If a star has an absolute magnitude of 10 and a temperature of 20,000 K, under which spectral class would the star be classified?

A

O

B

F

Phenol has a molecular weight of 94.11. The chemical name for phenol is C6H5OH, and it is an aromatic organic compound.

Equation:

step by step:

It is a volatile white crystalline substance. A phenyl group is joined to a hydroxyl group to form the molecule.

The total atomic weight of the atoms in the molecule makes up the molecular weight. Phenol has the chemical formula C6H5OH.

- The carbon atom's weight is 12.

Atomic weights of hydrogen and oxygen are 1 and 16, respectively.

The atomic weights of all the atoms that make up phenol are added, and the result is that phenol has a molecular weight of

=6(12)+5(1)+16+1 =94.11

Consequently, phenol has a molecular weight of 94.11.

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Answer:one mole of NaCl weighs 58.44 g. A 2.5 M solution is 2.5 moles per liter (Molarity is just the number of moles per liter). Therefore, 0.5 L would contain 1.25 mol. Hence, you would need 1.25 × 58.44 g = 73 g.

Explanation:The formula for calculating a dilution is (C1) (V1) = (C2) (V2) where...

C1 is the concentration of the starting solution.

V1 is the volume of the starting solution.

C2 is the concentration of the final solution.

V2 is the volume of the final solution.

The volume of the CO₂ collected over water at 38.0 °C when a mixture of 55.5 g of citric acid and excess sodium bicarbonate is added to a tub of water is 24.9 L

First, we shall determine the number of mole of CO₂ obtained from the reaction. Details below:

C₆H₈O₇(s) + 3 NaHCO₃(s) + H₂O(l) → Na₃C₆H₅O₇(aq) + 4 H₂O(l) + 3 CO₂(g)

From the balanced equation above,

1 mole C₆H₈O₇ reacted to produce 3 mole of CO₂.

Therefore,

0.289 mole CaCO₃ will react to produce = 0.289 × 3 = 0.867 mole of CO₂.

Finally, we shall determine the volume of the CO₂ produced. This is illustrated below:

PV = nRT

Divide both sides by P

V = nRT / P

V = (0.867 × 0.0821 × 311) / 0.889

V = 24.9 L

Thus, the volume of CO₂ obtained is 24.9 L

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Answer: D

Explanation: Cause im always right

The product of the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al because metals replaces metals.

Displacement reactions are those, in which one or two species are displaced from a reactant by the reagent. There are two types of displacement reactions namely single displacement and double displacement.

In single displacement reactions, one atom or group from a reactant is replaced by other group. In double displacement, two group of different reactants are exchanged each other.

The reaction between Al₂S₃ and Li is written below:

[tex]\rm Li + Al_{2}S_{3} \rightarrow Li_{2}S_{3} + 2 Al[/tex]

Here, metal Li replaces metal Al. Thus, option A is correct.

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Answer:

0.83 moles

Explanation:

To find the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water, we can use the mole ratio from the balanced chemical equation. The mole ratio is the ratio of the number of moles of each reactant and product in the chemical reaction.

In the given reaction, the mole ratio of NO2 to NO is 3:1. This means that for every 3 moles of NO2, 1 mole of NO is formed. Therefore, if we have 2.50 moles of NO2, the number of moles of NO that are formed will be 1/3 of that amount, which is 2.50 moles / 3 = 0.83 moles.

Therefore, the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water is 0.83 moles.

Transcription is said to be synthesis of RNA from DNA. Genetic information flows in the direction from DNA to proteins, the substances that give organisms shape. This information flow occurs through a cascade of processes of transcription (DNA to RNA) and translation (RNA to protein). Transcription occurs when a particular gene product is needed  at a particular time or in a particular tissue.

Normally only his one strand of DNA is copied during transcription. This is called the template strand, and the resulting RNA molecule is a single-stranded messenger RNA (mRNA). In eukaryotes (organisms with cell nuclei), the first transcript is called pre-mRNA. Pre-mRNAs are extensively edited by splicing before mature mRNAs are generated and ready for translation by ribosomes, organelles that serve as sites for protein synthesis. Transcription of any gene occurs at that gene's chromosomal location, which is a relatively short segment of the chromosome. Active transcription of a gene depends on the need for activity of that particular gene in a particular cell or tissue or at a particular time.

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The complete question is as follows:

Below is shown the lac operon in a single possible situation. Study the figure carefully, then select what is expected to be occurring in terms of

(a) glucose concentration

(b) lactose concentration during this situation.

CAP + cAMP and inducer-repressor complex below operon

(c) transcription level

CAP site empty and inducer-repressor complex below operon

246 grams are in 7.84 x 10²² no. particles of Zn(NO₃)₂

A particle is any fundamental piece of matter or energy, according to science. A particle is an amount of stuff that scientists or engineers use to build hypotheses about their field of study. There are no size restrictions when defining a particle.

As we know,

molar mass of zinc (Zn) = 65.38 gm

molar mass of Zn(NO₃)₂ = 189.36 gm

or we can say,

1 mol of Zn(NO₃)₂ contains 189.36 gm of mass.

Also, 1 mol of Zn contains 6.023 × 10²³ no. of particles.

So, 6.023 × 10²³ no. of particles have mass 189.36 gm.

7.84 x 10²²  no. of particles have mass 246 gm.

246 grams are in 7.84 x 10²² no. particles of Zn(NO₃)₂.

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The every atom in H₂CO molecule has bond angle is 120 °. the bond angle HCH is 116 ° and The bond angle of H₂CO is 122°.

The H₂CO has trigonal planar molecular geometry. the H₂CO has the same electron geometry that is trigonal planar. The every atom atom attached to the central atom has bond angle is  120 °. the central atom is surrounded by three regions of the electron density. according to the VSEPR theory the molecular geometry is trigonal planar. The  H₂CO is the polar molecular. the hybridization is sp².

Thus, the bond angle in  H₂CO is 120 ° and the molecular geometry is trigonal planar.

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The equation of line of best fit is y = -0.8x + 29.25 and the time spent doing homework for a student who spends 15 hours watching TV is 17.25 hours.

The line of best fit is a mathematical concept that correlates points scattered across a graph. It is a form of linear regression that uses scatter data to determine the best way of defining the relationship between the dots. In order to determine the line of best fit, draw the approximate line between the given points using graphing tools and determine the slope and y intercept. Choose two points (15,15) and (10, 19). Hence, the slope is:

Slope = Rise / Run = (15 – 19)/(15 – 10) = - 0.8

y intercept = 29.25

a) The equation of the lines of best fit is: y = -0.8x + 29.25.

b) when x = 15 hrs

y = -0.8(15) + 29.25

y = 17.25 hours

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An excess demand will emerge if a minimum price is set below the equilibrium price. In the IPAD market, assuming everything else stays the same.

Federal milk marketing orders, interactions with the federal dairy price assistance program, and wholesale commodity prices for cheese, butter, nonfat dry milk, and dry whey all play a significant role in determining milk pricing at the farm level.

Demand for everyday items like milk declines as consumer incomes fall. A lower milk price will result in an increase in the supply of all goods containing milk as an ingredient.

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The theoretical yield of the reaction between 6.20 g of carbon with excess oxygen is 22.7 g. The actual yield is given 8.35 g. Thus, the percent  yield is 36.7 %.

Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.

One mole or 12 g of C gives one mole of carbon dioxide. Molar mass of CO₂ is 44 g/mol. Thus, the mass of carbon dioxide that can be produced from 6.20 g of C is :

= (6.20 × 44 ) / 12 g = 22.73 g.

The actual yield of CO₂ is 8.35g only. Thus, its percent yield is calculated as :

percent yield = 8.35 g/ 22.73 g × 100 = 36.7 %.

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Brianne feels shocked and sad when she sees the wreckage in far rockaway.

This is referred to as a subjective point of view which is used to depict specific sensations based on different factors and circumstances. Examples of feelings include shock, excitement etc which denotes the state of mind of the individual.

In the incidence of a hurricane, she paid attention to the extent of the damaged situation. She watched the news and was in total shock as it narrated the destruction of places she loved and went to for various reasons which is therefore how she felts when she saw the wreckage.

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Sulfur is a chemical element with the atomic number 16 and the symbol S.

The nonmetallic chemical element sulfur (S), also spelled sulfur, is one of the most reactive elements and is a member of the oxygen group (Group 16 of the periodic table). A pale yellow solid with no flavour or odour, pure sulphur is also insoluble in water and has poor electrical conductivity. It is also brittle and tasteless.

The elements sulphur and metal sulphide ores are both found naturally. Near hot springs and volcanoes is where it can be found in its natural state. The tenth most prevalent element, sulfur, is present in nearly all plant and animal life, meteorites, the ocean, the earth's crust, and the atmosphere.

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Answer:

Explanation: Use the ideal gas law formula

PV = nRT

P = pressure (atm)

V = volume (L)

n = moles

R = universe gas constant (.0821)

T = temperature (K)

-- the given temperature is in Celcius to convert it to Kelvin you add 273 to it

plug in the numbers and solve for n

1. True – A set of p orbitals can accommodate a maximum of 6 electrons because each p orbital can contain 2 electrons with opposite spins.

2. False – There are only 5 d orbitals in a set, not 10. The d orbitals are divided into five distinct shapes: dz2, dx2-y2, dxz, dyz, and dxy.

3. True – None of the p orbitals are spherically symmetric because they have an elongated shape. This is due to the fact that they have an angular momentum of 1, whereas s orbitals have an angular momentum of 0.

4. True – The fifth shell (or major energy level) has one set of f orbitals which can accommodate a maximum of 14 electrons. The f orbitals are divided into seven distinct shapes: fz3, fxz2, fyz2, fx(x2-3y2), fy(3x2-y2), fxyz, and fx(x2-y2).

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Complete question:

1. a set of p orbitals can accommodate a maximum of 6 electrons.

2. there are 10 d orbitals in a set.

3. none of the p orbitals are spherically symmetric.

4. The fifth shell (or major energy level) has one set of f orbitals.

mark each statement as True or false

The anion name on the left with the name of the acid containing that anion on the right:

1) chloride Cl⁻ = hydrochloric acid

2) sulfite SO₃²⁻ =  sulfurous acid

3) sulphate SO₄²⁻ = hydro sulfuric acid

4) chlorite ClO₂⁻ = chlorous acid

1) chloride Cl⁻ = hydrochloric acid because the hydrochloric acid, HCl contain anion that is Cl⁻.

2) sulfite SO₃²⁻ =  sulfurous acid because the sulfurous acid H₂SO₃ that contains anion as  SO₃²⁻.

3) sulphate SO₄²⁻ = hydro sulfuric acid because the hydrosulfuric acid H₂SO₄ contains the anion as SO₄²⁻.

4) chlorite ClO₂⁻ = chlorous acid because the the chlorous acid , HClO₂ contains the anion as ClO₂⁻.

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Yes, most definitely.

These regenerative brakes collect kinetic energy that normally dissipate as heat when the car slows down. The knee device collects energy lost when a person brakes the knee after swinging the leg forward to take a step, the researchers said.

I hope my answer helped you! If you need more information or help, comment down below and I will be sure to respond if I am online. Have a wonderful rest of your day!

The expression for the pressure of an ideal gas by means of kinetic theory is P = J / V.

According to the kinetic theory, a gas is made up of numerous submicroscopic particles (atoms or molecules), all of which are moving randomly and continuously. The container's walls and the quickly moving particles constantly collide in this situation.

It should be noted that based on the information, the formula illustrated will be:

f² = u²+ v² + w²

p = mv

where P = momentum

m = mass

v = velocity

Time = Distance / Speed

Force = mass × velocity² / distance

Pressure = force / area

J = mn

P = J/V

where

J = total mass

V = total volume

p = density of gas.

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To solve such this we must know the concept of chemical reaction. Therefore, the pressure of the dry gas alone is 1.27 atm. The dry gas is always collected in water.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

pressure of water vapor = 2.20 kPa=2,200Pa = 0.022 atm

pressure of water vapor + pressure of gas =1.3 atm

substituting all the given values in the above equation, we get

0.022 atm + pressure of gas =1.3 atm

pressure of gas = 1.3 - 0.022

                         = 1.27 atm

Therefore, the pressure of the dry gas alone is  1.27 atm.

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Answer:

I think it means something thats very good

Cumene reacts at a faster rate when heated with N-Bromo succinimide and benzoyl peroxide in carbon tetrachloride.

When NBS and benzoyl peroxide in carbon tetrachloride reacts, they follow radical mechanism, which gives a bromination reaction and the position at which bromination occurs is benzylic position. cumene is an organic compound that contains a benzene ring with an isopropyl substituent and when reacts with chlorine forms the most stable carbocation and become most acidic. Now, the most radical formed due to reaction at benzylic position is only provided by cumene because it forms 3° radical i.e., tertiary carbocations which is more stable than secondary and primary cations.

Hence, cumene reacts at a faster rate.

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Answer:

C. Check if the ions of two compounds exchange places.

The frequency of the given wave is equal to 6.32 × 10¹⁶ Hz.

The frequency of the wave can be defined as the number of cycles of a wave in one second. The S.I. units of frequency are per second (s⁻¹) or Hertz.

The wavelength can be defined as the distance between the two crests or troughs in phase with respect to each other.

The expression between wavelength, speed of light, and frequency (ν) is:

c = νλ

Given, the wavelength of the wave, ν = 4.75 ×10⁻⁹ m

The speed of light, [tex]c = 3 \times 10^8 m/s[/tex]

The frequency of the waves can be calculated from the above-mentioned relationship:

ν = c/λ = 3 × 10⁸/4.75 ×10⁻⁹  = 0.632 × 10¹⁷ = 6.32 × 10¹⁶

Therefore, the frequency of the wave is equal to  6.32 × 10¹⁶ Hz.

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A sample of potassium nitride contains 0.900 moles of potassium ions. 2.689 moles of nitride ions do it contain

1 mole is defined as 6.023 x 1023 ions.

Here, there are 5.4 x 1022 ions, or 0.08965 moles (5.4 x 1022/6.023 x 1023).

Calcium: C +1

Nitric acid: N -3

Three potassium's are required to balance out the -3 charge that one nitride possesses since the total charges must cancel out.

K3N

Moles of potassium ion are therefore 3 x 0.08965, or 2.689 moles.,

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Taking into account the definition of molarity, the mass of solute present in 705 mL of 0.470M KBr is 39.43 grams.

Molarity is a measure of the concentration of a solute in a solution expressed in the number of moles dissolved per liter of solution. This is, the molarity indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by:

molarity= number of moles÷ volume

Molarity is expressed in units moles/L.

In this case, you know:

Replacing in the definition of molarity:

0.470 M= number of moles÷ 0.705 L

Solving:

0.470 M× 0.705 L= number of moles

0.33135 moles= number of moles

Being the molar mass of KBr 119 g/mole, the mass of the compound can be calculated as:

mass= molar mass× number of moles

mass= 119 g/mole× 0.33135 moles

mass= 39.43 grams

Finally, the mass of solute is 39.43 grams.

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The options B, C and D, are the statements that correctly describe van der Waals radii.

Van der Waals radii are an important concept in chemistry, as they provide insight into how atoms interact with one another. Put simply, van der Waals radii are the distance between two covalently bonded nuclei. These radii are used to determine how close any two molecules can approach each other, and this information is essential for understanding how atoms in a molecule interact and behave.

In general, van der Waals radii increase from left to right across a period in the periodic table. This means that atoms located on the left-hand side of the table have smaller radii than those located on the right-hand side. This is due to the fact that the number of electrons in each atom increases as you move across the period.

Additionally, the van der Waals radius for a given atom is always larger than its covalent radius. This is because the van der Waals radius takes into account the non-bonded interactions between atoms, which can be attractive or repulsive.

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Answer:

C

Explanation:

Three resonant structures can be seen in the S2O Lewis structure. Within the molecule, double bonds may form as a result of the transfer of electron pairs from the outer sulfur and oxygen atoms. As a result, the stable S2O Lewis structure with no formal charges is formed.

The Octate rule does have three common exceptions, though: molecules with an odd number of electrons, such as NO; molecules like SF6 in which one or more atoms have more than eight electrons; molecules with one or more atoms that have fewer than eight electrons, such as BCl3.

Carbon monoxide's Lewis-dot structure is as follows:

C≡O:

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The properties of the shells that are closer to the nucleus are they have less energy. Therefore, option C is correct.

In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this.

The 1n shell, which is the one nearest to the nucleus, may accommodate two electrons, while the 2n and 3n shells can accommodate eight and eighteen electrons, respectively. The reactivity of an atom—or propensity to establish chemical interactions with other atoms—depends on the amount of electrons in its outermost shell.

The position of an electron in relation to an atom's nucleus can be used to calculate its energy. The energy level decreases as the electrons get nearer to the nucleus.

Thus, option C is correct.

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Clearly, the only factors that affect a substance's gaseous state at a given temperature are pressure, the number of molecules present, and its volume. The state parameters are P, V, n, and T.

Three state variables—absolute pressure (P), volume (V), and absolute temperature—define an ideal gas (T ). We must add a fourth variable, the amount of moles, to these three state variables.

Three characteristics of gases are as follows: They take up much more room than the liquids or solids they produce because they are (1) simple to compress, (2) expand to fill their containers, and (3) take up much more area.A good illustration of how easily gases can be compressed is an internal combustion engine.

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