Using the P/E index, the Thornthwaite system defines ____ major humidity provinces and their characteristic vegetation
a. three
b. four
c. five
d. six
e. seven
ANSWER: c
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What is a functional group?
A. a group of hydrocarbons that can be used to make new materials B. a set of atoms bonded together that give molecules containing them similar properties C. a set of molecules that are grouped together to form a functional material D. a group that adds function E. none of the above
Which of the following statements explains why the presence of Mesosaurus in both South America and Africa supports the continental drift hypothesis?
a. Mesosaurus was a freshwater aquatic reptile and swam from South America to Africa. b. Mesosaurus was a terrestrial reptile that rafted across the ocean from South America to Africa. c. Mesosaurus was a saltwater aquatic reptile and swam from South America to Africa. d. Mesosaurus was a freshwater aquatic reptile with fossil remains in both South America and Africa. e. Mesosaurus was a terrestrial reptile that was able to cross from Africa to South America by an isthmian link.
A single brick and a double brick have equal accelerations when falling in a vacuum because
A. no air resistance acts on them. B. the force of gravity on both is the same. C. they have unequal masses. D. none of the above
How many moles of H2 bonds are broken if you react nitrogen with hydrogen according to the following reaction? N2 + 3H2 ? 2 NH3
A. 2 B. 8 C. 3 D. 1 E. 6