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Understanding Chemical Formulas and Oxidation States in Chemistry

This guide provides a comprehensive overview of chemical formulas, focusing on their components such as symbols, subscripts, and formula mass. It explores various examples, such as the structure of carbon tetrafluoride (CF4) and the formula for aluminum sulfate. Additionally, the guide addresses key concepts, including oxidation numbers in compounds. By studying compounds like Ni(ClO3)2 and SO3, along with calculations of formula mass for ethyl alcohol (C2H5OH), learners will strengthen their grasp of fundamental chemistry principles.

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Understanding Chemical Formulas and Oxidation States in Chemistry

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  1. Chemistry Daily 10’s Week 10

  2. 1 1. A chemical formula includes the symbols of the elements in the compound and subscripts that indicate A. atomic mass of each element. B. number of atoms or ions of each element that are combined in the compound. C. formula mass. D. charges on the elements or ions.

  3. 2. How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF4? a. 1 b. 2 c. 4 d. 5

  4. 2 1. What is the formula for aluminum sulfate? a. AlSO4 b. Al2SO4 c. Al2(SO4)3 d. Al(SO4)3

  5. 2. Name the compound Ni(ClO3)2. a. nickel(II) chlorate c. nickel(II) chlorite b. nickel(II) chloride d. nickel(II) peroxide

  6. 3 1. Name the compound SO3. a. sulfur trioxide b. silver trioxide c. selenium trioxide d. sodium trioxide

  7. 2. What is the oxidation number of oxygen in most compounds? a. –8 b. –2 c. 0 d. +1

  8. 4 1. What is the oxidation number of a pure element? a. –1 b. 0 c. +1 d. 8

  9. 2. What is the oxidation number of sulfur in SO2? A. 0 B. +1 C. +2 D. +4

  10. 5 1. What is the formula mass of ethyl alcohol, C2H5OH? A. 30.33 amu B. 33.27 amu C. 45.06 amu D. 46.08 amu

  11. 2. The empirical formula is always the accepted formula for a(n) A. atom. B. molecule. C. molecular compound. D. ionic compound.

  12. Answers & Standards • 1.1 b sc1d • 1.2 c sc1d • 2.1 c sc1d • 2.2 a sc1d • 3.1 a sc1d • 3.2 b sc1d • 4.1 b sc1d • 4.2 d sc2c • 5.1 d sc2c • 5.2 d sc2c

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