Chapter 1-Atoms in the eyes of philosophers Flashcards
(33 cards)
The 4 properties of elements that are imparted by different proportions
Fire, air, wind and earth
Aristotle disproved the idea of having only 4 elements and decided to create a fifth element. From which philosopher did he disprove the idea of having 4 elements and what was the 5th element?
Empedocles.
Aether or ether.
All matters are composed of very small particles called atoms. Who was the Philosopher that supported the idea of the Particle theory?
Democritus
What does the Greek word “atomos” mean?
Atoms, duhh ay joke INDIVISIBLE pala
Was Democritus supported by the experiment? Yes or no?
Nope.
This philosopher said that “all matter is continuous and can be infinitely divided into smaller pieces”.
ARISTOTLE
What law did Joseph proust propose? Also, state the law
Proposed: Law of definite proportions
States: a given chemical compound always contains its component elements in fixed ratio (by weight)
Law of proportions
The ratio is the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers.
Who came up with the law of proportions? And what did it trigger?
John dalton bc he came up with a theory that signaled the beginning of a modern era in chemistry.
2 or more diff compounds are composed of the same 2 element.
What was the first part of dalton’s atomic theory?
- Elements are made up of small indivisible particles called atoms
What are atoms composed of?
Protons, neutrons and electrons
T or F. Atoms are visible
False; divisible
What was the second part of dalton’s theory?
- The mass and other properties of all atoms are the same.
-Atoms of different elements differ in mass & other properties
> was unacceptable bc of isotopes
>atoms has the same element but different mass number
What was the third part of dalton’s theory?
- Compounds are composed of atoms of more than one element.
-Constituent atoms are present in the constant whole no. ratio.
>this third postulate also supports the findings of Joseph Proust
> dis also supports the LAW OF MULTIPLE PROPORTIONS
What is an isotope?
Mh
What was the fourth part of dalton’s theory?
- In a chem reaction, atoms are neither created no destroyed.
- they combine, separate or rearrange
Mass is neither added nor destroyed during a chemical reaction
LAW OF CONSERVATION OF MASS
He arranged the known elements in a periodic table based on their atomic masses
DIMITRI MENDELEEV
The tiniest particle of an element that retains the chemical properties of that element
Atom
T or F.
All atoms are made up of the nucleus and the electrons
True
What is composed of protons and neutrons located at the center of an atom?
A nucleus
Nucleons.
Idek
Who discovered the x-ray in 1895?
Wilhelm Röntgen
He accidentally learned that the darkening of the tricky wrapped photographic plates occurs after exposing then to a uranium compound.
Antoine Becquerel
