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CHEM 100 Chemistry and Society Winter Quarter 2008 SCCC Lecture 39

CHEM 100 Chemistry and Society Winter Quarter 2008 SCCC Lecture 39. Now we have a little time to look at some of what we have covered previously. We have looked at how to tackle several different types of questions: questions where you are asked to explain a concept.

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CHEM 100 Chemistry and Society Winter Quarter 2008 SCCC Lecture 39

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  1. CHEM 100 Chemistry and Society Winter Quarter 2008 SCCC Lecture 39 Now we have a little time to look at some of what we have covered previously..

  2. We have looked at how to tackle several different types of questions: • questions where you are asked to explain a concept. • multiple choice questions. • designing an experiment to find something out about a system. • calculate a particular quantity. To do well in this course you need to be able to answer all these kinds of questions effectively.

  3. “Identify each of the following substances as either an element or compound. • Sugar • Carbon • Lead • Rust” (a) compound, (b) element, (c) element and (d) compound

  4. “Which formula below corresponds to the compound containing one magnesium atom, one sulfur atom and four oxygen atoms? What is the name of this compound? • So3PO4 • MgSO4 • MgSuO4 • MgSO4” (d) MgSO4 the name of this compound is magnesium sulfate.

  5. “Write the prefix for multiplying by each of the numbers below • 0.01 • 1,000,000 • 0.000001” • x 10-2centi • x 106mega • x 10-6micro

  6. “Explain the scientific method” • There are three main steps in the scientific method: • perform experiments on system and record observations. • analyze data and propose hypothesis to explain results of experiments. • perform additional experiments to test hypothesis. • If our additional experiments confirm hypothesis the hypothesis becomes a theory. If not we must revise our hypothesis and perform additional experiments to test it. The process continues until our hypothesis and experiments agree.

  7. “Place the following scientists in chronological order of their contribution to atomic theory: • Lavoisier • Democritus • Dalton • J. J. Thompson” (b) (a) (c) and (d)

  8. “Can a theory be disproved” A theory can be disproved if experimental data is shown to be in disagreement with it.

  9. “What type of elements form covalent compounds” Covalent compounds generally form between non-metals with that do not have very large differences in electronegativity.

  10. “What is a polyatomic ion? Provide several examples” Polyatomic ions are ions composed of more than one atom. Examples include NH4+, CN-, SO42- and CO32-.

  11. There will be class on Monday and Tuesday next week. We will mainly be doing practice problems in class so this is a very good chance to get some exam revision done.

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