Regents Chemistry Exam August 2025 Question 43 43 Given the formula representing a compound: What is a chemical name for this compound? (1) 1-heptanone (2) 7-heptanol (3) heptanal (4) heptanoic acid Solution: Table R on the reference table lists all the functional groups for organic compounds and their names. The functional group for this molecule is aldehyde. (C=O). The name should end in "al". The only name that end in al is haptanal, Choice 3. LINKS: Regents Chemistry Guid

Regents Chemistry Exam August 2025 Question 42 42 Which equation represents an increase in entropy? (1) CO 2 (g) → CO 2 (s) (2) H 2 O(l) → H 2 O(s) (3) Br 2 (g) → Br 2 (l) (4) I 2 (s) → I 2 (g) Solution: Entropy refers to disorder. Gas(g) is more disordered than liquid(l) which is more disordered than solid(s).Going from solid to gas would results in an increase in entropy. Choice 4 is the correct answer. LINKS: Regents Chemistry Guides and Solutions Chemistry Tutoring More R