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WorksheetsChallney yr 9 model of the Atom PBD
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
What did Rutherford's discovery of the nuclear atom imply about the understanding of atomic structure?
a)
Atoms are solid and impenetrable
b)
Atoms have a small, positively-charged nucleus surrounded by empty space
c)
Atoms are made up of negative charges
d)
Atoms have a small, negatively-charged nucleus surrounded by empty space
2.
What were the four elements believed to make up matter in ancient Greece?
a)
earth, wind, fire, water
b)
earth, air, water, metal
c)
earth, air, fire, wind
d)
earth, air, fire, water
3.
What did J J Thomson's plum pudding model propose?
a)
atoms consist of two types of static electricity
b)
atoms are solid throughout
c)
atoms are made up of positive dough and negative electrons
d)
atoms can be squashed
4.
Why was it significant to use a vacuum in the experiment?
a)
To increase the speed of alpha particles
b)
To reduce the thickness of gold foil
c)
To prevent deflections of alpha particles
d)
To create a controlled environment
5.
What did Rutherford conclude based on the observation that a small number of alpha particles were deflected at large angles?
a)
There is an equal distribution of positive and negative charges in the atom
b)
There is a concentration of negative charge in the atom
c)
There is a concentration of positive charge in the atom
d)
There is no charge present in the atom
6.
What was the purpose of the experiment conducted by Ernest Rutherford?
a)
To measure the thickness of gold foil
b)
To study the behavior of alpha particles
c)
To test the plum pudding model
d)
To observe the effects of vacuum
7.
What is the significance of the observation that most alpha particles went straight through the foil?
a)
It suggests that the atom is made up of negative charges
b)
It suggests that the atom is made up of positive charges
c)
It suggests that the atom is mostly empty space
d)
It suggests that the atom is solid and impenetrable
8.
What does the term 'atomos' mean?
a)
invisible
b)
expanding
c)
indestructible
d)
uncuttable
9.
What is the relationship between positive charges and the deflection of alpha particles?
a)
Positive charges attract alpha particles
b)
Positive charges repel alpha particles
c)
Positive charges have no effect on alpha particles
d)
Positive charges absorb alpha particles
10.
What evidence supported Thomson's plum pudding model?
a)
atoms consist of two types of static electricity
b)
atoms can be transferred as they collide
c)
solids cannot be squashed
d)
atoms are solid throughout
11.
What were the observations made by Rutherford during his experiment?
a)
All alpha particles were deflected by large angles
b)
No alpha particles came straight back off the foil
c)
All alpha particles were absorbed by the foil
d)
Most alpha particles passed straight through the foil
12.
Why was gold chosen for the experiment?
a)
It was easy to obtain
b)
It had unique electrical properties
c)
It was the most abundant metal
d)
It could be rolled out to be very thin
13.
According to Rutherford's model, what is the structure of an atom?
a)
A small, positively-charged nucleus surrounded by empty space
b)
A small, negatively-charged nucleus surrounded by electrons
c)
A large, negatively-charged nucleus surrounded by empty space
d)
A large, positively-charged nucleus surrounded by electrons
14.
According to Demokritos, what is the nature of atoms?
a)
expanding
b)
invisible
c)
uncuttable
d)
indestructible
15.
What did Niels Bohr's model explain about the colors emitted during a chemical reaction?
a)
The colors depend on the number of electrons in the atom
b)
The colors are random
c)
The colors depend on the energy released by electrons in the chemical reaction
d)
The colors depend on the size of the nucleus
16.
What were the unexpected results of the experiment?
a)
Most alpha particles passed straight through the foil
b)
Alpha particles punctured the gold foil
c)
No alpha particles reached the gold foil
d)
All alpha particles were deflected by large angles
17.
What were the implications of the results on the plum pudding model?
a)
The model needed further refinement
b)
The model was supported by the results
c)
The model was proven to be incorrect
d)
The model was confirmed to be accurate
18.
What are the components of an atom?
a)
Neutrons and electrons
b)
Electrons and protons
c)
Protons and neutrons
d)
Protons and electrons
19.
What did Niels Bohr propose about the electrons in an atom?
a)
They are located in the nucleus
b)
They are randomly arranged
c)
They orbit the nucleus in different energy levels
d)
They have fixed levels of energy within each type of atom
20.
Who revised Rutherford's model of the atom?
a)
Niels Bohr
b)
James Chadwick
c)
J.J. Thomson
d)
Ernest Rutherford
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