Learning+Task+3

=Learning Task 3 - Egg density lab=



= = =__Procedures:__=

=Present students with the following ‘useless trivia question’: If you have eggs in the fridge and you are wondering if they are still fresh, what can you do?=

=//Answer//: You can set the eggs in a jar full of water. Those that float are ‘expired’ and those that sink are still fresh.=

=The science behind this: Eggs that are old begin to decompose, or ‘gas up’. As the level of gas increases, they are less dense, and will no longer rest on the bottom of the jar. Instead, they will begin to float or partially float.=

=1) Keeping the trivia question in mind, conduct the following experiment:= =a) Fill a beaker 2/3 full with water= =b) Ask students, “What will the egg do in the water, sink or float?”= =c) Put the egg in the beaker of water.= =d) Slowly pour salt into the water and stir carefully.= = = =2) Answer and discuss the questions on the “Egg in Salt Water” worksheet.=

** Discuss discoveries and extend discussion by applying knowledge to the building of boats. **






