General Chemistry Online: Companion Notes: Compounds: Classifying compounds: Quiz: Interpret formulas

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Compounds

Classifying compounds

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1. The number of carbon atoms in 5 molecules of oxalic acid, H₂C₂O₄, is

2. The structures of the male and female sex hormones testosterone (C₁₉H₂₈O₂) and estradiol (C₁₈H₂₄O₂) are remarkably similar considering their profoundly different effects. Three molecules of testosterone contains how many more carbon atoms than three molecules of estradiol?

none of these

3. The compound SF₆ is a colorless, odorless, extremely heavy gas, about 5 times as dense as air. A sample of 100 molecules of SF₆ contains

6 S and 6 F

1 S and 6 F

600 S and 600 F

100 S and 600 F

4. The deadly nerve gas tabun, (CH₃)₂NP(O)(C₂H₅O)(CN), was manufactured by the Germans in World War II but never used. A sample containing traces of tabun is found to contain 2.4 x 10¹⁹ nitrogen atoms. The maximum number of tabun molecules that the sample could contain is:

2.4 x 10¹⁹

4.8 x 10¹⁹

none of these

0.9 x 10¹⁹

1.2 x 10¹⁹

5. The ratio of carbon to hydrogen in acetic acid, HC₂H₃O₂, is:

3:2

2:3

none of these

2:1

1:2

6. Stearin, C₃H₅(C₁₈H₃₅O₂)₃, is a constituent of most animal fats and is used for making soap, candles, and candies. How many carbon atoms are in one molecule of stearin?

none of these

General Chemistry Online! Quiz: Interpret formulas