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chemistry quiz 2 over atoms questions and answers
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chemistry quiz 2 over atoms
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chemistry quiz 2 over atomsWhen was the idea of an atom first developed? Describe this theory. - answer
Democritus was the first person to think about atoms in 400B.C. He called them
"atomos." He believed that all matter was composed of atoms.
In your own words, state the 4 major ideas of Dalton's Atomic Theory. - answer#1
Dalton believed that all matter contained particles called atoms. These particles were
believed to not be able to be broken into smaller components.
#2 Atoms of a particular element are the same, but atoms of a different element are
different.
#3 Dalton believed that atoms always combined in whole number ratios. Which means it
is not possible to have fractional parts of an atom combining to make a new substance.
#4 Dalton believed that atoms combined to form new chemical combinations by
rearranging themselves during chemical reactions. Dalton believed that if one were to
start out with an atom of copper for example, it cannot be converted into an atom of
iron.
Which of these statements would Dalton have agreed with? Use Dalton's law to explain
your answer.
Atoms are the smallest particles of matter.
The mass of an iron atom is different from the mass of a copper atom.
Every atom of silver is identical to every other atom of silver.
A compound is composed of atoms of two or more different elements. - answerDalton
would have agreed with a) because of the belief that all matter is comprised of
indivisible particles called atoms.
Dalton would have agreed with b) and c) because his postulate says that atoms of one
element would differ from atoms of another element. But all atoms of the same element
are identical to each other.
Both Democritus and Dalton proposed that matter consists of atoms. Explain how their
approaches to reaching the same conclusion differed. - answerDemocritus was a
philosopher that merely just thought about an atom's existence. He did not have
experimental evidence to prove this idea.
However Dalton did have evidence through the use of his experiments in meteorology.
Describe the experiment that led to the discovery of the electron. - answerJ. J.
Thompson discovered the electron through the use of his Cathode Ray Tube
experiment. Inside this tube was a gas, and the particles of the gas were attracted to the
positively charged plate within the tube. From this observation, he concluded that the
new particle discovered was negatively charged.
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