The balanced equation for burning octane is: 2 C8H18(g) + 25 O2(g) ? 18 H2O(g) + 16 CO2(g) What weight of H2O is produced by completely burning 19.8 g of octane?
A) 28.1 g
B) 34.7
C) 69.5
D) 139 g
A
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Why is climate change affecting polar bears in a disproportionate way?
A. It is melting their habitat. B. The high temperature is making them sweat to death. C. The seals they hunt for food are migrating south. D. They are unable to adapt to coastal flooding.
Moist air blows across warm water to colder areas inland. What might this produce?
A) decreased inland temperatures B) a cold air front C) a temperature inversion D) fog
The most important element in Eratosthenes' calculation of Earth's size was that the angle measurements of the Sun's rays with the pillar and reflection of sunlight in the well be
A. the same rays of the Sun. B. exact. C. simultaneous. D. tested by other observers.
The main difference between languages in the same family, branch, or group is how
A) recently in time the languages were once the same. B) closely the speakers of each language live to one other. C) they correspond to the diffusion of free markets across much of the world. D) similar the cultures of the speakers of each language are. E) they all emerged at the same point in history, according to the Bible.