Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the maximum mass of precipitate that can form is 26.31g.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Pb(NO[tex]_3[/tex])[tex]_2[/tex](aq) + Na[tex]_2[/tex]S(aq) —> PbS(s) + 2 NaNO[tex]_3[/tex](aq)
mole of sodium sulfide =8.65/78.05
=0.11moles
the mole ratio between Na[tex]_2[/tex]S and PbS is 1:1
moles of PbS= 0.11moles
mass of PbS= 0.11moles × 239.2g/mol
=26.31g
Therefore, the maximum mass of precipitate that can form is 26.31g.
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QUIZ 1: GOLDEN YEARS TO MASTERS The man responsible for discovering that the atom is mostly space is:
The man responsible for discovering that the atom is mostly space is Ernest Rutherford, who is often referred to as the "father of nuclear physics".
Rutherford developed the Rutherford Model of the Atom, which proposed that the atom consists of a small, dense, positively-charged nucleus, surrounded by a much larger, diffuse, negatively-charged region, filled mostly with empty space. This model was later refined and became the basis of modern atomic theory.
Ernest Rutherford is credited with discovering that the atom is mostly space. He proposed the Rutherford Model of the Atom, which states that the atom is composed of a small, dense, positively-charged nucleus surrounded by a much larger, diffuse, negatively-charged region which is mostly empty space.
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in the following reaction, ni2+ is acting as a(n) ________. ni2+ (g) + 6h2o (l) → ni(h2o)62+ (aq)? A. oxidizing agent B. Lewis acid C.precipitating D.agent solvent E.ligand
In the given reaction Ni2+ is acting as an oxidizing agent so option A is the correct answer.
An oxidizing agent is a species that oxidizes another species by taking electrons from it. In this reaction, Ni2+ is accepting electrons from H2O molecules, resulting in the formation of Ni(H2O)62+ and 6H+ ions. Oxidation reactions are essential in many biological processes, such as respiration, photosynthesis, and the metabolic pathways that generate energy.
Oxidizing agents can also be used in industrial processes, such as in the production of bleach, dyes, and detergents. In this reaction, Ni2+ is oxidized, which means that it is acting as the oxidizing agent.
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What is the O-Xe-O bond angle in XeO3? O 109.5° O 90° O 120°O 180°O 60°
The O-Xe-O bond angle in XeO3 is approximately 109.5 degrees. This is due to the fact that the xenon atom is in the highest oxidation state.
In the molecule XeO3, also known as xenon trioxide, there are three oxygen atoms bonded to a single xenon atom. The O-Xe-O bond angle refers to the bond angle formed by the three oxygen atoms as they are bonded to the xenon atom. The bond angle is approximately 109.5 degrees, which is considered a "bent" or "angular" shape. This is due to the fact that the xenon atom is in the highest oxidation state of +8 and it has a high electron XeO3 density due to its large atomic size, this makes the O-Xe-O bond angle smaller than the ideal bond angle of a tetrahedral shape. The XeO3 molecule is polar due to the difference in electronegativity between Xenon and Oxygen atoms.
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use of molar concentrations to calculate ph what is the ph of a solution that contains 0.20 m sodium acetate and 0.60 m acetic acid (pka 5 4.76)?
The pH of the solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([salt]/[acid])
pH = 4.76 + log(0.20/0.60)
pH = 4.17
What is solution?In such a mixture, a solute is a substance dissolved in another substance, known as the solvent. The concentration of a solute in a solution is the mass of that solute expressed as a percentage of the mass of the whole solution. Often, the solubility in water is expressed in gram/100 mL. A solution is a homogeneous mixture of two or more substances. The particles of solute in a solution cannt be seen by the nake d eye. When the solvent is water, the word hydration, rather than solvation, is used.
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Specific step by step plan for what to do during an earthquake while at home and at school
To solve this we must be knowing each and every concept related to earthquake. Therefore, step by step plan for what to do during an earthquake while at home and at school is given as below.
What is earthquake?An earthquakes (also known as just a quake, tremor, or temblor) is indeed the shaking of the Earth's surface caused by a rapid energy release in the Earth's lithosphere, which produces seismic waves.
What to do in the event of an earthquake:
During an earthquake, be as safe as possible.
Be aware that certain earthquakes are foreshocks, and that a greater earthquake may occur. Reduce your motions.
If you are indoors, drop on the ground, seek refuge behind a sturdy table or even other piece of furniture, and hold until the shaking stops.
Therefore, step by step plan for what to do during an earthquake while at home and at school is given as above.
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How many Atoms are in 3.5 grams of silicon
What are the most important things you have learned in this unit about how the trillions of cells in the human body
get what they need to function, and what they do with the things they absorb?
Trillions of cells make up the human body. They support the body's structure, absorb nutrients from food, convert those nutrients into energy, and perform specialized functions. Cells also contain the body's genetic material and can replicate themselves.
What is cell ?All living organisms and body tissues are made up of the smallest unit that can live on its own. A cell is made up of three major components: the cell membrane, the nucleus, and the cytoplasm. The cell membrane surrounds the cell and regulates the substances that enter and exit the cell.
Cell Biology is the study of cells, from their basic structure to the functions of each cell organelle. Cells were discovered for the first time by Robert Hooke, the first biologist. Cells are the building blocks of all organisms. They can be made up of a single cell (unicellular) or many cells (bicellular) (multicellular).
Thus, Cells also contain the body's genetic material and can replicate themselves.
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The force of gravity between the Sun and Jupiter is 4 x 1023 N. If the mass of the Sun is 2 x 1030 kg and the sun and Jupiter are 7 x 10 m apart, what is
the mass of Jupiter?
To solve this, we must be knowing each and every concept behind fundamental force. Therefore, 18.33 × 10²⁶ kg is the mass of Jupiter.
What is fundamental force?Nature is governed by four fundamental or universal forces. All stuff in the universe would disintegrate in the absence of these forces. Any pull or push that causes an item to change its physical condition is referred to as force (in terms of motion or deformity).
Mathematically,
F = G × m₁ × m₂ / r²
G=universal gravitational constant =6.67 × 10⁻¹¹ N m²
m₂ = r² × F / G × m₁
m₂ = { ( 7.8 x 10¹¹ )² × ( 4 × 10²³ ) } / { ( 6.67 × 10⁻¹¹ ) × ( 2 x 10³⁰ ) }
m₂ = ( 60.84 × 10²² × 4 × 10²³) / ( 13.27 × 10¹⁹ )
m₂ = 18.33 × 10²⁶ kg
Therefore, 18.33 × 10²⁶ kg is the mass of Jupiter.
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The uncertainty in the measurement 80.2 g is
a) +/- 0.1g b) +/- 1g
c) +/- 0.01 g
d) +/- 10g
Answer: a) +/- 0.1g
Explanation:
What is the frequency of a
green light with a wavelength
of 520 nm?
[?] × 10
Hz
c = 3.0 x 108 m/s
Hint: Watch your units!
Be sure to enter both the coefficient and the exponent.
Coefficient (green)
Exponent (yellow)
5.77 ×10^14 is the green photon's frequency.
how and why is the amount of light a controlled variable
Explanation:
Why:
Because if the temperature is held constant during an experiment, it is controlled. Some other examples of controlled variables could be the amount of light or constant humidity or duration of an experiment etc.
How:
The light intensity (how close the light is). Dependant variable - the number of oxygen bubbles given off (the rate of photosynthesis). Controlled variables - the size of the pondweed, the volume of water used and its temperature.
a(n) ________ digests terminal peptide bonds to release amino acids.
An exopeptidase digests terminal peptide bonds to release amino acids. The exopeptidase cleave the terminal amino acid at the end of the peptide.
The exopeptidase cleave the terminal amino acid at the end of the peptide. The aminopeptidase is exopeptidase that will remove the amino acids at the terminal amino at the end of the peptide bond. An exopeptidase is the peptidase that cleave the terminal peptide bond.
The amino acids are the organic compounds that contains the both functional group , the amino and the carboxylic functional group. The formula for the amino acids is given as :
R
|
H₂N - C - COOH
|
H
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A. Calculate the pH of a 0.10 M solution of barium hydroxide, Ba(OH)2.
B. Calculate the pH of a 0.10 M solution of NaOH.
C. Calculate the pH of a 0.10 M solution of hydrazine, N2H4. Kb for hydrazine is 1.3
A. The pH of a 0.10 M solution of barium hydroxide is 13.3.
B. The pH of a 0.10 M solution of NaOH is 13.
C. The pH of a 0.10 M solution of hydrazine, N2H4 is 10.56.
Why is pH a relevant concept?a metric for determining how basic or acidic a substance or solution is. The pH scale ranges from 0 to 14. A pH value of 7 is considered neutral on this scale, meaning it is neither acidic nor basic. It is more acidic if the pH value is below 7, and more basic if the pH value is above 7.
A. 1 mole of Ba(OH)_2 gives 2 moles of OH^- ions
The concentration of OH^- ions = 2×0.10 M
The concentration of OH^- ions = 0.20 M
pOH = [tex]-log[OH^-][/tex]
pOH = [tex]-log[0.20][/tex]
pOH = 0.699
Now, we calculate pH value,
pH = 14 - pOH
pH = 14 - 0.699
pH = 13.3
B. 1 mole of NaOH gives 1 moles of OH^- ions
The concentration of OH^- ions = 0.10 M
pOH = [tex]-log[0.10][/tex]
pOH = 1
Now, we calculate pH value,
pH =14 - pOH
pH = 14 - 1
pH = 13
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manatees can’t tolerate water colder than what temperature?
Manatees can’t tolerate water colder than 68 Fahrenheit temperature.
Those spending the winter in Florida are always vulnerable to the cold because they are at the periphery of their habitat. Manatees have discovered a workable alternative on the other side of Tampa Bay: Hundreds congregate in a canal warmed by water released from a Tampa Electric Co. power station. They may float in water that is about 78 degrees temperature there to get away from the cold.
Manatee corpses that were unable to reach a warm water sanctuary have started showing up every day. The lab has been extremely busy lately, occasionally studying a dozen manatees per day. Dr. Martine de Wit ascertained the cause of death there. Cold weather often causes the most stress in young manatees, but right now, full-grown adults are passing away.
Their internal processes are turned off by the cold water. Others drowned because they were unable to breathe, and many were unable to eat.
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MgCO3(aq)+HCl(aq)?MgCl2(aq)+H2O(l)+CO2(g)
Balance each of the following chemical equations. Give your answer as coefficients separated by commas
MgCO₃ (s) + 2HCl (aq) → MgCl₂ (aq) + H₂O (l) + CO₂ (g) is the balanced chemical equation.
A balanced chemical equation is an equation where the number of atoms of each type in the reaction is same on both the sides of the reactant and the product. Law of conservation of mass is determined as the law for balancing a chemical equation.
MgCO₃ (s) + 2HCl (aq) → MgCl₂ (aq) + H₂O (l) + CO₂ (g)
This is an acid-base neutralization. In this reaction MgCO₃ is a base and HCl is an acid. MgCO₃ and HCl are the reactants. The products are MgCl₂, H₂O and CO₂. Co₂ is a colorless odorless and compressed liquefied gas.
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A sample of argon gas occupies 105 ml at 0. 871 atm. If the temperature remains constant, what is the volume (in l) at 26. 3 kpa?.
To solve this problem, you can use the ideal gas law, which states:
PV = nRT
where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature of the gas in kelvins.
Since the temperature of the gas remains constant, we can rearrange the ideal gas law to solve for the volume at the new pressure:
V = (nRT) / P
Plugging in the given values, we have:
V = (nRT) / P
= (n * 8.3145 * 273.15) / 26.3
= (n * 22.4) / 26.3
We know that the volume of the gas is 105 ml, so we can set up the following equation to solve for n, the number of moles of gas:
105 ml * 26.3 / 22.4 = n
Solving for n, we find that the number of moles of gas is 0.0141 moles. Now we can plug this value back into the ideal gas law to solve for the volume of the gas at the new pressure:
V = (0.0141 moles * 8.3145 * 273.15) / 26.3
= 22.4 / 26.3 * 0.0141 moles
= 0.0112 moles
This is equivalent to 112 ml. Since 1 litre is equal to 1000 ml, the volume of the gas in litres is 112 ml / 1000 ml/litre = 0.112 litres.\
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Identify the molecule with the strongest intermolecular force. H 2o chcl 3 c 6h 6 of 2.
Base on molecule given that is H₂O , CHCl₃, C₆C₆ and OF₂. The strongest intermolecular force is H₂O molecule.
How strong are H₂O , CHCl₃, C₆C₆ and OF₂ intermolecular force?C₆C₆ or Benzene is determine a non polar molecule where the bonded with weak london dispersion forces.CHCl₃ or Trichloro methane is determine as a polar molecule where the bonded with weak dipole dipole interactions.OF₂ or Oxygen difluoride is determine as a polar molecule but the polarities direction has opposite direction that make them cancel out each other. Their bond are weak because of london dispersion forces.H₂O or Water is determine as a polar molecule where the bond is strong in hydrogen bonding.Learn more about intermolecular force here
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What is a software function? name a function that could relate to software found in an airplane.
A software function is a specific set of instructions that a computer can execute to perform a specific task.
An example of a software function related to an airplane is a flight control system that enables the automatic guidance of the aircraft.
This system consists of algorithms that enable the aircraft to follow a predetermined flight path, receive instructions from air traffic control, and respond to changes in air traffic conditions.
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Software can be described as a set of instructions, or programs used to operate computers and execute particular tasks. The software used in the airplane is the flight control system.
What is software?The software can be described as a set of computer programs or instructions and associated documentation and data. Hardware is built and actually performs the work of the system.
The lowest programming, level consists of machine language instructions supported by an individual processor. A machine language posses of groups of binary values signifying instructions that change the states of the computer.
For example, an instruction can changes the value stored in a specific storage location in the computer. An instruction can also invoke one of many input or output operations, causing state changes that should be visible to the user.
The flight control system can enable the automatic guidance of the airplane.
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Would a 1.0×10−8 M solution of HCl have pH < 7, pH=7, or pH > 7?
pH < 7pH = 7pH > 7
A 1.0 × 10⁻⁸ M solution of the HCl have the pH < 7. The value of the pH for HCl is pH = 6.99.
The concentration of the HCl = 1.0 × 10⁻⁸ M
Total [H⁺] = [H⁺] HCl + [H⁺] water
The HCl is the strong acid , so it completely ionizes.
[H⁺] H₂O = X
Total [H⁺] = X + 1.0 × 10⁻⁸
[H⁺] [OH⁻] = 1 × 10⁻¹⁴
X₂ + 10⁻⁸X - 10⁻¹⁴ = 0
X = 9.5 × 10⁻⁸
Total [H⁺] = 9.5 × 10⁻⁸ + 1.0 × 10⁻⁸
= 1.05 × 10⁻⁷
pH = - log [H⁺]
pH = - log [1.05 × 10⁻⁷]
pH = 6.99.
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What is the structure of 1-cyclopropyl-3-methylcyclopentane?
Answer:
IUPAC NAME
1-cyclopropyl-3-methylecyclopentsne
CHEMICAL FORMULA
C9H16
1.0 x 10-10 moles of HCl are added to 1.0 L of pure H2O. What is the pH? A) 10.0B) 8.0C) 1.0D) 0.0E) none of these
Answer:
A. 10
Explanation:
Find its molarityM = n : v (L)
M = 1 × 10^-10 : 1
M = 10^-10
Ionize the HCl compoundHCl => H^+ + Cl^-
then, the a = 1 ( The amount of Hydrogen ions released during the ionization process)
Find the value of [H^+][H^+] = a × Ma
[H^+] = 1 × 10^-10
[H^+] = 10^-10
Find the pHpH = -log [H^+]
pH = -log 10^-10
pH = -(-10 × 1)
pH = 10
Well, the pH is 10.
in developed countries, the two most deadly sources of indoor pollution are ________.
A) radiation from electronic equipment and pesticides
B) synthetic furniture materials and radiation from electronic equipment
C) radon and cigarette smoke
D) pesticides and cleaning agents
E) pesticides and cigarette smoke
Radon and cigarette smoke are the two most deadly sources of indoor pollution in developed countries.
Through foundational gaps, radon can flow into homes, schools, and other buildings. Lung cancer can develop from inhaling it over time. Smokers who are exposed to radon have a higher risk of lung cancer than non-smokers do. find out more about radon in residences, buildings, and schools.
The second most common cause of lung cancer is radon exposure, and smokers are at much higher risk than nonsmokers. Smokers account for more than 85% of lung cancer deaths from radon exposure.
According to EPA estimates, radon is the leading cause of lung cancer among non-smokers. Radon ranks as the second most common cause of lung cancer overall.
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100 POINTS, PLEASE I NEED THIS TO PASS MY CLASS NO TROLLS.
A chemical equation is shown below.
KNO3 → KNO2 + O2
What are the coefficients that should be added to balance this equation? Use complete sentences to explain your answer.
Explain how this chemical reaction demonstrates the conservation of mass.
Answer: only for the equation.
2KNO3->2KNO2+O2
Explanation:
1. What is the molecular geometry of IBr3? a. Trigonal Bipyramidal b. Tetrahedral c. T-Shape d. Seesaw 2. What is the electron pair geometry of xenon tetrachloride? a. Octahedral b. Square Planar c. Tetrahedral d. Square Pyramidal 3. What is the hybridization of NH3 (Ammonia)? a. sp2 b. sp3 c. sp3d d. sp3d2
IBr3 has a triangular bipyramidal molecular shape. The electron pair form of xenon tetrachloride is also octahedral. Sp2 is produced when NH3 hybridizes (Ammonia).
The molecular geometry of a molecule refers to the three-dimensional arrangement of its atoms. It also offers the general shape of the molecule, along with bond lengths, bond angles, torsional angles, and any other geometrical properties that control the position of each atom. The chemical compound xenon tetrachloride (XeCl 4) belongs to the nonpolar chemical family. The xenon and chlorine bond angles are 90 degrees on the molecule of xenon tetrachloride (with square planar molecular geometry). IBr3 has a triangular bipyramidal molecular shape. The electron pair form of xenon tetrachloride is also octahedral.
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Calculate the density of a piece of bone with a mass of 3.8 grams and a volume of 2.0 cubic centimeters. a. 0.53 cm b. 3/g b. 7.6 g/cm 3 d.1.9 g/cm 3
The density of that piece of bone is (d) 1.9 g/cm³. You can determine bone density by divide the mass with the volume.
How to calculate bone density?Bone density is the weight of the bone per volume. Bone density calculation commonly use to determine someone health by comparing the normal bone density that health person have with the test subject bone density value. Bone density formula is determine as follow:
Bone density = mass : volume
As per given, the mass = 3.8 grams and bone volume is = 2.0 cubic centimeters = 2.0 cm³. The value of bone density will be:
Bone density = mass : volume
Bone density = [tex]\frac{3.8}{2.0}[/tex]
Bone density = 1.9 g/cm³
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Why are noble gases not part of the electronegativity trend?
Answer:
Because most noble gases do not form compounds, they do not have electronegativities.
Consider an electron in the state n=4n=4, l=3l=3, m=2m=2, s=1/2s=1/2.
1)In what shell is this electron located?
2)In what subshell is this electron located?
3)How many other electrons could occupy the same subshell as this electron?
.4)What is the orbital angular momentum LL of this electron? Express your answer in units of ℏ.
5)What is the z component of the orbital angular momentum of this electron, LzLz Express your answer in units of ℏ.
6)
What is the z component of the spin angular momentum of this electron, SzSz Express your answer in units of ℏ.
Answer:
This electron is located in the fourth shell.This electron is located in the l=3 subshell, also known as the p subshell.There could be six other electrons occupying the same subshell as this electron.The orbital angular momentum of this electron is LL = √(l(l+1))ℏ = √(3(3+1))ℏ = √12ℏ = 2ℏ.The z component of the orbital angular momentum of this electron is Lz = mℏ = 2ℏ.The z component of the spin angular momentum of this electron is Sz = m_sℏ = (1/2)ℏ = 1/2ℏ.Explanation:
In quantum mechanics, an electron is described by four quantum numbers: n, l, m, and s. The first quantum number, n, is known as the principal quantum number and determines the energy level or shell in which the electron is located. In this case, the electron is in the n=4 shell.The second quantum number, l, is known as the angular momentum quantum number and determines the subshell in which the electron is located. The possible values of l are 0, 1, 2, ..., n-1, where n is the principal quantum number. In this case, the electron is in the l=3 subshell, which is also known as the p subshell.The Pauli exclusion principle states that no two electrons in an atom can have the same set of quantum numbers. Therefore, the maximum number of electrons that can occupy a given subshell is determined by the number of distinct combinations of the remaining quantum numbers, m and s. For a given value of l, there are 2l+1 possible values of m, and two possible values of s (±1/2). Therefore, the maximum number of electrons that can occupy a subshell with l=3 is 2(3+1) = 6. The orbital angular momentum of an electron is given by the formula LL = √(l(l+1))ℏ, where l is the angular momentum quantum number and ℏ is the reduced Planck constant. In this case, the electron has l=3, so its orbital angular momentum is LL = √(3(3+1))ℏ = √12ℏ = 2ℏ.The z component of the orbital angular momentum, Lz, is given by the formula Lz = mℏ, where m is the magnetic quantum number. In this case, the electron has m=2, so its z component of orbital angular momentum is Lz = 2ℏ.The spin angular momentum of an electron is given by the formula Sz = m_sℏ, where m_s is the spin quantum number. In this case, the electron has m_s=1/2, so its spin angular momentum is Sz = (1/2)ℏ = 1/2ℏ.What equation correctly represents the chemical reaction that forms ammonia?
The balanced chemical equation for the formation of ammonia gas by the reaction between nitrogen gas an hydrogen gas is N2+3H→2NH3
What is ammonia?Ammonia can be defined as inorganic compound of nitrogen and hydrogen with the formula NH₃. A stable binary hydride and the simplest pnictogen hydride ammonia is a colourless gas with a distinct pungent smell.
Therefore about 80% of the ammonia produced by industry is used in agriculture as fertilizer. Ammonia is also used as a refrigerant gas for purification of water supplies and in the manufacture of plastics, explosives, textiles, pesticides, dyes and other chemicals.
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Which has the highest Zeff for its valence electrons?
a. Li
b. F
c. C
d. Na
Answer:
Na(sodium cation) has the highest zeff for its valence electrons.
The effective nuclear charge (Zeff) refers to the net positive charge experienced by the valence electrons in an atom, taking into account the shielding effect of inner electrons. Among the options provided, fluorine (F) has the highest Zeff for its valence electrons.
The higher the Zeff, the stronger the attraction between the valence electrons and the nucleus.
Fluorine has the highest Zeff because it has the highest atomic number among the given elements. As we move across a period in the periodic table from left to right, the atomic number increases, resulting in an increase in the number of protons in the nucleus. This higher positive charge increases the effective nuclear charge experienced by the valence electrons, leading to a stronger attraction between the nucleus and the valence electrons.
Therefore, among the options provided, fluorine (F) has the highest Zeff for its valence electrons.
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the formal charge on nitrogen in no3- is ________, where the lewis structure of the ion is:
the number of associated electrons from the number of valence electrons. For nitrogen, the formal charge is 5 - 5 = 0. For each oxygen atom, the formal charge is 6- 6 = 0.Therefore, the formal charge on nitrogen in NO3- is 0.
The formal charge on nitrogen in NO3- is 0, where the Lewis structure of the ion is:
N O
| |
O- O
| |
O O
1. Count the total number of valence electrons for the molecule. In this case, there is 1 nitrogen atom and 3 oxygen atoms, so the total number of valence electrons is 8 + 6*3 = 26.
2. Assign the electrons to the atoms according to the octet rule. Nitrogen has 5 valence electrons, so assign 5 electrons to it. Oxygen has 6 valence electrons, so assign 6 electrons to each of the oxygen atoms.
3. Count the number of electrons that are associated with each atom. Nitrogen has 5 electrons associated with it, and each oxygen atom has 6 electrons associated with it.
4. Calculate the formal charge for each atom by subtracting the number of associated electrons from the number of valence electrons. For nitrogen, the formal charge is 5 - 5 = 0. For each oxygen atom, the formal charge is 6- 6 = 0.
Therefore, the formal charge on nitrogen in NO3- is 0.
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