Chemistry, 05.09.2019 16:20 gamerhunter425

The four lines observed in the visible emission spectrum of hydrogen tell us that: select one: a. the hydrogen molecules they came from have the formula h4. b. we could observe more lines if we had a stronger prism. c. there are four electrons in an excited hydrogen atom. d. only certain energies are allowed for the electron in a hydrogen atom. e. the spectrum is continuous.

Answers: 2

Show answers

Answers

Answer from: brackendillman

The answer is D, only certain energies are allowed for the electron in a hydrogen atom.

Explanation:

We know that light quanta, also called photons have energy:

E= h f Where h is Planck's constant and f is the frequency of the photon. The frequency of a photon tells us the colour of the light, different colours have different frequencies, and white light contains photons of all frequencies in the visible range. But the light emitted by Hydrogen in a low pressure tube that is excited by an electric current contains only photons from a few frequencies.

Why is that? Quantum mechanics explains us that it is because an electron that is bound to a hydrogen atom can take many configurations, of different energies, the configuration for which the electron is as close as possible to the nucleus (in this case a single proton) is called the ground state, and the other higher energy states are called excited states. if an electron is in an excited state, it will tend to "jump" down into the ground state, emitting light in the process. That light is the light we see, and its spectrum is discrete because only a few energies are allowed for the electron in a hydrogen atom.

That is why D is true.

Why are the other questions wrong?

A: Wrong because hydrogen can only form H_2 molecules, and even so, the great energy levels in the tube destroy the molecule leaving only single free H atoms.

B: The prism's only job is to separate light into different frequencies so that we can see the different colours, it won't block any lines.

C: Wrong because hydrogen atoms only have a single electron.

E: wrong because if the spectrum was continuous we wouldn't see single lines, but a continuous range of colours, like in white light.

Answer from: Quest

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

Answer from: Quest

the answer is option a.

Another question on Chemistry

Chemistry, 22.06.2019 10:40

Ammonia and oxygen react to form nitrogen monoxide and water, like this: 4nh3 (g) + 5o2 (g) → 4no (g) + 6h2o (g) also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the following composition: compound pressure at equilibrium nh3 65.1atm o2 31.3atm no 62.7atm h2o 65.8atm compound pressure at equilibrium nh3 65.3 atm o2 7.79 atm no 12.1 atm h2o 65.8 atm calculate the value of the equilibrium constant kp for this reaction. round your answer to 2 significant

Answers: 2

Answer

Chemistry, 22.06.2019 11:20

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

Answers: 1

Answer

Chemistry, 22.06.2019 19:10

How does the atmosphere to make earth livable? check all that apply. causes the seasons contains oxygen provides warmth creates important nutrients blocks harmful energy from the sun plz like !

Answers: 2

Answer

Chemistry, 22.06.2019 19:30

Draw the lewis structure for the trisulfur s3 molecule. be sure to include all resonance structures that satisfy the octet rule.

Answers: 3

Answer

You know the right answer?

The four lines observed in the visible emission spectrum of hydrogen tell us that: select one: a....

Questions