A typical sample of brass is 67% (w/w) copper and 33% (w/w) zinc. How many moles of zinc are dissolved in 67 grams of copper?
A) 0.33 mol
B) 0.50 mol
C) 0.67 mol
D) 1.0 mol
B
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A person born in Nigeria is expected to live a certain number of years based on current mortality levels in that country. This is referred to as:
A) life expectancy at birth B) crude birth rate C) mortality rate D) fertility rate E) none of the answer choices are correct.
Lithification is a pressure-induced process
a. True b. False
Which element would be surprisingly considered a trace element in the ocean despite its abundance in the atmosphere?
A) Sodium B) Calcium C) Chloride D) Nitrogen
If rivers were catching fire in 2015, what group would most likely be involved to investigate the situation and apply federal laws?
A) Environmental Defense Fund B) Natural Resources Defense Council C) Union of Concerned Scientists D) Environmental Protection Agency