Answer:
An X-ray photon of wave length 0.989 nm strikes a surface. The emitted electron has a kinetic energy of 969 eV. What is the binding energy of the electron in kJ/mol? [KE=
1
2
mv2;1 electron volt (eV)=1.602×10−19J][KE=
2
1
mv
2
;1 electron volt (eV)=1.602
The binding energy of the emitted electron is 5.48 x 10⁻²⁰ kJ/mol.
The given parameters;
wavelength of the photon, λ = 0.954 nm = 0.954 x 10⁻⁹ m.kinetic energy of emitted photon, K.E = 959 eVThe binding energy of the electron is calculated as follows;
from Einstein's mass defect equation
[tex]\Delta E = \Delta mc^2\\\\[/tex]
Also, from Einstein's photo-electric equation;
E = φ + K.E
where;
φ is the binding energy of the electron on the metal surface
The energy of one mole of electron the emitted is calculated as;
[tex]E = hf = h\frac{c}{\lambda} \\\\E = \frac{(6.626 \times 10^{-34}) \times (3\times 10^8)}{0.954 \times 10^{-9}} \\\\E = 2.084 \times 10^{-16} \ J[/tex]
The kinetic energy of the emitted electron in Joules is calculated as;
K.E = 959 x 1.602 x 10⁻¹⁹ J
K.E = 1.536 x 10⁻¹⁶ J
The binding energy of the electron is calculated as;
φ = E - K.E
φ = 2.084 x 10⁻¹⁶ J - 1.536 x 10⁻¹⁶ J
φ = 5.48 x 10⁻¹⁷ J
φ = 5.48 x 10⁻²⁰ kJ/mol
Thus, the binding energy of the emitted electron is 5.48 x 10⁻²⁰ kJ/mol
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Create a graphic organizer describing types of substances including the difference between pure substance and mixture with subtypes and examples.
SCAM ANSWERS WILL BE DELETED.
If you answer this seriously I will P.A.y.P.a.l you 2 dollars. just leave them in the comments of your answer
Answer:
Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures.
Explanation:
If a gas is cooled from 315 K to 231 K, what was its initial pressure if its final pressure is 625 torr?
Answer:
The initial pressure was 852.27 torr.
Explanation:
Given that,
Initial temperature, T = 315 K
Final temperature, T' = 231 K
Final pressure, P' = 625 torr
We need to find the initial pressure of the gas. We know that, the relation between pressure and temperature is given by :
[tex]\dfrac{P}{P'}=\dfrac{T}{T'}\\\\P=\dfrac{P'T}{T'}\\\\P=\dfrac{625\times 315}{231}\\\\P=852.27\ torr[/tex]
So, the initial pressure was 852.27 torr.
Balance the equation
CsOH + Fe2(SO3)3 —>
Fe(OH)3 + Cs2SO3
6 CsOH + Fe2(SO3)3 = 2 Fe(OH)3 + 3 Cs2SO3
bank reconciliation statement , teacher , explain.
Answer:
A bank reconciliation statement is a summary of banking and business activity that reconciles an entity's bank account with its financial records. A bank reconciliation statement is a useful financial internal control tool used to thwart fraud.
Which of the following gases effuses most rapidly?
(Atomic mass of : H = 1 g/mol, C = 12 g/mol , N = 14 , g/mol , O = 16 g/mol , Cl = 35.5 g/mol )
a.
hydrogen chloride
b.
nitrogen
c.
carbon monoxide
d.
ammonia
e.
oxygen
Answer:
C. Carbon monoxide
This is my answer tell me if wrong
Ammonia among all the gases effuses most rapidly. Therefore, the correct option is option d.
A gas can escape or flow through a small aperture into a vacuum or a region with lower pressure through a process called effusion. It is a specific kind of gas flow that takes place in those circumstances. The square root of a gas's molar mass has an inverse relationship with the rate of effusion of that gas. The gas will effuse more quickly the lower the molar mass.
The molar mass are calculated as:
a. hydrogen chloride (HCl): H (1 g/mol) + Cl (35.5 g/mol) = 36.5 g/mol
b. nitrogen (N2): N (14 g/mol) + N (14 g/mol) = 28 g/mol
c. carbon monoxide (CO): C (12 g/mol) + O (16 g/mol) = 28 g/mol
d. ammonia (NH3): N (14 g/mol) + H (1 g/mol) + H (1 g/mol) + H (1 g/mol) = 17 g/mol
e. oxygen (O2): O (16 g/mol) + O (16 g/mol) = 32 g/mol
The square root of the molar masses are given as:
a. √36.5 ≈ 6.04
b. √28 ≈ 5.29
c. √28 ≈ 5.29
d. √17 ≈ 4.12
e. √32 ≈ 5.66
Ammonia has the lowest molar mass and hence the fastest effusion rate of all the gases.
Therefore, the correct option is option d.
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what was his early childhood of Edwin Powell Hubble?
Explanation:
Edwin Powell Hubble was raised in Marshfield, Massachusetts, the child of an insurance officer. While Edwin Powell Hubble became 10 years old, he alongside his 7 brothers and sisters moved to Chicago, alongside their family. Edwin Powell Hubble graduated elementary school around and succeeded in athletics, especially track and field, breaking the Illinois school long jump records as a high school senior.
Calculate the mass in grams of a 1.070 mole of acetylene ,C2H2
Answer:
27.86x10^-3 Kg
Explanation:
Hi! To get the result you only need to use this formula: m = n x M <=> m = 1.070 x ((2x12.01 + 2x1.01) x 10^-3) = 27.8628 x 10^-3 Kg. Hope it helped!
4 grams of N is how many moles of N?
Answer:
0.285577616426424
Explanation:
Hope this helps!
A balloon with an initial volume of 3.5 L at a temperature of 296 K is warmed to 376 K
What is its volume at 376 K?
Answer:
4.4 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 3.5 L
Initial temperature (T₁) = 296 K
Final temperature (T₂) = 376 K
Final volume (V₂) =?
The final volume of the balloon can be obtained by using the Charles law equation as illustrated below:
V₁ / T₁ = V₂ / T₂
3.5 / 296 = V₂ / 376
Cross multiply
296 × V₂ = 3.5 × 376
296 × V₂ = 1316
Divide both side by 296
V₂ = 1316 / 296
V₂ = 4.4 L
Thus, the final volume of the balloon is 4.4 L
When the gas shown in the Energy Distribution diagram is heated to "T2," what has happened?
Select all that apply.
The average kinetic energy has lowered.
The average kinetic energy has increased.
o The highest energy level has decreased.
Less molecules have a higher energy level.
More molecules have a higher energy level.
Answer:
The average kinetic energy has increased. More molecules have a higher energy level.
Explanation:
I so esay
How many elements of oxygen are present in the molecule below 3Ca(OH)2
Answer:
Two elements of oxygen are presented.
How many liters of 3.0 MNAOH solution will react with 2.4 mole H2 S04
Why should you prefer dry-ashing to wet-ashing of a food sample such as
cabbage?
Calculate the amount (in moles) of magnesium in 1.23 g.
Answer
0.32 is that answer
Explanation:
you just use the calculator
Find the empirical formula of copper oxide.
Answer:
The empirical formula of the oxide is CuO
Explanation:
Copper(II) oxide or cupric oxide is the inorganic compound with the formula CuO
How do autotrophs and heterotrophs relate to the carbon cycle?
Answer:
Autotrophs store chemical energy in carbohydrate food molecules they build themselves. Most autotrophs make their food through photosynthesis using the energy of the sun. Heterotrophs cannot make their own food, so they must eat or absorb it.
What's the partial pressure of hydrogen in a gas mixture if its mole fraction is 0.1 and the total pressure is 325 torr?
Question 15 options:
325 torr
32.5 torr
100 torr
65 torr
How many moles of ethyl alcohol, C2H5OH, are present in 65 mL of a 1.5 M
?solution
Answer:
How many moles of ethyl alcohol, C2H5OH, are present in 65 mL of a 1.5 M
?solution
Explanation:
How many moles of ethyl alcohol, C2H5OH, are present in 65 mL of a 1.5 M
?solution
Answer:
i dont know. Chemistry is really hard.
Explanation:
sorry
What is the value of for this aqueous reaction at 298 K?
A+B↽⇀C+D ΔG°=12.86 kJ/mol
K=
Answer:
The equilbrium constant is 179.6
Explanation:
To solve this question we can use the equation:
ΔG = -RTlnK
Where ΔG is Gibbs free energy = 12.86kJ/mol
R is gas constant = 8.314x10⁻³kJ/molK
T is absolute temperature = 298K
And K is equilibrium constant.
Replacing:
12.86kJ/mol = -8.314x10⁻³kJ/molK*298K lnK
5.19 = lnK
e^5.19 = K
179.6 = K
The equilbrium constant is 179.6In the outline of the Periodic Table below, some elements are shown as numbers.
Which two numbers are metals in the same period?
Answer:
5 and 6
Explanation:
Answer:
3 and 4
Explaination:
The metals are Sodium and Phosphorus respectively which are in period 2 of the periodic table but in different groups.
Can someone pls answer this question
number of proton of gold
Answer:
English Language Learners Definition of number. (Entry 1 of 2) : a word or symbol (such as "five" or "16") that represents a specific amount or quantity. : a number or a set of numbers and other symbols that is used to identify a person or thing.
Explanation:
79 is the number of protons gold has.
Hope this helps; have a great day!
Can someone tell me the answer and not a file link or anything like that
Answer:
A & B
Explanation:
This is because insulators just keep the house warm, while rheostats just control the current in the house. The circuit breakers and fuses, can stop something like a fire faster than the other two just by turning them off. Making them safety features in a house! Hope this helps! Plz mark as brainliest!
Answer:
circuit breakers and fuses
Explanation:
Circuit breakers and fuses are very similar as they are both designed to protect a circuit from an overload or short-circuit
names the process which takes place when a red litmus paper turns white when dropped into chlorine water
Answer:
Answer. Explanation: Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.
Which is the best example of a new substance forming?
cutting a piece of paper
lighting a match
popping a balloon
hitting a nail with a hammer
1. Write formulas for the binary ionic compounds formed between
the following elements:
a. potassium and iodine d. aluminum and sulfur
b. magnesium and chlorine e. aluminum and nitrogen
C. sodium and sulfur
The formulas for the binary ionic compounds are:
a. potassium and iodine: KI.b. magnesium and chlorine: MgCl₂.c. sodium and sulfur: Na₂S.d. aluminum and sulfur: Al₂S₃.e. aluminum and nitrogen: AlN.We want to write the formulas of different binary ionic compounds. to do so, we need to consider the octet's rule.
What is the octet's rule?The octet's rule establishes that atoms will lose, gain or share electrons to achieve the electron configuration of the nearest noble gas (8 valence electrons except for He with 2).
a. potassium and iodineK has 1 valence electron so it will lose 1 electron to form K⁺. I has 7 valence electrons so it will gain 1 electron to form I⁻. The neutral compound between K⁺ and I⁻ is KI.
b. magnesium and chlorine
Mg has 2 valence electrons so it will lose 2 electrons to form Mg⁺². Cl has 7 valence electrons so it will gain 1 electron to form Cl⁻. The neutral compound between Mg⁺²⁺ and Cl⁻ is MgCl₂.
c. sodium and sulfur
Na has 1 valence electron so it will lose 1 electron to form Na⁺. S has 6 valence electrons so it will gain 2 electrons to form S⁻². The neutral compound between Na⁺ and S⁻² is Na₂S.
d. aluminum and sulfurAl has 3 valence electrons so it will lose 3 electrons to form Al³⁺. S has 6 valence electrons so it will gain 2 electrons to form S⁻². The neutral compound between Al³⁺ and S⁻² is Al₂S₃.
e. aluminum and nitrogenAl has 3 valence electrons so it will lose 3 electrons to form Al³⁺. N has 5 valence electrons so it will gain 3 electrons to form N³⁻. The neutral compound between Al³⁺ and N³⁻ is AlN.
The formulas for the binary ionic compounds are:
a. potassium and iodine: KI.b. magnesium and chlorine: MgCl₂.c. sodium and sulfur: Na₂S.d. aluminum and sulfur: Al₂S₃.e. aluminum and nitrogen: AlN.Learn more about binary compounds here: https://brainly.com/question/7960132
what is the volume of a container that contains 24.0 grams of N2 gas at 328K and 0.884 atm
Answer:
Explanation:
10L
Taking into accoun the ideal gas law, The volume of a container that contains 24.0 grams of N2 gas at 328K and 0.884 atm is 26.07 L.
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
In this case, you know:
P= 0.884 atmV= ?n= [tex]24 gramsx\frac{1 mole}{28 grams} =[/tex] 0.857 moles (where 28 g/mole is the molar mass of N₂, that is, the amount of mass that the substance contains in one mole.)R=0.082[tex]\frac{atmL}{molK}[/tex]T= 328 KReplacing in the ideal gas law:
0.884 atm×V= 0.857 moles× 0.082[tex]\frac{atmL}{molK}[/tex] ×328 K
Solving:
[tex]V=\frac{0.857 molesx 0.082 \frac{atmL}{molK}x328 K}{0.884 atm}[/tex]
V= 26.07 L
The volume of a container that contains 24.0 grams of N2 gas at 328K and 0.884 atm is 26.07 L.
Learn more:
https://brainly.com/question/4147359?referrer=searchResultsNaproxen (sold under the name Aleve) is a nonsteroidal anti-inflammatory drug (NSAID), and is used to treat different types of pain.
a. True
b. False
which sounds better? oreo pancakes or a tamale with hot sauce
In DNA a purine base should only pair with a pyrimidine base. Give one reason why this
would be the case.
Answer:
Explanation:
Pairing of a specific purine to a pyrimidine is due to the structure and properties of these bases. A and G are purines and T and C are pyrimdines. In DNA base pairing, A pairs with T and C with G.