F4 Plastic Bottle Cannons

(The following discrepant event appears as MYP4 task as well.)

This is a simple deductive reasoning exercise involving a chemical reaction.

The video below demonstrates an explosive reaction between two gaseous elements. Mixtures of the two gases are contained in different plastic bottle with a rubber bung at the mouth. The reaction is initiated by introducing a lit match next to a small hole on the side of the bottle covered with a small cello (scotch) tape. Watch the video to see and hear the results.

Here is the question:

  1. The two gases in the plastic bottles are colorless and odorless. Deduce the identities of the the two gases. (All you are being asked to do is use your knowledge of the periodic table and some basic properties about the elements on it.)

Concept involved:

  • periodic table, reactive gases, physical properties, color, odor.

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