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
What are Molecules?
More than one atom combined to form a substance (e.g., oxygen – O2).
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.
In the Steel Wool Expt, how do you know a chemical reaction has taken place?
By testing the properties before and after the reaction.
Give an Example of a Chemical Change
Steel wool burning, which causes the iron to combine with oxygen and form iron oxide.
Name Properties you can test before and after a reaction
Magnetism, flammability, electricity, density, and odor
What are Atoms?
The smallest particle of matter made up of protons, neutrons, and electrons.
How do you know a Chemical reaction has happened?
If a new substance is formed, it has different properties.