They'd observe any new substances or new color, and temp. that is irreversible.
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The answer would be 5.5g because you have to subtract 8.2 minus 2.7 and you get 5.5g so basically the answer is C.
When there is change of state solid to liquid to gas or in any order then there will be change in intermolecular bonds. amount of intermolecular bonds.
b is fastest, having the lowest activation energy (35 kJ) and is an exothermic reaction, releasing energy in the form of heat
c is slowest, having the highest activation energy (55 kJ) and is an endothermic reaction, taking in energy from its surroundings
The deeper you dig into soil, the wetter it is.