Signs of a Chemical Change

Use the standard's five signs: color, gas, temperature change, odor, and a new substance.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 50

Some changes do more than change form. A chemical change makes a new substance.
Scientists look for five signs: a color change, gas, a temperature change, an odor, and a new substance.
An iron nail left in the rain turns to reddish-brown rust. That color is a sign of a new substance.
Try it with a grown-up: pour vinegar on baking soda in a cup, and watch the bubbles. Use only kitchen materials, and never mix household cleaners.

Georgia Standards of Excellence in Science:

S5P1.c — Plan and carry out an investigation to determine if a chemical change occurred based on observable evidence (color, gas, temperature change, odor, new substance produced).