16 Questions
Who first proposed the concept of atoms?
Leucippus and Democritus
What is the Greek word for 'indivisible'?
Atomos
According to Dalton's Atomic Theory, what is matter composed of?
Exceedingly small particles called atoms
According to Dalton's Atomic Theory, what is the smallest unit of an element that can participate in a chemical change?
Atom
Which Greek philosopher proposed the concept of atoms along with Leucippus?
Democritus
What did Aristotle and others believe matter consisted of?
Various combinations of the four 'elements'
According to Dalton’s Atomic Theory, which postulate states that atoms of one element differ in properties from atoms of all other elements?
Postulate 3
In Dalton’s Atomic Theory, which postulate explains that a compound consists of atoms of two or more elements combined in a small, whole-number ratio?
Postulate 4
According to the Law of Conservation of Matter (Mass), what happens during a chemical change?
The total mass of matter remains constant
Which experiment by French chemist Joseph Proust illustrates the Law of Definite Proportions (Constant Composition)?
Constant Composition of Isooctane (C8H18)
What does Dalton’s Atomic Theory postulate about atoms during a chemical change?
Atoms rearrange to yield different types of matter
Which element has atoms with a characteristic mass of 55.847 atomic mass units?
Iron (Fe)
What is the characteristic mass of Carbon atoms according to the provided text?
12 atomic mass units
In a given compound according to Dalton's Atomic Theory, what is always present in the same ratio?
$NaCl$ molecules
'Atoms are neither created nor destroyed during a chemical change, but instead rearrange to yield a different type(s) of matter.' Which law or postulate does this statement reflect?
'Atoms are neither created nor destroyed during a chemical change, then the total mass of matter present when matter changes from one type to another will remain constant' - Law of Conservation of Matter (Mass)
'Every water molecule has exactly two hydrogen (H) atoms for every one oxygen (O) atom, always in a 2:1 ratio.' Which compound does this statement describe?
$H_2O$
Explore the early ideas and concepts of the atomic theory, including the proposal of atoms by Greek philosophers and the evolution of the atomic theory. Learn about the study of matter and its interactions with other matter in the context of chemistry.
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