When two materials meet, how can you tell whether something new was made?

Combine, then checkPress step 1 to drop the first materials on the bench.Bench log1. liquid water2. salt water3. sawdust4. carbon dioxide gas5. rust6. brown banana7. bread
changes checked
0 of 7
physical changes
0
chemical changes
0
this result
-
evidence
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Press the steps in order, or press Auto. Each step combines starting materials, then checks the result. Same stuff in a new form is a physical change. A new substance is a chemical change.

Changes and verdicts from Introductory Chemistry (CK-12) sections 2.6, 2.14 and 2.18 and the UC Davis Vinegar Cannon demonstration on Chemistry LibreTexts, Chemistry 2e (OpenStax) section 1.3, and NASA Glenn Research Center, Phases of Matter. Our own drawing.