When considering the effect of a catalyst on a system to which Le Chatelier's Principle can be applied, which of the following is true?
A) Addition of a catalyst has absolutely no effect on the reaction.
B) Addition of a catalyst speeds up the forward reaction.
C) Addition of a catalyst speeds up the reverse reaction.
D) Addition of a catalyst speeds up both the forward and reverse reaction by the same amount.
D
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True or False: There is direct geologic evidence about Earth's earliest crust
Indicate whether this statement is true or false.
Which of the following cannot readily cross the blood-brain barrier?
A) Cl- B) K+ C) Na+ D) all of these
The Great Lakes and the Corn Belt region became known as the "Rust Belt" because
A) Decades after the invention of the automobile, large numbers of auto scrapyards and recyclers appeared around manufacturing cities so the iron and steel could eventually be reused. B) The large number of underground iron deposits that filtered into emerging underground springs gave the rocks of the region a yellowish-orange "rusty" tinge as it oxidized. C) The region used to be the hub of the rail system developed during WWII to move goods across America, but as shipping goods by truck and airplane became more prevalent, the system decayed leaving an iron skeleton of its former glory. D) The decay of the region's cities from deindustrialization, as steel mills and auto manufacturers moved to other parts of the world, and the resulting loss of population, increase in crime and chronic unemployment.
Energy enters a system as sunlight and a producer is able to produce 10 kilograms of tissue. If eaten, the producer would produce about ________ kilogram(s) of consumer tissue that would provide about ________ kilogram(s) of tissue for a secondary consumer.
A. 10; 1 B. 1; 0.1 C. 100; 1 D. 100; 10 E. 10; 0.1