a group of students are wandering around a room. when their teacher claps, the students sit down wherever they are.
this situation best models the formation of which type of solid?
1) an amorphous solid because the particles do not have a regular structure
2) an amorphous solid because the motion of the particles stopped
3) a crystalline solid because the moving particles lock into fixed positions
4) a crystalline solid because the particles have a long-range order
Answers: 2
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Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves
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What is the density, d, of a substance with a volume of v = 12.5 cm3 and a mass of m = 74.4 g ?
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4al + 3o2 → 2al2o3 what does the "3" in front of o2 stand for? a) it indicates that there are 5 oxygen atoms after you add the coefficient and the subscript. b) it indicates that that there are are total of 6 oxygen atoms all bonded together as a single molecule. c) it indicates that there are 3 oxygen molecules chemically bonded to each other in the reaction. d) it indicates that there are 3 separate oxygen molecules in the reaction.
Answers: 2
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