On the table below, record your observations before and after the interactions and explain how mass was conserved. Describe the
changes in properties that prove a chemical reaction occurred. The first row is an example.
Observations Before
Observations After
How was mass
Proof of a Chemical
Interaction
Interaction
conserved?
Reaction
Example: Sugar +
Heat
The sugar is in tiny white
particles in a pile. Heat is
There is a solid, light brown The mass of the sugar is the
mass at the bottom of the pot. same in melted form as it is
There was not a chemical
not seen but is implied by the It has a mass of 100 grams.
reaction. Sugar did not
heat source. The pile of
in solid crystal form.
change composition. It only
sugar in the in pot has a mass
melted. Melting point is a
of 100 grams.
physical property, and this is
Steel Wool
a physical change.
Oxygen (Fire)
Egg
Heat
Water + Heat
Zinc + Hydrogen
Chloride
Sodium
Hydroxide •
Copper Sulfate?