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1. In 1897, J.J. Thomson discovered a subatomic particle using a cathode ray tube. Which particle was it?
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Proton
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Alpha particle
β1. Yesterday, the student ____ the chemistry experiment in the lab.
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β2. Ernest Rutherford performed the gold foil experiment. What did he conclude about the center of the atom?
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65%
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10%
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2%
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2. We ____ the law of supply and demand in our economics class last week.
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β3. When John Dalton developed his atomic theory, how did he describe atoms?
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11%
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9%
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3. The teacher ____ us five difficult questions during the last period.
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4. A student looked at an element with atomic number 11. How many protons did that atom have?
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4. They ____ to the library to find books about atomic structure.
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β5. During an experiment, an atom lost an electron. What did the atom become?
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A positive ion (cation)
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A new element
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β5. I ____ my homework before I went to sleep.
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finish
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Chemistry model exam For Practice.pdf
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π αααα αααα α°ααͺαα½ α¨ααα α₯α«α αααα£α΅ α₯αα For Natural student Chemistry grade 9 unit 2 α₯α α¨α°αα«α© English past tense α₯α«ααα½α α ααα α°α α₯αα α₯ααΉααα α€ α₯ααα α Concept α₯α«αα α£α½α α α₯αα π
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