NGSS Florida Standard SC912P8.2 Differentiate between physical and chemical properties and physical and chemical changes of matter
What are Physical Properties? Physical property = characteristic that can be observed without changing the identity of the substance. Properties of an object are determined by the properties of the materials the object is made of
Measurable properties Strength Hardness Magnetism Ability to conduct heat Ability to conduct electricity
Which Physical Properties Depend on Amount Mass Volume Area
Which Physical Properties Do Not Depend on Amount State of matter Melting point Boiling point Density
About Melting Point and Boiling Point State = the physical form of a substance Melting Point = temperature at which a substance changes from a solid to a liquid Boiling Point = temperature at which a substance changes from a liquid to a gas
Density The amount of matter in a certain volume of a substance Density = mass/volume On your whiteboard, calculate the density for a 10.0cm 3 of ice that has a mass of 9.17kg.
How would you answer? What determines the properties of an object? What are two physical properties of an object that depend on the amount of material you have? What is a state? What is the density of 10kg mass of water? How would you rearrange the density equation to show how to find the mass of a substance if you know the volume and density? If a piece of metal has a density of 11.3g/cm 3 and a volume of 6.7 cm 3, what is the mass of the metal?
Density vs. Weight Weight = exertion of gravity upon matter; linear measurement Density = concentration of mass in a given volume; derived measurement
What Are Chemical Properties? Chemical property = how a substance changes into a new substance Not as easy to observe as physical properties Substances combine or break apart
Examples of Chemical Properties Flammability = the ability to burn Nonflammability = the inability to burn Reactivity = ability of a substance to react with another substance
More About Reactivity Reactive elements are usually found as compounds Less-reactive elements are more likely to be uncombined.
Which type property is it? Material or objectObservationPhysical or chemical property? ChalkForms bubbles when put into vinegar Ice creamMelts in the sun TinBend easily PaperBurns quickly Liquid waterEvaporates Car doorStarts to rust Helium balloonFloats in air