The Modern Atomic theory assignment and quiz

Which event would be impossible to explain by using John Dalton's model of the atom? An iron atom emits particles when it is struck by light. An oxygen atom combines with two hydrogen atoms to form water. An acid reacts with a base to form salt and water. The atoms in sodium metal react with water.

An iron atom emits particles when it is struck by light.

Compare the modern (electron cloud) model of the atom with Dalton's atomic model. Which of these statements describe the two models correctly? Check all of the boxes that apply. Dalton's model was replaced only because of its age. Dalton's model represented atoms as indivisible, but the modern theory recognizes that they contain smaller particles. The modern model explains all available data about atoms; Dalton's model does not. The modern model is more widely accepted because it was proposed by more well known scientists.

Dalton's model represented atoms as indivisible, but the modern theory recognizes that they contain smaller particles. The modern model explains all available data about atoms; Dalton's model does not.

Describe the photoelectric effect and explain why it made modifications to the Rutherford model necessary.

Did your answer include all of the following? According to the Rutherford model, light of any energy should be able to make electrons leave the atom and be emitted. The energy of the emitted electrons should be related to the intensity of the light. Electrons are emitted only for certain wavelengths, and those wavelengths vary from atom to atom. The energy of the emitted electrons depends on the energy of the light, not its intensity.

Describe the main difference between the Bohr model and the electron cloud model of the atom.

Did your answer include all of the following? In the Bohr model, an electron's position is known precisely because it orbits the nucleus in a fixed path. In the electron cloud model, the electron's position cannot be known precisely. Only its probable location can be known.

Scientists made the following two observations about emission spectra: Each element has a unique emission spectrum. Atoms emit energy only at specific wavelengths. Describe how the Bohr model explains both of these observations.

Did your answer include all of the following? In the Bohr model, electrons can exist only in certain energy levels surrounding the atom. When electrons jump from a higher energy level to a lower one, they emit light at a wavelength that corresponds to the energy difference between the levels. The energy levels in each atom are unique.

Describe the main difference between the Bohr model of the atom and the Rutherford model.

Did your answer include all of the following? In the Rutherford model, electrons can exist in any location outside the nucleus. In the Bohr model, electrons can exist only in certain energy levels surrounding the atom.

Which equation was used by Albert Einstein to explain the photoelectric effect? [E = energy, h = Planck's constant, and v = frequency.] E = h/v E = hv E = v/h E = h - v

E = hv

Which statement about Niels Bohr's atomic model is true? Higher orbits have lower energies. Each orbit has a specific energy level. Electrons can exist in any energy level. Orbits close to the nucleus have no energy.

Each orbit has a specific energy level.

The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. Which is a correct explanation of the photoelectric effect according to the model? Electrons are emitted with more speed when brighter light strikes them. Electrons need small amounts of energy to be released from an atom. Electrons move between levels only if they are hit by the right frequency of light. Electrons need specific amounts of energy to jump levels and be emitted.

Electrons need specific amounts of energy to jump levels and be emitted.

According to the Bohr model of an atom, what happens when an electron moves from the second energy level to the third energy level and then back to the second energy level? Energy is absorbed and then stored in the atom. Energy is released and then absorbed to form an absorption line. Energy is absorbed and then released to form an emission line. Energy is released from the atom, and the outer level is weakened.

Energy is absorbed and then released to form an emission line.

he diagram shows Niels Bohr's model of an atom. mc010-1.jpg What happens when the electron moves from the first energy level to the second energy level? Energy is absorbed, and an emission line is produced. Energy is released, and an emission line is produced. Energy is absorbed by the atom. Energy is lost from the atom.

Energy is absorbed by the atom.

Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect? Light is made up of extremely small particles. Particles that are emitted from a strip of metal are electrons. Shining light on a metal strip produces emissions. Energy of electrons depends on light's frequency, not intensity.

Energy of electrons depends on light's frequency, not intensity.

Which statement describes a major drawback of the Bohr model that caused scientists to replace it? It worked only for helium and larger atoms. It did not identify the distance between an electron and the nucleus. It contradicted the Heisenberg uncertainty principle. It stated that spectral lines of atoms are similar.

It contradicted the Heisenberg uncertainty principle.

Which statement about the electron-cloud model is true? It is the currently accepted atomic model. It can easily be replaced by existing models. It specifies the location and momentum of an electron. It does not explain the formation of emission lines.

It is the currently accepted atomic model.

The modern-day quantum model of the atom is better than John Dalton's model because it... is easier to understand. is a more recent theory. can be represented in two dimensions. answers many questions about atoms.

answers many questions about atoms.

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

bright red light

Natalie observes these characteristics in the model of an atom. (i) includes positive charge (ii) contains electrons (iii) explains the photoelectric effect (iv) suggests the probable location of electrons Which model is Natalie most likely examining? Bohr model Dalton's model plum pudding model electron-cloud model

electron-cloud model

Which atomic model states that it is impossible to know the exact location of electrons around the nucleus? Bohr model Dalton model plum pudding model electron-cloud model

electron-cloud model

A change in which property of light will have no effect on whether or not the photoelectric effect occurs? frequency energy intensity wavelength

intensity

Light of a certain energy shines on a metal and causes electrons to be emitted. Based on the research of Albert Einstein, what change would most likely result in stopping the emission of electrons from this metal? an increase in the intensity of the light a decrease in the intensity of the light the use of light that has a higher frequency the use of light that has a lower frequency

the use of light that has a lower frequency