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Conservation of Mass Post Lab Discussion

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Page 1: Law of Conservation of Mass  Matter cannot be created nor destroyed during a physical or chemical change.  The sum of the reactants will equal the sum

Conservation of Mass

Post Lab Discussion

Page 2: Law of Conservation of Mass  Matter cannot be created nor destroyed during a physical or chemical change.  The sum of the reactants will equal the sum

Law of Conservation of Mass

Matter cannot be created nor destroyed during a physical or chemical change.

The sum of the reactants will equal the sum of the products after a physical or chemical change.

Reactants Products: Matter is conserved.

Antoine Lavosier

Page 3: Law of Conservation of Mass  Matter cannot be created nor destroyed during a physical or chemical change.  The sum of the reactants will equal the sum

Aluminum and Copper Chloride

2Al + 3CuCl2 3Cu + 2AlCl3

Two Aluminum Two Aluminum

Three Copper Three Copper

Six Chlorine Six Chlorine

Reactants EQUAL Products

Page 4: Law of Conservation of Mass  Matter cannot be created nor destroyed during a physical or chemical change.  The sum of the reactants will equal the sum

Copper Chloride and Sodium Hydrogen Phosphate

3CuCl2 + 2Na3PO4 ---> Cu3(PO4)2 + 6NaCl

3 Copper 3 Copper

6 Chlorine 6 Chlorine

6 Sodium 6 Sodium

2 Phosphorus 2 Phosphorus

8 Oxygen 8 Oxygen

Page 5: Law of Conservation of Mass  Matter cannot be created nor destroyed during a physical or chemical change.  The sum of the reactants will equal the sum

Chemical vs. Physical

Chemical Change: reactants mix together to form a new product with different properties

Gas is formed Rust is formed Precipitate (solid) formed

Physical Change: reactants mix together but product maintains the same properties as the reactants.

Melting Freezing Dissolving

Page 6: Law of Conservation of Mass  Matter cannot be created nor destroyed during a physical or chemical change.  The sum of the reactants will equal the sum

Chemical vs. Physical Which experiments demonstrated a chemical

change?

Which experiments demonstrated a physical change?