An electron initially in the n = 5 orbital of a hydrogen atom emits a photon with a wavelength of 1284 nm. Calculate the
final orbital, nf.
O a. 6
Ob. 3
Ос. 2
O d. 1
e. 4
Answers
Answer: 3
Explanation:
You want to use the Rydberg equation which is given by
\(E = -R_{H}(\frac{1}{n_{final}^2} - \frac{1}{n_{initial}^2})\)
where \(R_H = 2.18 \, \cdot 10^{-18} J\).
We are however given the wavelength instead of energy, and so we need to represent E in terms of its wavelength, and so we use \(E = \frac{hc}{\lambda}\). Remember that λ must be in meters in this formula. So we can divide 1284 nm by \(10^9\) to get the wavelength in meters. This gives \(\lambda = 1.284 \, \cdot 10^{-6}\) meters. Putting this all together we have
\(\frac{hc}{\lambda} = -R_{H}(\frac{1}{n_{final}^2} - \frac{1}{n_{initial}^2})\)
where
\(h = 6.626 \cdot 10^{-34} J\cdot s\\c = 2.998 \cdot 10^{8}\, m/s\\\lambda = 1.284 \cdot 10^{-6}\, m\\R_H = 2.18 \, \cdot 10^{-18} J\\n_{initial} = 5\\n_{final} = \, ?\)
If we plug in everything we should get roughly \(n_f = 3.00194\) but remember that orbitals must be a whole number and so you would round to the closest integer which gives \(n_f = 3.\)
Related Questions
You have 5000 atoms of gold and 5000 atoms of silver. Which statement is true.
You have the same mass of each.
You have the same number of moles of each.
Both are true.
Neither are true.
Answers
"You have the same number of moles of each." is the true statement.
The mass of Gold and Silver differ, so that first statement can't be true because the quantities are the same. Because a mole measures solely amounts, like a dozen does, you will have the same amount of moles if the quantities are the same.
If an element has 11 protons and 11 neutrons in its nucleus it
must be:
a Helium
b Sodium
c Potassium
d Nitrogen
Answers
letter b. sodium
An element contains protons and neutron inside the nucleus and electrons that revolve in fixed orbits. Therefore the correct option is option B that is sodium.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
Element with 11 protons and 11 neutrons suggest that atomic number of element is 11 as number of proton is equal to number of electrons which is equal to atomic number. Mass number of elemet is equals to 11+11= 22. This all indicate that element is sodium.
Therefore the correct option is option B.
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If I have 9.00 x 10^24 peanuts, how many moles (of peanuts) do I have?
Answers
Approximately 1.50 moles of peanuts in 9.00 * 10^{24} peanuts
To answer your question, we will use the concept of moles, which is a unit of measurement in chemistry that helps to relate the number of particles (in this case, peanuts) to a more manageable and comparable quantity.
First, we need to know the number of peanuts in one mole. This value is known as Avogadro's number, which is approximately 6.022 * 10^{23} particles per mole. Now, we will use this information to calculate the number of moles of peanuts in the given amount.
Step 1: Identify the given amount of peanuts:
9.00 * 10^{24} peanuts
Step 2: Divide the given amount of peanuts by Avogadro's number:
\frac{9.00 * 10^{24} peanuts) }{ (6.022 * 10^{23} peanuts/mole)}
Step 3: Perform the calculation:
(\frac{9.00 }{ 6.022}) * (\frac{10^{24 }10^{23}) ≈ 1.495
Step 4: Round the answer to a reasonable number of significant figures (in this case, three):
1.50 moles
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8) A 13.5 liter balloon is heated from 248 K to 324 K. What will its new
volume be?
Answers
Answer:
It's new volume will be approximately 17.637 liters.
Explanation:
1 mole of any gas is equivalent to?
Answers
Answer:
22.4 L at standard temperature and pressure.
fungi have eukaryotic cells (large cells with a nucleus), like animals and plants
True or false?
Answers
Which properties determines the element that an atom Is?
A. number of neutrons in the atom
B. number of electrons in the atom
C. number of protons in the atom
D. number of protons plus number of electrons
Answers
Answer:
The answer would be C. Number of protons in the atom.
Explanation:
On the periodic table, you see the element, with a big number at top, and a small number below the element name/abbreviation.
The big number is the amount of protons of the atom, which define each atom. The smaller number represents the atomic mass of the atom.
#teamtrees #WAP (Water And Plant)
From XNH,(g) + YO₂ g → ZNO(g), + QH₂O (g) the value of Z is
please guys...I need help asap....
Answers
Answer:
4
Explanation:
A ground glass joint should be greased before use. Apply____(options: a large glob, a complete coating, a thin line) of grease to____(options: the outer part, both parts, the inner part) of the joint. Then, (options: wipe the joint with a cloth, run a stick around the joint, connect and turn the joint) to distribute the grease. You____(options: should, should not) be able to see the grease in a properly greased joint.
Answers
The proper way to grease a ground glass joint is to apply a thin line of grease to the inner part of the joint and then connect and turn the joint to distribute the grease, ensuring that the grease is visible in the properly greased joint.
What is the proper way to grease a ground glass joint?A ground glass joint is commonly used in laboratory glassware to connect two pieces of glassware, such as a flask and a condenser, creating an airtight and leak-proof seal.
To ensure that the joint functions properly, it is essential to grease it before use.
The proper way to grease a ground glass joint is to first apply a thin line of high-vacuum grease or silicone grease to the inner part of the joint, making sure that it is evenly spread.
Then, connect the two pieces of glassware and turn the joint several times to distribute the grease evenly. Finally, inspect the joint to ensure that the grease is visible, indicating that the joint has been properly greased.
This simple procedure helps to prevent leaks and ensures accurate and precise laboratory experiments.
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In the Diels Alder reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride, what was the %recovery using the information below?
Weight of maleic anhydride used: 1 85 mg = 0.1 85g Volume of diene used: 0.215mL Weight of cyclic anhydride crystals recovered: 0.251g % Recovery:
Answers
Recovery = (Weight of product recovered ÷ Theoretical yield) × 100% Recovery = (0.251 g ÷ 0.27594 g) × 100% Recovery = 91.08%Therefore, the % recovery of the reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride was 91.08%.
Diels-Alder Reaction Diels-Alder reaction is a chemical process that joins a conjugated diene with a dienophile (a compound containing a double bond) to form a six-membered ring called a cyclohexene ring. It is a chemical reaction that can be used to make new carbon–carbon bonds. The reaction was discovered by two German scientists, Otto Diels and Kurt Alder, in 1928.In the Diels-Alder reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride, the % recovery was calculated using the following data:Weight of maleic anhydride used: 185 mg = 0.185 gVolume of diene used: 0.215 mLWeight of cyclic anhydride crystals recovered: 0.251 g% Recovery:We can calculate the percent recovery using the following formula:% Recovery = (Weight of product recovered ÷ Theoretical yield) × 100The theoretical yield of the product can be calculated from the balanced chemical equation as follows:2,3-dimethyl-1,3-butadiene + Maleic Anhydride → Cyclohexene-1,2-dicarboxylic AnhydrideThe molar mass of 2,3-dimethyl-1,3-butadiene is 68 g/mol. The molar mass of Maleic Anhydride is 98 g/mol. The molar mass of Cyclohexene-1,2-dicarboxylic Anhydride is 146 g/mol.Using these values, we can calculate the number of moles of each reactant: moles of diene used = (0.215 mL)(0.788 g/mL)/(68 g/mol) = 0.00248 mol moles of maleic anhydride used = 0.185 g/98 g/mol = 0.00189 mol The theoretical yield of cyclohexene-1,2-dicarboxylic anhydride = 0.00189 mol × 1 mol/1 mol = 0.00189 molThe theoretical yield of cyclohexene-1,2-dicarboxylic anhydride = 0.00189 mol × 146 g/mol = 0.27594 gNow, we can substitute these values into the percent recovery equation:% Recovery = (Weight of product recovered ÷ Theoretical yield) × 100% Recovery = (0.251 g ÷ 0.27594 g) × 100% Recovery = 91.08%Therefore, the % recovery of the reaction between 2,3-dimethyl-1,3-butadiene and maleic anhydride to form cyclic anhydride was 91.08%.
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I would like to know if question number 3 is rite
Answers
The balanced reaction of this chemical reaction is as follows :
\(2HClO_4(aq)\text{ + Ba}(OH)_2(aq)\text{ }\Rightarrow Ba(ClO_4)_2(aq)+2H_2O(l)\text{ }\)• As we can see, this is a double-displament reaction
for a zeroth-order reaction, if the concentration of reactant a is plotted vs. time, which corresponds to the slope of this plot?
Answers
The slope of a plot of concentration of reactant A versus time for a zeroth-order reaction represents the rate of reaction. In a zeroth-order reaction, the rate of reaction is constant and independent of the concentration of the reactant. Thus, the slope of the plot will be a constant value that represents the rate constant of the reaction. This means that the rate of the reaction is proportional to the negative of the slope of the plot, and the units of the rate constant will be concentration/time.
In a zeroth-order reaction, the rate of reaction is directly proportional to the concentration of reactant and is independent of time. If we plot the concentration of reactant "a" against time, the slope of this plot will correspond to the rate of the reaction at that particular time. The slope will be negative, indicating that the concentration of reactant is decreasing as time passes. The magnitude of the slope will reflect the speed of the reaction and how quickly the reactant is disappearing. Zeroth-order reactions have a constant rate, and the slope of the plot will remain the same, regardless of the concentration of the reactant. This makes zeroth-order reactions useful in applications such as drug kinetics, where the rate of reaction is a critical factor.
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C5H12(g) + O2(g) → CO2(g) + H₂O(g)
Classify the reaction
Answers
The combustion reaction is the process by which a chemical substance or hydrocarbon reacts with oxygen to produce carbon dioxide and water while also releasing energy in the form of light and heat.
What is combustion reaction?When a chemical substance interacts with oxygen to create carbon dioxide and water, a combustion process occurs and energy is released. O2 must be one of the reactants in it.An illustration of a combustion reaction is the burning of wood or coal indoors during the winter.Another illustration of a combustion reaction is the generation of energy in thermal power plants and the burning of gasoline and diesel in automobiles.An illustration of a general combustion reaction is as follows:O2 + CnH2n = nCO2 + nH2OFor more information on combustion reaction kindly visit to
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What are the products of the combustion of a hydrocarbon?
carbon and oxygen
carbon dioxide and water
carbon and hydrogen
carbon dioxide and hydrogen
Answers
Answer:
I think carbon and hydrogen
Answer:
Its carbon and hydrogyen
Explanation:
got it right on edge
How much H2 is generated from the electrolysis of 150 grams of H2O
Answers
Answer:
16.67 grams of H₂ is generated from the electrolysis of 150 grams of H₂O
Explanation:
Electrolysis is the decomposition of a chemical element under the effect of an electric current. So, electrolysis of water is the process of decomposing the H₂O molecule into separate oxygen and hydrogen gases due to an electric current passing through the water.
The balanced equation of electrolysis of water is:
2 H₂O → O₂ + 2H₂
Being:
H: 1 g/moleO: 16 g/molethen the molar mass of the compounds that participate in the reaction is:
H₂O: 2*1 g/mole + 16 g/mole= 18 g/moleH₂: 2*1 g/mole= 2 g/moleO₂: 2*16 g/mole= 32 g/moleIf the following amounts in moles are reacted by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction):
H₂O: 2 molesH₂: 2 molesO₂: 1 molethe amount of mass, by stoichiometry, that reacts and is produced is:
H₂O: 2 moles*18 g/mole=36 gH₂: 2 moles* 2 g/mole= 4 gO₂: 1 mole* 32 g/mole= 32 gThen you can apply the following rule of three: if by stoichiometry 36 g of H₂O generate 4 g of H₂, 150 g of H₂O how much mass of H₂ will it generate?
\(massofH_{2} =\frac{150 grams of H_{2}O*4 grams ofH_{2} }{36 grams of H_{2}O}\)
mass of H₂= 16.67 grams
16.67 grams of H₂ is generated from the electrolysis of 150 grams of H₂O
What is formed if two or more atoms join together?
A. Compound
B. Electronegativity
C. Nucleus
D. Element
HELP
Answers
Answer:
compound
Explanation:
compound = A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule.
write a brief summary comparing the current concentrations of carbon dioxide and methane in the atmosphere with the greatest concentrations of these gases prior to 1700
Answers
Prior to 1700, the concentrations of carbon dioxide and methane in the atmosphere were relatively stable at around 280 ppm and 700 ppb, respectively.
However, due to human activities such as burning fossil fuels and deforestation, the concentrations of these gases have increased significantly since the Industrial Revolution. Currently, the concentration of carbon dioxide is around 415 ppm, and the concentration of methane is around 1,850 ppb. This rapid increase in greenhouse gas concentrations is causing climate change and its associated impacts, such as rising temperatures, sea level rise, and more frequent extreme weather events.
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which of the following is an example of an empirical formula?
A. C4H10
B. C2H6
C. CO2
D. H2O2
Answers
Empirical formulas are the most simple ratio and CO2 cannot be simplified down any further.
which of the following is an example of how research into the effects of a chemical has changed how it is used
Answers
Answer: Finding out that asbestos is dangerous and limiting its use in building materials
Explanation:
the combustion of ammonia in the prescne of excess oxygen yield no2 and h2o. how many grams of no2 are produced when 43.9mg of ammonia burn
Answers
The combustion of ammonia in the prescne of excess oxygen yield no2 and h2o. 0.119 grams of no2 are produced when 43.9mg of ammonia burn.
Molar mass of NH3 = 1*MM(N) + 3*MM(H)
= 1*14.01 + 3*1.008
= 17.034 g/mol
mass of NH3 = 0.0439 g
mol of NH3 = (mass)/(molar mass)
= 0.0439/17.034
= 2.577*10^-3 mol
From balanced chemical reaction, we see that
when 4 mol of NH3 reacts, 4 mol of NO2 is formed
mol of NO2 formed = moles of NH3
= 2.577*10^-3 mol
Molar mass of NO2 = 1*MM(N) + 2*MM(O)
= 1*14.01 + 2*16.0
= 46.01 g/mol
mass of NO2 = number of mol * molar mass
= 2.577*10^-3*46.01
= 0.119 g
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The PE of a magnet in the presence of another magnet is related to -
Answers
How close the magnets are together and which direction the poles are pointed to
estions
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Check My Work (2 remaining)
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Jamal is a student in the health care professions class. He had a very exciting day at clinical and decided to post about
it on his social media account. He posted the following “Great day saving lives today! I did CPR and saved the patient!"|
Jamal did not post his location or the patient's personal health information; however, a friend of his (Dario) saw the
post and realized that his neighbor was in a similar situation that day, Dario called his neighbor's wife and inquired as
to his health. During the conversation, Dario told the wife that his friend was there and performed the CPR. The wife
reported Jamal to his program director,
Which law did Jamal violate?
Оа. НІРАА
b. FERPA
c. Affordable Care Act
d. None
Answers
Answer:
The correct option is;
a. HIPAA
Explanation:
The federal law which safeguards Personal Health Information (PHI) is the health Insurance Portability and Accountability (HIPAA) Act of 1996 with rules regarding the security, privacy and transmission (electronically) of medical health data, was passed to improve the ease healthcare movement between healthcare providers has also added new limitations on PHI disclosure
The HIPAA restricts with whom, when, how and where PHI can be disclosed including physically (direct in person or writing) or electronically (online, over the phone)
Therefore, Jamal had violated HIPAA.
based on your knowledge of intra- and intermolecular forces, choose the answer with the compounds listed in order of increasing boiling point.A) SbCI5 < BrF5< NH3< MgBr2B) MgBr2 < NH3 < BrF5 < SbCI5C) BrF5 < SbCI5 < MgBr2 < NH3D) MgBr2 < BrF5 < SbCI5 < NH3
Answers
The answer is (D) MgBr2 < BrF5 < SbCI5 < NH3 with the compounds listed in order of increasing boiling point
D) MgBr2 < BrF5 < SbCI5 < NH3
This ordering is consistent with the strengths of intermolecular forces in each compound. MgBr2 has the highest boiling point due to its strong ionic bonds, followed by BrF5 with its strong dipole-dipole interactions. SbCI5 has weaker dipole-dipole interactions than BrF5, so it has a lower boiling point. NH3 has the weakest intermolecular forces of all the compounds listed, so it has the lowest boiling point.
The boiling point of a compound is primarily determined by the strength of its intermolecular forces. Compounds with stronger intermolecular forces will have higher boiling points, while compounds with weaker intermolecular forces will have lower boiling points.
Therefore, the correct answer is (D) MgBr2 < BrF5 < SbCI5 < NH3.
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what was the 'elixir of life'
Answers
What is the Molar Mass of BaCl2?
Answers
Calcium is element 20 in the Periodic Table, has a mass of 40 amu and forms a 2+ ionic species. The calcium ion therefore has a. 18 protons, 18 neutrons and 22 electrons b. 22 protons, 18 neutrons and 18 electrons c. 20 protons, 20 neutrons and 18 electrons d. 18 protons, 20 neutrons and 20 electrons e. 20 protons, 18 neutrons and 20 electrons 1. In the following expression a∼1/b, what is the relationship between the components a and b ? a. Direct proportion b. None of the above c. Exact equation d. Inverse proportion e. Proportionality constant
Answers
The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.
The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.
The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.
The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.
So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons
In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion
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2. Which of the following best describes temperature? *
O Number of molecules
Motion of molecules
O Size of molecules
O Type of molecules
Answers
Answer:
motion of molecules because we gonna see which one is in a solid state and what's so ever
describe the role of each section of a nephron as material travels through. Indicated the direction (in or out of the tubule) and the type of transport (active or passive) of Na+ and H20 in the different sections, as appropriate.
Answers
The role of each section and the direction and type of transport of Na+ (sodium) and H2O (water) in the different sections,
1. Renal Corpuscle (Glomerulus and Bowman's Capsule)
2. Proximal Convoluted Tubule (PCT)
3. Loop of Henle
4. Distal Convoluted Tubule (DCT)
5. Collecting Duct
1. Renal Corpuscle (Glomerulus and Bowman's Capsule): Filtration occurs here as blood enters the glomerulus under high pressure. Small molecules such as water, electrolytes, glucose, and amino acids are passively filtered out of the glomerular capillaries into Bowman's capsule. Both Na+ and H2O are filtered out of the blood.
2. Proximal Convoluted Tubule (PCT): Reabsorption occurs in this section. Na+ is actively transported out of the tubule and into the surrounding interstitial fluid through active transport mechanisms. This creates an osmotic gradient, leading to the passive reabsorption of water. Thus, both Na+ and H2O move from the tubule into the interstitial fluid.
3. Loop of Henle: The loop consists of a descending limb and an ascending limb. In the descending limb, water moves out of the tubule passively due to the high osmolarity of the medullary interstitium. In the ascending limb, Na+ is actively transported out of the tubule, while water remains impermeable. This creates a diluting segment, leading to the excretion of dilute urine.
4. Distal Convoluted Tubule (DCT): Further fine-tuning of reabsorption occurs here. Na+ is actively transported out of the tubule, and water can follow passively depending on the body's hydration status and hormonal control. The movement of Na+ and water can be regulated by hormones like aldosterone and antidiuretic hormone (ADH).
5. Collecting Duct: The final adjustments of urine concentration take place in the collecting duct. Na+ can be actively reabsorbed or secreted depending on the body's needs, while water movement is regulated by ADH. ADH increases water permeability, allowing for water reabsorption and concentration of urine.
Overall, Na+ is actively transported out of the tubule in the proximal tubule, ascending limb of the loop of Henle, and distal tubule, while water movement can be both passive and regulated by hormonal control. The direction and type of transport of Na+ and H2O vary depending on the specific section of the nephron and the body's physiological requirements.
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Question 11
Which formula represents a hydrocarbon?
C₂H6
C₂H5OH
C₂H5Cl
C₂H6O
Answers
Answer:
C₂H6
Explanation:
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A
A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:
A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.
B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.
D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.
In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A
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What is the amount of aluminum chloride produced from 40 moles of chlorine and excess aluminum?
Answers
Answer: Molar mass of Al = 26.98 g/mol
mass of Al = 12 g
mol of Al = (mass)/(molar mass)
= 12/26.98
= 0.4448 mol
According to balanced equation
mol of AlCl3 formed = moles of Al
= 0.4448 mol
Answer: 0.445 mol
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Explanation: