Question

which is an example of a chemical change? a) grill marks forming on a hamburger being barbequed b) the formation of clouds c) grinding medication into a fine powder d) extracting iron fillings from a mixture using a magnet

Explanation:

A chemical change results in the formation of new substances. Grill - marks on a hamburger are due to the Maillard reaction, a chemical reaction between amino - acids and reducing sugars that forms new compounds. Cloud formation is a physical change (phase change of water). Grinding medication is a physical change (change in particle size). Extracting iron filings with a magnet is a physical separation method.

Answer:

A. grill marks forming on a hamburger being barbequed