what is the difference in energy between the two levels responsible for the violet emmission line of the calcium atom at 422.7nm
Answers
The difference in energy between the two levels responsible for the violet emission line of the calcium atom at 422.7nm is 2.93 eV.
given that :
The photon wavelength , λ = 422.7 nm = 422.7 × 10⁹ m
the energy of photon is given as follows :
E = hc / λ
where
h = planck constant = 4.135 × 10⁻¹⁵eV.s
c = speed of the light = 3 × 10⁸ m/s
now, putting the values in the energy formula, we get :
E = hc / λ
E = ( 4.135 × 10⁻¹⁵eV.s × 3 × 10⁸ m/s ) / 422.7 × 10⁹ m
E = 2.93 eV.
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Related Questions
Ionic bonds form when electrons Group of answer choices are shared are transferred are captured by another atom's nucleus are excited
Answers
Answer: are transferred
Explanation:
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
Answer:
are transferred
Explanation:
i took the test earlier
How many grams of water will form if 10. 54 g h2 react with 95. 10 g o2? g h2o.
Answers
The balanced chemical equation for the reaction of H2 with O2 to form H2O is as follows:2H2 + O2 → 2H2OThe stoichiometric ratio of H2 and O2 in this reaction is 2:1. Therefore, for every 2 moles of H2, 1 mole of O2 is required. Let's start by calculating the number of moles of H2 and O2 present in the reaction.
Using the formula mass of H2 and O2 (i.e., 2 g/mol and 32 g/mol, respectively), we can calculate the number of moles of H2 and O2 in the reaction as follows:Number of moles of H2 = 10.54 g / 2 g/mol = 5.27 molNumber of moles of O2 = 95.10 g / 32 g/mol = 2.97 molWe can now use the mole ratio of H2 and O2 to determine which reactant is limiting. The mole ratio of H2 to O2 is 2:1, which means that 2 moles of H2 react with 1 mole of O2. Since we have 5.27 moles of H2 and only 2.97 moles of O2, O2 is the limiting reactant. This means that all of the O2 will be used up, and there will be some H2 left over after the reaction is complete.To calculate the amount of H2O formed in the reaction, we need to use the mole ratio of H2O to O2. According to the balanced chemical equation, 2 moles of H2O are formed for every mole of O2 consumed. Therefore, we can calculate the number of moles of H2O formed as follows:Number of moles of H2O = 2.97 mol O2 × 2 mol H2O/mol O2 = 5.94 mol H2OFinally, we can use the formula mass of H2O (i.e., 18 g/mol) to convert the number of moles of H2O to grams of H2O:Mass of H2O = 5.94 mol H2O × 18 g/mol = 106.9 g H2OTherefore, 106.9 grams of water will form if 10.54 g H2 reacts with 95.10 g O2.
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1 point
If you have 65.47g of donuts, and you know a box of donuts has 12 donuts in it and weights 25.64 g per box, how many donuts do you have?
Round your answer to a whole number.
Answers
\(65.47 \: g \times \frac{12 \: donuts}{25.64 \: g} = 30.64118565\)
\(i \: have \: 31 \: donuts\)
Answer:
30. 6 so 31 donuts
Explanation:
12d→ 25.64g
xd → 65.47g
SO cross multiply or 65.47g ÷ 25.64g. Which gives 2. 55g then divide by 12 to get 30.6 for X. If you want to check the answer substitute X with 31 and see if you get the 6547g
why is PLA plastic used for 3D printing?
(put in your own words)
Answers
Answer:
PLA is very user friendly that is stronger and stiffer than other materials. It melts easily and doesn't warp very often. Although it is very brittle, it still is a very popular material choice.
Explanation:
Laser pointed at a black paper is what type of energy dispersion, transmitted or opaque?
Answers
Dispersion types include chromatic, material, waveguide, and polarisation mode dispersion.
What is dispersion in the transmitted optical signal?The spreading out of a light pulse in time as it travels down the fibre is known as dispersion. Waveguide, material, and model dispersion are all types of dispersion in optical fibre. Below, each category is covered in more detail.White light dispersion occurs when white light passes through a glass prism and separates into its seven individual hues. The colours that are discernible include violet, indigo, blue, green, yellow, orange, and red.There are three types of dispersion in an optical medium, such fibre: chromatic, modal, and material. The emitter's spectral breadth causes chromatic dispersion. The number of various wavelengths that the LED or laser emits depends on its spectral width.To learn more about Dispersion refer to:
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How much energy is released if 58.2 grams of benzene is changed from a
liquid to a solid?
Answers
Answer:
28 js relased because it is what it is
6. Use the simulation to determine what the mass number and the atomic mass (amu) is for the isotope Fluorine-19.What is the biggest difference you see between the two numbers? Explain why these are different use the isotopes and mixtures simulation by phet
7. What is the percent compositions for nature's mix of lithium isotopes? What do you notice about the average atomic mass compare to the mass numbers for these same lithium isotopes? How does this relate back to how the average atomic mass is calculated.
Answers
Two stable isotopes of lithium, 6Li and 7Li, make up naturally occurring lithium; 7Li is the more prevalent of the two (92.5% natural abundance).
Explain about Isotopes?
The total amount of protons and neutrons in an atom makes up the mass number. A whole number, that is. The average number of protons and neutrons among an element's natural isotopes is known as the atomic mass. It has decimal form.
The total number of protons and neutrons in an isotope's nucleus is referred to as the mass number. This is due to the fact that each proton and neutron has a mass of one atomic mass unit (amu). You may get the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.
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Complete and balance the following half-reaction: no−3(aq)→no(g)(acidic solution)no3−(aq)→no(g)(acidic solution) express your answer as a chemical equation. identify all of the phases in your answer.
Answers
The balanced equation of the half-reaction in acidic conditions is:
NO₃⁻ (aq) + 4 H⁺ (aq) + 3 e- → NO (g) + 2 H₂O (l)What is the balanced equation of the half-reaction?The balanced equation of the half-reaction is determined as follows:
Half-reaction: NO₃⁻ → NO
Add electrons to the left-hand side to balance the charges and also add water to the right-hand side to balance the oxygen atoms:
NO₃⁻ + 4H⁺ + 3 e⁻ → NO + 2 H₂O
The reaction occurs in an acidic solution, so H⁺ ions are added to balance the charges.
NO₃⁻ (aq) + 4 H⁺ (aq) + 3 e- → NO (g) + 2 H₂O (l)
Therefore, the half-reaction is balanced and the phases are given.
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Select the net ionic equation for the reaction that occurs when sodium hydroxide and sulfuric acid are mixed. o No reaction occurs o 2Na+ (aq) + 2OH(aq) + 2H(aq) + SO2 (aq) → 2Na+ (aq) + SO, (aq) + 2 H2O(g) o H(aq) + OH(aq) → H2O
o H+(aq) + HSO4(aq) + 2OH- (aq) → 2 H2O(l) + SO4- (aq) o 2 Na+ (aq) +20H(aq) + 2H+ (aq) + S0,2-(aq) → 2 Na+ (aq) + SO42+ (aq) + 2 H2O(l) o 2 Na+ (aq) + SO42-(aq) → Na2SO4 (g)
Answers
The correct net ionic equation for the reaction that occurs when sodium hydroxide and sulfuric acid are mixed is H⁺(aq) + OH⁻(aq) → H₂O(l).
When sodium hydroxide (NaOH) and sulfuric acid (H₂SO₄) are mixed, they react to form water (H₂O) and sodium sulfate (Na₂SO₄). The balanced chemical equation for this reaction is:
2 NaOH(aq) + H₂SO₄(aq) → 2 H₂O(l) + Na₂SO₄(aq)
To find the net ionic equation, we need to separate all the aqueous species into their respective ions:
2 Na⁺(aq) + 2 OH⁻(aq) + 2 H⁻(aq) + SO₄²⁻(aq) → 2 H₂O(l) + 2 Na⁺(aq) + SO₄²⁻(aq)
Next, we can cancel out any spectator ions that appear on both sides of the equation. In this case, the sodium ions (Na⁺) and the sulfate ions (SO₄²⁻) are spectator ions. After canceling out the spectator ions, we are left with the net ionic equation:
2 OH⁻(aq) + 2 H⁻(aq) → 2 H₂O(l)
Simplifying the equation, we get:
H⁺(aq) + OH⁻(aq) → H₂O(l).
This is the correct net ionic equation for the reaction that occurs when sodium hydroxide and sulfuric acid are mixed.
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Once your kno3 is fully dissolved, will the actual concentration of your solution be somewhat higher or somewhat lower than the concentration you calculate? explain.
Answers
Once KNO3 is fully dissolved, the actual concentration of your solution may be somewhat lower than the concentration you calculate.
When you dissolve potassium nitrate (KNO3) in water, you assume that the solute and solvent mix uniformly to create a homogeneous solution. However, in practice, there may be some discrepancies that can cause the actual concentration to be lower than the calculated concentration.
1. Measurement errors: When measuring the mass of KNO3 or the volume of water, there can be slight inaccuracies due to the limitations of the measuring tools. These errors can cause the actual concentration to deviate from the calculated value.
2. Dissolution efficiency: While KNO3 generally dissolves well in water, it's possible that some small undissolved particles remain, leading to a lower actual concentration in the solution.
3. Temperature variations: The solubility of KNO3 depends on the temperature of the water. If the temperature during dissolution is not uniform, the actual concentration may not be the same as the calculated value.
4. Evaporation: If the container used to dissolve the KNO3 is not fully sealed, some water may evaporate during the dissolution process, causing the actual concentration to be lower than the calculated value.
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HELP WITH A THESIS STATEMENT
I basically need a thesis statement on how DNA analysis relates to chemistry. The only problem is that I'm having trouble making it 'arguable'. My ideas were:
-DNA analysis relates to chemistry because it applies that knowledge when analyzing the DNA samples left at crime scenes in order to identify the suspect.
-DNA analysis relates to chemistry because it's a subcategory of chemistry, also known as forensic chemistry, where DNA left at crime scenes is analyzed to potentially link a suspect to a crime.
Do either of these sound good and are they arguable? If not can you reword it to be?
Answers
The second thesis statement is perfect. It supports the claim and presents main idea.
How many electrons would Pd have if it had a +2 charge?_ How many electrons would Pd have if it had a +2 charge?
Answers
Answer:
80
Explanation:
W know that, the atomic no of lead (Pb) is 82. The no of protons is equal to the atomic no.
No of protons = 82
It has a charge of +2. It means that its lacks 2 electrons. No of electrons is :
e = 82-2
e = 80
Hence, Pd will have 80 electrons now.
Which solution has the highest boiling point?
1.0 M KNO3
2.0 M KNO3
1.0 M Ca(NO3)2
2.0 M Ca(NO3)2
Answers
First off, the greater the charge on your ions, the stronger the ion-dipole forces are between the ions and water molecules in solution. Ca2+ has a greater charge than K+. Also, the more concentrated the solution, the more ions you have, and therefore more ion-dipole forces overall. The stronger the intermolecular forces are, the higher the boiling point.
The highest boiling point has been of 2.0 M \(\rm Ca(NO_3)_2\). Thus, option D is correct.
The boiling point has been the temperature at which the liquid starts to be converted to the gases. The boiling point has been higher when the inter-molecular forces between the molecules are higher.
With high inter-molecular forces, there has been higher amount of energy required to break the bonds, and change the state. The boiling point has also been dependent on the concentration, as higher the molecules present, there has been higher bonds, and more energy is required.
The Ca molecules has charge +2, while K has +1, this states, the stronger bonding of Ca with nitrate as compared to the K. Thus, calcium nitrate solution of 2 M has requires more energy, and thus have the highest boiling point.
The highest boiling point has been of 2.0 M \(\rm Ca(NO_3)_2\). Thus, option D is correct.
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explain about brownian movement in your own word
Answers
Answer:
Brownian moment means zig-Zag motion of particals Randomly anywhere in the free space or in fluids
estimate the boiling point of a 2m solution of nacl in water.
Answers
The boiling point of a 2m solution of nacl in water is >100 °C. The boiling point elevation formula may be used to calculate the boiling point of a 2 M solution of NaCl in water.
Tb = Kb x m, where Kb is the boiling point elevation constant for water. >100 °C (Since the boiling point for water is 100 °C, we would expect for the boiling point of the aqueous solution to be greater than 100 °C.) which is 0.52 K kg/mol. Because the molality of a 2 M solution of NaCl is 2 mol/kg, the anticipated change in boiling point is: Tb = 0.52 K kg/mol multiplied by 2 mol/kg = 1.04 K Because the average boiling point of pure water is 100 °C (at 1 atm), the anticipated boiling point of the 2 M NaCl solution in water is:Temperature at which water boils The boiling point elevation formula may be used to calculate the boiling point of a 2 M solution of NaCl in water. Tb = Kb x m, where Kb is the boiling point elevation constant for water. the boiling point of a 2m solution of nacl in water.
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The complete question is:
Estimate the boiling point of a 2M solution of NaCl in water.
A. 100 °C
B. >100 °C
C. <100 °C
A scientist wants to study the diversity of soil bacteria found during different months of the year A.what is her independent variable B.what will be her dependent variable
Answers
Answer:
No se ingles te ayudaria pero no entiendo nada
The independent variable in this study is different months that is changing the dependent variable is the diversity of soil bacteria.
What is dependent variable ?In an experiment, there are two types of variables namely, dependent and independent variables. The dependent variables are those which depends on the other variables and changes with them. These variables cannot be controlled by the experimenter and this is under study.
Independent variables are variables independent of all other variables which we can be changed to study the change in dependent variables.
Here, what the scientist is to be studied is diversity of soil bacteria.
Hence, diversity is the dependent variable. The independently changing variables are the different months. They are the independent variables.
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If we dissolve 38 g of salt in 239 g of water, what is the mass of the resulting solution?
Answers
pls check for me !! thank you.
Answers
Answer:
52 mL of H₂O.
Explanation:
The balanced equation for the reaction is given below:
2H₂ + O₂ —> 2H₂O
From the balanced equation above,
2 mL of H₂ reacted with 1 mL of O₂ to produce 2 mL of H₂O.
Finally, we shall determine the volume of H₂O that will be produced by the reaction of 52 mL of H₂ at the same temperature and pressure.
This can be obtained as follow:
From the balanced equation above,
2 mL of H₂ reacted to produce 2 mL of H₂O.
Therefore, 52 mL of H₂ will also react to produce 52 mL of H₂O.
Thus, 52 mL of H₂O were obtained from the reaction.
If a student performs a lab and is trying to find the boiling point (273K) of water and gets the following results:
Sample 1= 350K
Sample 2= 349 K
Sample 3= 350 K
Sample 4= 348K
Sample 5 349K
How would you describe his results?
Answers
The student's measurement of the boiling point of water can be described as inaccurate but precise.
What is accuracy and precision?Accuracy is the degree of conformity of a measure to a true or standard value i.e. the closeness to a true or standard value.
On the other hand, precision is the ability of a measurement to be reproduced consistently i.e. closeness of measured values.
According to this question, a student performs a lab and is trying to find the boiling point (273K) of water but gets the close measured values above.
This suggests that the student's measurement are not accurate because they are not close to the standard value (273K) but are precise because they are close to one another.
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is riding a bike or bus quicker way to get to school?
IV:_____________
DV:____________
Hypothesis:________________________________________________
Answers
My science exam is due tomorrow and I HAVE LIMITED TIME. can someone help me how to absorb anything you read and memorize it...
Answers
Answer:
It won't let me type this for some reason but here it is.
What is the molar solubility of NiCO3 in a solution with equilibrium [NH3] = 0.24 M? Ksp of NiCO3 = 1.42e−7; Kf of [Ni(NH3)6]2+ = 1.02e8.
A. 0.24 M
B. 1.8M
C. 7.6M
D. 0.053 M
E. 0.45 M
Answers
The molar solubility of NiCO3 in a solution with equilibrium [NH3] = 0.24 M is 0.053 M.
Explanation :
What is the molar solubility of NiCO3?
The molar solubility of NiCO3 in a solution with equilibrium [NH3] = 0.24 M is 0.053 M.
Now, we'll determine the values of the equilibrium constants Ksp and Kf of [Ni(NH3)6]2+.
The solubility product expression of NiCO3 is as follows:
Ksp = [Ni2+] [CO32-] = 1.42 x 10^-7M
Since one mole of NiCO3 produces one mole of Ni2+ and one mole of CO32-, the concentrations of Ni2+ and CO32- are equal to each other, and x:
Molar solubility of NiCO3 = [Ni2+] = [CO32-] = x
The formation constant of [Ni(NH3)6]2+ is as follows:
Kf = [Ni(NH3)62+] / [Ni2+] [NH3]6
Here, the stoichiometry of Ni2+ and NH3 in the complex ion is 1:6.
So, [NH3] = 6x and [Ni(NH3)62+] = x
The equilibrium constant expression of the complex ion is:
Kf = [Ni(NH3)62+] / [Ni2+]. [NH3]6 = x / (x) (6x)6 = 1.02 x 10^8M^-6
On simplifying,
we get:
x3 = Ksp / Kf = 1.42 x 10^-7M / (1.02 x 10^8M^-6) = 1.39 x 10^-15M^7x = 0.053 M
Therefore, the molar solubility of NiCO3 in a solution with equilibrium [NH3] = 0.24 M is 0.053 M.
So, the correct answer is D. 0.053 M.
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How is a rainbow made
Answers
Atoms tend to form compounds because they have an unstable number of ___
A. Protons
B. Isotopes
C. Valence electrons
D.neutrons
Answers
(q028) sulfuric acid speleogenesis group of answer choices happens most often above the water table. occurs where limestone overlies strata rich in hydrocarbons. is responsible for the vast majority (greater than 80%) of all caves. occurs when microbes convert hydrogen sulfide gas into gypsum.\
Answers
Sulfuric acid speleogenesis occurs where limestone overlies strata rich in hydrocarbons, the correct option is D.
Sulfuric acid speleogenesis is the process of cave formation that occurs due to the dissolution of limestone by sulfuric acid. In this process, hydrocarbons are oxidized to produce sulfuric acid, which reacts with the limestone to dissolve it, leading to the formation of caves. This process is responsible for the formation of some of the largest caves in the world, such as Carlsbad Caverns in New Mexico and Mammoth Cave in Kentucky.
Sulfuric acid speleogenesis typically occurs in areas where hydrocarbons are present in the underlying rock layers, such as in oil-rich regions. It can also occur in areas where coal or other carbon-rich materials are present, the correct option is D.
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The complete question is:
Sulfuric acid speleogenesis:
Choose one:
A. occurs when microbes convert hydrogen sulfide gas into gypsum.
B. happens most often above the water table.
C. is responsible for the vast majority (greater than 80%) of all caves.
D. occurs where limestone overlies strata rich in hydrocarbons.
what are the names given to each part of the picture indicated above
Answers
during conduction heat is transferred by the movement of currents within a fluid true or false
Answers
Answer:
True i think
Explanation:
Answer:
Yes
Explanation:
Water is an example because heat touches the bottom of the sea without being nullified
Which phrase refers to the repeating pattern of a mineral's particles?
solid structure
crystal structure
O organic structure
inorganic structure
hellppp!!
Answers
Answer:
Crystal Structure
Explanation:
Hope this helps :)
Answer:
B. AKA crystal structure
Explanation: I got it right on the test
PLEASE HELP ASAPPPPPPPPPPP!!!!!!!!!!!!!!1
Electric Energy Net Generation by Resource (as of 2007)
Resource Percentage
coal 48.5
natural gas 21.6
uranium 19.4
hydroelectric 5.8
petroleum 1.6
biomass about 1.0
geothermal <1.0
solar and other <1.0
wind <1.0
other gases 0.3
What percentage of energy generation is produced by fossil fuels?
Answers
Answer:
63%
Explanation:
About 63% of this electricity generation was from fossil fuels—coal, natural gas, petroleum, and other gases. About 20% was from nuclear energy, and about 18% was from renewable energy sources.
Hope this helped you!
Answer:
\(71.7\%.\)
\(Coal, \: crude \: oil, \: and \: natural \: \\ gas \: are \: all \: considered \: fossil \: fuels \\ coal \: 48.5 \\ natural \: gas \: 21.6 \\ petroleum \: 1.6
\)
\(the \: sum \: of \: the \: three \:: \\ (48.5+ 21.6+ 1.6) = 71.7.\)
PLEASE HURRY
Calculate the number of oxygen atoms in a 130.0 g sample of forsterite (Mg₂SiO4).
Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.
Answers
Answer:
5.562×10^23
Explanation:
MgSiO4
moles=mass/molar mass
=130.0g/140.7
=0.9240
times by avagadros number to get the number of paricles
A=6.02×10^23
× 0.9240
= 5.562 ×10^23 particles
1 oxygen componinent therefore stays same