2NGSS Florida Standard SC912P8.2 Differentiate between physical and chemical properties and physical and chemical changes of matter
3What 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
4Measurable properties StrengthHardnessMagnetismAbility to conduct heatAbility to conduct electricity
5Which Physical Properties Depend on Amount MassVolumeArea
6Which Physical Properties Do Not Depend on Amount State of matterMelting pointBoiling pointDensity
7About Melting Point and Boiling Point State = the physical form of a substanceMelting Point = temperature at which a substance changes from a solid to a liquidBoiling Point = temperature at which a substance changes from a liquid to a gas
8Density The amount of matter in a certain volume of a substance Density = mass/volumeOn your whiteboard, calculate the density for a 10.0cm3 of ice that has a mass of 9.17kg.
9How 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/cm3 and a volume of 6.7 cm3, what is the mass of the metal?
10Density vs. WeightWeight = exertion of gravity upon matter; linear measurementDensity = concentration of mass in a given volume; derived measurement
11What Are Chemical Properties? Chemical property = how a substance changes into a new substanceNot as easy to observe as physical propertiesSubstances combine or break apart
12Examples of Chemical Properties Flammability = the ability to burnNonflammability = the inability to burnReactivity = ability of a substance to react with another substance
13More About Reactivity Reactive elements are usually found as compounds Less-reactive elements are more likely to be uncombined.
14Which type property is it? Material or objectObservationPhysical or chemical property?ChalkForms bubbles when put into vinegarIce creamMelts in the sunTinBend easilyPaperBurns quicklyLiquid waterEvaporatesCar doorStarts to rustHelium balloonFloats in air