A chemical change occurs when a new substance is formed. Physical change is not a permanent change. You can easily get the material that you started with.
Signs of Chemical Change:
- Gas has been given off.
- There is a colour change.
- There is a different smell.
- There is heat given out or absorbed.
- The change cannot easily reverse.
Signs of Physical Change:
- The substance changes state.
- The change can easily be reversed.
- No new substance is formed.
- The mass of the object is the same at the end of the change.
Atoms
Atoms are the smallest particle of a chemical element that can exist. Everything is made of atoms. Atoms are made up of 3 main types of particles: Electrons, Protons, and Neutrons.
Electrons are the tiny particles that have a negative electrical charge.
Protons are much larger and heavier than electrons and have the opposite charge. They have a positive charge.
Neutrons are large and have a similar mass to protons. Neutrons have no electrical charge.
Elements
Scientist have found more than 100 different types of atoms. A substance made of only one type of atom is called an element. Scientist have arranged all the known elements into a table called "The Periodic Table of Elements.
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