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SCSU CHE120 Final Exam Questions and Answers (100% Pass)
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SCSU CHE120 Final Exam Questions and Answers (100% Pass)
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©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AMSCSU CHE120 Final Exam Questions and Answers (100% Pass)
What supports the existence of atoms?
(The Laws of Chemical Combination) - ✔️✔️Law of Definite Proportions and Law of
Conservation of Mass
Law of Definite Proportions - ✔️✔️In any chemical compounds the elements are always
combined in a definite proportion by mass
Law of Conservation of Mass - ✔️✔️Mass is neither lost nor created during a chemical
reaction
Dalton's Atomic Theory - ✔️✔️1. Matter is made up of atoms
2. All atoms of the same pure element have the same mass
3. Atoms of different elements have different masses
4. When elements combine to form compounds, they do so in whole number ratios of the
atoms
5. Atoms do not change in a chemical reaction
What did J.J. Thompson discover? - ✔️✔️He discovered the electron by conducting his
Cathode Ray experiment
What did Robert Millikan discover? - ✔️✔️He discovered the charge of the electron by
conducting his Oil Drop experiment
What did Ernest Rutherford discover? - ✔️✔️He discovered the atomic nucleus and that
protons cannot only be located there due to the large mass of the nucleus, but whatever else
was there could not have a charge
Isotopes - ✔️✔️Atoms that have the same number of protons but different number of neutrons
What is a theory? - ✔️✔️The best supported explanation scientists have for some part of nature
based on current evidence
What are the semi-metals? - ✔️✔️• Boron
• Silicon
• Germanium
• Arsenic
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