What changes and what stays the same when salt dissolves in water?
1. Ask the question
Students will continue to explore very tiny pieces of matter, pieces that can be smaller than most drops of water, and sometimes smaller than grains of sand. The substance they will investigate today is salt. Today's investigation also introduces transformation, or change, something students will continue to study throughout the curriculum, particularly transformations of water.
Today's investigation question is:
What changes and what stays the same when salt dissolves in water?