Answer:
E = 1.8 x 10⁵ J/mol
Explanation:
We are being asked the enery per mol for an emission line corresponding to 649 nm.
The energy of a photon is given by the porduct of Planck's contant times the frequency of the radiation,
E = hν
We also know that the frequency is given by
ν = c/λ
where c is the speed of light (3 x 10 ^8 m/s) and λ is 649 nm given in the problem. Therefore the energy per photon will be given by
E= hc/λ = 6.626 x 10⁻³⁴Js x 3 x 10 ^8 m/s/ 649 x 10 ⁻⁹ m
E = 3.1 x 10 ⁻¹⁹ J/ photon
(Note the wavelength has to be in nanometers (1nm= 10⁻⁹ m) and that the energy we get is the energy per a single photon. Thus we will need to multiply this result by Avogadro's number to answer this question.
E = 3.1 x 10 ⁻¹⁹ J/ photon x 6.022 x 10 ²³photon/mol
E = 1.8 x 10⁵ J/mol
The energy of the 649 nm emission from strontium ions in a flare is approximately 1.83 x 10⁵ Joules per mole. This calculation is done using the formula for energy of a photon and converting it to energy per mole using Avogadro's number.
The energy of a single photon can be calculated using the equation E=hc/λ, where h is Planck's constant (6.626 x 10⁻³⁴ J.s), c is the speed of light (3.00 x 10⁸ m/s), and λ is the wavelength of the light in meters. First, let's convert the wavelength from nanometers to meters, which results in 649 x 10⁻⁹ m.
Putting these values into the equation, we get E= (6.626 x 10⁻³⁴ J.s x 3.00 x 10⁸ m/s) / (649 x 10⁻⁹ m). The calculated value is about 3.05 x 10⁻¹⁹ J. However, the question asks for the energy in joules per mole. Multiplying this value by Avogadro's number (6.022 x 10²³ mol⁻¹), we get about 1.83 x 10⁵ J/mol.
Therefore, the energy of the 649 nm emission from strontium ions in a flare is approximately 1.83 x 10⁵ Joules per mole.
#SPJ3
The atoms that would sterically interact with methyl group located axially are highlighted in pink color in the attached image.
Further Explanation:
The stereoisomer of a molecule that has same chemical formula and connectivity of bond but differs in the arrangement of the atoms in space is known as conformer. The rotation about the carbon-carbon single bond can lead to the formation of conformer of a molecule.
There are four conformers of cyclohexane molecule as follows:
Chair conformation is considered as the best conformation of cyclohexane. The hydrogen in blue denote the axial positions and the hydrogen in pink denote equatorial positions. (Refer to the attached image)
The stable conformation is that in which the bulky groups such as hydroxyl, methyl, and nitro group occupy the equatorial positions while the relatively small groups such as hydrogen atoms occupy axial positions. The reason is that the axially placed substituents suffer more steric repulsion and that generates strain in the molecule. The strain leads to high energy and thus less stability.
While writing the chair conformation the bulkier groups are preferentially placed at equatorial positions. The conformation that has bulky group at equatorial position is more favorable than the conformation that has bulky group at axial position. The reason for the stability of the conformation is diaxial interactions.
1,3-diaxial interaction: The 1,3-diaxial interactions occur among the axial substituent present at 1 and 3 positions.
The conformation in the problem has axial substituent hydrogen and bromine at the two positions 3 and 3’ which lead to 1,3-diaxial strain in the molecule and makes it unstable. (Refer to the attached image)
Learn more:
1. Balanced chemical equation brainly.com/question/1405182
2. Oxidation and reduction reaction: brainly.com/question/2973661
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Conformation of cyclohexane
Keywords: Cyclohexane, planar, chair conformation, axial positions, equatorial positions, steric repulsion, high energy, 1, 3-diaxial interaction, 1, 3-diaxial strain.
In a substituted cyclohexane, 1,3-diaxial interactions happen between groups on the same side of the ring but are two carbons apart. In this scenario, the hydrogen atoms on carbons 3 and 5 would interact with the methyl group, causing steric strain.
In a substituted cyclohexane compound, 1,3-diaxial interactions occur between groups that are on the same side of the ring but are two carbons apart. In this case, the question focuses on the steric interactions with the methyl group. Assuming that the methyl group is on carbon-1 of the ring, the hydrogen atoms on carbons 3 and 5 (both axial positions) on the same face of the ring would sterically interact with the methyl group in a 1,3-diaxial fashion. This steric interaction leads to steric strain, which destabilizes the compound and promotes a conformational flip to relieve this strain.
#SPJ6
Answer:
which one do u want help with?
Explanation:
B. nuclear separation.
C. nuclear fission.
D. nuclear fusion.
Answer is: C. nuclear fission.
Nuclear fission is a nuclear reaction or a radioactive decay where nucleus of atom split into smaller ligher nuclei.
Nuclear fission is exothermic reaction which release large amounts of energy (electromagnetic radiation or as kinetic energy, which heat reactors where fission reaction take place).
Answer: The process of splitting of an atom into two lighter atoms is called is called nuclear fission.
Explanation:
There are two types of nuclear decay reactions:
Hence, the process of splitting of an atom into two lighter atoms is called is called nuclear fission.
Answer:
Ans:
*Carbohydrates
*Proteins
*Cholesterol
Explanation:
The plasma membrane is a structure that has several distinct roles in the cell
The plasma membrane is mainly composed of the phospholipid Bilayer, which is a layer of two sheets located in the internal and external parts. The Phospholipids are said to be Amphipathic because they have both properties of Hydrophobic and hydrophilic
*The Carbohydrate Molecules attach to the Plasma Membrane such as to the lipids and Proteins:
when They attach to the Proteins, they are known as glycoproteins, and they help in cell recognition, when they attach to the lipids, they are known as Glycolipids
*Protein Molecules play an important role in transport system such as Carrier Proteins
*Cholesterol Molecules help in balancing the Fluidity of the plasma membrane
hope this was of use
Answer:
Explanation:
In an artificial transmutation, atoms of one element are artificially made to strike other particles with in an accelerator. Usually in an Artificial transmutation, there are particle accelerators that bombard the elements with in them using alpha particles, deuterons etc.
This bombarding causes lodging of certain elements into the targeted nucleus, thereby forming a new and a different element.
For example -
In the first artificial transmutation, Helium nucleus was bombarded on nitrogen nucleus thereby producing new nuclei and a proton.
Student Name
Instructor
Date
Lab Objectives
In this lab you will:
• help the aliens, called Tinyians, build the best house on their planet called Tiny World.
• experiment with different building materials to collect data to see which ones best meet the criteria for building a home on Tiny World.
• test each building material for density, thermal and electrical conductivity, flexibility, and magnetism.
Background Research:
You will need to gather background research from the virtual lab to form a good hypothesis. Read the Welcome to Tiny World part of the lab. Use the background information you learn to answer the questions below.
Describe the gravity of Tiny World.
Part 1:
Describe the reason your house will need magnets.
Describe the climate of Tiny World.
Hypothesis:
In this section, include the IF/THEN statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
A If we use _______ to build the roof of the house, then the temperature inside the house will remain cooler.
B If we use_______ to build the walls and floors of the house, then the temperature inside the house will remain cooler.
C If we use ______ to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.
D If we use_______ to construct the latches on the windows and doors, then the magnetism will keep the latches secure.
Part 2
Procedure:
1. You will test each building material for density, thermal and electrical conductivity, flexibility, and magnetism.
2. Record your observations in the data table provided below.
3. Repeat steps with all test materials.
Data:
Record the results of each of your physical property tests in the table below.
Wood Clay Brick Iron Aluminum Copper Nickel
Flexibility
(?/10)
Magnetism
(number of paper clips)
Thermal Conductivity
(W/(m·K))
Electrical Conductivity
(x107 S/m)
Mass (g) 10g 10g 10g 10g 10g 10g
Volume (cm3)
Formula:
L x W x H
Density
(g/cm3)
Formula:
D=M/V
part 3
Conclusion
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
1 Using two to three sentences, summarize what you investigated and observed in this lab.
2 What was the independent variable in the lab?
3 What was the dependent variable in the lab?
4 Did each of your experiment results support, or fail to support your four hypotheses? A.
B
C.
D.
5 Why do you think a building material's density is important when building homes or architectural structures?
6 Why wouldn’t you choose wood or aluminum for the latches on your house?
7 Which material has the highest thermal conductivity?
8 Which material has the highest electrical conductivity
9 Based on your data, explain why these materials have the highest thermal and electrical conductivity?
10 Think about where you live now or where you have lived in the past; use complete sentences to describe this environment and the weather.
Answer:
The purpose of the "Measuring Physical Properties Lab Report" is to test the physical properties of different building materials in order to choose the most suitable materials for a new home in Tiny World. The lab objectives include helping the Tinyians build their best house, experimenting with different materials to collect data, and testing each material for density, thermal and electrical conductivity, flexibility, and magnetism.
The background research will provide information about Tiny World, including its gravity, climate, and other relevant details. The hypothesis section requires you to make IF/THEN statements based on the lab activity. For example, IF we use a certain material for the roof, THEN the temperature inside the house will remain cooler.
In part 2, the procedure involves testing each building material for density, thermal and electrical conductivity, flexibility, and magnetism. You need to record your observations in the data table provided.
In part 3, the conclusion should summarize the lab results and provide an interpretation of the results. It also includes answering questions about the independent and dependent variables in the lab, whether the experiment results support or fail to support the hypotheses, and explanations about the importance of density in building materials, why wood or aluminum wouldn't be suitable for latches, and which materials have the highest thermal and electrical conductivity.
Finally, you are asked to describe the environment and weather of a place you have lived in the past or currently live in, using complete sentences.
Hope this helps :)
Explanation:
<3