H_{2}O[/tex] = 18.015 g/mol

No. of moles = (mass)/(molar mass)

So, 15.0 g of [tex]NH_{3}[/tex] = [tex]\frac{15.0}{17.031}[/tex] moles of [tex]NH_{3}[/tex] = 0.8807 moles of [tex]NH_{3}[/tex]

      250 g of [tex]H_{2}O[/tex] = [tex]\frac{250}{18.015}[/tex] moles of [tex]H_{2}O[/tex] = 13.88 moles of [tex]H_{2}O[/tex]

So, Mole fraction of [tex]NH_{3}[/tex] in the solution = (no.of moles of [tex]NH_{3}[/tex] )/(total no. of moles) = [tex]\frac{0.8807}{0.8807+13.88}[/tex] = 0.0597

Hence, mole fraction of [tex]NH_{3}[/tex] in solution is 0.0597.

Answer:

A. Fe2+

Explanation:

other answer was wrong

[tex]Fe^{2+}[/tex] is the most likely to be reduced. Hence, option A is correct.

Oxidation: The loss of electrons

Reduction: The gain of electrons

Oxidation number: the charge based on the number of electrons assigned to an atom as compared to the neutral atom.

[tex]Fe^{2+}[/tex] oxidize to [tex]Fe^{3+}[/tex] because removing the electron results in a half-filled d subshell.

Hence, option A is correct.

Learn more about the oxidation number here:

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Answer:

The rate of temperature change does not stay constant and decreases over time because the temperature difference decreases over time.

Explanation:

The temperature difference is due to Thermal Equilibrium

Answer:

the fraction of CO reacted is 0.76 or 76.0 %

Explanation:

Step 1: Data given

a new catalyst combines a 2.0 : 1.0 mole ratio mixture of carbon monoxide and oxygen gas

Volume = 2.45 L

Total pressure = 740 torr

Temperature = 552 °C = 825 K

Pressure decreases to 552 torr

Step 2: The balanced equation

2CO(g) + O2 (g) --> 2CO2(g)

Step 3: Calculate the percentage of the CO was converted to CO2

P1/n1 = P2/n2

⇒P1 = the initial pressure = 740 torr

⇒n1 = the initial number of moles = 2.0 moles CO and 1 mol of O2 = 3.0 moles

⇒P2 = the final pressure = 552 torr

⇒n2 = the final number of moles = TO BE DETERMINED

n2 = n1 * P2/P1

n2 =3.0 * 552 torr / 740 torr

n2 = 2.24 moles

Step 4: Calculate total moles of CO

Suppose X = the fraction of CO

final = 2*(x) + 3*(1-x)

2.24 = 2x + 3 - 3x

2.24 = -X + 3

-0.76 = -X

X = 0.76

This means the fraction of CO reacted is 0.76 or 76.0 %

The fraction or the percentage of the carbon monoxide converted to carbon dioxide is 76%.

Given:

Ratio of new catalyst to the mole ratio of carbon dioxide and oxygen  = 2:1

Volume = 2.45 L

Temperature = 825 K

Pressure = 740 torr

The reaction is:

2CO(g) + O₂ (g) [tex]\rightarrow[/tex] 2CO₂

From the reaction, the amount of CO converted into carbon dioxide is:

[tex]\dfrac{\text{P}_1}{\text n _1}&=\dfrac{\text{P}_2}{\text n _2}[/tex]

Where,

P₁ = initial pressure

n₁ = number of moles (initial)

P₂ = final pressure

n₂ = final number of moles

Now, calculating the n₂:

[tex]\text n_2 &= \dfrac{\text n_1 \times \text P_2}{\text P_1}[/tex]

[tex]\text n_2 &= \dfrac{3 \times 552}{740}[/tex]

n₂ = 2.24 moles.

Now, the total moles of carbon monoxide is:

2.24 = 2 x Y + 3 x (1 - Y)

2.24 = 2Y + 3 - 3Y

Y = 0.76

Thus, the number of a fraction of CO is 0.76.

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Bromelain separates the amino acids in the enzymes that cause browning by breaking the peptide bonds. The pH of a solution determines the charge of certain R groups.

Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure consisting of a central carbon which is bonded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids present in natural proteins and each amino acid has the same backbone.

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Answer:Deposition is the dropping of sediment by wind, water, ice, or gravity.

Explanation:

When thermal energy is added to a substance, its temperature increases, which can change its state from solid to liquid

Answer:

Explanation:

Given

mass (m) = 0.5 kg

velocity (v) = 15 m/s

Now

Kinetic energy

= 1/2 *m*v²

= 1/2 * 0.5 * 12²

= 0.5 *0.5 * 144

= 36 joule

hope it will help

Answer:

104 J/K

Explanation:

First, we have to calculate the heat (Q) involved in the vaporization of 1.00 mol of methanol.

Q = n × ΔH°vap

Q = 1.00 mol × 35.21 kJ/mol = 35.2 kJ

Then, we have to convert the boiling point to Kelvin.

K = °C + 273.15

K = 64.6 + 273.15 = 337.8 K

Finally, we calculate the change in the entropy associated with this process.

ΔS = Q/T

ΔS = 35.2 kJ/337.8 K = 0.104 kJ/K = 104 J/K

Answer:

A)They both exhibit hydrogen bonding. However, water has more hydrogens available for hydrogen bonding. Therefore, it requires more heat energy to convert it from a liquid to a gas

Explanation:

USA Test Prep Answer

Answer: nitric acid

Explanation:

The solution with the lowest pH would mean that it is an acid, specifically a strong acid which completely dissociates into ions in aqueous solution. The answer it is nitric acid (HCl) that will have the lowest pH because it is the only strong acid in the group

Answer:

The correct order of increasing standard molar entropy for the noble gases is He ≤ Ne ≤ Ar ≤ Kr

Explanation:

Entropy is the measure of degree of disorderliness or randomness of a substance. Entropy increases with increasing number of electron present in an atom due to increased repulsive force of the electrons. Therefore, the standard entropy of a substance increases with an increase in their atomic masses.

For the given noble gases in this question, Helium (He) has the least atomic mass while Krypton (Kr) has the highest atomic mass.

Thus, the correct order of increasing standard molar entropy for the noble gases is He ≤ Ne ≤ Ar ≤ Kr

Final answer:

The increasing standard molar entropy for noble gases is He ≤ Ne ≤ Ar ≤ Kr, due to growing atomic number and electronic complexity down the group.

Explanation:

The correct order of increasing standard molar entropy for the noble gases is He ≤ Ne ≤ Ar ≤ Kr. This is because entropy generally increases with atomic number due to increased electronic complexity and atomic mass. As you move down the group in the periodic table, noble gases have more electrons that can occupy a greater volume of space and therefore have higher entropy.

Answer:

Somatotropin(Growth Hormone)

Explanation:

-Uncontrolled growth in a person is usually caused by the excessive secretion of growth hormone.

-This hormone is also known as Somatotropin.

-This hormone is produced  in the pituitary  gland.

Answer:

it's a chemical change and an electrolytic reaction

Answer:

Chemical reactions proceed at different rates. The factors that affect reaction rates are:

surface area of a solid reactant

concentration or pressure of a reactant

temperature

nature of the reactants

presence/absence of a catalyst.

A change in one or more of these factors may alter the rate of a reaction. In this lesson, you will define these factors, and describe and predict their effects on reaction rates.

Surface Area

Surface area is the exposed matter of a solid substance.

Imagine that you are holding a perfect cube of magnesium. The surface area is the sum of the area of all six sides of the cube. The surface area of the cube can be increased by dividing the cube into smaller cubes. Surface area is maximized when a single large cube is crushed to fine powder.

The rate of reaction of a solid substance is related to its surface area. In a reaction between a solid and an aqueous/liquid/gas species, increasing the surface area of the solid-phase reactant increases the number of collisions per second and therefore increases the reaction rate.

In a reaction between magnesium metal and hydrochloric acid, magnesium atoms must collide with the hydrogen ions. When the magnesium atoms form one big lump...

The concentration of a gas is a function of the pressure on the gas. Increasing the pressure of a gas is exactly the same as increasing its concentration. If you have a certain number of gas molecules, you can increase the pressure by forcing them into a smaller volume.

Under higher pressure or at a higher concentration, gas molecules collide more frequently and react at a faster rate. Conversely, increasing the volume of a gas decreases pressure which in turn decreases the collision frequency and thus reduces the reaction rate.

It is important to note however that there are reactions involving gases in which a pressure change does not affect the reaction rate. For this reason, the rates of reactions involving gases have to be determined by experiment.

Also note that solids and liquids are not affected by pressure changes.

Need a good analogy for the effect of concentration on the rate of a chemical reaction?

Temperature

With the exception of some precipitation reactions involving ionic compounds in solution, just about all chemical reactions take place at a faster rate at higher temperatures. The question is why?

Temperature (in Kelvin degrees) is proportional to the kinetic energy of the particles in a substance. For example, if the Kelvin temperature of a substance is doubled, then the average kinetic energy of the particles in that substance is doubled.

At higher temperatures, particles collide more frequently and with greater intensity.

Here's an analogy.

Imagine that you are baby-sitting a bunch of 6 year olds. You put them in a yard and you let them run around. Every now and then a couple of kids will run into each other. Now imagine that you decide to feed them some sugar. What happens? They run around faster and of course there are many more collisions. Not only that, the collisions are likely to be a lot harder/more intense.

Now, let's look at the effect graphically. Recall that in any sample of matter (the example we used previously was a gas), individual particles have different kinetic energies. Some are moving fast some are moving slowly, and most are moving at some intermediate speed.

Increasing the temperature by say 10°C causes some of the intermediate speed molecules to move faster. The result is more molecules with sufficient kinetic energy to form an activated complex upon collision!

Now consider the relationship between threshold kinetic energy and activation energy. Threshold kinetic energy is the minimum amount of energy required for colliding particles to react - it is the equivalent of activation energy or the minimum potential energy gain required to form an activated complex.

As you can see on the graph, a small increase in temperature can double the number of molecules with the threshold kinetic energy.

Thus there are two effects of increasing temperature: greater collision intensity and more frequent collisions.

A general rule is that a 10°C temperature increase can double a reaction rate. It turns out that the increase in the reaction rate is mainly a function of the more intense collisions. Increased collision frequency is not as significant a factor.

Explanation:

Answer:

takes place in the glomerulus

Explanation:

which is the vascular beginning of the nephron . Approximately one-fourth of the blood flow from cardiac output circulates through the kidney, the greatest rate of blood flow for any organ .

The filtration of the blood in the kidneys occurs in the glomerulus, where most solutes are filtered out by glomerular filtration.    

Filtration of the Blood in the Kidneys:

The filtration of the blood in the kidneys primarily occurs in the glomerulus. The glomerulus is a network of capillaries at the beginning of a nephron. When blood flows through the glomerulus, most solutes, except for proteins, are filtered out into the glomerulus by a process called glomerular filtration. The filtrate is then collected in the renal tubules, where it undergoes further processing to form urine.

This process begins with glomerular filtration, continues with tubular reabsorption in the proximal convoluted tubule (PCT), and ends with tubular secretion. Finally, the collecting ducts gather the filtrate, now called urine, which is passed on to the ureters and then eliminated from the body.

Answer:

Dissolve: to terminate a union of multiple members actively, as by disbanding

Answer:

THE ANSWER IS (D)

Explanation:

Answer:

it's D

Explanation:

Addition of base into the water increase hydronium ion concentration of the solution is a false statement other 4 are correct.

Explanation:

Answer: 1, 2 and 5

Explanation:

did usatestprep

Answer:

The answer to your question is V2 = 0.34 l

Explanation:

Data

Pressure 1 = P1 = 155 kPa

Temperature 1 = T1 = 25°C = 298°K

Volume 1 = V1 = 1 l

Pressure 2 = P2 = 605 kPa

Temperature 2 = T2 = 125°C = 398°K

Volume 2 = V2 = ?

Process

To solve this problem use the Combined gas law.

           P1V1/T1 = P2V2/T2

-Solve for V2

          V2 = P1V1T2 / T1P2

-Substitution

          V2 = (155)(1)(398) / (298)(605)

-Simplification

          V2 = 61690 / 180290

-Result

          V2 = 0.34 l