Complete and balance the equation: Mg + HC2H3O2 ? _____________________
Fill in the blank(s) with correct word
Mg + 2HC2H3O2 ? H2+ Mg(C2H3O2)2
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During heating, an amorphous material starts to soften at the ______________transition temperature.
Fill in the blank(s) with the appropriate word(s).
Sonic Booms: A sonic boom occurs only as an airplane just reaches the speed of sound in air, but not after it increases its speed further.
A. True B. False
A sample of 
has a mass of 50.0 grams. What is number of molecules of carbon dioxide in the 50.0 gram sample? (C = 12.0u, O = 16.0u)
A. 
B. 
C. 
D. 
E. 
According to the Big Bang theory, how many forces—and which ones—operated in the universe during the GUT era?
A) 1 force that represented the unification of all four forces that operate today B) 3 forces: gravity, the strong force, and the electroweak force C) 2 forces: the strong force and the electroweak force D) 2 forces: gravity and a single force that later became the strong, weak, and electromagnetic forces