In an aqueous solution the [H3O+] is 2.0 x 10^-6 M. What is the [OH-]?
A) 5.0 x 10^-9 M
B) 1.0 x 10^-7 M
C) 2.0 x 10^- 6 M
D) 1.0 x 10^8 M
A
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A conformal map projection is one that
A. allows only a hemisphere or less of the Earth's surface to be shown on a map. B. is based on the idea of projecting the image on all or part of the globe onto a cone. C. preserves (i.e., does not distort) the shapes of features, like countries or continents. D. preserves (i.e., does not distort) the area of features, like countries or continents.
Which of the following occurs during Fischer esterification?
A) The -OH from the carboxylic acid and the -H from the -OH of the alcohol are eliminated as water. B) The -OH from the alcohol and the -H from the -OH of the carboxylic acid are eliminated as water. C) Water is eliminated entirely from the carboxylic acid. D) None of the above, the reaction does not produce water.
Photosynthetic autotrophs changed the composition of the atmosphere during the oxygen revolution. Indicate whether the statement is true or false
Which of the following minerals is a native element?
a. pyrite b. diamond c. graphite d. gold