Question

A teacher mixed iron filings with sulphur on a metal tray. She heated the mixture in a fume cupboard. Sulphur is yellow. Iron filings are grey. The mixture glowed very brightly. The teacher turned off the bunsen burner. The glow spread through the mixture. When the mixture cooled, a black solid called iron sulphide was left. From this information, give one way you can tell that a chemical reaction took place.

Answer 1

Answer:

"formation of new substance"

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Answer 2

Answer:

it glowed that is the chem reaction

Explanation: