Which of the following sets of quantum numbers are not allowed in the hydrogen atom? For the sets of quantum numbers that are incorrect, indicate what is wrong in each set.
(a) n = 3, ℓ = 2, mℓ = 2
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid

(b) n = 4, ℓ = 3, mℓ = 4
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid

(c) n = 0, ℓ = 0, mℓ = 0
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid

(d) n = 2, ℓ = -1, mℓ = 1
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid

Answer:

The purpose of a Bohr model is to show the atom(s) as a central nucleus; containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus.

Explanation:

Have a great rest of your day
The one and only,
-Mr. Universe

In 1913 Bohr proposed his model of the atom , it's purpose was to explain how electrons can have stable orbits around the nucleus. It shows electrons orbiting the nucleus of an atom -He found that electrons farther away from the nucleus have more energy, meaning the electrons that are closer to the nucleus have less energy.

For example...(shows  Bromine )

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The volume of water used is 500cm^3.

The volume of water used.

NaOH concentration in mol/dm^3=NaOH concentration in g/dm^3/molar mass of NaOH.

M of NaOH=23+16+1=40

M=40 g/mol

0.2mol= concentration of NaOH in g/dm^3/40g/mol

=0.2mol/dm^3*40g/mol

=8g/dm^3

we know that,

1dm^3=1000cm^3

4.00g of NaOH will be dissolved in 4g*1000cm^3/8g

=500cm^3 of water

So, the volume of water used is 500cm^3.

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Answer:

20cm³

Explanation:

Volume = Molarity*number of moles

number of moles = Mass given/Molar mass

number of moles= 4.00g/40.0g

number of moles= 0.1mols

thus:

Volume= 0.200mol/dm³*0.1mol

Volume= 0.02dm³(20cm³)

The number of protons in lithium is 3, in sodium is 11 and in potassium is 19 whereas the mass number of lithium is 6.941 u, the mass number of sodium is 22.989769 u and the mass number of potassium is 39.0983 u.

Numbers of Protons:

The total number of protons in lithium is 3.

The total number of protons in sodium is 11.

The total number of protons in potassium is 19.

Mass Number:

The mass number of lithium is 6.941 u.

The mass number of sodium is 22.989769 u.

The mass number of potassium is 39.0983 u.

Structure of Lithium and Potassium:

Lithium and potassium have a similarity in them that they all have one electron in their outermost orbit.

Structure of Sodium and Potassium:

Sodium and potassium have a similarity in them that they all have one electron in their outermost orbit.

So we can conclude that the number of protons in lithium is 3, in sodium is 11 and in potassium is 19.

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By exchanging electrons with one another, atoms create new materials. When two atoms share at least one pair of electrons, this is known as a covalent link. Ionic bonds form when positive  are attracted to one another and share an electron as a consequence.

When two atoms share , they establish a  connection. Because the two positively charged atomic nuclei and shared, negatively charged electrons in a covalent bond are attracted to one another by electrostatic forces, the bond is stable.

One or more pairs of electrons from each atom are shared by the other atoms to form a covalent link. The two atomic nuclei are pulling these electrons in opposite directions. When the gap between two atoms' electronegativities is too narrow for an electron transfer to take place and form ions, a covalent bond is created.

Reactants interact with one another in a chemical reaction, breaking the bonds that hold their atoms together.

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Answer:

Here's your answer on the Image!

Explanation:

I took the K-12 Quiz

Answer: v = 0.70 ml

Explanation:

1. We can use the Density equation

(d = density (g/ml), m = mass (g), v = volume (ml))

D = m/v

2. Plug in what we have and solve for v.

2.7 = 1.9/v

v = 0.70 ml

Answer:

q2

Explanation:

Both the reactants are gases at STP.

Equation:

2H2S + 302 → 2SO2 + 2H2O

As per this equation 2 moles (2 x 22.4 L) of H2S

need 3 moles (3 x 22.4 L) of oxygen for their

complete oxidation.

So, volume of oxygen needed for 2.8 L of H2S =

(2.8 x 3 x 22.4)/(2 x 22.4) = 4.2 L (answer)

(a) H₂O(g) represents water in the gaseous state. It is produced as a product of the reaction between hydrogen sulfide (H₂S) and oxygen (O₂).

Gaseous state refers to a substance existing as a gas. When a substance is in the gaseous state, its particles are not closely packed together like in a solid or liquid state. Instead, they are spread out and move freely, filling the available space.

(b) To calculate the volume of oxygen required to react with 50 cm³ of hydrogen sulfide, we need to use the stoichiometry of the reaction. From the balanced equation, we can see that the molar ratio between hydrogen sulfide (H₂S) and oxygen (O₂) is 2:3.

Given: Volume of hydrogen sulfide (H₂S) = 50 cm³

Using the molar ratio, we can set up the following proportion: 2 mol H₂S / 3 mol O₂ = 50 cm³ H₂S / x cm³ O₂

To find the volume of oxygen, we can solve for x:

x = (50 cm³ H₂S * 3 mol O₂) / 2 mol H₂S

Now, we need to convert the obtained moles of oxygen to volume using the ideal gas law. Since the volume is given in cm³, we can assume that the temperature and pressure are constant at standard conditions (typically 0°C and 1 atm).

Using the ideal gas law equation: PV = nRT

Assuming constant temperature and pressure, we can rearrange the equation as: V = (n * R * T) / P

Substituting the values: V = (moles of O₂ * 22.4 L/mol) / (1 atm)

Calculate the moles of O₂ using the obtained value from the proportion.

Finally, convert the volume from liters to cm³ by multiplying by 1000.

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According to the given statement The molarity of the iron(II) solution is 0.648 M.

The amount of the sample in a specific solution volume is defined as its molarity (M). The molarity of a solute per litre of a solution is known as molarity. The molar concentration is yet another name for molarity.

Iron(II) solution volume (V₁) = 25.0 mL/0.025 L

Dichromate solution (V₂) has a volume of 18.0 mL, or 0.018 L.

Dichromate solution molarity (M₂) = 0.150 M

Molarity of dichromate solution is :

M₂ = n₂/V₂

(n₂  = M₂* V₂ = 0.150  * 0.018 = 2.7 * 10⁻³ mol

Complete balanced equation is given below.

[tex]6 \mathrm{Fe}^{2+}(a q)+\mathrm{Cr}_2 \mathrm{O}_7^{2-}(a q)+14 \mathrm{H}^{+}(a q) \rightarrow 6 \mathrm{Fe}^{3+}(a q)+2 \mathrm{Cr}^{3+}(a q)+7 \mathrm{H}_2 \mathrm{O}[/tex]

It is obvious from the equation that 1 mole of dichromate is needed to make 6 moles of iron(II) solution.

Therefore, we calculate the number of moles of iron(II) solution using the unitary technique.

1 mole of dichromate is equal to 6 moles of iron (II)

6n₂ moles of iron are equal to n₂ moles of dichromate (II)

=6 * 2.7 * 10⁻³ = 0.0162 mol Fe²⁺

So, 0.0162 moles of iron(II) is needed. Therefore,

Now, molarity of iron(II) solution is given as: n[tex]_1[/tex] = 0.0162

Molarity = Moles ÷ Volume

M₁ = n[tex]_1[/tex]/V₁

M₁ = 0.0162mol/0.025 L = 0.648 M

The molarity of the iron(II) solution is 0.648 M.

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The complete question is -

The titration of 25.0 mL of an iron(II) solution required 18.0 mL of a 0.150M solution of dichromate to reach the equivalence point. What is the molarity of the iron(II) solution?

The conversion of solar energy into the chemical energy of a carbohydrate occurs during the process of photosynthesis.

Certain organisms convert solar energy (sunlight) into chemical energy through photosynthesis, which is then used to construct carbohydrate molecules. When an organism breaks down food, the energy that was used to keep these molecules together is released.

The energy generated by photosynthesis continuously enters the planet's ecosystems and is transferred from one organism to another. As a result, the majority of the energy that all living things on Earth require comes from the process of photosynthesis, either directly or indirectly.

Oxygen is also released into the atmosphere as a result of photosynthesis. To summarize, humans rely almost entirely on photosynthesis-producing organisms for food and oxygen.

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Answer:

most things would melt

Explanation:

such as glaciers and ice caps in the arctic and Antarctic, causing many floods etc.

ur welcome

(B) Atomic nuclei would fly apart if strong force did not exist.

The nucleus occupies a small fraction of the atomic volume and contains the number of protons and neutrons characteristic of a particular isotope. Electrostatic repulsion forces normally cause positively charged protons to repel each other, but the nuclei do not fly off due to the strong nuclear force, the very strong but very short-range attraction between nucleons.

All stable nuclei except hydrogen have at least one neutron to overcome the electrostatic repulsion between protons. As the number of protons in the nucleus increases, the number of neutrons required for a stable nucleus increases even faster. If there are too many protons (or too few neutrons) in the nucleus, the forces will be unbalanced and the nucleus will become unstable.

Strong nuclear forces are sometimes simply called strong forces or strong interactions. This force is strong enough to overcome the repulsive force between her two positively charged protons, allowing protons and neutrons to stick together in an unimaginably small space.

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When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond nitrogen lone bond.

Strong intermolecular interactions known as hydrogen bonds can develop between adjacent molecules. Between the covalently bound hydrogen atom of one molecule and the electron lone pair of a second molecule, hydrogen bonds are created.

Due to their strong electronegativity, only nitrogen, oxygen, or fluorine atoms may be used in this process. These three atoms have extremely high electronegativity, which makes it simple for them to draw the electron from the hydrogen atom and establish hydrogen bonds.

Atoms within a molecule are held together by intramolecular forces. There are forces between molecules known as intermolecular forces.

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At standard temperature and pressure, the number of gaseous molecules that the flask contains is equal to 1.2098 × 10^23.

According to the given data, the volume of the flask is equal to 4.50 L.

As the volume occupied by one mole of any gas at standard temperature and pressure is 22.4 liters, therefore the number of moles in the flask can be calculated as follows;

n = 4.5 ÷ 22.4

n = 0.2009

As one mole is equal to 6.02 × 10^23 units

The number of gaseous molecules in the flask can be calculated as follows;

0.2009 × ( 6.02 × 10^23 ) = 1.2098 × 10^23

Hence, the number of gaseous molecules in the flask is calculated to be 1.2098 × 10^23.

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It is the 400 nm photon that has the greater energy by a factor of 1.77.

We know that the wavelength has to do with the horizontal distance that is covered by a wave. We know that the longer the distance that is covered then the weaker the wave. In other words, the wavelength of the wave is inversely proportional to the to the energy of the wave. The greater the wavelength, the lesser the energy.

Let us now find the energy of each of the wavelengths;

E = hc/λ

E = energy of the light

h = Plank's constant

c = speed of light

λ = wavelength

For the  700 nm photon;

E = 6.6 * 10^-34 * 3 * 10^8/ 700 * 10^-9

E = 2.8 * 10^-19 J

For the 400 nm photon;

E = 6.6 * 10^-34 * 3 * 10^8/ 400 * 10^-9

E=  4.95 * 10^-19 J

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If the rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1 then order of the reaction with respect to this reactant is  1/3

Rate of reaction is the speed at which a chemical reaction proceeds

Here given data is

Rate of reaction = 9.6

Concentration of reactant  = 3.1

We have to calculate order of the reaction = ?

So we can write

R = K[C]ⁿ

Where R is the reaction rate and K is a constant

Here C is the concentration of the reactant

rate of reaction increases by a factor of 9.6 when the concentration of reactant increases by a factor of 3.1 then

9.6 = K× [3.1]ⁿ

Dividing this equation we get

1/9.6 = 1/3.1ⁿ

3n = 1

n = 1/3

Then the order of the reaction with respect to this reactant is 1/3

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Aufbau states that you must fill the lowest energy orbital 3d before 4s but we fill 4s before 3d because 3d orbitals have slightly more energy than 4s orbitals.

In atomic theory and quantum mechanics, an atomic orbital is a feature describing the location and wave-like conduct of an electron in an atom. This feature may be used to calculate the possibility of locating any electron of an atom in any specific location across the atom's nucleus.

An atomic orbital is a mathematical term in atomic concept and quantum mechanics that describes the location and wavelike behavior of an electron in an atom. Most of the electrons, each with its own spin quantum quantity s, will occupy every one of these orbitals.

Orbital holds electrons that range in an asset called spin. Orbital: A area of space within an atom in which an electron in a given subshell can be found. Any orbital can preserve most of the 2 electrons with contrary spin. the primary shell has one 1s orbital and holds 2 electrons.

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The mass of an atom of chlorine 37 is heavier than the mass of an atom of chlorine 35.

The mass number of atoms is the sum of the protons and neutrons in the nuclei of atoms.

Mathematically:

Mass number = number of protons + number of neutrons

The protons are the positively charged particles located in the nuclei of atoms while the neutrons are neutrally charged particles found in the nuclei of atoms as well.

Both proton and neutron numbers determine how heavy an atom would be. Electrons of atoms are usually located outside the nuclei and contribute a negligible amount to the weight of atoms.

Thus, a chlorine atom with an atomic mass of 37 is heavier than a chlorine atom with a mass of 35.

Although both atoms are from the same elements, they are called isotopes. Isotopes of the same element have the same proton number but different mass numbers.

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Answer:

Cutting hair is a physical change since it doesn't change the substance its still hair

bending a paper clips since it's also the same substance

Ice cube melting

Explanation:

All of these are physical change since there reversible and they all still stay the same substance

The value of R from the ideal gas equation is 0.082 atm.L/K/mol.

The ideal gas equation is the equation that shows the relationship between pressure, and volume. moles of a gas and the temperature of a gas under ideal conditions.

The ideal gas equation is given below as follows:

PV = nRT

At standard temperature and pressure, the values of the variables are given below;

Pressure, P = 1 atm

Volume, V = 22.4 Liters

Number of moles, n = 1 mole

Temperature, T = 273.15 K

R = PV/nT

R = 1 * 22.4 / (273.15 * 1)

R = 0.082 atm.L/K/mol

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Water molecules slide around each other, results in making and breaking of hydrogen bonds. As energy is added, molecules move rapidly that they spread in all directions. This phase-change process is called vaporization.

The temperature of liquid water increases as it is heated up until it reaches 100°C. Water that was in  liquid state turns into vapors at this point. This  transition of a liquid into a gas is referred to as Vaporization. The water molecules absorb heat energy. As a result, the particles move more quickly as they gain extra energy until they possess sufficient energy to break free of the liquid molecules to vapors. There are two types of vaporization. 1. Boiling that occurs below the surface of a liquid. The boiling point of a liquid is the temperature at which it begins to boil. Water has a boiling point of 100 °C. 2. Evaporation that take place at the surface of the liquid. Some of the molecules that move  faster are able to overcome the forces of attraction of other molecules and escape from the water's surface.

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Electrons and proton are a type of subatomic particle with a negative and positive charge. Protons are held together in the atom's nucleus by the nuclear force. A subatomic particle without charge is the neutron.

The electron, the smallest constituent part of an atom, has a negative charge. Protons and electrons are present in an atom in a neutral state in an equal number. One electron and one proton are all that the hydrogen ion has. On the other hand, the atomic nucleus possesses 92 protons, that means 92 electrons.

Electrons are present outside of the atom's nucleus, in contrast to neutrons and protons that are contained inside the nucleus at its center. Negative electrons are drawn to the positively charged nucleus so because electric charges of opposite sign attract one another.

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Answer:

Explanation:

The mass of the bone sample can be found by using the formula

mass = density × volume

From the question

density = 1200mg/cm^3

volume = 39.5cm^3

We have....

mass = 1200 × 39.5 = 47400

We have the final answer as

Hope this helps you

West to east direction the Sun appear to move across the sky.

The correct option is West to east.

The Sun, Moon, planets, and stars all rise in the east and travel westward across the sky because Earth rotates or spins in an eastward direction.

Start by pointing your left arm in the direction of the sun in the morning to get a sense of where north, south, east, and west are. Caitlin Dempsey is pictured. Now extend your right hand in the direction of the west. Your back is to the north and you are now looking south.

The four principal compass directions are known as the four cardinal directions, or cardinal points. They are north, east, south, and west, and are typically represented by the initials N, E, S, and W, respectively.

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Answer:

Elements

Explanation:

I'll assume that the correct element symbol is Cl, not CL.  CL would mean a compound made up of one carbon (C) and one Unknown element (L),  Cl means chlorine.

I aslo wonder if the compound is [tex]Cl_{2}[/tex] and not [tex]Cl_{3}[/tex].  Regardless, both would be elements.  A compound is made up of 2 or more different elements.  A mixture is 2 or more compounds.

Answer: 3.6 ml

Hope this helps!

Balanced chemical equation :

A balanced equation is a chemical reaction equation in which the total charge and the number of atoms for each element in the reaction are the same for both the reactants and the products.

Given Equation :

[tex]2NaOH_{}[/tex]  + [tex]CO_{2}[/tex] = [tex]Na_{2}CO_{3}[/tex]  + [tex]H_{2}O[/tex]

Here, we have 2 sodium (Na) atoms, 4 Oxygen (O) atoms, 2 Hydrogen (H) atoms and 1 Carbon (C) atom on the left hand side of the equation (reactants).

Also we have 2 sodium (Na) atoms, 4 Oxygen (O) atoms, 2 Hydrogen (H) atoms and 1 Carbon (C) atom on the right hand side of the equation (products).

Hence , the given equation, [tex]2NaOH_{}[/tex]  + [tex]CO_{2}[/tex] = [tex]Na_{2}CO_{3}[/tex]  + [tex]H_{2}O[/tex] is a balanced chemical equation.

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Acid - base pairs.

Arrhenius theory, says, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH−).

It is now known that the hydrogen ion cannot exist alone in water solution; rather, it exists in a combined state with a water molecule, as the hydronium ion (H3O+). In practice the hydronium ion is still customarily referred to as the hydrogen ion.

----------------------------------------------------------------------------------------------------------------

a) HClO3 + H2O <=> H3O + + ClO3-

HClO3 is the acid, ClO3- is the base (acid-base pair)

H2O acepts that H+ from the HClO3, and becomes H3O+

H2O is a base, H3O+ is the acid (acid-base pair)

----------------------------------------------------------------------------------------------------------------

b) HSeO4 - + NH3 <=> NH4 + + SeO4 2-

Here HSeO4 - can free one H so it would be the acid, and SeO4 2- is the base.

NH3 receives H+ from acid, so it is the base, and NH4+ is the acid.

---------------------------------------------------------------------------------------------------------------

c) HCO3- + OH - <=> CO3 2- + H2O

HCO3- gives away one H, so it is the acid, and CO3 2- is the base

(HCO3-,CO3 2-) acid-base pair.

OH- receives the H+ and becomes H2O. OH- is the base and H2O acid.

H2O can be acid and base, remember that. In this case it is the acid.

---------------------------------------------------------------------------------------------------------------

d) C5H5NH + + H2O <=> C5H5N- + H3O+

C5H5NH has the H, but on the right it doesn't, so it would be th acid. C5H5N- is the base.

H2O here is a base, because it receives the H+, and becomes H3O+ (the acid).

---------------------------------------------------------------------------------------------------------------

The final volume of the gas is 9L

Volume is the space occupied within the boundaries of an object in three dimensional space

Ideal gas equation establishes a relation between pressures, volumes, and temperatures of different conditions

Using the ideal gas equation

PV = nRT .....1

Ideal gas equation for initial condition will be:

PV = nRT......2

Ideal-Gas Equation for final conditions will be:

(P/3)X = nR(T/2)

On dividing equation 1 and 2

PV = nRT / (P/3)X = nR(T/2)

3V/X = 2

X = 3V/2

Putting the value of V = 6L

X =  3(6L)/2 = 9L

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If we assume that helium acts as an ideal gas, we can calculate that 1.000 mol of it will take up 3.43 L, which is 6.53 times less than its volume at standard conditions.

Assuming that helium behaves like an ideal gas in both cases, we can calculate the volume at 2.20 K using the ideal gas equation:

PV = nRT

P - the pressure exerted by the gas (0.05256 atm)

V - the volume of the gas

n - number of moles of the gas (1.000 mol)

R - universal gas constant (0.08206 L*atm/K*mol)

T - temperature (2.20 K)

If we rearrange the equation, we get:

V = nRT/P

Now we plug in the known values:

V = 1.000 mol * 0.08206 L*atm/K*mol * 2.20 K / 0.05256 atm

V = 3.43 L

At standard conditions (273 K, 1 atm), 1 mol of an ideal gas has a volume of 22.4 L, so the volume at described conditions is 22.4 L / 3.43 L = 6.53 times smaller than at standard conditions.

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