The answer for 15 is oxygen or carbon dioxide they are the same thing!
The answer for 16 is the formula of the compound and the atomic mas of its elements!
This is for if you take connections!
1. C
2. D (I’m not entirely sure)
3.energy can neither be created nor destroyed, only change forms.
4. C
5. A
6. C
I’ve researched and tried to answer these questions correctly.
Answer:
D. Element.
Explanation:
Atoms form elements. Elements form molecules. Molecules form compounds.