Can all the notes of a chord be played at the same time?

Yes, all the notes of a chord can be played at the same time, which is called playing the chord in "block" form. This typically involves striking all the notes simultaneously on an instrument, such as a piano or guitar. However, in some musical contexts, chords may also be arpeggiated, where the notes are played in succession rather than together. Ultimately, the choice depends on the desired sound and style of the music.