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Answer:
The change that took place is a chemical change as a chemical reaction occurs.
Vinegar = 
Baking soda = 
Reaction:

Great question! An element is one specific symbol. For example, Mg would be an element, N would be an element, and O would be an element. A compound is several elements that come together. Since Mg(NO3)2 is made of three separate elements (Mg, N, and O), Mg(NO3)2 is a compound.