Learning By Accident: Tasting Chemicals

test tube 6188082_mA substitute science teacher was conducting a common introductory lab in the grade nine applied chemistry strand, identifying unknown chemicals (salt, baking soda, chalk, sodium nitrate, and sodium thiosulphate) in numbered containers using physical properties. Prior to the activity the teacher was very careful to go over all the safe ways to observe a chemical such as, don’t touch with your hands, don’t smell, and don’t taste She even commented that two of the chemicals were toxic.

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