Which of the following elements is a noble gas?

A) Sodium
B) Chlorine
C) Argon
D) Calcium

The vapor pressure of the solution can be calculated using the expression of Clausius-Clapeyron equation. Putting the value of 23.5g of glycerin in 130g of methanol in the equation we get the result.

The vapor pressure can be defined as the force that an evaporating substance exerts against the walls of a sealed container.

         ln (P1/P2) = (ΔHvap. /R) (1/T2 - 1/T1)

Here where  P1 and  P2 are the vapor pressures at two temperatures T and T2 . Clausius - Clapeyron equation allows to estimate the vapor pressure at another temperature if the vapor pressure is known at some temperature and if the enthalpy of vaporization is known. The partial vapor pressure of a component in a mixture is equal to the vapor pressure of the component at that temperature multiplied by the component's mole fraction.

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The type of bond formed between two atoms having opposite charges is an ionic bond.

There are mainly two types of bonds formed between two atoms depending upon the way in which the combining atoms attain an octet structure in their valence shell.

First is, Ionic bonds. These are formed by the transfer of one or more valence shell electrons from a metal atom to the valence shell of a non-metal atom both containing opposite charges. Ionic compounds exist as ions also.

Next is Covalent bonds. These bonds are formed by the mutual sharing of electrons between the two combining atoms and they contribute an equal number of electrons for sharing. Covalent compounds only exist as molecules.

Other than these there are other types of bonding as well.

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The minutes in which the car was fastest were 1 to 4 and the speed was 733 meters per second , and the minutes in which the car was the slowest were 4 to 5 and the speed was 100 meters per second.

The speed can be calculated using a simple formula: distance /time. Moreover, in a graph, you can know whether the car is going fast or slow depending on the slope of the line.

From minute 1 to minute 4 as the distance covered was 2200, then 2200 / 3 = 733 meters per second.

From minute 4 to minute 5 as the distance was only 100 meters, then 100/1 = 100 meters per second

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28.0 grams of HCl are required to produce 459.5 g grams of Cl2.

To find out how many grams of HCl are required to produce 11.2 grams of Cl2, we need to use the balanced equation for the reaction between MNO2, HCl, MnCl2, and Cl2.

MNO2(s) + 4HCl(aq) → MnCl2(aq) + Cl2(g) + H2O

From the balanced equation, we can see that 1 mole of MNO2 reacts with 4 moles of HCl to produce 1 mole of Cl2.

To convert the mass of Cl2 to moles, we use the molar mass of Cl2, which is 35.5 g/mol:

11.2 g Cl2 / 35.5 g/mol = 0.316 mol Cl2

Since the reaction requires 4 moles of HCl for every 1 mole of Cl2, we can use the ratio between moles of HCl and moles of Cl2 to find the number of moles of HCl:

4 moles HCl / 1 mole Cl2 = 4 moles HCl/ 0.316 moles Cl2 = 12.6 moles HCl

To convert moles to grams, we use the molar mass of HCl, which is 36.46 g/mol:

12.6 moles HCl x 36.46 g/mol = 459.5 g HCl

Therefore, 28.0 grams of HCl are required to produce 11.2 grams of Cl2.

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Using  Speed, distance and time relation, the distance is 400 kilometers.

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting or ending position.

The International System of Units defines a metre as the distance unit. It's interesting to note that many other derived units or quantities, such as volume, area, acceleration, and speed, may be constructed using this as the basic unit and a few formulae.

20 kilometers per hour is the speed per half-hour.

⇒ Speed in kilometers per hour: 40 × 2 = 80

Distance x time = speed

Distance = Time × Speed

= 80 × 5

= 400 miles

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Bromine is the only non metal that exists in liquid state at the room temperature.

Bromine belongs to the member of halogen group. Heavy, volatile, mobile etc are some of the characteristics of it. Bromine is quite dangerous.

It has red brown color at room temperature. It is very reactive as it evaporates quickly to form a similar colored gas.  

Bromine molecules depicts strong inter-molecular force so that's why it doesn't evaporates at room temperature.  It also shapes up diatomic molecules and Van Der Walls interactions are highly strong.

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Answer:

helium

Explanation:

TLC method is mostly often used for the qualitative as well as quantitative sample analysis.

TLC (Thin layer chromatography) is an affinity based method which is used to separate the compounds present in a mixture. TLC is a highly versatile separation method which is widely used for both qualitative as well as quantitative sample analysis. It can be used to analyze the virtually any substance class, including steroids, alkaloids, lipids, nucleotides, glycosides, carbohydrates, as well as fatty acids.

Thin Layer Chromatography is that technique which will be used to isolate the non-volatile mixtures. The experiment is conducted on a sheet of the aluminum foil, glass or plastic which is coated with a thin layer of adsorbent material. The material which is usually used i.e aluminum oxide, silica gel or cellulose. After completion of the separation, each component will appears as spots and separated vertically.

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Answer:

The atomic radius of sodium (Na) is larger than the atomic radius of phosphorus (P). This means that the atoms of sodium are larger in size than the atoms of phosphorus.

In terms of metallic properties, sodium is a metal while phosphorus is a nonmetal. Metals typically have a shiny appearance, high thermal and electrical conductivity, and are typically malleable and ductile. Nonmetals are typically dull, poor conductors of heat and electricity, and are typically not malleable or ductile.

Sodium is a highly reactive metal and is usually found in nature as a compound rather than a pure element. It has a low melting point and boiling point, and is a good conductor of heat and electricity. Phosphorus is a nonmetal that can exist in different allotropic forms, white phosphorus is highly reactive, and red phosphorus is less reactive. It has a low melting and boiling point and is a poor conductor of heat and electricity.

In summary, the atomic radius of sodium is larger than that of phosphorus and sodium is a metal while phosphorus is a nonmetal. Sodium has properties of high reactivity, low melting point and boiling point and good conductivity of heat and electricity while Phosphorus has properties of low reactivity, low melting and boiling point and poor conductivity of heat and electricity.

Carbon dioxide reacts with water in a reversible reaction to form carbonic acid (H2CO3).

What is meant by Carbon dioxide ?

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The atmosphere's rising carbon dioxide concentrations are causing an increase in the greenhouse effect.

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According to the stoichiometry of the given chemical equation, 24,295 g of liquid oxygen would a rocket have to carry to burn 14 kilograms (14,000 g) of diborane completely.

The measurement of element or compound amounts in a chemical process is known as stoichiometry. The laws of conservation of mass and merging weights and volumes serve as the foundation for the linked relationships.In quantitative analysis, stoichiometry is used to calculate the concentrations of various substances in the sample.

It helps make solutions with different concentrations that can be used in titrations and balance chemical equations. 48 g oxygen gives 27.66 g diborane thus, for 14000 g diborane 14000×48/27.66= 24,295 g oxygen is required.

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Answer:

D. To restore the population of a species

Explanation:

Captive-breeding programs breed endangered species in zoos and other facilities to build a healthy population of the animals. Species-survival plans coordinate with zoos around the world to bring species together for breeding that ensures genetic diversity.

Answer: Under normal conditions. Each cell in the human body has 23 pairs of chromosomes (46 in total). Half come from the mother and half from the father.

Explanation: Chromosomes are transferred in pairs.

Under normal conditions. Each cell in the human body has 23 pairs of chromosomes (46 in total). Half come from the mother and half from the father.

Two of these chromosomes (the X and the Y chromosome) determine one’s sex as male or female. They are called sex chromosomes:

• Females have 2 X chromosomes.

• Males have 1 X and 1 Y chromosome.

The mother gives an X chromosome to the child. The father may contribute either X or Y. The chromosome from the father determines if the baby is born male or female.

The remaining chromosomes are called autosomal chromosomes (22 pairs).

1 chromosome from mother+ 1 chromosome from father+ 22 pair autosomal chromosomes= 46

Answer:

We inherit a set of 23 chromosomes from our mothers and another set of 23 from our fathers. One of those pairs are the chromosomes that determine the biological sex of a child – girls have an XX pair and boys have an XY pair, with very rare exceptions in certain disorders.

Conjugated dienes are two double bonds separated by a single bond. Nonconjugated Dienes are two double bonds are separated by more than one single bond.

In general , p-orbitals were used to identify conjugation. These p-orbitals are significantly used to make double bonds, so a lone pair  is present in p-orbitals if it is conjugate . Hence, To be a conjugated atom it must have three or more p-orbitals in a row.

If we talk about Conjugated system, the covalent chemical compound, a group or chain of atoms that carries valence electrons  and they are not engaged in single-bond formation so they modify the behavior's of each other atoms present in the vicinity .

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If Rutherford's idea that electrons radiate energy while orbiting around the nucleus was true, it would have strengthened the idea of the Bohr model of the atom, which also proposed that electrons occupy specific energy levels or orbitals around the nucleus.

This model was developed by Niels Bohr in 1913 and was based on the idea that electrons move in quantized orbits around the nucleus, similar to how planets orbit the sun.

The Bohr model was able to explain the observed spectral lines of hydrogen and was able to predict the energy levels of other atoms. Thus, the Rutherford's planetary model and the Bohr model would have been consistent with each other.

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There are 18.066 x 10^23 molecules of H2O.

1 mole of a substance is defined as the amount of that substance that contains Avogadro's number of entities, which is 6.022 x 10^23. This number is also known as Avogadro's constant.

It is important to note that Avogadro's constant is specific to the number of entities (atoms, molecules, ions, etc.) and not the mass or volume of a substance.

In the case of H2O (water), each molecule of water is made up of 2 hydrogen atoms and 1 oxygen atom. Therefore, 1 mole of H2O contains 6.022 x 10^23 molecules of H2O, each containing 2 hydrogen atoms and 1 oxygen atom.

So, when we have 3 moles of H2O, we have 3 x 6.022 x 10^23 = 18.066 x 10^23 entities of H2O. As each molecule of H2O contains 2 hydrogen atoms and 1 oxygen atom, this means that we have 18.066 x 10^23 molecules of H2O.

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Answer:

0.016 moles

Explanation: Because you are doing P4, you take the molar mass/atomic mass of phosphorous which is 30,97(rounded up) and multiply it by 4 since that's the subscript. Then you take 2.0 grams and divide it by the molar mass, which is 123.88, and that gives you 0.016 moles (rounded up)

In thin‑layer chromatography (TLC) plate 1: possible

middle: dot on top

dot w/circle on bottom

rest: impossible

Non-volatile mixtures can be separated using the chromatography technique known as thin-layer chromatography (TLC). A sheet of an inert substrate, such as glass, plastic, or aluminum foil, is used for thin-layer chromatography. This substrate is covered with a thin layer of an adsorbent material, often silica gel, aluminum oxide (alumina), or cellulose. In the TLC process, a solvent or combination of solvents serves as the mobile phase. You've come to the correct site if you want to learn more about the thin layer chromatography process. Here, we'll talk about its basic idea, how it works, and how it may be used in many fields of business.A line is often drawn 0.5–1.0 cm from the bottom of a thin layer chromatography plate, which is typically 5-7 cm high. You will place your mixes along that line for separation.

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The variance in the US continental region is brought on by the shift in daytime and nighttime weather patterns.

Cold, dry, and stable air masses are found in the continental polar (cP) or continental arctic (cA) regions. Radiative cooling causes these air masses to form over northern Canada and Alaska. They travel south, then east via the Plains and the Rockies.

During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south. Low humidity and temperature are both present.

These factors contributed to the polar air mass:

During the colder months of the year, continental polar air typically forms over vast land masses.

A cool breeze blows across the upper section of the area, while a warm breeze blows through the lower part.

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Answer: Hexanol -> Alcohol, Isobutyl acetate -> Ester, Octanol -> Alcohol, Propanoic acid -> Carboxylic Acid, Benzophenone -> Ketone, Dimethyl ether -> Ether, Chlorpheniramine -> N-Base.

What are functional groups?

A functional group in organic chemistry is a collection of atoms in a molecule that binds together to react predictably. Examples of functional groups include hydroxyl, ketone, amine and ether groups.

Therefore, the above are the types of the molecules derived from the name of the molecule.

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The recycling plant needs to separate two types of plastic: ABS, d = 1.15 g/mL and PET, d = 1.35 g/mL. No, the two plastics will not be separated because both types would sink when added to the solution of NaCI. Therefore, option A is correct.

The term density is defined as the ration of mass and volume. It is represented by the formula as follows:

Density = Mass / Volume

If an object is denser than NaCl solution, then it will sink when placed in solution, and if it is less dense than NaCl solution, it will float.

The densities of both ABS and PET are more than the density of NaCl solution, Therefore both will sink in the NaCl solution.

Thus, option A is correct.

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The two primary methods for increasing current in an electrical circuit are to increase the voltage or to decrease the resistance.

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Answer:

both

Explanation:

The three scientists' measurements are both accurate and precise.

Accuracy refers to how close a measurement is to the true value, and precision refers to how close multiple measurements are to each other.

In this case, the measurements are accurate because they are all very close to the true value of the standard meter bar, which is defined as 1 meter.

The measurements are precise because all the measurements are very close to each other. They are all within 0.01 m of each other, indicating that the scientists are able to consistently measure the same length, indicating that they are precise in their measurements.

It's worth noting that, even though the measurements are accurate and precise, it's still possible to have a small measurement error, this is because the true value of the standard meter is not 1.09 m or 1.08 m, but the International System of Units defined it to be exactly 1m, and the difference between the measurements and the true value is very small.

The measurements provided by the three scientists are precise but not accurate.

The measurements provided by the three scientists can be analyzed in terms of accuracy and precision. Accuracy refers to how close the measured values are to the true value, while precision refers to how close the measured values are to each other. In this case, the measured values are 1.09 m, 1.09 m, and 1.08 m. These measurements are not accurate because they are not equal to the true value of a standard meter bar, which is 1.00 m. However, they are precise because they are very close to each other.

Although the measurements are not accurate, they are consistent with each other, indicating precision in the measurements. In scientific experiments, it is important to have both accuracy and precision. Accurate measurements ensure that the measurement is close to the true value, while precise measurements establish consistency and reliability in the experiment results.

In conclusion, the measurements provided by the scientists are precise but not accurate.

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1.0 mole of Potassium fluoride is mixed to get 0.10 L of solution is 10 M  and 17.85 mole / L is the concentration of resulting solution of NH₃

Molarity = mol solute / L solution

= 1.0 mol/0.10 L

= 10 mol/L

= 10 M.

2 .28g (grams) of NH3 is dissolved in 500 mL of water. result of concentrating solution :

Molarity, M= number of moles/ volume of solution

                             M= n/ V

Number of moles, n= mass /molar mass

Molar mass of NaOH=500L/mole

                            Mass=28g

                             n= 500/28

                               ​ = 17.85 mole/ L

3. Claude wants to make 2L of 0.5 solution of AgCl , grams needed for solution :

                   0.5 mole/ 2 liter x 180 grams/mole x 2 liter

                          = 180 g

KF is the chemical formula for the compound potassium fluoride. KF is the most widely used source of fluoride ions in chemical and manufacturing processes, surpassing hydrogen fluoride. Carobbiite, a rare mineral, is where you can naturally find potassium fluoride, an alkali halide. Potassium fluoride is a white, crystalline, salty-tasting powder. It looks like sand. utilized as an insecticide, preserver, and etchant for glass.

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If you have sound wave moving at 340 m/s and a frequency of 100 Hz , the wavelength is 3.4 m.

Given that :

The velocity of the sound wave = 340 m/s

The frequency = 100 Hz

The wavelength expression is given as :

Wavelength = velocity / frequency

where,

velocity = 340 m/s

frequency = 100 Hz

Wavelength = 340 / 100

Wavelength = 3.4 m

Thus, the wavelength is 3.4 m if the sound wave velocity is 340 m/s and the velocity is 100 Hz. The wavelength is the distance between crests in the adjacent cycles of the waveform.

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Answer:

Genetic code consists of a sequence of nucleotides which are the building blocks of DNA. Each nucleotide contains a four-letter code, which is used to construct proteins in the organism. These proteins are responsible for the physical and behavioral traits of the organism. Changes in the genetic code can occur through mutation, which is when a mistake is made in the nucleotide sequence during DNA replication. This can lead to changes in the proteins and the traits of the organism. Some of these changes can be beneficial, while others can be harmful. Ultimately, the effects of these genetic changes depend on the environment in which the organism lives and the type of change that has occurred.

To determine how many chlorine atoms are present in a 7.30 g sample of iron(II) chloride (FeCl2), you can use the molar mass of FeCl2 and the given mass of the sample.

First, you need to convert the mass of the sample from grams to moles using the molar mass of FeCl2:

mass (g) / molar mass (g/mol) = moles

7.30 g / 126.8 g/mol = 0.0578 moles

Iron(II) chloride is composed of one atom of Iron and two atoms of chlorine, so for every 1 mole of FeCl2, there are 2 moles of chlorine atoms.

To find the number of chlorine atoms in the sample, we need to multiply the number of moles of FeCl2 by the number of chlorine atoms per mole:

moles of FeCl2 x (number of chlorine atoms / 1 mole of FeCl2) = moles of chlorine atoms

0.0578 moles x 2 = 0.1156 moles

To convert moles of chlorine atoms to the number of atoms, we need to multiply by Avogadro's number which is 6.022 x 10^23 atoms/mol

0.1156 moles x 6.022 x 10^23 atoms/mol = 6.93 x 10^22 atoms of chlorine.

So 7.30 g sample of iron (II) chloride contains 6.93 x 10^22 atoms of chlorine.

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To find the number of moles of a substance, you need to divide the mass of the substance by its molar mass.

The molar mass of Rb2S is (2x85.468 + 32.06) g/mol = 212.996 g/mol

So, to find the number of moles of Rb2S in 368g, you would divide 368g by 212.996 g/mol :

moles = 368 g / 212.996 g/mol = 1.73 moles

There are 1.73 moles of Rb2S in 368g.

Two species can directly compete for the same resource when they are in contact with one another such as for food, space, mates, or water.

One example of direct competition is two lions competing for a mate.

Competition can be described as the direct or indirect contact of organisms that results in a change in fitness when the organisms share a resource.

Competition is most commonly thought of as the interaction of individuals that compete for a common resource that is in limited supply.

Individuals who directly compete with one another for the same resource are said to be in direct competition.

Some examples of competition are:

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The word particle comes from the fact that a neutron, which is what is found in the nucleus of an atom, has no electrical charge and is therefore electrically neutral.

Describe neutrons.

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