Predict the number of signals expected in the proton spin decoupled ¹³C spectrum of 3-hexanone, CH₃CH₂COCH₂CH₂CH₃.

Draw the structure of cis-1,3-dichlorocyclopentane.

Which isotope of neon is the major one?

A) 20
B) 21
C) 22
D) 23

Atoms of Ca contain how many protons?

A) 19
B) 40
C) 20
D) 41

Why can't a chemical equation be balanced by changing the subscripts of the reactants and/or products?

A) Because there will always be more reactants than products when using such a method.
B) Because changing the subscripts means changing the identity of the chemicals.
C) It just can't!
D) None of the above; it can be balanced in this manner.