Students recognize that a particular color change is a characteristic property of a substance and that a color change can also be used as evidence that a chemical reaction has occurred ... the ...

Chemical reactions make new chemicals. Atoms are rearranged during a chemical reaction, but the number of atoms does not change. A catalyst is a substance that speeds up a chemical reaction.

Students will be able to explain that mixing substances can cause a chemical reaction that results in ... to gather around the demonstration table to view the reaction. Alternatively, for large class ...