Thursday, October 6, 2011

Journal Prompt #1:

Journal Prompt #1:
Please answer EACH of the following questions. Write as much information as you need to explain your answer. Use evidence and examples from class to support your explanation. In addition to class examples, you may bring in prior knowledge into your discussion.

You should write about one paragraph (~5 sentences each) per bullet point.
 How has our understanding of the atom changed since Aristotle and Democritus's time?
 What sort of evidence did scientists collect to make their models of the atom? Discuss Rutherford and Thomson.
 Think back to the beginning of the school year… how was your construction of the Enigma Machine similar to what Rutherford and his colleagues did to infer the existence of the nucleus? How were the processes different?

Well, in the beginning, Aristotle and Democritus thought the atom was the lowest you could go. In other words, they thought that there was nothing smaller than an atom and you couldn't break it down any more. They also thought that an atom was a solid sphere whereas we know it to be an undefined shape. We also know that atoms can be broken down even farther into electrons, protons, and neutrons. This shows that since Aristotle and Democritus we have learned that there are even smaller things than atoms and in fact, they are inside atoms. Also, atoms are really an undefined shape because the electrons are bouncing all over the place making it impossible to determine the shape of an atom.

Scientists collected evidence that supported their theories. They collected evidence on the charge of an atom/ electron/ proton/ neutron. They did this by doing experiments such as shooting positively charged alpha particles and finding that some were reflected. This showed that there is a nucleus that is positively charged. Thomson used a Cathode Ray to prove that there are electrons in atoms. Scientist use solid evidence that can be proved through experiments.

Well, we saw the outside of the model but not the inside. That was a mystery to us like the atom's inside was a mystery to early scientists. As we made our models, we had to go through lots of different tests/ experiments. This is also what scientists did as they tried to figure out the inside of an atom. This is shown from Rutherford because he first found that protons were in the nucleus then he collected more data and came up with a second model of an atom. In the end, we used multiple experiments to come to our conclusions just like early scientists did when figuring out an atom.

1 comment:

  1. Hi Kyla! Excellent start! Your writing is easy to read and flows well. I would have liked to hear more about the experiments of Rutherford and Thomson!

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