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Chemistry
10th -
12thgrade
The Atomic Nucleus - Gold Foil Experiment
16 questions
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- 1. Multiple Choice
Choose the correct description of J. J. Thomson's Model of an Atom.
The model is a indivisible and indestructible sphere
The model is a sphere in which negatively charged particles - electrons- immersed in a positively charged space of the sphere.
The model is a sphere in which negatively charged particles - electrons- move around the center of an atom creating an electron cloud
The model is a sphere in which negatively charged particles - electrons - move around the nucleus of an atom in a defined passes, called orbits, like planets around the sun
- 2. Multiple Choice
What is the name of J.J. Thomson's Model of an Atom?
Jimmy Neutron Model
Solar System Model
Plum-Pudding Model
Quantum mechanical Model
- 3. Multiple Choice
Who was Ernset Rutherford?
English Science teacher who developed the first Atomic Theory
English physicist who discovered an electron
German physicist who discovered a proton
New Zealand born physicist who established existence of a positively charged nucleus in an atom
- 4. Multiple Choice
Why did Ernest Rutherford and his colleagues perform the Gold-Foil Experiment?
They wanted to test and confirm the Plum-Pudding model
They wanted to test John Dalton's Model
They were looking for electrons
They wanted to come up with their own Atomic Model
- 5. Multiple Choice
What is an alpha particle?
It is a dominant particle in a subatomic world
It is a particle that has 2+ charge
It is a particle that has 2- charge
It is a helium atom without a charge
- 6. Multiple Choice
What results did Rutherford expect to see if the Plum-Pudding model is correct?
He expected that most of alpha particles would go through a gold-foil and small number of particles would deflect sightly
He expected that most of alpha particles would not go through a gold-foil and will stop on one side of a foil.
He expected that most of alpha particles would ricochet back after hitting a gold-foil
- 7. Multiple Choice
What results did Rutherford observe in his Gold-Foil experiment?
He observed that all alpha particles did go through a gold-foil in straight lines
He observed that most alpha particles did not go through a gold-foil and stopped on one side of the gold foil.
He observed that a small number of alpha particles bounced off the gold-foil at very large angles
He observed that all alpha particles slightly deflected from the straight line when going through a gold-foil
- 8. Multiple Choice
Choose one of the conclusions that Ernest Rutherford made based on the experimental results of his Gold-Foil experiment
He concluded that the atom is indivisible
He concluded that the atom is mostly empty space
He concluded that the atom has neutrons
He concluded that the atom is tightly packed with subatomic particles all mixed together
- 9. Multiple Choice
Choose one of the conclusions that Ernest Rutherford made about the mass of the atom, based on the experimental results of his Gold-Foil experiment
He concluded that almost all mass of the atom is distributed evenly among subatomic particles
He concluded that almost all mass of the atom is distributed among electrons
He concluded that almost all mass of the atom is concentrated in a small region, in a center of an atom, that has a positive charge
He concluded that almost all mass of the atom is concentrated in a small region, in a center of an atom, that has a negative charge
- 10. Multiple Choice
Based on the experimental results of his Gold-Foil experiment, Ernest Rutherford concluded that
The very dense center of the atom has a positive charge
The very dense center of the atom has a negative charge
The very dense center of the atom has no charge
The atom doesn't have a center and all particles are distributed evenly like in a chocolate chip cookie
- 11. Multiple Choice
What is the nucleus of the atom?
It is a centra organel of a cell
It is a center of a fruit
It is a very dense cenral core of an atom that has a positive charge
It is a very dense cenral core of an atom that has a negative charge
- 12. Multiple Choice
What subatomic particles are in the nucleus of an atom?
Only protons
Protons and neutrons
Only neutrons
Only electrons
Protons and electrons
- 13. Multiple Choice
Based on Rutherford's model of the atom, electrons in the atom are located
inside of the nucleus of the atom
outside and around the nucleus of the atom
outside and inside of the nucleus of the atom
- 14. Multiple Choice
What is the average size of an atom?
1 nm
1 m
1 0A
1 pm
- 15. Multiple Choice
If the atom has 25 electrons, how many protons does it need to have to be neutral?
5 protons
25 protons
it doesn't need protons
15 protons
- 16. Multiple Choice
If one of the reagent of a chemical reaction is a piece of copper metal, what would happen with copper at the end of the reaction?
Copper will transform into another metal, like gold
Copper will stay copper but may combine with atoms of other elements in the reaction, forming a new substance
Copper will not combine with atoms of other elements and we will be able to get it back by simple filtration
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