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

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Compounds

Classifying compounds

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1. Realgar, As₂S₂, is a soft red-orange mineral that was once used in colored fireworks. An explosion that releases a million atoms of arsenic could contain how many molecules of realgar?

5 x 10⁵

1 x 10⁵

2 x 10⁶

1 x 10⁶

2 x 10⁵

2. 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

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

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

none of these

1.2 x 10¹⁹

4.8 x 10¹⁹

0.9 x 10¹⁹

5. Phenylmercuric borate, (C₆H₅Hg)₂HBO₃, was once used as a mildewproofing agent. A wood sample sprayed with 4.8 x 10¹⁸ molecules of phenylmercuric borate could contain how many mercury atoms?

4.8 x 10¹⁸

9.6 x 10¹⁸

2.4 x 10¹⁸

none of these

6. How many atoms are in two molecules of blood sugar (C₆H₁₂O₆)?

none of these

General Chemistry Online! Quiz: Interpret formulas