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Workbook_Unit2

# Workbook_Unit2 - SC155 Introduction to Chemistry Unit 2...

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SC155 – Introduction to Chemistry Unit 2 – Study Guide Please use the Thinkwell Videos and notes pages (found in Doc Sharing) to help you complete this guide. Section 1 – Key Terms and Concepts proton electron neutron atomic mass atomic number nucleus ion cation anion molecular formula empirical formula isotope *mark page 35 in your textbook* Section 2 – Mathematical Concepts Scientific Notation This notation is a short-hand to express very large or very small numbers. It is merely a mathematical way of saying, “move the decimal point to the left or the right.” The value of 10 x , will tell you how many times and in what direction to move the decimal. Positive values mean move the decimal to the right (very large values). Negative values mean move the decimal to the left (very small values). For example, 3.95 x 10 6 = 3950000. 2.1 x 10 -4 = 0.00021 Section 3 – Practice Problems

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1. What are the following element names? (see period table on page 35 in your text) He = __________________ N = __________________ K = ___________________ Fe = __________________ S = ___________________ Ti = __________________ 2.
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Workbook_Unit2 - SC155 Introduction to Chemistry Unit 2...

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