In Scrabble, if you are able to use all your letters to make a word, do you get any extra points?
Yes, assuming you have a full hand of seven tiles. From the rules:
BINGO! If you play seven tiles on a turn, it's a Bingo. You score a premium of 50 points after totaling your score for the turn.
If you have fewer than 7 tiles at the end of the game, playing them all doesn't get you this bonus.