As opposed to the first five Dibros, which provide reasons (e.g., in #5, "... in order that your days be lengthened..."), why are the last five Dibros terse commands without reasons? For example, let the Torah explain, 'Do not kill - because Man was made in the image of G-d!' (as in Bereishis 9:6) ?

Why does the Torah state the due punishments and rewards for the first five Dibros, but not for the last five? What Divine punishments will violation of these last five Dibros incur?

Why is Hashem's Name not written in the last five Dibros?

Why is there a 'Kamatz' under "Lo Tirtzach" in the 'Ta'am Elyon' (used for public reading of the Aseres ha'Dibros), but a 'Patach' in the Ta'am Tachton? What does this allude to?