Which element on the periodic table in the 8th column has the largest radius

Answer:

hello your question is incomplete and lacks the required figure  below is the missing part

The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytosine bonds with guanine shows the thymine adenine bond. Each charge shown is ±e, and the H−N distance is 0.110 nm

answer : net force due to O-H-N combination = -5.03354 * 10^-9 N

              net force due to N-H-N combination = -3.822 * 10^-9 N

              net force that the thymine exerts on adenine =  -8.8558 * 10^-9 N

Explanation:

considering only the forces due to O-H-N and N-H-N to determine the net force been exerted on adenine by thymine

we have to make some assumptions

we have to assume force towards thymine to be negative

Net force that thymine exerts on Adenine

= net force due to 0-H-N  + net force due to N-H-N

= ( -5.03354 * 10^-9 ) +  ( - 3.822 * 10 ^-9 )

=  -8.8558 * 10 ^-9 N

ATTACHED BELOW IS THE REMAINING PART OF THE SOLUTION

Answer:

f=ma

Explanation:

Force is measured in newtons btw

Answer:

Aspirin = acetylsalicyclic acid

Its conjugate base = acetylsalicyclate

Note: See the attachment below for structures.

Explanation:

Aspirin, also known as acetylsalicyclic acid is derived from the acetylation of salicyclic acid at carbon-2. It is used as a medication in the treatment of pain, fever and inflammation.

It is grouped under the class of non-steroidal anti-inflammatory drugs (NSAIDs), which are a class of drugs that in addition to anti-inflammatory actions,  have analgesic, antipyretic, and platelet-inhibitory actions.

Its conjugate base, acetylsalicyclate is obtained from the deprotonation of the carboxylic acid group, -COOH.

Answer:

true

Explanation:

Answer: physical please let me know if its wrong !

Answer:

it is B

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Which one of the following combinations cannot function as a buffer solution?

A) HCN and KCN

B) NH3 and (NH4)2SO4

C) HNO3 and NaNO3

D) HF and NAF

E) HNO2 and NaNO2

Answer:

The metal element → Magnesium (Mg)

Answer:

magnesium

Explanation:

magnesium has electrons arranged 2,8,2

Answer:

38 g as well due to the law of conservation of mass.

Explanation:

Hello,

In this case, we need to review the law of conservation of mass which states that matter cannot be neither created nor destroyed, thus, for chemical reactions, the mass of reactants at the beginning of the chemical reaction must equal the mass of products at the end in closed systems, that is why, since 38 g is the mass of reactants, the mass of the overall products is also 38 g.

Best regards.

Answer:

0.486atm is the pressure of the cylinder

Explanation:

1 mole of Pb(NO₃)₂ descomposes in 4 moles of NO2 and 1 mole of O2. That is 1 mole descomposes in 5 moles of gas.

To find the pressure of the cylinder, we need to find moles of gas produced, and using general gas law we can determine the pressure of the gas:

Moles Pb(NO₃)₂ and moles of gas:

3.31g * (1mol / 331g) = 0.01 moles of Pb(NO₃)₂.

That means moles of gas produced is 0.05 moles.

Pressure of the gas:

Using PV = nRT

P = nRT/V

Where P is pressure (Incognite)

V is volume (2.53L)

R is gas constant (0.082atmL/molK)

T is absolute temperature (300K)

And n are moles of gas (0.05 moles)

P = 0.05mol*0.082atmL/molK*300K / 2.53L

P = 0.486atm is the pressure of the cylinder

Answer:

The windsurfer, his board, and the air and water around him are all made of matter. That matter is made up of very small particles called atoms.

Explanation:

The windsurfer, the board, and the surroundings are all components involved in the activity of windsurfing. Let's compare them:

1. Windsurfer: The windsurfer is the person engaging in the sport. They are responsible for controlling the board and maneuvering through the water using the sail. The windsurfer's skills, balance, and physical abilities play a crucial role in their performance.

2. Board: The windsurfing board is the equipment used by the windsurfer. It typically consists of a long, narrow board with a fin at the bottom for stability and control. The board is designed to float on the water and provide a platform for the windsurfer to stand on.

3. Surroundings: The surroundings refer to the environment in which windsurfing takes place, which is usually a body of water such as a lake, river, or ocean. The condition of the water, including its temperature, depth, and currents, can affect the windsurfer's experience and performance.

In summary, the windsurfer, the board, and the surroundings are interconnected components of the windsurfing experience.

The skills and physical abilities of the windsurfer, the design and performance of the board, and the characteristics of the surrounding environment all contribute to the overall enjoyment and success of the activity.

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Answer:

It forms a solution.

Explanation:

A pure substance is when only one type of atom or molecule is present. In this case the substance contains two different molecules; sugar and water, assuming sugar is all one type (e.g. glucose) and there are no contaminants in the water or sugar before combining the two.

Dissolving the sugar in the water makes a homogeneous mixture and once dissolved a solution is made by the combination of a solute (sugar) and solvent (water).

Hope this helps!!!!

Answer:

(C) is the belief that knowledge is not certain.

Explanation: I would say it’s (C) because Most scientist or empirical skeptic is one who questions beliefs on the basis of scientific understanding and empirical evidence. Scientific skepticism may discard beliefs pertaining to purported phenomena not subject to reliable observation and thus not systematic or testable empirically.

Answer:

(C) is the belief that knowledge is not certain.

Explanation:

Answer:

The strong forces of attraction between the particles stop the particles from moving around each other and making the solid flow. The particles are close together so they need to be compressed hard to get them closer.

Explanation:

In solids, strong forces of attraction holds the particles together in a three-dimensional structure. The particles form an orderly arrangements called Lattice.

Fructose monosaccharides is not an aldose sugar. Hence option B is correct.

Monosaccharide is a simplest form of sugar that is not decompose in simple sugars by hydrolysis and it contains one or more hydroxyl groups.

Types of sugars – Aldose and ketose (which are named on the basis of presence of functional groups aldehyde and ketone).

Aldose is a monosaccharide contains carbon chain with carbonyl group in endmost carbon atom.

Erythrose, glucose, glyceraldehyde and ribose contain aldehyde as a functional group so these are example of aldose where as fructose contains a ketone group so it is a ketose not an aldose.

Fructose monosaccharides is not an aldose sugar. Hence option B is correct.

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Answer:

Explanation:

Since [tex]CH _ 3COOH[/tex] is a weak acid to find the pH of [tex]CH _ 3COOH[/tex] we use the formula

[tex]pH = - \frac{1}{2} log(Ka) - \frac{1}{2} log(c) [/tex]

where

Ka is the acid dissociation constant

c is the concentration

From the question

Ka of [tex]CH _ 3COOH[/tex] = 1.75 × 10^-5

c = 1.00 × 10-³M

Substitute the values into the above formula and solve for the pH

That's

[tex]pH = \frac{1}{2} ( - log(1.75 \times {10 }^{ - 5} - log(1.00 \times {10}^{ - 3} ) ) \\ = \frac{1}{2} (4.757 + 3) \\ = \frac{1}{2} \times 7.757) \\ = 3.8785 \: \: \: \: \: \: \: \: [/tex]

We have the answer as

To find the pOH we use the formula

pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 3.9

We have the answer as

Hope this helps you

Answer:

Conjugate acid- H2SeO4

Conjugate base- H2O

Explanation:

The full equation of the reaction is; H2SeO4(aq) + H2O(aq)-->H3O^+( aq) + HSeO4^-(aq).

The conjugate acid is the specie that donates a proton to the conjugate base, hence H2SeO4 is the conjugate acid while H2O is the conjugate base because it accepts a proton from H2SeO4, hence the answer above.

Answer:

[tex]h=100.8cm[/tex]

Explanation:

Hello,

In this case, considering the density and mass of both water and heptane we first compute the volume of each one:

[tex]V_{water}=\frac{m_{water}}{\rho _{water}}=\frac{34g}{1.00g/mL}=34mL\\ \\V_{heptane}=\frac{m_{heptane}}{\rho _{heptane}}=\frac{34.6g}{0.684g/mL}=50.6mL\\[/tex]

Now, the total volume is:

[tex]V=50.6mL+34mL=84.6mL[/tex]

Which is equal to:

[tex]V=84.6cm^3[/tex]

Then, by knowing that the volume of a cylinder is πr²h or π(D/2)²h, we solve for the height as follows:

[tex]h=\frac{V}{\pi (D/2)^2} \\\\h=\frac{84.6cm^3}{\pi (3.16cm/2)^2} \\\\h=100.8cm[/tex]

Best regards.

Answer:

72.3%

Explanation:

The following data were obtained from the question:

Theoretical yield of MgO = 3.43 g

Actual yield of MgO = 2.48g

Percentage yield of MgO =.?

Percentage yield of a reaction can simply be obtained by dividing the actual yield by the theoretical yield multiplied by 100. This is illustrated below:

Percentage yield = Actual yield /Theoretical yield × 100

Thus, we can obtain the percentage yield of MgO as follow:

Theoretical yield of MgO = 3.43 g

Actual yield of MgO = 2.48g

Percentage yield of MgO =.? Percentage yield = Actual yield /Theoretical yield × 100

Percentage yield = 2.48/3.43 × 100

Percentage yield = 72.3%

Therefore, the percentage yield of MgO is 72.3%.

Liquid (Matter can exist in one of three main states: solid, liquid, or gas.)

Answerb

Explanation:because I got it right

Answer:

The person at the top said the right answer I checked

Answer:

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Answer:

After 1326s, the concentration of pyruvic acid fall to 1/64 of its initial concentration.

Explanation:

The first order kinetics reaction is:

ln [A] = ln [A]₀ - kt

Where [A] is concentration after t time, [A]₀ is intial concentration and k is reaction constant.

To convert half-life to k you must use:

t(1/2) = ln 2 / K

221s = ln 2 / K

K = ln 2 / 221s

If [A] = 1/64, [A]₀ = 1:

ln [A] = ln [A]₀ - kt

ln (1/64) = ln 1 - 3.1364x10⁻³t

4.1588 = 3.1364x10⁻³s⁻¹t

1326s = t

The time takes for the concentration of pyruvic acid to fall to 1/64 of its initial value in this first order reaction 1326s.

Time will be calculated by using the first order kinetics equation as:

ln [A] = ln [A]₀ - kt, where

[A] = final concentration = 1/64

[A]₀ = initial concentration = 1

t = required time

k is the rate constant and will be calculated by using the half life duration 221s as:

t(1/2) = ln2 / k

221s = ln2 / k

k = ln2 / 221s = 3.1364x10⁻³ per sec

Now putting all these values on the above equation, we get

ln (1/64) = ln 1 - 3.1364x10⁻³t

4.1588 = 3.1364x10⁻³s⁻¹t

1326s = t

Hence, required time is 1326s.

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Answer:

Relief is typically defined as the difference in height between the high point and the low point on a landscape, in feet or in meters.

Explanation:

Answer:

Relief is the difference in elevation between two points. It is easily calculated by subtracting the lowest elevation from the highest elevation in an area.

Explanation:

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Answer:

a. the sum of all protons and neutrons

Answer:

a

 [tex]V  =   0.124 \ Liters[/tex]

b

[tex]V  =  0.112 \  Liters[/tex]

Explanation:

From the question we are told that

  The pressure of compressed gas is [tex]P  =  200 \  bar = \frac{200}{1.013}=  197.4 \ atm[/tex]

  The  temperature is  [tex]T  =  25^oC =  25 + 273 = 298 \  K [/tex]

Generally the perfect gas equation is mathematically represented as

     [tex]PV =  nRT[/tex]

substituting 0.08206 L-atm/mol-K  for R and  1 mole for n

We have that

     [tex]V  =  \frac{1 *  0.08206 * 298 }{ 197.4}[/tex]

       [tex]V  =   0.124 \ Liters[/tex]

Generally the van der Waals equation is mathematically represented as

       [tex]nRT  =  [P + \frac{n^2 * a }{V^2 } ][V - nb][/tex]

=>[tex]1 *  0.08206 *298  =  [197.4 + \frac{1^2 *  1.364}{V^2 } ][V - 1 * 3.19 * 10^{-2}][/tex]

=>    [tex]V  =  0.112 \  Liters[/tex]