How do we account for the great variety of substances in the world?
A) The Earth is 4.5 billion years old.
B) Most of these substances are organic compounds.
C) Atoms are incredibly small.
D) There are many possible combinations of atoms.
Answer: D
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The reason that you would use a ramp to carry a weight to the top of a platform, rather than lifting it up a ladder, is because the
a. force exerted would be less b. work done would be less c. power expended would be less d. gain in potential energy would be more
A(n) _____ is a closed curve around two points called the foci, such that the total distance from one focus to the curve and back to the other focus remains constant
A) ellipse B) equant C) deferent D) paradigm
What is the number of moles of H2O produced if you combust 0.5 mole of CH4 according to the following balanced equation?
CH4 + 2 O2 ? CO2 + 2 H2O A) 2 moles B) 4 moles C) 6 moles D) 8 moles E) 1 mole
Convergent boundaries are regions of
A) great mountain building. B) plate subduction. C) plate collision. D) plate collision, subduction, and mountain building.