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Chemistry Physical Properties • I can describe this car by: – – – – – Red and black Smooth texture Mass of 28 g Wheels are circular 89 cm3 Physical Properties • The characteristics of a substance that can be observed without changing the identity of the substance. – – – – – – – Color Shape Size Texture Volume Mass Density Let’s Review Density • If animal has a mass of 75 grams and has a volume of 25 cm3. What is animal’s density? • 75g/25cm3 = 3 g/cm3. Physical Properties Physical Change • A physical change is a change in a substance that does not change the substance into a different one. Physical Change How do I make a physical change? Chemical Properties • Describe how substances can form new substances. – Ability for wood to burn – Ability for metal to rust – Ability for material to explode Chemical Changes • The change of one substance into another substance. – Production of odor – Change in temperature – Change in color – Formation of bubbles – Formation of a solid How can I make the wood have a chemical change? What can be done with the pizza to have a chemical change? How can you tell a chemical change has taken place? Is it Physical or Chemical? Is it physical or chemical? Is it physical or chemical?