Activity 2: Chemistry In a Bag
With Chemistry In a Bag, students learn the difference between a physical change and a chemical change and how changes can either be endothermic or exothermic.
Set-up:
Each group of four students will need 1 canister filled with calcium chloride (CaCl2), 1 canister filled with sodium bicarbonate (NaHCO3), 1 dropper of phenol red, a set of measuring spoons, a measuring cup, a portion cup, four pairs of goggles and four sandwich bags. Make sure there are paper towels and trash bags at the ready.
Demo and discussion:
To introduce the idea of physical versus chemical change fill one flask with water and another flask with vinegar. Ask the students if they know which is water and which is vinegar just by their
With Chemistry In a Bag, students learn the difference between a physical change and a chemical change and how changes can either be endothermic or exothermic.
Set-up:
Each group of four students will need 1 canister filled with calcium chloride (CaCl2), 1 canister filled with sodium bicarbonate (NaHCO3), 1 dropper of phenol red, a set of measuring spoons, a measuring cup, a portion cup, four pairs of goggles and four sandwich bags. Make sure there are paper towels and trash bags at the ready.
Demo and discussion:
To introduce the idea of physical versus chemical change fill one flask with water and another flask with vinegar. Ask the students if they know which is water and which is vinegar just by their