Here we show you some real world chemistry problems:

Smoke Taint – contamination of food products by smoke from local sources such as bonfires.

Fuel Contamination – handling errors leading to a mix of fuel types. Analysis / profiling can indicate treatment advice.

Oil Characterisation –

Bleach strength – is that bleach really as strong as has been claimed ?

Packaging contamination – sea water is a common issue where packaging has been on board a ship. Other contaminants can be looked for.