Watch the video and answer the following questions.
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Around 440 BCE, Democritus first proposed that everything in the world was made up of tiny ___ surrounded by ___ ___ and he even speculated that they vary in ___ and ___ depending on the ___ they compose. He called these particles ___.
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Who disagreed with Democritus?
A. Aristotle
B. John Dalton
C. J. J. Thompson
D. Ernest Rutherford -
Aristotle believed that matter was made of four elements: __,__, ___ and ___.
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John Dalton showed that common substances always ___ ___ into the same elements in the same __. For example, water can break down into __, ___ and __. Another example, like carbon dioxide, it can be broken down into __, ___ and __. The various combinations of atoms of different elements have a particular __ and ___ that could neither be ___ nor ___ .
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Development of the Atom models. Please use words and drawings if necessary to explain the differences or development of each model. (1) J. J. Thompson, the chocolate chip cookie model
The discovery of __
Atoms as uniformly packed spheres of __ matter filled with ___ charged electrons
(2) Ernest Rutherford
The father of the ___ __
while most of the particles did __, some
Atoms consisted largely of empty space with just a few electrons while most of the ___ was ___ in the centre which he termed the nucleus. The alpha particles ___ ___ the gaps but ___ ___ from the dense positively charged nucleus.
(3) Niels Bohr
Electrons orbit the nucleus at ___ ___ and ___ able to jump from one level to another but not to exist in the space between.
(4) Other experiments
Rather than simply being discrete particles, electrons ___ behaved like __, not being __ to a ___ point in space.
(5) Werner Heiseberg
It was impossible to determine both the ___ ___ and ___ of electrons as they moved around an atom. -
Now, look back to 440 BCE, was Democritus correct? Why do you think so?
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Please summarise the history timeline: person’s name, main theory, new terms etc.
ANSWER SHEET
- particles, empty space, size, shape, substance, Atomos.\
- A\
- earth, wind, water, fire\
- broke down, proportions; oxygen, hydrogen, hydrogen; carbon, oxygen, oxygen; size, mass; created, destroyed\
- (1) Electrons, positive, negatively
(2) Nuclear age; mass, concentrated, passed through, bounced back
(3) fixed, energies, distances
(4) simultaneously, waves, confined, particular
(5) exact, position, speed\ - Yes.
