Four students are carrying out different laboratory procedures.Piroja is mixing baking soda and vinegar to see if it reacts.Jason is heating salt water over a burner until the water evaporates.Kali is putting crushed ice and ice cubes on a table to see which melts first.Francisco is separating iron filings from sand using a magnet.

A chemical change forms one or more new substances. Mixing baking soda and vinegar produces carbon dioxide gas, water, and a dissolved salt, so Piroja is testing a chemical reaction. Evaporating salt water, melting ice, and separating iron from sand are physical changes because they do not create new substances.

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