Gizmo Warm-up A chemical change. (or chemical reaction) occurs when one

or more substances, called reactants, are transformed into

different substances, or products. In the Chemical Changes

Gizmo, you will look for evidence of chemical changes by

looking at changes you can see, touch, or smell.

To begin, check that Reactant 1 is Sodium and Reactant 2

is Water. Sodium is a metal so soft you can cut it with a knife.

1. Click Play ( ). What do you observe?

2. Do you think a chemical reaction has taken place? Explain.