9. 16.15
Today we learned about Dalton's Atomic Theory. Dalton was the first to discover subatomic particles. He did not know of subatomic particles. Some of his theories have been proven wrong, but some are still true and fundamental (Ex. All elements are composed of atoms.) Another thing talked about was the Law of Constant Composition, which tells us that a given compound always contains the same Proportion by Mass (Percent Composition.) Another scientist, JJ Thomson, found the subatomic particle, electron, with a negative charge.He used the "Chocolate Chip Model" - Electrons placed randomly in a positive matrix. Ruthford, a student of Thomson, discovered positively charged protons by the Gold Foil experiment. He also found the nucleus, a small and dense area containing protons.
More info: http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html
I agree that we learned all these concepts on the first day of this unit. All these various theories helped provide background information for atoms. Also, I definitely agree that the pre-test was extremely difficult, but after the first lesson, I began to understand some of the difficult concepts on the test.
ReplyDeleteI agree with Erin that all of these theories help to make the knowledge that we have today of atoms. This unit appears to be hard but i have faith i will soon understand it.
ReplyDeleteI agree with Erin that all of these theories help to make the knowledge that we have today of atoms. This unit appears to be hard but i have faith i will soon understand it.
ReplyDeleteIt is interesting how even though Dalton could identify an atom, he could not identify in depth characteristics and subatomic particles. I guess everyone has to start somewhere.
ReplyDeleteI respectfully disagree with Graeme. According to me, the only reason Dalton was unable to find the subatomic particles was because at the time, technology wasn't advanced enough to look deeper into a molecule and find subatomic molecules. They just didn't have the technology available during Dalton's time.
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