Materials:Twist, ice cubes, salt, plastic plates, stopwatch or timer
Explain to students they will investigate how salt affects ice
Use Twist to show students a view of an ice cube's surface and salt crystals.
Place two ice cubes on a plate. Ask students to predict what will happen when salt is placed on one of the ice cubes and write predictions on the attached sheet.
Sprinkle some salt on one ice cube. Place Twist above the salted ice cube and have students observe for one minute. Take snapshots of both ice cubes and label them salted 1 minute and unsalted 1 minute. Show students the pictures and have students discuss and write what they see.
Repeat the process of sprinkling salt on one ice cube. Have students use Twist to collect pictures of both ice cubes after four and eight minutes have passed. Have students record predictions and observations about what the ice cubes look like at each interval. Students generate conclusions about the effects of salt on ice after eight minutes.
Show the Twist snapshots taken at different intervals to students and have them place the pictures in sequential order. Ask them to justify their ordering based on details from the pictures. Students present their findings to the class.
Have students add the variables of heat and water to the experiment to determine if blowing on ice or placing warm water on ice will have the same effect as the salt.