The twisted ladder shape of the dna molecule is called a.

The correct answer is 2.03×1/10² mol

500 cm³ = 0.5 L,760 mm of Hg=1 atm.

Now apply the ideal gas law, n= PV/RT

​n= 1×0.5/ 0.0821×300

⟹n=2.03×10 ^−2 mol

What is the ideal gas law?

To know more about ideal gas law, click the link given below:

https://brainly.com/question/28257995

#SPJ1

C. when the reflux ring passes the top of the condenser.

Reflux procedures involve heating a mixture in a flask, with the vapors that are generated condensing in a condenser and returning to the flask. This process is known as reflux and it helps to ensure that the reaction proceeds smoothly and completely.

The reflux ring is a visible indicator of the rate at which the vapor is condensing in the condenser. It is formed at the point where the hot vapor meets the cooler condenser and it moves up and down depending on the amount of vapor being condensed.

Timing the reflux for the procedure is important because it helps to ensure that the reaction proceeds for the required length of time. The reflux period is typically determined by the nature of the reaction and can range from a few minutes to several hours.


Therefore, the correct option is C - when the reflux ring passes the top of the condenser. This ensures that the reflux is occurring at the required rate and the reaction is proceeding as intended.

The Question was Incomplete, Find the full content below :

content loaded

Many reflux procedures involve a required length of time for the reflux to occur.

When should you start timing the reflux for the procedure?

Select one:

a. When you turn on the heat under the flask

b. When the sample is transferred to the flask

c. When the reflux ring passes the top of the condenser

d. When the reflux ring stabilizes in the condenser

Know more about reflux here:

https://brainly.com/question/30290239

#SPJ11

The half-life of the radioisotope, calculated based on the given information that after ten years only 75 grams remain from an initial 100 grams, is approximately 28.97 years.

To find the half-life of the radioisotope, we can use the formula for exponential decay:

N(t) = N₀ × (1/2)^(t / T₁/₂)

T₁/₂ is the half-life of the substance.

In this case, we know that the initial amount N₀ is 100 grams, and after ten years (t = 10), 75 grams remain (N(t) = 75 grams).

We can plug these values into the equation and solve for T₁/₂:

75 = 100 × (1/2)^(10 / T₁/₂)

Dividing both sides of the equation by 100:

0.75 = (1/2)^(10 / T₁/₂)

Taking the logarithm (base 2) of both sides to isolate the exponent:

log₂(0.75) = (10 / T₁/₂) × log₂(1/2)

Using the property log₂(a^b) = b × log₂(a):

log₂(0.75) = -10 / T₁/₂

Rearranging the equation:

T₁/₂ = -10 / log₂(0.75)

Using a calculator to evaluate the logarithm and perform the division:

T₁/₂ ≈ 29.13 years

Therefore, the half-life of the radioisotope is approximately 28.97 years.

Read more on half-life period here: https://brainly.com/question/12341489

#SPJ11

The rate of second order reaction depends on the change in the concentration of the reactants.

A second order reaction is one in which the rate of reaction depends on the concentration of reactants.

For a second order reaction;

1/[A] = kt + 1/[A]o

When concentration deceresases to one-half;

1/0.1 = 0.54t + 1/0.20

1/0.1 -  1/0.20 = 0.54t

10 - 5/0.54 = t

t = 9.3 s

When concentration deceresases to one-sixteenth;

1/0.0125 = 0.54t + 1/0.20

1/0.0125 -   1/0.20 = 0.54t

80 - 5 =  0.54t

t = 80 - 5/0.54

t = 149 s

When concentration deceresases to one-ninth;

1/0.022 =  0.54t + 1/0.20

1/0.022  -   1/0.20 = 0.54t

45 - 5 =  0.54t

t = 45 - 5/0.54

t = 74 s

Learn more about second order reaction: https://brainly.com/question/12446045

Nothing is destroyed by burning or other modifications to matter. Before and after changes always occur, the mass of the substance remains constant. According to the principle of conservation of mass, matter cannot be created or destroyed.

To learn more about :  Combustion

Ref : https://brainly.com/question/15246277

#SPJ13

Answer:

Explanation:

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

To know more about moles and molecules,

https://brainly.com/question/29367909

Answer:

Explanation:

Stays colourless

A few drops of thymolphthalein indicator will not change an acid's colour

hope it helps

Answer:

The answer is A

Explanation:

Trial and error :P

Answer: The answer is B. Energy and matter can enter and leave.

Explanation:

A building is found to contain a radioactive gas. Thirty hours later, 60% of the initial amount of gas is still present.So, we have to calculate the half-life of the radioactive gas.

(a) Write a model for the percentage of the initial amount of the radioactive gas present after t hours. (Round all numerical values to three decimal places.)

Formula used to find the amount of radioactive gas present after t hours:

So, the remaining amount of radioactive gas is 40%.That is, r(t) = 40% = 0.40r₀and t = 30So, the formula becomes:

(b) Calculate the half-life of the radioactive gas. (Round your answer to three decimal places.)From the formula,r(t) = r₀ (1/2)^(t/T)When t = T, r(t) = 1/2 of r₀r(T) = r₀/2Divide both sides by r₀r(T)/r₀ = 1/2We have r(T)/r₀ = 0.5, and the formula becomes 0.5 = (1/2)^(T/T)0.5 = (1/2)^1T = 1Therefore, the half-life of the radioactive gas is one hour.Answer Half-life of the radioactive gas = 1 hour.

Radioactive is the ability of an unstable atomic nucleus to become stable through emission of radiation. This capability involves the process of splitting unstable atomic nuclei resulting in energy loss by emitting radiation, such as alpha particles, beta particles with neutrinos and gamma rays. What is radioactive impact? It is necessary to know, radioactive substances from nuclear radiation are compounds that are harmful to humans and other living things. The effects of nuclear radiation not only damage human DNA, but can also cause cancer. The effects of nuclear radiation can damage the atoms in the body and damage DNA.

Learn More About Radioactive at https://brainly.com/question/1236735

#SPJ11

I'm pretty sure it's A)

Dream car: 2022 Tesla Model S; Second car: 2022 Toyota Camry

To calculate the amount spent on gas in one year for each car, we need to multiply the number of gallons of gas used in one year by the price per gallon.

For the dream car: 426.9 gallons x $3.00/gallon = $1280.70 spent on gas in one year.

For the second car: 500 gallons x $3.00/gallon = $1500 spent on gas in one year.

Therefore, you would spend $1280.70 on gas for the dream car and $1500 on gas for the second car in one year.

The Tesla Model S is an electric car, so it does not have miles per gallon on the highway.

The Toyota Camry has a highway mpg of 39.

Balanced equation for the combustion of octane: 2C8H18 + 25O2 → 16CO2 + 18H2O

The first car (Tesla Model S) uses no gasoline, so it does not use any gallons of gas in one year.

Converting 1 gallon to mL: 1 gallon = 3785.4 mL

Assuming you drive the Toyota Camry 15,000 miles in one year and get 39 mpg on the highway: 15,000 miles ÷ 39 miles per gallon = 384.6 gallons

Converting gallons to mL: 384.6 gallons x 3785.4 mL/gallon = 1,455,047.64 mL

The second car (Toyota Camry) uses 384.6 gallons of gas in one year.

Converting gallons to mL for the second car: 384.6 gallons x 3785.4 mL/gallon = 1,455,047.64 mL

The Tesla Model S is more efficient in terms of gas use since it uses no gasoline.

Learn more about gallon here:

https://brainly.com/question/9917229

#SPJ1

In the given atomic model, the strong nuclear force occurs inside the nucleus. Option D is correct.

The strong nuclear force is one of the fundamental forces of nature and it acts on particles called quarks, which are the building blocks of protons and neutrons. This force is responsible for holding the nucleus of an atom together.

Inside the nucleus, protons and neutrons are tightly bound to each other by the strong nuclear force. It overcomes the electrostatic repulsion between the positively charged protons, preventing the nucleus from disintegrating. The strong nuclear force is extremely powerful but short-ranged, meaning it acts only at very short distances within the nucleus.

Outside the nucleus, in the electron cloud, other forces such as electromagnetic forces and gravitational forces dominate the interactions. However, within the nucleus, the strong nuclear force is responsible for binding the protons and neutrons together, maintaining the stability of the atomic nucleus.

Hence, D. is the correct option.

To know more about atomic model here

https://brainly.com/question/1100068

#SPJ4

--The given question is incomplete, the complete question is

"In the following atomic model, where does the strong nuclear force happen? A) outside a B) between a and b C) between b and c D) inside c."--

Answer:

96 g/mol.

Explanation:

As a result, as shown below, the molecular weight of sulfate SO4 can be easily calculated.

=(S) + 4(O)\s

= (32) + 4(16)\s

= 32 + 64.\s

= 96.

As a result, the molecular mass of sulfuric acid SO4 is 96 g/mol.

Answer:

Below

Explanation:

Use your Periodic Table of Elements

  sulfur = 32.06 gm  molar mass

  oxygen= 15.999  gm   ( and there is FOUR of these)

       total = 96.056 gm  molar mass for SO4

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

Learn more about stoichiometry at: https://brainly.com/question/9743981

#SPJ1

Answer:

combining iron, carbon and transition metals such as chromium and nickel.

Explanation:

Steels are alloys of iron and carbon. Steel is hard, tough and strong. The amount of carbon present in varies between 0.1 and 1.5% and it determines the hardness of steel. The higher the carbon content, the harder the steel produced. Also, the amount of heat treatment as well as presence of other elements determines the properties of steel produced.

Steel can be combined with other elements such as nickel, chromium, and manganese to produce various other alloys of steel . These alloys have various desirable properties than ordinary steel such as resistance to corrosion, high tensile strength and luster.

Answer:

1) KI

2) Mg3P2

3) Ag2S

4) FeBr3

5) Mg(OH)2

6) Na2SO4

7) Pb(NO3)4

8) (NH4)2CO3

Answer:

The answer is

Explanation:

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

\(volume = \frac{mass}{density} \\\)

From the question

mass = 4500 g

density = 20.5 g/cm³

We have

\(volume = \frac{4500 }{20.5} \\ = 219.51219...\)

We have the final answer as

Hope this helps you

Answer:

a

Explanation:

From the given images, it is clear that both rocks are non-foliated rocks because they don't have distinct repetitive layers.  Hence option a is correct.

Metamorphic rocks are formed through intense pressure and heating from the sedimentary or igneous rocks. Sometime the change n heat or pressure make the metamorphic rocks gets foliated.

Foliation occurs when pressure forces flat or elongate minerals within a rock to align. These rocks form a platy or sheet-like structure that reflects the pressure direction. There is no platy or sheet-like structure in non-foliated metamorphic rocks.

Non-foliated rocks can be created in a variety of ways. Some rocks, like limestone, are composed of minerals that are not flat or elongate. Therefore, the given rocks are non-foliated.

To find more on foliated rocks, refer here:

https://brainly.com/question/1984747

#SPJ2

A strong sharp signal at 1715 cm-1 on an FTIR spectrum indicates the presence of a carbonyl functional group.

An FTIR spectrum provides information about the types of functional groups present in a molecule. A strong, sharp signal at 1715 cm-1 is indicative of the presence of a carbonyl functional group, which is characterized by the C=O bond stretching vibration. A carbonyl functional group is present in compounds such as aldehydes, ketones, carboxylic acids, and esters. The position of the carbonyl group in a molecule can also be determined by analyzing the FTIR spectrum.

For example, in an aldehyde, the carbonyl group will be located at the end of the carbon chain, while in a ketone, the carbonyl group will be located within the carbon chain. Therefore, by analyzing the FTIR spectrum of a sample, the type and location of the carbonyl functional group can be identified, which provides valuable information about the sample's chemical structure and properties.

Learn more about FTIR spectrum here:

https://brainly.com/question/13265557

#SPJ11

It improves as a leaving group when there is alcohol and protonate. The chemicals we utilize for this are phosphorus trihalides (PX3, where X = halide) or thionyl halides in pyridine (SOX2, where X = halide).

The dehydration process of alcohols to produce alkene is carried out by heating the alcohols at high temperatures in the presence of a powerful acid, such as sulfuric or phosphoric acid.

Alcohols are converted into alkyl halides using PBr or SOCl2. The most popular processes for changing 1- and 2-alcohols into their corresponding chloro and bromo alkanes (replacing the hydroxyl group) are treatments with thionyl chloride (SOCl2) and phosphorus tribromide (PBr3), respectively.

To know more about alcohol group visit:-

https://brainly.com/question/696051

#SPJ4

Answer:

Pollution comes from factories, careless humans, chemicals, non-biodegradable trash.

Explanation:

Answer:

I think ammonium nitrate is correct answer

is there any other options please check that question once

The discoveries of Sir J.J Thomson and Sir Rutherford disproves Dalton's atomic theory in the sense that their theories negates, disorient and disproves the theory which he proposed that atoms are indivisible, but rather atoms consist of elementary particles.

When Dalton said " atoms are made up of indestructible and indivisible particles, these scientists proved him otherwise by establishing the fact that the atoms of elements consist of a central core nucleus containing protons and neutrons and electrons revolves around the nucleus

So therefore, we now deduce from the explanation above that atoms consist of elementary subatomic particles which is unlike what John Dalton said in his discoveries.

Read more on atomic theory:

https://brainly.com/question/7622425

#SPJ1

Answer: A chemical formula is a combination of symbols which represents the composition of a compound. Formulas often contain numerals to indicate the proportions in which the elements occur within a compound. For example, we have learned from experiments that water is composed of the elements hydrogen and oxygen.

Explanation:

The required pressure of the gas is 546 mmHg.

Relation between the volume and pressure of gas is explained through the ideal gas equation PV = nRT, and for the question required equation is:

P₁V₁ = P₂V₂, where

P₁ & V₁ are the initial pressure and volume.

P₂ & V₂ are the final pressure and volume.

On putting values from the question to the equation, we get

P₂ = (780)(350) / (500) =

P₂ = 546 mmHg

Hence required pressure is 546 mmHg.

To know more about ideal gas equation, visit the below link:

https://brainly.com/question/24236411

#SPJ1

When equal masses of ch4(g) and o2(g) are placed in a container, exerting a total pressure of 600 torrs, then the partial pressure of ch4(g) will be 300torr

Let, x gm o2 and ch4 are present

Given,

Total Pressure = 600torr

Number of moles of o2 = x/16

Number of moles of Ch4 = x/16

According to the Daltons law of partial pressure,

Pa =Xa*Ptotal

Xa is the mole fraction of a

Xch4 =\(\frac{x/16}{x/16 +x/16}\)

         =1/2 = 0.5

Pch4 = 0.5×600 = 300torr

Therefore the partial pressure of ch4 will be 300 torr when a total pressure of 600 torr is applied to the mixture.

Learn more about partial pressure:

https://brainly.com/question/28116497

#SPJ4

The concentration, in m/v percent, of a solution prepared from 50. g nacl and 2.5 l of water is 2 %.

The mass/volume percent is the ratio of a solution's total volume to the mass of the solute that makes up that solution. Since this type of concentration has been expressed as a percentage, the given proportion should be multiplied by 100.

The calculation if concentration is shown as:

It can be calculate as follows:

% NaCl = Mass of NaCl / Total mass × 100 %

% NaCl = 50 gram / 2500 × 100 %

%  NaCl = 2 %.

As a result, the solution made from 50 g of nacl and 2.5 l of water will have a 2% concentration.

To know more about concentration

brainly.com/question/10695134

#SPJ4

Answer:

???

Explanation:

Answer:

\(\boxed{\boxed {\sf 23.0 \ g \ Ba(NO_3)_2}}\)

Explanation:

We are asked to find the mass of 5.30 ×10²² formula units of barium nitrate.

First, we convert formula units to moles using Avogadro's Number or 6.022×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are formula units of barium nitrate.

Set up a conversion factor using Avogadro's Number.

\(\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

We are converting 5.30×10²² formula units, so we multiply by this value.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

Flip the conversion factor so the units of formula units of barium nitrate cancel.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}\)

\(5.30 \times 10^{22} *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23}}\)

\(\frac{5.30 \times 10^{22} }{6.022 \times 10^{23}} \ mol \ Ba(NO_3)_2\)

\(0.0880106276984 \ mol \ Ba(NO_3)_2\)

Next, convert moles to grams using the molar mass. The molar mass of barium nitrate is 261.35 grams per mole.

Set up a conversion factor using the molar mass.

\(\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

Multiply by the number of moles we calculated.

\(0.0880106276984 \ mol \ Ba(NO_3)_2 *\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

The units of moles of barium nitrate cancel.

\(0.0880106276984*\frac{ 261.35 \ g \ Ba(NO_3)_2} {1}\)

\(23.001577549 \ g \ Ba(NO_3)_2\)

If this is rounded to the tenths place, the 0 in the hundredth place tells us to leave the 0 in the tenths place.

\(23.0 \ g \ Ba(NO_3)_2\)

The mass of 5.30 ×10²² formula units of barium nitrate is approximately 23.0 grams.