2. which of the following best defines a scientific theory?
a. a well-established, highly-reliable explanation of a natural event
b. a preliminary guess or idea about an event in nature.
c. a true statement about an event in nature.
d. a well-established principle that does not include an explanation.

answer: at room temperature (roughly 20 degrees c), you can dissolve 203.9 grams (or 200 grams) of sugar in 100 ml of water. as water temperature increases, the amount of sugar that will dissolve increases, up to about 500 grams of sugar in 100 ml water at 100 degrees c.

explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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