Properties of Matter Physical & Chemical Changes

Physical Properties Physical properties are observable Physical properties do NOT CHANGE THE TYPE OF MATTER Nothing new or different is formed Examples are: –Mass –Volume –Density –Color –Shape –Melting point –Boiling point –Freezing Point –Hardness –Ability to conduct electricity –Change in Physical State – solid, liquid, or gas size

Physical Properties Help ID Substances! A physical property can be used to identify a substance – shape, color, odor, texture Example: What is… –Round –Orange –Smells rubbery –Bounces –A Basketball!! Examples of Physical Changes –Boiling –Freezing –Dissolving –Breaking –Making a mixture 2 or more types of matter (substances) mixed together –Does not have to be in specific amounts –Can be separated physically

Chemical Properties Chemical properties are related to the elements that make up a substance. They are not as easy to observe a physical properties Examples: –Flammability –Reactivity

Physical vs. Chemical Properties Physical properties are readily observable Chemical properties can only be observed as the object is changing Example – you do not know if an object is flammable until you set it on fire!

Physical vs. Chemical Properties Baking Soda White PowderReacts with vinegar Rubbing Alcohol Clear liquidFlammable Red Food Coloring Red ColorReacts with bleach to lose its Color Iron Malleable (impressionable) Reacts with Oxygen Physical PropertiesChemical Properties

Changes of Matter Physical Change –Affects one or more physical property, but does NOT change the identity of the substance –Break a piece of chalk – it is still chalk! Chemical Change –The substance changes into an entirely new substance with different properties –Not reversible (except by another chemical reaction) –Bake a cake – the cake is entirely different from the batter – new properties!

Physical or Chemical Change? Cutting Your Hair Rusting Boiling Water Dissolving Salt in Water Burning Wood Frying an Egg

Physical or Chemical Change? EXIT TICKET Cutting Your Hair Rusting Boiling Water Dissolving Salt in Water Burning Wood Frying an Egg Physical Chemical