Mary melts a 1 pound chocolate bar and 1 pound of chocolate chips in two pots. Which melts last?
bar chips
A B
It would be hard to get a big chunk of chocolate to dissolve in your milk or hot water. Maybe you could make hot chocolate from some smaller pieces like chocolate chips, but it is much easier to add a powder to your milk. This is because the smaller the pieces are, the more surface area they have.
surface area
smaller
more
LESS
LESS
pieces
last
bar
melts