Chemistry College
Answers
Answer 1
The question is incomplete, the complete question is;
The energy E of the electron in a hydrogen atom can be calculated from the Bohr formula: =E−Ryn2 In this equation Ry stands for the Rydberg energy, and n stands for the principal quantum number of the orbital that holds the electron. (You can find the value of the Rydberg energy using the Data button on the ALEKS toolbar.) Calculate the wavelength of the line in the emission line spectrum of hydrogen caused by the transition of the electron from an orbital with =n10 to an orbital with =n8. Round your answer to 3 significant digits.
Answer:
162 * 10^-7 m
Explanation:
The Rydberg formula is;
1/λ= R(1/n2^2 - 1/n1^2)
R = Rydberg constant = 1.097 * 10^7 m-1
n2 = final state of the electron = 8
n1 = initial state of the electron = 10
Substituting values;
1/λ= 1.097 * 10^7(1/8^2 - 1/10^2)
1/λ= 1.097 * 10^7(1/64 - 1/100)
1 / λ = 1.097 10⁷ (0.015625 - 0.01)
1 /λ = 0.006170625 10⁷
λ = (0.006170625 10⁷)^-1
λ = 162 * 10^-7 m
Related Questions
List the three different temperature scales
Answers
Answer:
Celcius
Farenheit
Kelvin
Explanation:
What force is required to accelerate a car at a rate of 4 m/s2 if the car has a mass of 37.5 kg?
Answers
Answer:150
Explanation:I think because f=MxA and the mass is 37.5 kg while acceleation is 4 m/s^2 and when you multiply that is gets 150 so F=150 N
What volume of concentrated nitric acid (15.0 M) is required to make 100 mL of a 3.0 M nitric acid solution?
Answers
The answer to the question is 5
Answer: 50.mL
Explanation:
honestly not really sure found it on quizlet!
How can the difference between a covalent bond, a polar covalent bond, and an ionic bond be categorized using the concept of electronegativity?
Answers
Answer: If the ΔEN is between 1.6 and 2.0 and if a metal is involved, then the bond is considered ionic. If only nonmetals are involved, the bond is considered polar covalent.
Explanation:
Based on the kinetic theory, which statement is true?
Matter consists of only large molecules.
Matter is made up of only charged particles.
The particles of matter are in constant motion.
The particles of matter have zero kinetic energy.
Answers
3. The particles of matter are in constant motion. Hope it helps!
Answer: the particles of matter are in constant motion
took the test
Consider the following reaction.
2Fe2O3(s)+3C(s)−→−heat4Fe(s)+3CO2(g)
Calculate the number of grams of Fe2O3 needed to react with 13.0 g C.
!?!?!?!
Answers
Answer:
Number of moles of C = 13.0 g / 12.0107 g/mol = 1.08 mole
From the balanced equation we can say that
3 mole of C requires 2 mole of Fe2O3 so
1.08 mole of C will require
= 1.08 mole of C *(2 mole of Fe2O3 / 3 mole of C)
= 0.720 mole of Fe2O3
mass of 1 mole of Fe2O3 = 159.69 g so
the mass of 0.720 mole of Fe2O3 = 115 g
Therefore, the mass of Fe2O3 produced would be 115 g
Why is the conjugate acid of morpholine more acidic than the conjugate acid of piperidine? Why is the conjugate acid of morpholine more acidic than the conjugate acid of piperidine? The oxygen in morpholine withdraws electrons inductively, which makes protonated morpholine the stronger acid. The oxygen in morpholine does not withdraw electrons inductively, which makes protonated morpholine the stronger acid. The sp2 oxygen in morpholine is less electronegative than the sp2 carbon of piperidine, which makes protonated morpholine the stronger acid. The sp2 oxygen in morpholine is more electronegative than the sp2 carbon of piperidine, which makes protonated morpholine the stronger acid.
Answers
Answer:
The oxygen in morpholine withdraws electrons inductively, which makes protonated morpholine the stronger acid.
Explanation:
In Chemistry, acidity has to do with ease with which hydrogen ion is lost from a substance. Hence in a substance that has greater acidity, hydrogen ion is easily lost as a proton. This easy loss of hydrogen ion is usually caused by a particular reason which is related to the structure of the substance.
In comparing the acidity of protonated morpholine and piperidine, we find out that morpholine has an oxygen atom which withdraws electrons inductively thereby making the N-H bond in protonated morpholine weaker and enhances the loss of a hydrogen ion in protonated morpholine as a proton.
Please answer and explain the question in the image
Answers
Answer:
7598 J
Explanation:
Solid ice has a specific heat capacity that is different from that of liquid water. The value of that is not given here, so we will assume that "liquid ice" has the same specific heat as liquid water.
The heat liberated by cooling 14 g of water from 30°C to -20°C is ...
(4.184 J)/(g·K)×(14 g)×(30-(-20))K = 2928.8 J
The mass 14 g of water in moles is ...
(14 g)/(18.01528 g/mol) ≈ 0.77712 mol
The heat of fusion (converting liquid water to "liquid ice") is then ...
(6.008 kJ)/mol × 0.77712 mol = 4668.9 J
So, the total amount of heat liberated by the change in temperature and form is ...
2928.8 J +4668.9 J ≈ 7598 J
If a,b,c are in AP & x, y, z are in GP, prove that: x^(b-c).y^(c-a).z^(a- b) = 1
I will report if wrong.
Answers
Answer:
b
Explanation:
b) How many kilojoules of heat will be released by the combustion of 22.52 g of this liquid at
constant pressure?
C2H5OH burning in a simple alcohol lamp is -1277.3kJ/mol
Answers
Answer:
Explanation:
You realize that C2H5OH releases -1277.3kJ/mol. We need to convert this to the amount based on the question. We that 22.52g of C2H5OH = 0.48884 mol.
This means that it will release (-1277.3)(0.48884) = 624.40 KJ of heat will be released. Note the negative sign is not necessary here (I think) because it says how much is released and not the change in heat of the system so it should be positive.
Identifying Short-Term Changes
Egrets are birds that walk into the shallow waters of
marshes and wetlands to catch fish and insects with
their long beaks.
Which short-term environmental change is most likely
to directly affect a population of egrets along the coast
of Florida?
Odrought
O earthquake
O forest fire
Answers
Answer:
drought
Explanation:
on edge 2021
Answer:
drought
Explanation
its right on edge
What is the main difference between rain and hail?
Answers
Answer:
Rain is a liquid and hail is a solid.
If 10.00 moles of copper are reacted with 6.00 moles of sulfur according to the following balanced equation, which reactant is the limiter and how many moles of excess reactant would remain after the reaction is completed? 2 Cu + S --> Cu2S
Cu is limiting and 1.00 mole of excess S remain
S is limiting and 1.00 moles of excess Cu remain
S is limiting and 4.00 moles of excess Cu remain
Cu is limiting and 4.00 moles of excess S remain
Answers
Answer: Cu is limiting and 1.00 mole of excess S remain
Explanation:
The chemical balanced reaction is:
[tex]2Cu+S\rightarrow Cu_2S[/tex]
According to stoichiometry :
2 moles of [tex]Cu[/tex] require 1 mole of [tex]S[/tex]
Thus 10.00 moles of [tex]Cu[/tex] will require=[tex]\frac{1}{2}\times 10.00=5.00moles[/tex] of [tex]S[/tex]
Thus [tex]Cu[/tex] is the limiting reagent as it limits the formation of product and [tex]S[/tex] is the excess reagent.
Moles of S left = (6.00-5.00) moles = 1.00 mole
Thus Cu is limiting and 1.00 mole of excess S remain.
On analysis of 3.4 mg of an organic compound, 8.03 g of CO2 and 3.34 g of H2O were obtained. The percentage composition of carbon and hydrogen in the compound are.......................... respectively
Answers
Answer: The percentage composition of carbon and hydrogen in the compound are 64.4 % and 10.9 % respectively
Explanation:
Mass of [tex]CO_2[/tex] = 8.03 g
Mass of [tex]H_2O[/tex]= 3.34 g
Molar mass of carbon dioxide = 44 g/mol
Molar mass of water = 18 g/mol
For calculating the mass of carbon:
In 44g of carbon dioxide, 12 g of carbon is contained.
So, in 8.03 g of carbon dioxide, =[tex]\frac{12}{44}\times 8.03=2.19g[/tex] of carbon will be contained.
For calculating the mass of hydrogen:
In 18g of water, 2 g of hydrogen is contained.
So, in 3.34 g of water, =[tex]\frac{2}{18}\times 3.34=0.371g[/tex] of hydrogen will be contained.
Mass of oxygen in the compound = (3.4) - (2.19+0.371) = 0.839 g
percent composition of C =[tex] \frac{\text{mass of C}}{\text{ Total mass}}\times 100= \frac{2.19}{3.4}\times 1000=64.4\%[/tex]
percent composition of H =[tex] \frac{\text{mass of H}}{\text{ Total mass}}\times 100= \frac{0.371}{3.4}\times 1000=10.9\%[/tex]
Thus the percentage composition of carbon and hydrogen in the compound are 64.4 % and 10.9 % respectively
copper
A. Element
B. Compound
C.hom*ogeneous Solution
D. Heterogeneous
Answers
Answer:
A ) Element
Explanation:
cooper is an element
What is the molarity of a solution containing 49.0 g of sulfuric acid, H2SO4,
in 3.00 liters of solution? Answer with 3 sig figs.
Answers
Molarity = moles of solute/volume of solution in liters.
Our solute here is sulfuric acid, of which we have 49.0 g. The number of moles of sulfuric acid is (49.0 g)/(98.079 g/mol) = 0.4996 mol H2SO4. To obtain the molarity of this solution of sulfuric acid, we divide 0.4996 mol H2SO4 by 3.00 L, which gives us 0.167 M H2SO4 (answer given to three sig figs).
number of atoms per unit cell in face centred cube is
Answers
Answer: 4 atoms is the answer. I hope it helped you.
Explanation:
Be sure to answer all parts. Write the unbalanced chemical equation to represent each of the following reaction statement. Do not include phase abbreviations. (a) Potassium hydroxide and phosphoric acid react to form potassium phosphate and water. (b) Zinc and silver chloride react to form zinc chloride and silver. (c) Sodium hydrogen carbonate reacts to form sodium carbonate, water, and carbon dioxide. (d) Ammonium nitrite reacts to form nitrogen and water. (e) Carbon dioxide and potassium hydroxide react to form potassium carbonate and water.
Answers
Answer:
See explanation
Explanation:
An unbalanced chemical equation does not show equal number of atoms of each element on both sides of the reaction equation.
a) KOH + H3PO4 -----> K3PO4 + 3H20
b) Zn + AgCl -------> ZnCl2 + Ag
c) NaHCO3 → Na2CO3 + H2O + CO2
d) NH4NO2 ------> N2 + H2O
e) CO2 + KOH -----> K2CO3 + H2O
A chemist has 60ml of a 3M NaCl solution. He needs to dilute it so the Molarity is 1M NaCl. How much water does he need to add?
Answers
Answer:
80 ml the right answer
Explanation:
Hope it helps you dude
c) If 21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will be produced?
Answers
Explanation:
21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will be produced
Given the following set of data from the decomposition of hydrogen peroxide,
how is the initial rate of the reaction (between time 0 and 300 seconds)
different from the rate of the reaction between 1800 and 3000 seconds?
[H202 M
Time (s)
2.0
0
1.6
300
1.4
600
1.1
1200
0.72
1800
0.15
3000
Answers
Answer:
what it mean I don't know
Radioactive materials decay by a first-order process. The rate constant for the decay of an isotope whose half-life is 7.69 years is
Answers
Answer:
k = 0.0901 yrs⁻¹
Explanation:
1st order decay is defined by the equation A = A₀e^-k·t. If A = A₀/2 and t represents the 1st half-life of the isotope then ...
t(1/2) = ln2/k = 0.693/k => k = 0.693/t(1/2) = 0.693/7.69yrs = 0.0901 yrs⁻¹
In the solution containing both 0.10 M acetic acid and 0.10 M sodium acetate, the acetic acid undergoes ionization. The chemical equation for this ionization reaction is the same as for a solution containing acetic acid alone. The difference is that the initial concentration of acetate ion (before any ionization reaction occurs) for the solution containing acetic acid alone is zero, whereas the initial concentration of acetate ion is 0.10 M in your solution containing both acetic acid and sodium acetate. Calculate the percent ionization and the expected initial pH for the solution that contained both 0.10 M acetic acid and 0.10 M sodium acetate. (Hint: Again, you will need to use Ka for acetic acid.)
Answers
Answer:
percent ionization = 50.01%; pH = 4.75
Explanation:
To solve this question we must write the acetic acid equilibrium (Where HX will be acetic acid and X⁻ the sodium acetate):
HX(aq) ⇄ H⁺(aq) + X⁻(aq)
Where equilibrium constant, Ka, is defined as:
Ka = 1.76x10⁻⁵ = [H⁺] [X⁻] / [HX]
Where the concentration of each ion is:
[H⁺] = X
[X⁻] = 0.10M + X
[HX] = 0.10M - X
Replacing in Ka expression:
1.76x10⁻⁵ = [X] [0.10-X] / [0.10+X]
1.76x10⁻⁶ + 1.76x10⁻⁵X = 0.10X - X²
X² - 0.0999824 X + 1.76×10⁻⁶ = 0
X ≈ 0.1M → False solution. Decreases a lot the concentration of HX
X = 0.0000176M → Right solution.
The concentration of each ion is:
[H⁺] = 0.0000176062M
[X⁻] = 0.10M + 0.0000176M = 0.1000176M
[HX] = 0.10M - 0.0000176M = 0.0999824M
Percent ionization:
[X-] / [X-] + [HX] * 100 =
0.1000176M / 0.2M =
50.01%
And pH = -log [H+]
pH = 4.75
As you can see, [H+]≈ Ka
Food Energy Math
For this assignment you will have to calculate the food energy required to power various devices. You will be required to select 5 foods you have at your home and calculate how many of each item will be required to perform each mechanical or electrical process. Remember to calculate the per item calories; a serving of 2 chocolate sandwich cookies is 80 calories, one sandwich cookie is 40 calories.
For example, a coffee maker will require about 400 Watts of energy to run for an hour. 1 Kilocalorie is equal to 1.163 Watts, so the coffeemaker will require 343.9 Kilocalories to run for this length of time. If it could be converted to electricity how many fastfood cheeseburgers, (417 calories) would that require? Only 1 cheeseburger
Conversions:
1 Kcal- 1.163 Watts per hour
31,500 Kcal – 1 Gallon of gasoline
Answers
Answer:
https://courses.lumenlearning.com/cheminter/chapter/energy-in-food-and-nutrition/
Explanation:
Dust and particulates released in the home may cause
Lung cancer
Increased allergies and respiratory problems
Nausea
Answers
Answer:
b) increased allergies and respiratory problems.
Explanation:
i hope this helps!
have a great rest of your day!
please consider giving brainliest :)
Answer:
Human health effects of dust relate mainly to the size of dust particles. Dust may contain microscopic solids or liquid droplets that are small enough to get deep into the lungs and cause serious health problems. Large particles may irritate the nose, throat and eyes. ... Dust from soil can irritate the respiratory tract.
b. increased allergies and respiratory problems
Helppppppp :))))))
:/
Answers
Answer:
Cool Super giants
Explanation:
Brainlist Tho???
a. Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,ℓ,mℓ,ms).
Check all that apply.
3,1,-1,1/2
1,1,0,1/2
1,-1,-1,-1/2
2,1,-1,-1/2
3,0,0,1/2
0,2,1,-1/2
3,2,1,-1
4,3,3,-1/2
3,2,2,1/2
3,3,-1,1/2
4,3,-4,1/2
2,2,1,1/2
b. Consider the addition of an electron to the following atoms from the fifth period. Rank the atoms in order from the most negative to the least negative electron affinity values based on their electron configurations.
Atom or ion Electron configuration
I [Kr]4d105s25p5
Sn [Kr]4d105s25p2
Xe [Kr]4d105s25p6
Required:
Rank the electron affinity from most negative to least negative. To rank items as equivalent, overlap them.
Answers
Answer:
a. Values are - (1) 3,1,-1,1/2 (2) 2,1,-1,-1/2 (3) 3,0,0,1/2 (4) 4,3,3,-1/2
(5) 3,2,2,1/2
b. Order be- I > Sn > Xe
Explanation:
a.
Valid quantum numbers are -
'l' value should be less than 'n' value and 'ml' value should be '-l' to 'l'
'ml' value should not more than 'l' or 'n'.
Values are -
3,1,-1,1/2
2,1,-1,-1/2
3,0,0,1/2
4,3,3,-1/2
3,2,2,1/2
b.
Given that-
I [Kr]4d¹⁰5s²5p⁵
Sn [Kr]4d¹⁰5s²5p²
Xe [Kr]4d¹⁰5s²5p⁶
Order be-
I > Sn > Xe
Xe is least because it is completely filled outer shell (5s²5p⁶
The average atomic mass of an element does not account for naturally
occurring isotopes.
True
False
Answers
Answer:
true
Explanation:
cffffyifuducxirrtkdyfufiuruhoy
True jfjsjsjdjdjfjfnfn BBC bchfhdjd it
How many atoms would fit across a human hair? *
Answers
A typical human hair is about 1 million carbon-12 atoms just in width
The amount of atoms one million carbon atoms or so make up an average human hair.
What are atoms?
The smallest unit of matter that may be divided without ejecting electrically charged particles is called an atom. It is also the smallest material with properties resembling chemical elements. As a result, the atom serves as the fundamental unit of chemistry. In a chemical reaction, atoms cannot be formed or destroyed since they are indivisible units.
One inch has 25,400,000 nanometers. The width of a human hair ranges between 80,000 and 100,000 nanometers. The thickest human hair is a million times smaller than an atom. An atom's diameter spans from 0.1 to 0.5 nanometers. The volume of the cells is typically 0.009 cubic microns. More than 150,000 of these germs could fit on the tip of a human hair, and about 150 of them could fit within one Escherichia coli cell.
Thus, the amount of atoms one million carbon atoms or so make up an average human hair.
To learn more about atoms, refer to the link below:
https://brainly.com/question/29695801
#SPJ2
please help if you know all 4
Answers
Answer:
1. lobster
3. Two parts of skeleton meet.
