2. What is a chemical change?
A chemical change is a change in which one or more new
types of matter form.
In a chemical change materials react with each other.
They combine in new ways to form other materials.
3. What is a chemical change?
The ability of a material to react with other materials in a
certain way is a chemical property.
You cannot observe a chemical property of a material
without changing it into something different.
4. What is a chemical change?
One chemical property is the ability to burn.
When a material burns it reacts quickly with oxygen in the
air.
Heat and light are given off.
5. What is a chemical change?
Another chemical property is the ability to rust.
Iron forms rust when it reacts with oxygen.
6. What is a chemical change?
When the log burns, materials in the wood combine with
oxygen in the air. They form ash, smoke, and carbon
dioxide.
7. What is a chemical change?
The apple core turns brown when it reacts with oxygen in
the air.
8. What is a chemical change?
Black tarnish forms on the surface of the silver spoon.
The tarnish is a different material from silver.
9. What is a chemical change?
Orange rust forms on metal when it gets wet. Iron in the
metal reacts with oxygen in the water. Rust is not iron or
oxygen. Rust is a new material.
10. The signs of a chemical
change
A change in color is often a sign of a chemical change.
Foods change color when cooked, vegetables and fruits
turn color when they rot, egg whites go from clear to
white as they are cooked.
11. The signs of a chemical
change
Some chemical changes cause gases to be given off.
If you add baking soda to vinegar, the liquid bubbles and
gives off carbon dioxide.
Also, the temperature goes down.
If the temperature of a material changes without the
material being heated or cooled, a chemical change has
taken place.
12. The signs of a chemical
change
Most chemical changes can not be reversed. The ones
that can are extremely difficult to.
