Lab Aids | Store

Conservation of Matter

kit #142

In this activity students investigate the difference between closed and open systems and confirm, the Law of Conservation of Matter. They conduct and compare a chemical reaction taking place in a closed system with one occurring in an open system. They observe that while the mass of a gas-producing reaction decreases in an open system, it remains the same in a closed system. Their data is also used to reinforce the molecular nature of all matter, including gases.



  • Matter is neither created nor destroyed during chemical reactions.
  • Substances react chemically in characteristic ways with other substances to form new substances that have different chemical properties.
  • In reactions, the starting materials-reactants-are chemically altered to form products.

Content List in Conservation of Matter is as follows:

Quantity Description
1 Teacher’s Guide with MSDS
28 Student Worksheets and Guides
12 Reaction bottles with screw-on dropper top
6 30 mL bottles of 4M HCl (half filled)
6 15 g vials of NaHCO3
6 White scoops
Number of students
Number of groups
Maximum 6 groups per period

To complete this kit will require one to two ~55 minute periods.

Title Item # Price Quantity
Conservation of Matter 142 $78.91
ADD A GROUP for Conservation of Matter 142EL $9.95
Conservation of Matter Refill Kit 142-RC $26.95