Which of the following is true?
A) Decreasing the activation energy decreases the reaction rate.
B) Decreasing the activation energy increases the reaction rate.
C) The activation energy of an exothermic reaction is negative.
D) There is no relationship between activation energy and reaction rate.
B
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Covalent bonds link a water molecule's ________.
A. positively charged oxygen atom and positively charged hydrogen atoms B. negatively charged hydrogen atoms and negatively charged oxygen atom C. positively charged hydrogen atoms and negatively charged oxygen atom D. positively charged oxygen atom and negatively charged hydrogen atoms E. They do not bond atoms.
The eluviation in this Alfisol is most evident at a depth of ________ feet.
A) 0.5
B) 1
C) 2
D) 3
Between 1960 and 2010, the total amount of recycled MSW in the U.S. has
A) actually declined by about 10%, a very disappointing trend. B) stayed about the same, as the cost of natural resources had declined. C) actually doubled, representing significant improvement. D) increased by more than 500%, representing a huge improvement.
Which amino acids are coded for by the most codons?
A) glycine and alanine B) glycine and leucine C) leucine and serine D) leucine and methionine