Question

Which is an example of a chemical change?

A. heating a block of ice to form liquid water
B. heating a tungsten wire until it glows brightly
C. adding sugar crystals to water to form a clear, colorless liquid
D. passing an electric current through water to form hydrogen and oxygen

Answer 1

D. passing an electric current through water to form hydrogen and oxygen

Step-by-step explanation:

only one that's not just a physical change.