Evidence for Atoms Flashcards
How many times can you split a chocolate bar?
How long ago was this thought about?
2500 years ago.
Who believed you couldn’t keep ripping up something?
The Greeks and Indians.
What did the Greeks and Indians think?
That everything was made up of tiny particles with gaps between. You cannot see or break them.
What did the Greeks call these miniature particles that made up things (Elements)?
Atoms
What did philosophers do?
They made thought experiments and use creative thought.
Which two Greek Philosophers said that Atoms are the smallest matter that exists?
Leucippus and Demitrius.
Who firstly found evidence for Atoms?
John Dalton
In which year did Dalton make 200,000 weather entries?
1787
What did Lavoisier discover?
Lavoisier discovered that air contains at least 2 gases.
What did Dalton discover after Lavoisier?
Dalton discovered water particles mixed within air but had not joined.
He said that water and air must be made of separate different particles.
What did Dalton discover in his experiments?
Dalton discovered that many gases reacted the same a water and air and mixed but didn’t combine.
What process do you go through to get an answer?
Ask a question : Suggest an explanation : Test the explanation : Check the evidence.
What did Dalton’s models include?
Each Element has its own type of Atom and each have different masses.
Compounds form when different Atoms join.
Atoms are rearranged in chemical-reactions.
