Forward, I am heavy, but backward, I am not.

What am I?

A ton.

What is always coming, but never arrives?

Tomorrow

Tear one off and scratch my head. What was red is black instead. What am I?

A match.

How many 2 in. long blocks can you put into a 3 liter

empty box?

One; once you put a block into an empty box, it’s no longer empty.

What word in the dictionary is always spelled incorrectly?

Incorrectly