facebook Physical and Chemical Changes | Science Lesson For Kids | Grades 3-5
1%
Processing, please wait...
It was processed successfully!
Reading Material

Read About Chemical and Physical Changes

Download as PDF   Go Back to Lesson
chemical reaction causes a ton of colorful foam to form
DEFINITIONS OF PHYSICAL AND CHEMICAL CHANGES

In a chemical change, a new substance is made, like when you burn a candle. In a physical change, no new substance is made, like when water turns to ice.

To better understand the difference between chemical vs. physical changes….

DEFINITIONS OF PHYSICAL AND CHEMICAL CHANGES. In a chemical change, a new substance is made, like when you burn a candle. In a physical change, no new substance is made, like when water turns to ice. To better understand the difference between chemical vs. physical changes….

LET’S BREAK IT DOWN!

Chemical changes make new substances

large fireball from a chemical reaction demonstration

Anytime a new substance is made, a chemical change takes place. Usually two or more materials are combined and a new substance is formed. A chemical change can produce amazing explosions, like fireworks. Some chemical changes are a little more difficult to spot, like when a nail rusts.

If you notice bubbles being formed, or a change in color or temperature, there is a good chance a chemical change has taken place, but not always. Scientists can determine if a chemical change has occurred by asking this question: Was the substance formed present before? If the answer is no, then it is a chemical change.

Since chemical changes make new substances, most of them cannot easily be undone. For example, when you burn wood, you can't really turn the gases back into a log very easily.