The end point of an acid-base titration corresponds to which of the following?
A) The point where equal volumes of acid and base have been used.
B) The point where the acid and base have been added in proper stoichiometric amounts.
C) The point where a pH indicator changes color.
D) none of the above
C
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During an action potential, a neuron's membrane potential
A) increases until it reaches threshold, then spikes. B) decreases as sodium ions flow into the neuron. C) increases until it reaches threshold, then decreases. D) may or may not reach threshold.
A lesson from the Ducktown, Tennessee mining experience is that mineral exploitation can
A. significantly improve the health of local people. B. actually enhance the biotic resources of a region. C. produce great wealth but at great social and environmental cost. D. be done in an environmentally sound way.
Overcoming the friction of distance between two places exemplifies dealing with ________.
A. accessibility B. location C. connectivity D. distance
People with AIDS are more vulnerable to tuberculosis.
Answer the following statement true (T) or false (F)