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April 19, 2014

Search: How much energy is needed to ionize a hydrogen atom in the n = 5 state

Number of results: 67,157

physics
A water molecule consists of an oxygen atom with two hydrogen atoms bound to it. The bonds are .100nm in length and the angle between the two bonds is 106 degrees. Use the x-y axis shown and determine the location of the center of gracity of molecule. Consider the mass of an ...
Thursday, January 25, 2007 at 4:23pm by cyndi

science, chemestry
Identify which concepts/topics you believe that you will need to apply to solve the problem below. Select all that apply. Covalent Bond Energy Ionic Bond Energy Single-electron Atom Ionization Energy Multi-electron Atom Ionization Energy Electronegativity Limiting Reagent ...
Sunday, November 18, 2012 at 12:18pm by smile

chemistry
A tube containing hydrogen atoms in the n=3 shell does not absorb visible light. The longest wavelength absorbed is 1875 nm. What state is the hydrogen atom in after absorbing a 1875 nm photon?
Saturday, January 22, 2011 at 11:39am by Maria

Chemistry
Consider a system of three molecules A, B, and C. Suppose that three units of energy can be distributed over the three atoms. Each atom can have no energy, one unit of energy, two units of energy, or all three units of energy. Assume that each of the ten possible arrangements ...
Tuesday, October 23, 2007 at 12:45am by Richard

Chemistry
For fluoracetic acid the highest Boltzmann distribution is when the dihedral angle is at 0 degrees. However, going from chloro- to bromoacetic acid, an increasing dip in the Boltzmann distribution occurs at 0 degrees. What is responsible for this "dip?" (HINT: look at how the...
Monday, July 12, 2010 at 7:34pm by Anth

Chemistry
When an atom is at rest it is said to be in the ground state. All of the electrons are in their "normal" positions; i.e, 2 in the first shell, 8 in the second, etc. When the atom absorbs energy from some source, one of the electrons is moved to an outer unfilled shell (or ...
Tuesday, October 21, 2008 at 7:47pm by DrBob222

Physics
Supppose an atom has four distinct energy states. Assuming all transitions are possible, how many spectral lines can this atom produce? Answer with a number only.... ? have no idea
Friday, April 11, 2008 at 12:32am by Molly

chemistryy
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 4.548 x 10^-10m. Determine the frequency (in hz) of the interacting photon. i got 1.45691908531e-24 but it is wrong :(
Saturday, January 12, 2013 at 11:20am by p

Physics
I suppose two reasons. One is that the electrons are on the outside of an atom which makes them much more accessible than the protons which are located in the nucleus. Second, the protons are much more massive than the electron and the kinetic energy required to eject a proton...
Tuesday, April 1, 2008 at 10:56pm by DrBob222

Chemistry!
E = hc/wavelength = xx J energy of 1 photon. How much energy do you need? q to heat coffee. = mass water x specific heat water x delta T = ?? joules total needed. so how many of those photons will you need? ?? J/photon x # photons = ??total joules needed. So you
Sunday, November 14, 2010 at 4:54pm by DrBob222

PHYSICS- Laws of Motion
During the collision between electron and atom, the electron exerts a force on the atom and the atom exerts an equal and opposite force on the electron. That is Newton's third law. The rest of the problem is about the energy required to free a bound electron from its orbit ...
Wednesday, January 13, 2010 at 2:24pm by Damon

Chemistry
An electron ps from the 6th to te 3rd energy level in the hydrogen atom: a) calculate the wavelength b) calculate the frequency c) calculate te enrgy d) into which spectral series would the photon be grouped? (i really just need to formulas, then i could solve myself...)
Monday, May 23, 2011 at 9:52pm by Ella

Chemistry :) simple question
The above assumes that the acid consists of an aqueous solution. HCl reacts with Na to produce NaCl and Cl2 gas, not hydrogen. In fact, I guess my answer is actually wrong; a gas atom is displaced, but it's not necessarily hydrogen.
Thursday, February 21, 2013 at 10:48am by Steve

Science
A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at this ...
Wednesday, July 18, 2012 at 7:11pm by Bob

Science
A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at this ...
Wednesday, July 18, 2012 at 8:07pm by Rob

Chemistry
Since the HAc is the weaker acid, the formic acid acts, according to Le Chatelier's Principle, to shift the weaker acid to the left. HAc ==>H^+ + Ac^- Adding H^+ from the other acid make HAc ionize to a smaller extent. You can work out how much it would ionize on its own ...
Sunday, February 26, 2012 at 10:02pm by DrBob222

Chemistry
An atom contains a total of 25 electrons. When the atom is in the ground state, how many different principal energy levels will contain electrons? a. 1 b. 2 c. 3 d. 4 I really don't get this because I thought energy levels went like 2, 8, 18, 32, and 50, but 25 is between 18 ...
Friday, October 15, 2010 at 8:22pm by timmy123

physics
The mass of a carbon atom is 2 x 10 ^ -26. What is the kinetic energy of a carbon atom moving with a speed of 500 m/s? What is the formula I would need?
Monday, November 30, 2009 at 6:35pm by Julia

Chemistry
An atom contains a total of 29 electrons. When the atom is in the ground state how many principle energy levels will contain electrons? a: 1 b: 2 c: 3 d: 4 How do you figure this out?
Saturday, October 9, 2010 at 3:21pm by danny123

Physics Homework
Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy does ...
Sunday, October 20, 2013 at 12:46am by Eli Smith

Physics
Eupper - Elower = h*(frequency) = h*c/(wavelength) Each energy level has a certain atom energy associated with its electron orbits. A photon of light with a specific energy is emitted or absorbed when a transition occurs between levels. Total energy remins conserved. h = ...
Wednesday, February 9, 2011 at 6:08am by drwls

Delta T
yes and yes. Just look at the ionization. i is the number of particles. NaCl ==> Na^+ + Cl^- i = 2. C6H12O6 ==> doesn't ionize. i = 1. Na2SO4 ==> 2Na^+ + SO4^= i = 2+1 = 3 Acetic acid. HC2H3O2 ==> H^+ + C2H3O2^- i = between 1 and 2. The i done this way is ...
Monday, May 4, 2009 at 12:07pm by DrBob222

Chemistry
It takes 208.4 kJ of energy to remove 1 mole of electrons from 1 mole of atoms on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom on the surface of solid rubidium in Joules? What is the maximum wavelength of light capable of...
Sunday, October 30, 2011 at 11:11am by franz

physics
In the ground state of the H-atom the electron has a total energy of -13.6 eV. What are (a) its kinetic energy, and (b) its potential energy if the electron is one Bohr radius from the central nucleus.
Friday, May 20, 2011 at 3:18pm by alice

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.46810−10 m. Determine the frequency (in hz) of the interacting photon.
Friday, January 11, 2013 at 12:47pm by T

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.46810−10 m. Determine the frequency (in hz) of the interacting photon.
Friday, January 11, 2013 at 5:06pm by T

Chem Help please
Consider a system of 3 molecules, A, B, and C. Suppose the 3 units of energy can be distributed over the three atoms where each atom can have no energy, one unit, two units or 3 units of energy. Assume each of the 10 possible arrangements is equally probable. What's ...
Friday, November 5, 2010 at 12:54am by Melissa

CHEM. help please
Consider a system of 3 molecules, A, B, and C. Suppose the 3 units of energy can be distributed over the three atoms where each atom can have no energy, one unit, two units or 3 units of energy. Assume each of the 10 possible arrangements is equally probable. What's ...
Friday, November 5, 2010 at 4:26pm by Melissa

chemistry
They are moved to higher energy levels of the atom OR they may be moved so far away the atom is ionized. Whether that happens or not depends upon the temperature of the flame.
Monday, November 15, 2010 at 9:28pm by DrBob222

Chem
From the information below, identify element X. a. The wavelength of the radio waves sent by an FM station broadcasting at 97.1 MHz is 30.0 million (3.00 X lo7) times greater than the wavelength corresponding to the energy difference between a particular excited state of the ...
Thursday, March 29, 2007 at 10:55pm by Dianne

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 1.82810−10 m. Determine the frequency (in hz) of the interacting photon.
Friday, January 11, 2013 at 12:47pm by kaken

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.46810−10 m. Determine the frequency (in hz) of the interacting photon.
Saturday, January 12, 2013 at 3:56am by Ankur

chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 3.18810−10 m. Determine the frequency (in hz) of the interacting photon.
Saturday, January 12, 2013 at 4:35am by howard

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 3.18810−10 m. Determine the frequency (in hz) of the interacting photon.
Saturday, January 12, 2013 at 7:35am by selly

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.46810−10 m. Determine the frequency (in hz) of the interacting photon.
Saturday, January 12, 2013 at 10:23am by Ankur

chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 5.90810−10 m. Determine the frequency (in hz) of the interacting photon.
Saturday, January 12, 2013 at 5:14pm by Blair

chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 5.90810−10 m. Determine the frequency (in hz) of the interacting photon.
Sunday, January 13, 2013 at 8:46pm by ouut!

Physics
See here for details: http://en.wikipedia.org/wiki/Paschen's_law You can use that the mean free path for electrons in air is about 5*10^(-7) meters. You always have ions and electrons in the air, so what needs to happen is that an electron has to be accelerated due to the ...
Friday, August 2, 2013 at 10:02am by Count Iblis

Probability
Consider a system of three molecules A, B, and C. Suppose that three units of energy can be distributed over the three atoms. Each atom can have no energy, one unit of energy, two units of energy, or all three units of energy. Assume that each of the ten possible arrangements ...
Monday, October 22, 2007 at 10:58pm by Richard

Chemistry
It becomes easier to pull electrons away (that's what ionization energy is) from an atom as the electron is further from the nucleus. Therefore, the smallest ionization potential will be that of the largest atom.
Monday, November 19, 2007 at 6:52pm by DrBob222

chemistry
You look at how they ionize. (NH4)3PO4 ==> 3NH4^+ + PO4^-3 So that's 4 particles. NaCl is 2. CsCl = 2 BaCl2 = 3 Ba3(PO4)2 = 5 C12H22O11(sucrose; i.e., table sugar) = 1 since it dissolves BUT doesn't ionize. Glucose, C6H12O6 = 1
Sunday, September 26, 2010 at 10:28am by DrBob222

chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 1.828×10−10 m. Determine the frequency (in hz) of the interacting photon.
Saturday, January 12, 2013 at 4:12am by ani

chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 3.18810−10 m. Determine the frequency (in hz) of the interacting photon. Please help!
Saturday, January 12, 2013 at 4:16pm by Anonychem

chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 1.828×10−10 m. Determine the frequency (in hz) of the interacting photon.
Sunday, January 13, 2013 at 5:22am by ani

General Chemistry
How much energy in kJ is realeased to form one mole of Cd 116(isotope) from protons and neutrons if the atom has a mass of 115.90476amu.
Saturday, May 8, 2010 at 2:49pm by Chem

Physics
Describe the Bohr model of the atom. What is de Broglie's key idea (involving matter waves) that makes the Bohr atom have discrete energy levels?
Monday, November 16, 2009 at 3:10pm by Lauren

science
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 10ȳ joule seconds, the speed of light is 2.998 10 m/s)
Thursday, April 18, 2013 at 1:58pm by Anonymous

chemistry
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 10ȳ joule seconds, the speed of light is 2.998 10 m/s)
Wednesday, June 12, 2013 at 9:07am by Anonymous

ha
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 10ȳ joule seconds, the speed of light is 2.998 10 m/s)
Friday, October 11, 2013 at 1:28pm by gg

Physical Science
Hello! I need help with this science questions. Thank You! 2. One of the reasons E=mc^2 is important to us is because it explains how our sun produces huge amounts of energy through nuclear fusion of hydrogen atoms. Use this example to describe the relationship between the ...
Wednesday, March 25, 2009 at 5:52pm by Amy

science help?
(a) One such reaction fuses two nuclei of carbon-12 ( 6 12C ) to form an atom of neon ( 10 20Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way. (b) Another ...
Monday, March 18, 2013 at 10:49am by sam

Atomic physics
1)What is the longest wavelength light capable of ionizing a hydrogen atom in the n = 6 state 2)a. Calculate the energy of the electron in the ground state of single ionized helium, which has an atomic number Z = 2. b. Calculate the radius of its ground-state orbit
Sunday, April 13, 2008 at 3:43pm by Sandhya

physics
A hydrogen nucleus has a radius of 1 x 10-15 m and the electron is about 5.3 x 10-11 m from the nucleus. Assume the hydrogen atom is a ball with a radius of about 5.3 x 10-11 m and the nucleus is a ball with a radius of 1 x 10-15 m. How much work (in electron volts) must be ...
Thursday, April 24, 2008 at 8:16pm by shanika

chem
In a vehicle, H2 could be used in a fuel cell to generate energy. Hydrogen is not an energy source, but a means of transporting energy because the extraction of H2 from the logical source, H2O, takes as much energy as is returned when the gas is used. 2 H2O (l) → 2 H2 (g...
Tuesday, November 2, 2010 at 5:27pm by Andrew

chemistry
They are either moved to a higher energy level associated with the atom OR the electron can be moved so far away it ionizes the atom. Whether that happens or not depends upon the temperature of the flame.
Monday, November 15, 2010 at 9:29pm by DrBob222

Chemistry
Multi-electron Atom Ionization Energy, Conservation of Energy, Wave-Particle Duality.
Sunday, November 18, 2012 at 11:34am by c

Physics Homework
Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy does ...
Sunday, October 20, 2013 at 1:44am by Eli Smith

Physics
A 46% efficient device uses chemical energy to generate 570J of electric energy. 1. How much chemical energy is used? 2. A second device uses twice as much energy to generate half as much electric energy. What is its efficiency?
Tuesday, December 4, 2012 at 2:29pm by Anonymous

Chemistry
How much energy is needed to melt a 30.5 g ice cube?
Tuesday, February 23, 2010 at 5:16pm by Christopher

chemisty
How much energy is needed to melt a 30.5 g ice cube?
Tuesday, February 23, 2010 at 5:17pm by Christopher

physics
how much energy is needed to heat 50 grams of ethanol
Wednesday, July 21, 2010 at 5:22pm by sas

Chemistry
Hydrogen is generated by passing hot steam over iron, which oxidizes to form Fe3O4, in the following equation: a. if 625 g of Fe3O4 is produced in the reaction, how many moles of hydrogen are produced at the same time? b. how many moles of iron would be needed to generate 27 g...
Monday, May 28, 2012 at 2:02pm by Lisa

Physics
Calculate d energy of d 3rd level of an atom if d ground state energy is -24.8ev
Sunday, April 28, 2013 at 2:32pm by Mei

phisic
(a) One such reaction fuses two nuclei of carbon-12 (12/6C ) to form an atom of neon (20/10Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way. (b) Another ...
Saturday, April 20, 2013 at 5:45pm by john ergent help pleaseeeeeeeeeeeeeeeeeee?

Chem
Thank you for the clarification. They are relatively weak bonds between hydrogen and another atom in a different molecule. I was confused because I had heard about the hydrogen bond between water molecules. Such bonds do not occur within NH4Cl molecules
Monday, November 24, 2008 at 11:45pm by drwls

chem
how many grams of hydrogen chloride is needed to produce 200 grams of hydrogen
Tuesday, January 11, 2011 at 2:35pm by ashley

physics
An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.11 10-11m. What is EPEfinal - EPEinitial, which is the ...
Wednesday, January 30, 2008 at 7:51pm by rick

physics
An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.40 10-11 m. What is EPEfinal - EPEinitial, which is the ...
Friday, February 1, 2013 at 4:43pm by abby

Chemistry
Breaking a bond required energy. Energy is absorbed when bonds are broken. That much you know. I think the mix up may be in that first statement. When bonds form, energy is released, and so the reaction absorbs energy. Yes, energy is released when bonds form. Whether the ...
Saturday, February 16, 2013 at 7:38pm by DrBob222

Physics
The temperature in an electric oven is 165C. The temperature at the outer surface in the kitchen is 55C. The oven (surface area = 1.6 m2) is insulated with material that has a thickness of 0.023 m and a thermal conductivity of 0.045 J/(smC). a) How much energy is used to ...
Wednesday, April 18, 2007 at 6:51pm by papito Urgent help needed

chem
Weak acids don't ionize 100%. In fact, that is the definition of a weak acid; i.e., strong acids ionize 100% while weak acids ionize less than 100%. If any acid ionizes less than 100% then the dissociation constant must be less than one because the numerator numbers will be ...
Thursday, May 29, 2008 at 10:21am by DrBob222

science
getting ready to turn this in just want to check my answers any takers?? 1. In an atom, electrons ____. (1 point) are located in the nucleus are paired with neutrons are located in the electron cloud are always in the same place 2. The maximum number of electrons in the second...
Thursday, April 11, 2013 at 9:56pm by T-mara

chemistry
The energy levels the electron can occupy in the H atom can be calculated using the energy level equation. Calculate the wavelength (nm) of the photon absorbed when the electron goes from a n= 1 energy level to a n= 3 energy level. Express answer in scientific notation. ...
Tuesday, October 11, 2011 at 5:07pm by Chris

MATH PLEASE HELP
A certain molecule contains twice as many atoms of hydrogen as oxygen and one more atom of carbon than hydrogen. If there are 31 atoms altogether in the molecule. how many atoms of carbon are there?
Tuesday, October 19, 2010 at 7:00pm by steph

chemistry
if 150g of Ca(OH)2 is reacted with excess H2, how much energy will be needed?
Sunday, January 9, 2011 at 12:56pm by Vilika

college chemistry
Calculate the % empty space in 1 mole of water at 25 degree C (d=0.9971g/ml). The volume of a water molecule can be taken as the sum of the volumes of the 2 hydrogen molecules and the oxygen atom. Use the single bonded covalent radii of 37pm for hydrogen and 66pm for oxygen.
Tuesday, February 3, 2009 at 9:23pm by christy

chemistry
The more reactive an atom, the higher its potential energy. Which atom has higher potential energy, neon or fluorine? Neon is hardly reactive at all. When it reacts, it will make news. Fluorine is a very reactive element. It is very difficult to keep it from reacting, often ...
Sunday, November 19, 2006 at 10:39pm by carter

Chemistry
The -2.98C using 3 for i is the correct value to use. In truth you ALWAYS use the van't Hoff factor of i. The equation is delta T = i*Kf*m The van't Hoff factor is always 1 for almost all organic compounds that do not ionize. Since they don't ionize there is 1 particle/...
Thursday, November 8, 2012 at 10:58am by DrBob222

Physics
Question: The amount of internal energy needed to raise the temperature of .25 kg of water by 0.2 degrees Celsius is 209.3 J. How fast must a 0.25 kg baseball travel in order for its kinetic energy to equal this internal energy? KE = (.5)(m)(v^2) 209.3 J = (.5)(.25kg)(v^2) ...
Monday, February 15, 2010 at 7:26pm by mike

phsyical science
compare an atoms structure to a ladder. what parts of the ladder correspond to the energy levels of the atom/ identify one way a real ladder is not a good model for an atom.
Wednesday, October 15, 2008 at 10:21pm by taylor

physics
A hydrogen atom is in its n = 6 excited state. Determine, according to quantum mechanics, each of the following: (a) The total energy =eV (b) The magnitude of the maximum angular momentum the electron can have in this state =J s (c) The maximum value that the z component of ...
Friday, December 1, 2006 at 6:15pm by MIke

physics
A hydrogen atom is in its n = 6 excited state. Determine, according to quantum mechanics, each of the following: (a) The total energy =eV (b) The magnitude of the maximum angular momentum the electron can have in this state =J s (c) The maximum value that the z component of ...
Saturday, December 2, 2006 at 1:54pm by MIke

Science
Atom building game board has 17 protons, 18 neutrons, and 18 electrons. *What is the atom that's represented on the game board. *What is the total charge on this atom? *What is the mass # of this atom? *What do you call an atom that different #'s of protons and neutrons? *What...
Friday, September 21, 2007 at 8:51pm by Sonic

PHYSICS
The average kinetic energy of an atom in a monatomic ideal gas is given by KE=3/2kT, where k=1.38*10^-23J/K and T is the Kelvin temperature of the gas. Determine the de Broglie wavelength of a helium atom (mass=6.65*10^-27kg) that has the average kinetic energy at room ...
Tuesday, April 29, 2008 at 8:52pm by Elaine

Chemistry130
ionization energy is the energy to remove an electron. The further an electron is from the nucleus, the less is ionization energy. So atom size is a predominate factor.
Thursday, September 17, 2009 at 10:18am by bobpursley

Physics
Q1. The answer is +13.6 eV A removed electron at infinite distance is defineed to have zero energy. Q2. Both are analogous inverse-square-law situations. The ionization energy needed to remove an electron is similar to the "escape velocity" kinetic energy needed to leave the ...
Tuesday, May 26, 2009 at 3:53pm by drwls

science help needed
Question complete teh diagram below by using arrows, words and or numbers to show how properties of te helements vary across a period. Electron arrangement left right 1 2 3 4 3 2 1 0 1. loss of electrons 2. Energy needed to remove an electron can someone help me with the first...
Thursday, November 15, 2007 at 8:57pm by sam

physics
One atom of Deuterium weighs 2.013553AMU. One atom of Helium weighs 4.002602AMU. In nuclear fusion, the process which powers the Sun and all other stars, 2 atoms of Deuterium are combined to form 1 atom of helium. Calculate the energy released by one such combination. (1AMU = ...
Friday, January 22, 2010 at 4:51pm by robin

college chem. please help!!
Calculate the % empty space in 1 mole of water at 25 degree C (d=0.9971g/ml). The volume of a water molecule can be taken as the sum of the volumes of the 2 hydrogen molecules and the oxygen atom. Use the single bonded covalent radii of 37pm for hydrogen and 66pm for oxygen.
Tuesday, February 3, 2009 at 9:54pm by christy

chemistry
If the energy state of the H-atom is changed from n=3 to n=2: What is the energy change in joules? Energy Change = J What is the frequency of the photon emitted? Frequency = Hz
Thursday, September 29, 2011 at 3:53pm by brie

chemistry
If the energy state of the H-atom is changed from n=3 to n=2: What is the energy change in joules? Energy Change = J What is the frequency of the photon emitted? Frequency = Hz
Thursday, September 29, 2011 at 3:53pm by brie

math
the ratio of hydrogen atom to oxygen atoms in water is 2:1 if an amount of water contains 341 trillion atoms of oxygen how many hydrogen atoms are there? how would i do this?
Thursday, October 21, 2010 at 5:48pm by courtney

chemistry
Given the following equation: Mg(s)+2HCl(aq) goes to MgCl2(s)+H2(g) How many grams of hydrogen chloride (HCl) are needed to produce 200g of hydrogen H2?
Monday, January 17, 2011 at 3:07pm by Jasmine

Chemistry
Suppose we take the Na ion as an example. It has one electron in the outside shell. When anything containing the Na ion is placed in a flame, (NaCl, Na2SO4, NaBr, etc), the atom absorbs energy from the flame and the outside electron is moved to an outer energy level. That is ...
Saturday, January 12, 2008 at 9:10pm by DrBob222

physical science
when a photon of energy hf elects an electro violently from an atom. How is this energy distribute in the process me electing electron?
Tuesday, March 13, 2012 at 4:09pm by euvin

CHEM
is trigonal planar bent though? or would it basically look just as you have it, but with 2electrons on top of the "O" & 2 on the bottom of it? & then 6/3pairs of electrons around the "Cl". or...being as how these structures are way too hard to type out: the "Carbon" would be ...
Monday, November 26, 2007 at 10:07pm by K

College Chemistry
A hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by: En=-(2.18x10^(-18)J)Z^2(1/(n^2)) where n is the principal quantum number and Z is the atomic number of the element. Calculate the ionization energy (in kJ...
Monday, November 22, 2010 at 10:36pm by Anonymous

Chemistry - Help please!
A hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by: En=-(2.18x10^(-18)J)Z^2(1/(n^2)) where n is the principal quantum number and Z is the atomic number of the element. Calculate the ionization energy (in kJ...
Monday, November 22, 2010 at 11:17pm by Anonymous

chem
an energy value of 3.313x10^-19 joules is needed to break a chemical bond. what is the wavelength of energy needed to break the bond? (the speed of light = 3.00x10^10 cm/sec; planck's constant = 6.636x10^-34 J . sec is there a formula i'm missing? Formula (memorize this) ...
Saturday, April 21, 2007 at 3:37pm by ashley

CHEMISTRY
Bob Pursley gave you that very good answer. I'll get you started with neon lights. Neon lights (that's the common name but they may contain other gases than neon) are tubes, usually of glass, with a connection at each end and a voltage is applied to the electrodes. Electrons ...
Sunday, November 13, 2011 at 6:08pm by DrBob222

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