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July 24, 2014

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

Number of results: 40,489

Functions/Logarithims
Energy is needed to transport a substance from outside a living cell to inside the cell. This energy is measured in kilo calories per gram molecule, and is given by E = 1.4 log (C1) / (C2 where C1 represents the concentration of the substance outside the cell, and C2 ...
March 8, 2012 by Steph

Chemistry
"explain with the help of an appropriate labelled sketch diagram how hydrogen atom which has only one electron has so many spectral lines" Can someone tell me if i need to draw a schroedinger model of an atom or if i need to draw an energy level diagram? I'm not sure which one...
March 8, 2007 by Hol

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 ...
January 30, 2008 by rick

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.
October 15, 2008 by taylor

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
April 13, 2008 by Sandhya

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 = ...
January 22, 2010 by robin

Science
zinc is mixed with Hydrochloric acid to form zinc chloride and hydrogen gas. if 7.3 grams of zinc completely reacts how much hydrogen gas will be created? if you collect the hydrogen over water at 23 degrees celcius and a barometric pressure of 770 mmHg and you recover 2.30 ...
April 16, 2014 by Tylor

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? I got 2.5 x 10^-21 which is correct. The second question states: Two carbon atoms are joined by a spring-like carbon-carbon bond. The potential energy stored ...
November 30, 2009 by Julia

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.
February 3, 2009 by christy

Chem 1
It takes 208.4 kJ of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal. What is the maximum wavelength (in nm) of light capable of removing a single electron from an atom on the surface of rubidium metal? Ok, I know I have to find how many kJ ...
October 21, 2006 by Rossi

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...
April 11, 2013 by T-mara

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...
November 15, 2007 by sam

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 ...
March 25, 2009 by Amy

chemistry
how much energy would be needed to warm 7.40 g of water by 55 degrees celcius
May 11, 2010 by lisa

Chemistry
How much energy (in kcal) is needed to convert 53.2 g of water at 55.0 C to steam at 100.0 C
October 4, 2011 by Martha

CHEMISTRY
How much heat energy is needed to convert 125.0g of ice from -27.0ºC to a liquid at 50.0ºC?
December 16, 2011 by Cha-Ching

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 ...
November 19, 2006 by carter

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.
February 3, 2009 by christy

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?
March 13, 2012 by euvin

physics
An "energy bar" contains 5.6g of fat. a)How much energy is this in joules? b)How much energy is this in calories? c)How much energy is this in Calories?.
November 13, 2010 by andrea-1

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. ...
October 11, 2011 by Chris

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...
May 28, 2012 by Lisa

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 ...
December 1, 2006 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 ...
December 2, 2006 by MIke

physics
please someone give me a hand at this problem. . . Describe the Bohr model of the atom. What is Bohr’s key idea (involving matter waves) that makes the Bohr atom have discrete energy levels?
November 10, 2007 by Veronica

AP 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 5.29*10^.11m. What is the change in EPE(electric potential ...
March 26, 2008 by Becky

chemistry
Can someone help me to check my answer and the way I solve this problem is right or wrong? Determine the energy required to turn a Na metal atom into a gas phase ion (Na+ (g)). Ionization energy of Na(g) 499 kJ/mol Electron affinity of O(g)for2e- 603 kJ/mol Energy to vaporize ...
September 7, 2012 by Jenny

Physics ~Conservation of Energy~ part 2
1.) A 500 kg roller coaster is pulled to the top of a hill 45 m high and arrives at the top with a zero speed. a) how much work has done by the vhain to pull the car to the top? b) how much potential energy does it have at the top? c)What is the total energy of the system? d) ...
January 30, 2013 by Isis

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) ...
April 21, 2007 by ashley

Physics
Exactly what is a positively charged hydrogen atom?
April 17, 2008 by Shelly

BIOLOGY
How many hydrogen atoms will bond with each nitrogen atom?
June 20, 2011 by Sherri

physics
--------------------------------------- A rugby player of mass 82kg is running at 6.0m/s. How much energy will be needed to stop him? ---------------------------------------
March 29, 2011 by XxKineticxX

Beginner Chemistry
How much heat energy is needed to convert 125.0g of ice from -27.0ºC to a liquid at 50.0ºC?
December 19, 2011 by Cha-Ching

Chemistry - Explain...
Hello! I'm hoping you can please help me with this! I left my book at school (I thought I'd left it in my backpack all day to bring home), and I'm in desperate need of your help because I have a test tomorrow. "Answer the following questions, which refer to the 100mL samples ...
November 28, 2006 by Rachel

Chemisty
Answer the questions below for an element that has the electron configuration 1s2 2s2 2p6 3s2 3p3. A. What is the symbol for this element? B. What is the atomic number of this element? C. How many unpaired electrons does an atom of this elelemt have? D. How many valence ...
October 20, 2013 by Joe

Chemisrty
Answer the questions below for an element that has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1. A. What is the symbol for this element? B. What is the atomic number of this element? C. How many unpaired electrons does an atom of this elelemt have? D. How many valence ...
October 20, 2013 by Kristen

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?
October 19, 2010 by steph

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 5.29 x 10 -11 m. what is EPE final - EPE initial, which is ...
May 2, 2010 by lara

chemistry
how do i calculate the wavelength of light emitted by a hydrogen atom?
November 30, 2008 by kota

chem
how many grams of hydrogen chloride is needed to produce 200 grams of hydrogen
January 11, 2011 by ashley

A&P
Compare ionic, covalent, and hydrogen bonding, and fully describe an example of each. Is this right and I need help with an example of a covalent bond. Ionic bond is formed from one metal and one non metal. It is a solid at room temperate. In an ionic bond and electron is ...
November 14, 2010 by Danielle

Electrochemistry
How much electric charge is needed to produce 1.000kg of Na metal from the Na+ ions in NaCl? You need one electron per atom. How many atoms are present in 1kg of Na? Use avagradros number. To change to coulombs, remember that 1 electron= 1.6E-19C
May 17, 2007 by Jerry

chem
Rank the following species according to the decreasing energy needed to raise the temperature of 10.0g of the substance by 25.0 degrees celsius Rank from most to least energy needed. Rank these in order of the question. copper aluminum cast iron silver water
February 1, 2013 by mira

Assist me Plzz!
What is the p.d. between 2 points in a circuit if 200J of electrical energy are changed to other forms of energy when 25 coulombs of electric charge pass? If the charge flows in 10 seconds, what is the current? Science help needed here. Vq=energy you know q, and energy.
April 17, 2007 by Demola

Physics
Aa particular bicycle is 25% effificent in converting the energy of a cyclist to mechanical energy (that is, she puts in four times as much energy as she gets out). if a cyclist is travelling along a pathway at a constant speed of 5.8 m/s for 1 h, and the aveage resistance is ...
April 12, 2011 by Francis

Chemistry
Methanol (CH3OH) is used in the production of many chemicals. methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2H2(g) ==> CH3OH(g) a) How many moles of each reactant are needed to produce 3.60 x 10^2 g CH3OH? b)Calculate ...
April 5, 2010 by Kim

chem h
Methanol (CH3OH) is used in the production of many chemicals. methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2H2(g) ==> CH3OH(g) a) How many moles of each reactant are needed to produce 3.60 x 10^2 g CH3OH? b)Calculate ...
December 5, 2011 by Skye

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?
October 21, 2010 by courtney

Chemistry
Which statement concerning the electrons surrounding the nucleus of an atom is NOT correct? a) When 2 electrons pair together, they have opposite spins. b) The number of the electrons in an isolated neural atom is equal to the atomic number c) The second main energy level can ...
September 27, 2012 by Peter

math fractions
A recipe for strawberry punch calls for quart (qt) of ginger ale and qt of strawberry soda. a) How much liquid is needed? b) If the recipe is doubled, how much liquid is needed? c) If the recipe is halved, how much liquid is needed?
November 15, 2009 by lady bug

math fractions
A recipe for strawberry punch calls for quart 1/5(qt) of ginger ale and 3/5 qt of strawberry soda. a) How much liquid is needed? b) If the recipe is doubled, how much liquid is needed? c) If the recipe is halved, how much liquid is needed?
November 15, 2009 by nikki C

Chemistry
How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations.
May 6, 2011 by Jay

Solar Energy - Engineering
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the hydrogen ...
December 18, 2013 by Chris

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?
December 4, 2012 by Anonymous

Chemistry
I have all of the answers but this one so if anyone knows this answer, i can trade you :) I tried using the formulas that were posted but i ended up with a weird answer that didnt work.... A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The ...
January 13, 2013 by Chemistry

Physics
Charged particles such as ions can separate the charges inside of overall electrically neutral atoms, thus making an electric dipole. A dipole is characterized with a dipole moment p=αEexternal, where α is the polarizability of an atom, and Eexternal is the external ...
July 1, 2013 by Mary

Physical Science
What is the total number of electrons in a normal atom of hydrogen?
February 18, 2008 by casey

chemistry
What is (delta E) for the traansition of an electron from n=9 to n=4 in a Bohr hydrogen atom? What is the frequency? Thank you!
March 12, 2014 by abby

chemistry
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the hydrogen ...
December 18, 2013 by Danny Simone

calculus
In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the hydrogen ...
December 18, 2013 by Danny Simone

Chemistry
The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179 x 10-18/n2 J where n is the principal quantum number for the energy level. What is the frequency in Hz of the electromagnetic radiation absorbed when an electron is ...
October 21, 2013 by Andy

Physics
The following values are the only allowable energy levels of a hypothetical one-electron atom: E6 = =2 X 10^-19 J E5 = -7 X 10^-19 J E4 = -11 X 10^-19 J E3 = -15 X 10^-19 J E2 = -17 X 10^-19 J E1 = -20 X 10^-19 J A) If the electron were in the n = 3 level, what would be the ...
January 24, 2010 by Vea

Chemistry
When a sodium atom absorbs light at 330.2 nm, the 3s electron is promoted to the 4p level. How much energy would be required for ionization once the electron is in the 4p level?
May 13, 2011 by Kelsey

Chemistry
When a sodium atom absorbs light at 330.2 nm, the 3s electron is promoted to the 4p level. How much energy would be required for ionization once the electron is in the 4p level?
May 13, 2011 by Kelsey

chemistry
How many grams of iron are needed to produce 42.8 L of hydrogen gas according to the following reaction at 25oC and 1 atm? iron (s) + hydrochloric acid (aq) iron(II) chloride (aq) + hydrogen (g)
January 27, 2012 by jim

Chemistry
Which atom has the smallest valence p atomic orbital? -Carbon -Nitrogen -Sulfur Why? A. That atom has the highest electronegativity. B. That atom has the fewest number of electrons. C. That atom does not have electrons in p orbitals. D. The valence electrons for that atom have...
April 19, 2012 by Pooya

ap chem
The diatomic molecule OH exists in the gas phase. The bond lengthand bond energy have been measured to be 97.06 pm and 424.7 kJ/mol.Knowing that only the 2p orbitals of will interact significantlywith mol, respectively. Assume that the OH molecule is analogous tothe HF ...
January 2, 2013 by bob

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...
November 22, 2010 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...
November 22, 2010 by Anonymous

Chem help
Answer the questions below for an element that has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1. A. What is the symbol for this element? B. What is the atomic number of this element? C. How many unpaired electrons does an atom of this elelemt have? D. How many valence ...
October 17, 2012 by Lena

Chemistry
In an atom whose core contains 16 neutrons possess a total electrical charge 1. What is the atomic number of the atom? 2.What is the number of nucleons(mass)? 3.How much electrons has in electronic mantle?
November 23, 2010 by Ciara

Japan's Nuclear Crisis
How does nuclear fission create energy? Nuclear energy is produced through the splitting, or fission, of a uranium atom in the core of a nuclear reactor. When hit by a neutron, the atom divides and releases two other neutrons, as well as heat and radioactive particles. The ...
April 19, 2011 by Anonymous

physics
The temperature of 7.10 mol of an ideal monatomic gas is raised 15.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ÄEint in internal energy of the gas, and (d) the change ÄK in the average kinetic ...
April 8, 2009 by sweety

physics
The temperature of 7.10 mol of an ideal monatomic gas is raised 15.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ÄEint in internal energy of the gas, and (d) the change ÄK in the average kinetic ...
April 8, 2009 by sweety

Chemistry please check!
A 0.21g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration in mol1-1 in this solution and show successive steps in the calculation: If 0.21g in 0.25l then 0.84g in 1l. Add together ...
March 9, 2007 by Hol

Nuclear FIssion
How does nuclear fission create energy? Nuclear energy is produced through the splitting, or fission, of a uranium atom in the core of a nuclear reactor. When hit by a neutron, the atom divides and releases two other neutrons, as well as heat and radioactive particles. The ...
April 19, 2011 by Anonymous

general chemistry
Calculate the de Broglie wavelength (in pm ) of a hydrogen atom traveling 445 m/s.
February 13, 2011 by soso

chemistry
What is the longest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 8p^1? Thank you!!
March 12, 2014 by abby

thermal physics
The temperature of 7.10 mol of an ideal monatomic gas is raised 15.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ÄEint in internal energy of the gas, and (d) the change ÄK in the average kinetic ...
April 9, 2009 by chirayu

Chemistry 22
1. What is the Kelvin temperature of a system in which 4.50 mol of a gas occupy 0.250 L at 4.15 atm? 2. In the lab, students generated and collected hydrogen gas according to the following equations: Zn + H2SO4---> H2 + ZnSO4 a) How many mL of hydrogen gas at STP were ...
November 29, 2010 by Ivy

Chemistry
Hydrogen peroxide is used as a bleachin agent, a disinfectant and medicinally as a topical antibacterial agent. Hydrogen peroxide decomposes according to the reacton 2H^2O^2(l)-->2H^2O(l)+o^2(g) A. Given the standard free energy of formation values shown below, calculate ...
May 15, 2007 by Christian

chemistry
the model of the atom that pictured the atom with electrons struck randomly throughtout the mass of the atom was called the
October 27, 2010 by 000

Chemistry
The first excited state of the hydrogen atom is separated from the ground state by 10.2 eV. (a) At what wavelength does this occur and what is the energy difference in kJ mol-1 between the ground and excited states? Show your working in each case. (b) If the degeneracy of the ...
March 28, 2010 by Hobson

physics
A neon atom (m = 20.0 u) makes a perfectly elastic collision with another atom at rest. After the impact, the neon atom travels away at a 55.2° angle from its original direction and the unknown atom travels away at a 51.8° angle. What is the mass of the unknown atom? [Hint: ...
October 20, 2011 by kago

Chemistry
The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179E-18/n2 J where n is the quantum number that specifies the energy level. What is the frequency in Hz of the radiation emitted when an electron falls from level n = 3 to ...
October 21, 2013 by Steve

chem
λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 5. change the line spectrum to meters you know the equation is Et= Ef-Ei (i think is the equation they want you to use, i ...
October 2, 2006 by Mary

Chemistry
Is it possible for the dispersion forces in a particular substance to be stronger than the hydrogen bonding forces in another substance? I get that in general, LD is weaker than H-bonding, but LD does exist is both polar and nonpolar substances and what if it occurred between ...
December 1, 2007 by Vardaman

chemistry
Methanol (CH3OH) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2 H2(g) CH3OH(g) (a) How many moles of each reactant are needed to produce 4.83 102 g CH3OH? CO mol H2 mol (b) ...
April 3, 2012 by Cat

chemistry
Methanol (CH3OH) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2 H2(g) CH3OH(g) (a) How many moles of each reactant are needed to produce 4.83 102 g CH3OH? CO mol H2 mol (b) ...
April 3, 2012 by Cat

chem
1. under what circumstances is the molecular geometry around a single central atom the same as the electron group geometry around the central atom? 2.If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded to the central atom ...
April 28, 2008 by natash

chemistry
How much energy would be needed to vaporize 150 grams of ethanol when it is at its boiling point? Hear of Vaporization (kj/kg)...841.00
May 23, 2010 by Julia

physics:energy
How much power is needed to push a box (mass 27 kg) over a surface (coefficient of friction μk=0.5) with a velocity of 1.1 m/s?
October 27, 2010 by molly

chemistry
What mass in grams of an aqueous hydrochloric acid solution that is 37.0% by mass hydrogen chloride is needed to supply 2.000 moles of hydrogen chloride?
October 4, 2011 by Li

chemistry
Hydrogen and oxygen react to produce water according to the equation below. 2 H2 + O2 2 H2O How many liters of hydrogen at STP are needed to produce 0.24 mol H2O?
March 27, 2012 by marie

Chemistry
Describe the formation of hydrogen bonds in a hydrogen peroxide, H2O2. Represent possible hydrogen bonding structures in hydrogen peroxide by using structural formulas and the conventional notation for a hydrogen bond.
February 3, 2008 by Lauren

Chemistry
For each of the following, enter the number of covalent bonds that the atom can form: (A) One atom of carbon (B) One atom of sulfur (C) One atom of nitrogen with no net charge (D) One atom of nitrogen with positive net charge (E) One atom of oxygen with no net charge (F) One ...
March 7, 2013 by qwerty

chemistry
Calculate the frequency of electromagnetic radiation emitted by the hydrogen atom in the electron transition from n = 7 to n = 6.
November 7, 2010 by Emily

physics question
find the force exerted by proton and the electron in a hydrogen atom they are 5.0 X 10^-19 coulomb
December 5, 2012 by adithya

Chemistry
HOw does the quantum mechanical orbital differ from a bohr orvit for an electron in a hydrogen atom?
November 8, 2013 by Grace Peterson

science
1, how much energy is needed to run a 40 watt light for 2 hours. 2. how you can tell coal is a more concentrated store of chemical energy than wood is. 3.why is it that the natural realese of carbon from decaying plant and animal material dose not cause global warming but the ...
September 8, 2009 by emmerson

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