Final answer:
A chord's notes are played simultaneously, while an arpeggio's notes are played in sequence, making the statement true.
Step-by-step explanation:
The statement that a chord differs from an arpeggio in that its notes are played simultaneously rather than successively is true. When playing a chord, a musician strikes multiple notes at the same time, thereby producing a harmonious sound that combines the frequencies of each note into one.
In contrast, an arpeggio involves playing the individual notes of a chord sequentially, which means one after the other, allowing each note to be heard distinctly before the next one is played.