Here are the correct answers for each of your questions:
Question 1
A) Which term describes the conversion of substances into different substances?
Answer: chemical reaction
Question 2
A) Where is energy stored during photosynthesis?
Answer: chemical bonds
Question 3
A) What can be predicted from the valence electrons of the elements in a compound formed by a reaction?
Answer: bond type between the atoms
Question 4
A) Which compound is a carbohydrate?
Answer: C3H6O3
Question 5
A) Why are iron oxides in rocks evidence for prehistoric photosynthesis?
Answer: Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
Feel free to reach out if you have any more questions or need further assistance!