PS.8.1.4: Construct an explanation to classify changes in matter as physical…

Kitchen Chemistry Grades 7–8

Fizzing, curdling and colour changes with things from the grocery store. Students gather evidence of new substances, weigh a reaction in a sealed bottle, and turn red cabbage into an acid detector.

• Is it a new substance? 50–60 min

  Teams run six quick kitchen changes, from dissolving sugar to curdling milk, and record properties before and after. They sort each change as physical or chemical using evidence, and find out why a single clue like bubbles or a colour change isn't proof on its own.

• Can red cabbage tell acid from base? 50–60 min

  Students add purple cabbage juice to safe household liquids and watch it turn pink, purple, blue or green. They build a colour scale, sort the liquids into acids and bases, identify two mystery liquids, and watch an acid and a base cancel each other out.

Printable practice for PS.8.1.4

• Kitchen Chemistry workbook included with the unit

  3 practice pages, 3 readings, 2 English-support pages, 1 word wall, 1 unit review, 1 unit test, with answer keys.

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