How is Physical Change different from Chemical Change?
In a physical change, no new substances are formed. In a chemical change, new substances are formed.
How do you know a Chemical reaction has happened?
If a new substance is formed, it has different properties.
Give an Example of a Chemical Change
Steel wool burning, which causes the iron to combine with oxygen and form iron oxide.
In the Steel Wool Expt, how do you know a chemical reaction has taken place?
By testing the properties before and after the reaction.
What are Atoms?
The smallest particle of matter made up of protons, neutrons, and electrons.
What are Molecules?
More than one atom combined to form a substance (e.g., oxygen – O2).
Name Properties you can test before and after a reaction
Magnetism, flammability, electricity, density, and odor
What are Reactants and Products?
Substances that are combined to form products in a chemical reaction is Reactant.The result of substances being combined is a Product
What does a Catalyst do in a Chemical Reaction?
A catalyst helps the chemical reaction happen faster, but it does not become a part of the new substance.
What happens to Atoms in a Reaction? Do some Disappear?
They are Rearranged
