pH plus pOH equals 14. POH equals -log[OH-]. The pOH is a measure of a solution's basicity, whereas the pH is a measure of a solution's acidity.
The pOH equation is what How can pH be used to calculate pOH?The concentration of hydrogen ions in a solution is gauged by its pH value. The concentration of hydroxide ions in a solution is determined by its pOH value. The formula pH + pOH = 14 relates the pH and pOH.
What is the pOH formula?You must know the hydroxide ion concentration in moles per liter to calculate the pOH of a solution. The following expression is used to calculate the pOH: pOH equals -log [OH-].
Calculation:pH of oranges 3.5
pH of rainwater 6.2
pH of milk of magnesia 10.5
pH + pOH = 14
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Calculating partial pressure in a gas mixture A 6.00 L tank at 25.4 °C is filled with 8.90 g of carbon monoxide gas and 3.63 g of chlorine pentafluoride gas. You can assume both gases behave as ideal gases under these conditions. Calculate the mole fraction and partial pressure of each gas, and the total pressure in the tank. Be sure your answers have the correct number of significant digits.
Mole fraction: carbon monoxide partial pressure atm mole fraction chlorine pentafluoride partial pressure atm Total pressure in tank: atm
According to the given statement Partial pressure CO: 2.56 atm, Mole fraction ClF₅: 0.0383 and Partial pressure ClF₅: 0.11 atm.
What is the purpose of monoxide?Hydrogen, electrocatalysts, pure metals, anhydrides, formic, methyl formate, N,N-dimethylformamide, benzoic acid, and as a reduction agent in coke ovens are all produced using carbon monoxide.
Briefing:
We should apply the Ideal Gases Law to solve this:
P . V = n . R . T
We need n, which is the total moles for the mixture
Total moles = Moles of CO + Moles of ClF₅
Moles of CO = mass of CO / molar mass CO → 8.9 g/28 g/mol = 0.317 mol
Moles of ClF₅ = mass of ClF₅ / molar mass ClF₅ → 3.63g/ 130.45 g/m = 0.0278 mol
0.317 mol + 0.0278 mol → 0.398 moles in the mixture
So we have the total moles so with the formula we would know the total pressure.
P . 6L = 0.724 mol . 0.082L.atm/mol.K . 292.2K
P = ( 0.724 mol . 0.082L.atm/mol.K . 292.2K) / 6L
P = 2.89 atm
Mole fraction is defined as the quotient between the moles of gas over total moles, and it is equal to partial pressure of that gas over total pressure
Partial pressure for gas X/Total pressures = Moles of gases X/Total mole
(Moles of gas X / Total moles) . Total pressure = Partial pressure of gas X
Mole fraction CO = 0.317 / 0.724 = 0.437
Partial pressure CO = 0.88 . 2.89 atm → 2.56 atm
Mole fraction ClF₅ = 0.0278 / 0.724 = 0.0383
Partial pressure ClF₅ = 0.0383 . 2.89 atm → 0.110 atm
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What is the significance of the half-life of a radioisotope?
A. It tells how long a radioisotope sample is considered dangerous.
B. It tells what kind of radioactivity is released through radioactive
decay.
C. It tells how much energy is released over the lifetime of a
radioactive sample.
D. It tells what fraction of a radioactive sample remains after a
certain length of time.
Answer:
D) It tells what fraction of a radioactive sample remains after acertain length of time.
Explanation:
write the formula for compounds formed from these pairs of ions. a) nh4 , so32- b) calcium ion, phosphate ion
The compound that is formed from the combination of NH₄⁺ and SO₃²⁻ is (NH₄)₂SO₃ and the compound that is formed from the combination calcium ion and phosphate ion is Ca₃(PO₄)₂.
Definition of Ionic bond
A bond that is formed by the complete transfer of some electrons from one atom to another is known as an ionic bond. The atom which loses one or more electrons becomes a cation—a positively charged ion. The atom which gains one or more electron becomes an anion—a negatively charged ion.
The term "ionic bonding" is given "when the ionic character is greater than the covalent character".
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Heptane and water do not mix, and heptane has a lower density (0.684 g/mL) than water (1.00 g/mL). A graduated cylinder contains 35.0 g of heptane and 41.0 g of water.
What is the volume of heptane in the cylinder in mL?
What is the volume of water in the cylinder in mL?
What is the total volume of liquid in the cylinder in mL?
Answer:
TRY HARD!
Explanation:
DO UR WORK ANG GET IT DONE!
Construct Arguments As they were
discovered, protons, neutrons, and electrons
were each given a name. Develop a logical
argument as to why each of these particles
vas named as it was.
the Particle Neutron is discovered by James Chadwick and as it was the neutral particle he named it so to be neutron. The proton was discovered by Ernest Rutherford and he named his discovery as protons which is based on a Greek word "protos" which means 'First'.
What is Neutron?Neutron is the neutral particle present in the nucleus of an atom with same mass as of protons. It doesn't posses any charge on it.
Proton:Proton is the positively charged particle present in the nucleus of an atom with Neutron. Protons and neutron both have same masses but they differ in their nature.
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Before John Dalton's extraordinary theory, there were other speculations that focused on the components of mass. The subatomic particles that create various sorts of atoms were eventually understood by the scientists. The laws of mass conservation, multiple proportions, and constant composition were all fully established by this theory for the first time. The scientists subsequently made the discovery of three subatomic particles. Numerous more significant discoveries were prompted by the discovery of the electron, proton, and neutron.
Atoms make up matter. A large number of subatomic particles make up one atom. We shall learn who made the discovery of electron protons and neutrons in this section. Each subatomic particle was found as a result of a different series of experiments. Nuclear Physics and its different branches were founded as a result of these revolutionary discoveries made in the 19th and 20th centuries.
To comprehend the physical characteristics of these subatomic particles, it is essential to grasp how the scientists carried out these studies. Discovering how electron proton neutrons are identified by differentiating their characteristics will captivate you.
How Was the Electron Found?
The subatomic particle that is still present outside of the nucleus is an electron. The electromagnetic force of attraction holds it in place. The strong force retains an electron in its orbit despite the enormous distance between it and a nucleus. In the year 1885, Sir William Crookes made the discovery of the electron.
He heated metallic electrodes in a vacuum to conduct a number of tests. He was carrying out tests to examine how metals behave when heated in a vacuum. He had partially evacuated the glass tube in which he was heating the electrodes. A stream of extremely charged particles was seen moving from the negative electrode, or cathode, to the positive electrode of the anode when a high-voltage source was connected to the electrodes.
Crooks observed that these particles moved straight along in the absence of any external magnetic or electric fields. The subsequent investigations carried out by the other scientists led to the conclusion of a set of characteristics of these particles. An outstanding physicist named Sir J. J. Thompson created electrons and improved their physical properties.
How were protons discovered?
A perforated cathode was being used in experiments by Eugen Goldstein, who discovered protons (negative electrode). Although there is air within a glass tube with the electrodes in it, the pressure is quite low. In 1886, he tried. The electron was not found and named during this period. He crossed the electrodes with a high voltage. In that tube, he noticed a crimson glow behind the cathode. This ray was created by electrons moving in the opposite direction to that of cathode rays.
Goldstein thus unintentionally found the proton. Then, the same experiment was carried out on anodes, causing another ray to flow. When there was no electrical or magnetic field present, the particles this time possessed a large mass but still moved straight. It has been effectively explained how these subatomic particles formed in the ray.
Compared to electrons, these particles are significantly heavier. Even when different metals were employed for the same experiment, the charge to mass ratio (e/m) remained constant. Moving on, Rutherford was able to demonstrate that the hydrogen ion (H+), created in 1919 when a hydrogen atom lost an electron, shared the same characteristics as the positive particles moving and creating rays.
Finding of the Neutron After World War I
James Chadwick visited his instructor Ernest Rutherford in England. Under Rutherford's guidance, he finished his doctoral work and focused his investigations on radioactive decay. Rutherford discovered protons in atoms, but Chadwick discovered that protons weren't the only subatomic particles that might be found inside an atom's nucleus.
He then carried out his atomic disintegration experiments and discovered that while helium has an atomic number of 2, it has a mass number of 4. He came to the conclusion that only protons can contain two electrons in a helium atom after conducting a number of further experiments. As a result, other subatomic particles with a proton's mass did not carry a charge. Despite being neutral, these particles had mass. He earned the Nobel Prize in 1935 for his discovery of neutrons.
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Question 2(Multiple Choice Worth 2 points)
(01.02 MC)
A team of researchers is working on a project to make a new kind of carbonless fuel. During their experiment, there is an explosion that destroys the lab. While they
are cleaning the debris, they discover three pieces of frozen metal. The researchers were excited to report that they had discovered a fuel that burns so clean it
becomes cold. Which statement best explains why this scenario represents "bad" science?
O The frozen metal was discovered through biased research practices.
O The clean fuel experiment lacks controlled variables due to the explosion.
O
The experiment is replicable because the testing conditions are included.
O
The result of clean fuel production, the frozen metal, is not observable.
They shouldn't have made a choice based on the frozen metals because scientific research is based on accepted procedures, not on personal bias.
Briefing:
A researcher that is biased is unable to look at experimental observations objectively before drawing any conclusions. Bias is the biggest trap that needs to be avoided when performing a scientific investigation.
When there is a discrepancy between the observation and interpretation of data in a scientific investigation, a bias is introduced.
In the instance of this inquiry, the researchers were already interested in determining whether it was possible to obtain a fuel without carbon. They reached a lobe-sided, unscientific conclusion because they forgot to fully study the chunks of frozen metal since their brains were so clouded by this bias.
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A gas exerts a pressure of 545 atmospheres (atm). What is this pressure in millimeters of mercury (mmHg)?
The pressure of gas in millimeters of mercury is 414200 mm Hg.
How are pressure and volume related to each other?
The actual law is summarised as follows:
Pressure and volume are inversely related for an ideal gas with a fixed mass maintained at a fixed temperature.
Or Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. When the temperature is held constant, pressure decreases as volume increases and vice versa.
Therefore, when the volume is halved, the pressure is doubled; and if the volume is doubled, the pressure is halved.
We know that,
1 atm = 760 mm of Hg
So, 545 atm = 545 × 760 mm Hg
= 414200 mm Hg.
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Pancreatic amylase is digestive enzyme found in the small intestine: It helps break down large starch molecules later in the digestive process Pancreatic amylase is unable to break down lipids Which of the following best explains why pancreatic amylase is able to break down starches, but not lipids? enzymes bind only to their specific substrates lipids are too hydrophobic to be broken down by enzymes. enzymes denature in the presence of lipids lipids are too small to bind to enzymes
Pancreatic amylase is able to break down starches, but not lipids because enzymes bind only to their specific substrates.
Pancreatic amylase is the enzyme secreted by pancreas. One of the important features of all the types of enzymes is the substrate specificity. It ensures that enzyme perform the chemical reaction they are specifically intended to do.
We also see salivary amylase secretion in the mouth which begins the breakdown process of our food. It is again directed towards carbohydrates for instance starch. Lipids are digested by emulsification and proteins are digested by breakdown through peptidases.
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Which image shows the correct way of lining up vectors to add them
together?
O A.
OB.
O C.
O D.
Lavasha's backpack holds up to 14.75 kilograms. What is this mass expressed in grams?
O 14750 g
0.01475 g
1.475 g
O 1475 g
The mass expressed in grams was 0 14750 g.
what is a gram?
A gram is the SI unit of weight in the metric system, and it is frequently abbreviated as "g."A common unit of mass or weight is the pound.Using this metric, we can convert grams to kilograms.The metric units of mass or weight are kilogram and gram.The global measurement norm is the International System of Units (SI), sometimes referred to as the metric system.The definition temperature (0 °C), which was originally altered to 4 °C, the temperature of maximum density of water, was first used in 1795 as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre and at the temperature of melting ice."To learn more about gram refer to
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1. How many moles of carbon dioxide are produced by the decomposition of 25.1 grams of sodium
carbonate (Na₂CO,)?
(6 pts. /2 pts. for equation - 3 pts. for stoich - 1 pt. final answer)
2.33 moles of carbon dioxide are produced by the decomposition of 25.1 grams of sodium.
Molarity is a physical quantity that describes the substance's number of moles available in the unit liter volume of the solution. A mole per liter is a measurable unit to explain molarity.
Number of moles of the NaCl is
np = 3.50 mol
The volume of the solution is np = 1.50 L
The expression for the molarity solution is cm = np/vp
At the value and get the above expression
Cm = 3.50/ 1.50
= 2.33 mol /L
Thus the molarity of the solution is 2.33 mol /L
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What is the number of moles in 3.0 X 10^24 atoms of Carbon
Answer:the number of moles represented by 3.0 x 10^24 atoms of Ag is 0.500mol 0.500 m o l .
Explanation:
An ion has the following Lewis structure where X is an unknown element.Which of the following elements could be X?N As F P Cl Br
The correct option is Br, Cl
What are halogens?
Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and Tennessee are the five or six chemically related elements that make up the halogens group in the periodic table (Ts). Group 17 is the name given to this group in the current IUPAC nomenclature.
The definition of "halogen" is "salt former" (or "salt maker"). Silver bromide, potassium iodide, calcium fluoride, and sodium chloride are just a few of the compounds that are created when halogens combine with metals.
There are other families of halogen oxides that are known to form various anions, including the one shown in the figure attached to the question but which I am unable to reproduce here.
Chlorine, bromine, and iodine frequently combine to create these anions. When the halogen's octet expands, these anions are created. This suggests that the halogen's outermost shell now has more than eight electrons.
Hence, Br and Cl are the correct option
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I need help asap please
The mass of given KBr is 39.151 g.
What is moles?A mole (also called a mole) is a standard scientific unit used in chemistry to measure large amounts of very small entities such as atoms, molecules, or certain other particles.
A mole represents a very large number of units, 6.02214076 × 10²³. The International General Assembly for Weights and Measures defined the mole as this number in the International System of Units (SI), effective from 20 May 2019. A mole was previously defined as the experimentally determined number of atoms in 12 grams of carbon-12. The number of units per mole is also called Avogadro's number or Avogadro's constant, after the Italian physicist Amedeo Avogadro (1776–1856). Avogadro proposed that the same volume of gas under the same conditions contains the same number of molecules. This hypothesis helped determine atomic and molecular weights and led to the concept of moles.
M = n/V
n = M × V
Where, n = number of moles
V = Volume (705 mL or 0.7 L)
M = Molarity (0.47 moles/L)
n = 0.47 × 0.7
n = 0.329 moles
Now, for the mass of solute:
n = m/Mm
m = n × Mm
Where, m = mass of solute
n = number of moles (0.329 moles)
Mm = molar mass (119.002 g/mol)
m = 0.329 × 119.002
m = 39.151 g
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weather is created by differences in ________and________
Weather is created by differences in air pressure and temperature and moisture.
What causes weather?Six main factors make up the weather. These include the following: temperature, atmospheric pressure, the development of clouds, wind, and precipitation. A minor modification to any of these elements may result in a new weather pattern. Every variation in the weather has a cascading effect that affects everyone on the planet.
The sun only warms half of Earth at a time, leaving the other side in shadow. As a result, the sun heats the surface of the Earth unevenly each day, heating some areas more than others. Winds, clouds, and precipitation are all brought on by these temperature differences.
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Calculate pH and pOH
Calculate pH and pOH for each of the following solutions at 25°C
a. 1.0×10-³ MOH⁻
b. 1.0 MH⁺
Part a
[tex]\text{pOH}=-\log(1.0 \times 10^{-3}})=\boxed{3}\\\\\text{pH}+\text{pOH}=14 \implies \text{pH}=\boxed{11}[/tex]
Part b
[tex]\text{pH}=-\log(1.0)=\boxed{0}\\\\\text{pOH}+\text{pH}=14 \implies \text{pOH}=\boxed{14}[/tex]
throughout the extraction steps of this week's oxidation reaction procedure, which of the following compound(s) is/are present in the bottom layers? group of answer choices sodium acetate sodium chloride and sodium acetate 9-fluorenone sodium chloride
The organic phase is a solvent, usually dichloromethane or diethyl ether, that disperses very little in water. The 9-fluorenone was dried, isolated, and saltified with sodium sulfate.
What are the three primary types of extraction techniques?There are a number of extraction processes, including solvent extraction, distillation, pressing, and sublimation, that can be used. Solvent extraction is the method that is most frequently used.
What kind of extraction is most typical?extracting liquid from liquid When a substance is "extracted," it is moved from a solid or liquid into a separate solvent or phase. The method most frequently used in chemical labs is liquid-liquid extraction, which takes place in a separatory funnel.
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g starting with toluene which sequence of reactions below works best to prepare the following cyclohexadiene compound
The toluene which sequence of reactions below works best to prepare the following cyclohexadiene compound is given as :
NBS , heat NaOCH₃ Na, NH₃
Toluene ------------------> -----------------> ------------>
CCl₄ CH₃OH CH₃OH
The substituted aromatic hydrocarbon is the toluene compound. . the cyclohexadiene is used as the initial material for the synthesis of the many natural complex products. the cyclohexadiene can be formed by the toluene . the synthesis which is the best to prepare the cyclohexadiene from the compound that is toluene is given as follows :
NBS , heat NaOCH₃ Na, NH₃
Toluene ------------------> -----------------> ------------>
CCl₄ CH₃OH CH₃OH
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to determine the unknown concentration of copper ions in solution, you will first prepare a calibration curve. the calibration curve plots
Use equation: (C=m/V). Now, the known concentration of copper(ll) ion solution and a colorimeter to produce a cu(ll) ion conc./absorbance calibration curve. you will be able to read its conc. from the curve.
How is titration used to determine an unknown concentration?A titration is a technique in which a solution of known concentration is used to determine the concentration of an unknown solution. The titrant (the known solution) is added from a buret to a known quantity of the analyte (the unknown solution) until the reaction is complete.
What is the use of calibration curve?A calibration curve is a way to identify the concentration of an unknown compound. These curves use data points of known compounds at varying concentrations, and researchers or developers can use these curves to find where an unknown substance plots.
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CH4, has a mass of 38.25 g. Calculate the number of methane molecules
Answer:
1.43 x 10^24 molecules
Explanation:
Molecular mass of methane = 12.01 + 4(1.01) = 16.05 g/mol
so mol of 38.25 g equals 38.25g x (1 mole/16.05g = 2.38 mol
1 mole = 6.022 x 10^23 molecules
so 2.38 mol will have 2.38 x 6.022 x 10^23 = 1.43 x 10^24 molecules
The boiling point of H2O is much higher than that of the analogous molecule H2S. This is mostly due to _________.
The boiling point of water is higher than that of hydrogen sulfide. the molecular mass of H₂S is higher than that of H₂O.
Despite the fact that H₂O has a lower molar mass than H₂S, why is the normal boiling point of H₂O higher than that of H₂S?Unlike H₂O, which has a hydrogen bond, H₂S exhibits dipole-dipole attraction. Since the hydrogen bond is stronger than the attraction between the dipoles, it takes more energy to separate the molecule and form a gas, giving H₂O a higher boiling point.
Compared to hydrogen sulfide, water has a higher boiling point. Due to hydrogen bonding in H2O and the hydrogen atoms' small size and high electronegativity, the intermolecular forces between water molecules are stronger than those between H2S molecules.
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What mass of phosphate ions are present in 25.8 g of tin (IV) phosphate?
The mass of phosphate ions are present in 25.8 g of tin (IV) phosphate is 13.3 g/mol.
What is phosphate ?An anion, salt, functional group, or ester produced from phosphoric acid is referred to as a phosphate in chemistry. Most frequently, it refers to orthophosphate, a product of orthophosphoric acid H 3PO 4. The elimination of three protons H+ results in the formation of the phosphate or orthophosphate ion [PO 4]3 from phosphoric acid.
Phosphate in excess can be harmful. It can impair the body's utilization of iron, calcium, magnesium, and zinc and result in diarrhea, calcification (hardening) of organs and soft tissue.
25.8 g of Sn₃(PO₄)₄
mol.wt of Sn₃(PO₄)₄ is 736.015
no. of mole of Sn₃(PO₄)₄= 25.8/736.015 moles
Sn₃(PO₄)₄ has 3 Sn⁴⁺ and 4(PO₄)³-
so, no. moles of (PO₄)³- = 4 * 0.0351
= 0.1402
mol.wt of (PO₄)³- is 95g/mol
mole = wt/ mol.wt
wt = 0.1402 *95
= 13.3 g/mol
Thus, The mass of phosphate ions are present in 25.8 g of tin (IV) phosphate is 13.3 g/mol.
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Chlorine atom gains one electron in the outermost shell to complete the octet. On gaining one electron, a negatively charged chloride ion is formed.
To complete the octet, the chlorine atom acquires one electron in the outermost shell. A negative charged chloride ion is created when an electron is added.
Where is the outermost shell?Valence shell refers to the outermost shell around an atom. The electrons found in this shell, which is the atom's outermost one, are known as valence electrons. - The number of an atom's outermost electrons is hence its valency.
Is valence a outer shell?In physics and chemistry, an electron is just a particle that is a component of the outer shell of an atom. The electron configuration can participate in the creation of a chemical bond if the the outside is open. an element's atom's capacity to form chemical bonds. Valence electrons: The electrons in the outermost shell are referred to as valence electrons.
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Which of the following statements are true regarding types of stem cells
I. Totipotent stem cells can only become tissues of the body
II. Multipotent stem cells are found in adults and stay dormant until needed
III. Meristematic stem cells are only found in plants
IV. Pluripotent stem cells can become tissues of the body and the placenta
A. II, III, and IV
B. II and III
C. II and IV
Answer:
The answer is A. II, III and IV
Context: find how much vinegar and baking soda needed to fill 750 ml plastic bag with CO2. How do I calculate how much vinegar I need. Answer should be around 35-40 grams
The mass of vinegar required to react with baking soda to produce 750 mL of CO₂ is 2.01 g.
How much vinegar is needed to produce enough CO₂ to fill a 750 mL plastic bag?The mass of vinegar required to produce 750 mL of CO₂ is calculated as follows:
Equation of reaction: CH₃COOH + NaHCO₃ ---> CH₃COONa + H₂O + CO₂
From the equation of the reaction, 1 mole of vinegar, CH₃COOH reacts with 1 mole of baking soda to produce 1 mole of CO₂.
Assuming the reaction takes place at STP conditions, the volume of 1 mole of CO₂ is 22400 mL.
Mooles of CO₂ in 750 mL will be 750 * 1 mol/22400 = 0.0335 moles
Moles of vinegar required will then be 0.0335 moles
Molar mass of vinegar = 60 g/mol
Mass of 0.0335 moles of vinegar will be 60 * 0.0335 moles = 2.01 g
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For the molecule, GeO2, determine its Lewis structure, bonding pairs/lone pairs, electron geometry, its shape, and whether or not the molecule is polar.
The correct answers to the problem given above about germanium IV oxide are as follows:
a. The Lewis structure of the molecule; GeO₂ simply is O = Ge = Ob. The bonding pairs/lone pairs of the molecule GeO₂ are two bond electron pairs and four electrons respectively.c. The electron geometry of GeO₂ is linear geometry d. The shape of germanium IV oxide is α-quartz type hexagonal structuree. Germanium oxide is a polar molecule.What is meant by GeO₂GeO₂ is a chemical compound also known as germanium oxide, germanium dioxide or germanium IV oxide. It is a polar covalent which is a soluble substance to some extent.
In conclusion, it can be deduced from the explanation given above that germanium IV oxide is a chemical compound.
The complete lewis structure of germanium IV oxide is attached.
Complete question:
Answer the following questions about germanium IV oxide, GeO₂
a. Determine its lewis structure.
b. Its bonding pairs/lone pairs
c. What is its electron geometry (GeO₂)?
d. Its shape (GeO₂)?
e. Is germanium IV oxide a polar or non-polar molecule?
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how might the properties of the air masses change when its late july(summer)
Answer:
Moving from one environment to another causes it to change
what is the maximum number of electrons (in a single atom) that can be associated with each of the following combinations of quantum numbers?
The maximum number of electrons that can be associated with each of the following combinations of quantum numbers :
a) n = 7, l= 6 is 26 electrons
b) n = 4 , l = 3, ml = +3 is 2 electrons
The maximum number of the electrons in the given set of quantum numbers is given as follows :
a) n = 7 and l = 6
m = -l to + l
total values of m = 2l + 1
= 2 ( 6 ) + 1
= 13 values
that means we have 13 orbitals corresponding to the values of n = 7 and l = 6
so, the maximum number of electrons = 13 × 2
= 26 electrons
b) n = 4, l = 3 and m = + 3
here the value of m is given, this means that we have uniquely identified an orbital. an orbital can have maximum two electrons.
therefore, the maximum number of the electrons = 2
The question is incomplete , the complete question is :
The maximum number of electrons that can be associated with each of the following combinations of quantum numbers :
a) n = 7, l= 6
b) n = 4 , l = 3, ml = +3
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Calculate the wavelength and frequency and energy in joules pee mole of an electron that undergoes a transition from level n=2 to level n=1
The wavelength is same.
What is wavelength?Wavelength can be defined as the distance between two successive crests or throughs of a wave.
The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from 2 to 1.
A good starting point here will be to calculate the energy of the photon emitted when the electron falls from 1 to 2
by using the Rydberg equation.
1/π = R
λ
si the wavelength of the emittted photon R
is the Rydberg constant, equal to 1.907.
This means that you haveλ=
4.10
So, you know that when an electron falls from
to
a photon of wavelength
410 nm
is emitted. This implies that in order for the electron to jump from the 2 to 1
, it must absorb a photon of the same wavelength.
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In a specific molecule, there are 21 continuous conjugated bonds (each 140 pm in length) . You can assume this system can be approximated by a one-dimensional particle in a box (particle on a line). How much energy would be required to promote an electron from the n = 11 level to the n= 12 level?
3.7*[tex]10^{-20}[/tex] J energy would be required to promote an electron from the n = 11 level to the n= 12 level.
According to particle in a box model energy is
E=[tex]\frac{n^{2} }{8ml^{2} } h^{2}[/tex] where n = no of energy level = 10
h is Planck constant, m is mass of electron= 9.1*[tex]10^{-31}[/tex]kg
and l is length of box= 140pm= 140*[tex]10^{-10}[/tex] m.
so E =3.7*[tex]10^{-20}[/tex]J.
What is particle in a box model?
The particle in a box model, sometimes referred to as the infinite potential well or the infinite square well, in quantum mechanics depicts a particle that is free to travel in a constrained area enclosed by impenetrable barriers.
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