A(n) ____ is a combination of two or more atoms of the same or different elements held together by chemical bonds.
A. nucleus
B. molecule
C. isotope
D. lipid
E. cell
Answer: B
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Dinosaurs went extinct approximately 65 million years ago
Indicate whether the statement is true or false
Acid mine drainage results from the oxidation and dissolution of coal and ________ ores
Fill in the blank(s) with correct word
Many aquifers, including the Ogallala aquifer, are nonrenewable on a human timescale. Should removal of this water be treated in the same fashion as mining other resources? What steps should be taken to control the removal of a nonrenewable resource such as this?
What will be an ideal response?
A catalyst speeds up a chemical reaction as a result of which of the following?
A) It provides an alternate pathway with a lower activation energy. B) It increases the number of collisions between reacting molecules. C) It makes the reaction more endothermic. D) It makes the reaction more exothermic.