When calculated energy transferred between objects use the definition of heat as
Answer:
The "2" tells us that there are 2 hydrogen atoms in this compound.
Explanation:


Compounds contain two or more different elements.
Water is a molecule because it contains molecular bonds . Water is also a compound because it is made from more than one kind of element. (oxygen and hydrogen).
So If you like, you can say that water is a molecular compound.
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