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).
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. 
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
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