Why does a glowing splint of wood burn only slowly in air, but rapidly in a burst of flames when placed in pure oxygen?
A. Pure oxygen is able to absorb carbon dioxide at a faster rate.
B. Oxygen is a flammable gas.
C. A glowing wood splint is actually extinguished within pure oxygen because there's no room for the smoke to expand.
D. There is a greater number of collisions between the wood and oxygen molecules.
Answer: D
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In which situation would you expect to be closest to peak load?
A) on a windy day B) on a cool, sunny day C) on an extremely hot day D) in the middle of a spring night E) Peak load is always the same, regardless of time or weather.
When a solution of Cu(II) chloride, CuCl2 , is added to a solution of potassium sulfide, K2S, a black precipitate of copper sulfide, CuS, forms. Which of the following is the molecular equation for this reaction?
A) CuCl2(aq) + K2S(aq) ? CuS(s) + 2 KCl(aq) B) Cu2+(aq) + Cl22-(aq) + K22+(aq) + S2-(aq) ? CuS(s) + K22+(aq) + Cl22-(aq) C) Cu2+(aq) + 2 Cl-(aq) + 2 K+(aq) + S2-(aq) ? CuS(s) + 2 K+(aq) + 2 Cl- (aq) D) Cu2+(aq) + S2-(aq) ? CuS(s)
What happens to water velocity downstream? It generally 
A. increases. B. remains the same. C. decreases. D. There is no way to tell because discharge cannot be determined.
How can growing corn in Iowa using industrial agricultural practices contribute to the creation of a dead zone in the Gulf of Mexico? Refer to Figure 4.20.
What will be an ideal response?