Our Precious Air! Miss Laverty 2012 *** Experiments, lesson and work sheet adapted from the Edmonton Public curriculum book***

February 29th If you are one of the first few people, please hand out the work books Grab today’s worksheet from the blue handout bin Sit down and show me you are ready to do a “SODA SPRAY”

Diet Coke & Mentos Mythbusters explanation: http://www.youtube.com/watch?v=LjbJELjLgZg

Soda Spray Materials: 2L bottle of Diet Coke, 2 Mentos candies Procedure: Do this experiment somewhere where it is ok to make a mess (outside) Open the bottle of pop Quickly put 2 Mentos candies in the bottle Observe and record results

Soda Spray Results: the diet coke erupted out of the bottle when the candies were added

Soda Spray Inferences: Soda pop has carbon dioxide molecules in it Mentos have lots of tiny craters on the surface When the carbon dioxide molecules attach to the candy they turn into carbon dioxide gas, which escapes out of the bottle Carbon dioxide is just one of the gases that make up air

Gone to Rust Steel wool in the tube for one day Before and after diagrams Observations The steel wool developed rust and the water level rose in the beaker

Gone to Rust

Gone to Rust Inferences: Rusting uses oxygen Once all of the oxygen is used up, no more rusting will occur

Our Precious AIR! Air is made up of a mixture of gases. Nitrogen represents 78 %, oxygen makes up 21% and argon, carbon dioxide and other trace gases make up 1% together. Represent these numbers in a pie chart and bar graph.

Air

Do sections: 1, 2 and 8! Title Pages Use the rubric to get the best mark possible Include diagrams, labels and descriptions Do you best work No errors Colour Do sections: 1, 2 and 8!

Tomorrow Review game tomorrow Test on FRIDAY! Take you work book home to study if you would like You will be tested on every thing we have done since February 14th (Air and Aerodynamics)