Chapter 5 Flashcards
What did the ancient greeks propose, that was later proven correct?
That all matter was made up of indivisible particles, Democritus called these atomos
Who said “Nothing exists except atoms and empty space; everything else is opinion”
Democritus
What idea replaced the Greeks proposal of atoms?
alchemy
who proposed alchemy and the idea that matter is simply made up of simply earth, water, air, and fire?
Aristotle
who first conducted quantitative experiments that suggested that matter was more complicated than previously thought?
Robert Boyle
who proposed the definition for elements, which defined them as any material that was a single
substance that could not be broken down anymore?
Robert Boyle
What did Dalton contribute to atomic connaissance?
his atomic theory:
- 1. All matter is composed of tiny particles called atoms, which
can’t be broken down, created or destroyed
2. Atoms of a given element are identical to each other, but
different from those of other elements
3. Atoms of different elements combine in specific ratios to
form compounds
4. In a chemical reaction, atoms separate, rearrange and
recombine to form new compounds
what did Crookes, via his Crookes tube, help discover about atoms/matter?
he helped with the discovery of charged particles, specifically the electron
def. stream of negatively charged particles, who are subatomic in size
cathode rays
who discovered the electron?
JJ Thomson
With the discovery of electrons, Thomson created what atomic model?
the plum-pudding model
What two things did Thomson’s work establish?
- Atoms are made of even smaller pieces of matter
- Those subatomic pieces of matter carry
electrostatic charges, establishing the electronic
nature of atoms that underpins modern chemistry
Rutherford’s study of what led to further development of the atomic structure?
radioactivity
what type of radioactivity did Rutherford and his team discover?
alpha decay
