physical and chemical properties of matter

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Physical and Chemical Properties of Matter. Tuesday 1/7/14. Please take out your lab book Pencil Warm up: in your lab book answer the following questions: What is a physical property of matter? Give 4 examples of a physical property What do you think a chemical property of matter would be?. - PowerPoint PPT Presentation

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Physical and Chemical Properties of MatterTuesday 1/7/14Please take out your lab bookPencilWarm up: in your lab book answer the following questions:What is a physical property of matter?Give 4 examples of a physical propertyWhat do you think a chemical property of matter would be?So What is a Chemical Property?A Chemical property is a characteristic of a substance that can only be observed by changing it into a different substance.

3Chemical PropertiesExamples of chemical properties include:The ability to burnAbility to tarnishAbility to rustAbility to decomposeAbility to react with other chemicalsInstabilityAbility to do acid/base reactions

Determine if the following is Chemical or a Physical.Glass BreakingRusting BicycleBoiling WaterSpoiling FoodMixing Lemonade Powder in WaterCorroding MetalBleaching Your HairFireworks ExplodingSqueezing Oranges of Make OJFrying an EggMelting Wax

Physical and Chemical Changes

Physical ChangeA Physical change is a change in a substance that does not change what the substance is.

Physical Change - examplesExamples of Physical Change include:Change in shapeChange in sizeChange in phaseMelting (solid to liquid)Boiling (liquid to gas)Evaporation (liquid to gas)Condensation (gas to liquid)Freezing (liquid to solid)Sublimation (solid to gas)Deposition (gas to solid)

Physical ChangePhysical changes might be caused by:GrindingCuttingCrushingBendingBreakingHeating/cooling(change in phase)Squishing

Physical ChangeEvidence that a physical change has occurred might include:Change in shapeChange in formChange in sizeChange in phase (This is always a physical change!)Physical changes are usually reversible

Physical ChangeWhat could you do to these items to cause a physical change to occur?

Chemical ChangeA chemical change is a change in which a substance is changed into a different substance. (Youve changed what it is.)

Chemical ChangeExamples of chemical changes include:BurningRustingTarnishingDecomposingPolymerization

Chemical ChangeChemical changes occur when a Chemical Reaction causes bonds between atoms to break or to form.

Chemical Change: EvidenceEvidence that a Chemical Change has occurred might include:A color changeAn odor changeFormation of a precipitate (you mix two liquids and make a solid)Gas is formed (bubbles)Changes in physical properties.

Chemical ChangeDuring a chemical change energy can be released in the form of:HeatLight

Chemical Change - HeatA chemical reaction that releases energy in the form of heat is called exothermic.Heat comes OUTExo = outThermic = heatIt will feel HOT!!!

Chemical Change - HeatA chemical reaction that absorbs energy in the form of heat is called endothermic.Heat goes INEndo = inThermic = heatIt will feel COLD!!

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