Catalyst. What is happening in these images? Is there a difference?

Catalyst What is happening in these images? Is there a difference?

To Do Now 1. How is the physical property of matter defined. 2. List at least 3 physical properties of matter.

Unit 0: Foundations of Chemistry 2 MATTER & CHANGE 2.4 Physical & Chemical Changes

1 Physical Change Physical Change- change in the physical properties of a substance but not in its chemical composition.

2 Physical Change: Particle Diagram During physical change the substance remains the same before and after the change.

3 Reversible or Irreversible Physical changes may or may not be reversible. Reversible Irreversible

4 Evidence of Physical Changes Bending Breaking Grinding Dissolving Cutting Evaporating Freezing Sanding Mixing Melting

Physical Change: Particle Diagrams + Mixing Substance A Substance B

Physical Change: Particle Diagrams Cutting

Physical Change: Particle Diagrams Solute Dissolving Solvent Solution

5 Chemical Change Chemical Change: changes the composition of the original substance.

6 Chemical Change: Particle Diagram During a chemical change, the original substance changes to new substance(s). Combustion

7 Evidence of Chemical Change Combustion Corrosion (Rust) Digestion Precipitation Fizzing Oxidation Rotting Production of Light, Odor, Heat and Smoke

8 Law of Conservation of Mass In any physical or Chemical change, mass is conserved. Mass is neither created nor destroyed. + Double Displacement +

Physical or Chemical Change? P = Physical Change C = Chemical Change?

Physical or Chemical Change? Ripping a piece of paper in half

Physical or Chemical Change? Flames

Physical or Chemical Change? Water evaporates into steam

Physical or Chemical Change? A bicycle chain rusts

Physical or Chemical Change? Food is digested in the stomach

Physical or Chemical Change? Dye solutions are absorbed by a paper towel

Physical or Chemical Change? A coil of zinc is dropped in a solution of sulfuric acid

Physical or Chemical Change? An apple rots

2.4 Physical & Chemical Changes Notes 1. Physical Change Ø changes the physical properties of a substance but not its chemical composition. Ø the substance remains the same before and after the change. Ø may be reversible. Ø Ex: Bending, breaking, smashing, freezing, melting, evaporating, crushing, cutting, tearing, sanding, grinding, mixing, separating, dissolving. 2. Chemical change Ø changes the chemical composition of the substance. Ø the substance changes to a new substance(s) after the change. Ø is not reversible Ø Ex: Fizzing, burning or combustion, corrosion, production of odor, temperature change, light, rust, precipitation (creation of solids), smoke, decomposition, oxidation, rotting, digestion,

2.5 Physical & Chemical Changes Notes 3. The Law of Conservation of Mass: In any physical or chemical change, mass is conserved because particles are displaced or rearranged, but not created or destroyed.

Exit Ticket 1. Give two examples of the physical properties of water. Why are these physical properties? 2. A mixture of iron and sulfur are separated using magnetism. Another mixture of iron and sulfur are heated to created a new iron-sulfur compound. Which of these is a chemical change? Why? 3. Classify the following as a chemical change or a physical change: a. water boils into steam b. milk turns sour, clumping and smelling rotten c. A metal rusts, changing from silver to brown d. Salt dissolves in water, becoming invisible.