Scientists repeat experimental findings in order to
A) improve upon experimental design.
B) eliminate unseen errors.
C) both A and B
D) neither A nor B
D
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Why do composite volcanoes consist of alternating lava and pyroclastic layers?
A) Composite cones are created by lava composition alternating between basalt and rhyolite. B) Composite cones typically are interlayered with lava flows from nearby shield volcanoes. C) Composite cones are created by a mixture of explosive activity and lava flows. D) The lavas in composite cones are typically rhyolitic in composition.
Given a non-cyclic alkane, a non-cyclic alkene, and a non-cyclic alkyne, each of which contains six carbon atoms, which compound will contain the fewest hydrogen atoms?
A) the alkane B) the alkene C) the alkyne D) It is not possible to tell, without knowing how many double and/or triple bonds are present in the unsaturated compounds.
For which of the following reactions is it important that the species collide with the correct orientation?
A) 2 NO(g) + O2(g) ? 2 NO2(g) B) HCl(g) + H2O(l) ? H3O+(aq) + Cl-(aq) C) both of them D) neither of them
Using Figure 12.11 in your textbook, which option correctly identifies a time that polarity changed from normal to reverse and back?
A) normal to reverse: 3.04 million years ago, reverse to normal: 2.60 million years ago B) normal to reverse: 2.60 million years ago, reverse to normal: 1.79 million years ago C) normal to reverse: 3.33 million years ago, reverse to normal: 3.04 million years ago D) normal to reverse: 1.79 million years ago, reverse to normal: 0.99 million years ago