How many electrons can be accommodated in the fourth shell of an atom?
A) 2
B) 8
C) 18
D) 32
D
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When coal or oil are burned, some part of it is completely combusted, forming CO2; another part is partially combusted, forming CO (carbon monoxide); and some remains unburned and is released as soot
Along with sulfur dioxide, these are the main components of ________. A) ozone B) CFCs C) particulates D) industrial smog E) photochemical smog
Asteroid 2004 MN4 (Asteroid Apophis) was expected to pass very close to Earth on Friday, April 13, 2029, with collision odds initially calculated as 1 chance in 37. NASA’s further calculations now suggest that odds of a 2029 Earth impact are about how much?
a. ?one in 1,000 b. ?one in 10,000 c. ?one in 50,000 d. ?one in 100,000 e. ?one in one million
When a message molecule binds to a receptor,
A. the cell begins to grow and divide. B. the target cell passes the message molecule to another target cell. C. a series of chemical reactions begins. D. the message molecule enters the target cell.
Which of the following weathering processes results in the reddish orange coating on rocks, in soils, and on metal (rust)?
A. salt crystallization B. differential weathering C. oxidation D. freeze thaw