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Realplayer videos\JCE Software Chemistry Comes Alive!.mov. Chemical Properties. Section 17.3. Demo - Candle. What physical changes can be made to each item? Candle Match Stick Light the match and put it near the side of the candle. Is the melting wax a physical or a chemical change?

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Presentation Transcript
demo candle
Demo - Candle
  • What physical changes can be made to each item?
    • Candle
    • Match
    • Stick
  • Light the match and put it near the side of the candle. Is the melting wax a physical or a chemical change?
  • Light the candle. As the wax and the wick burn, is it a physical or a chemical change?
chemical properties of matter
Chemical Properties of Matter
  • Chemical properties describe a substance’s ability to change into new matter with new properties.

Realplayer videos\Video pedia World - Elements Of Chemistry Chemical Reactions2.flv

  • Flammability: describes whether substances will react in the presence of oxygen and burn when exposed to a flame
chemical properties1

carondelet.net

Chemical Properties
  • Reactivity: describes the ability of two or more substances to combine to form one or more new substances.
    • Rusting – reactivity with oxygen
    • Explosive reaction of elemental sodium with chlorine to form table salt

Realplayer videos\Bill Nye The Science Guy on Chemical Reactions (Full Clip) - Bing Videos.flv

Realplayer videos\Reaction of Sodium Chlorine (with subtitles).flv

www.artmetal.com

chemical property applications
Chemical Property Applications
  • Galvanized steel is steel coated with zinc to prevent rusting (buckets, nails).
  • Steel plated with tin was once used in food cans and containers. Today, aluminum cans have replaced most steel cans.
interesting facts
Interesting Facts
  • Before the early 1960s, there was a group of gases (named noble gases) that were thought to be unreactive. However, in 1962, Dr. Neil Bartlett of Univ. of Brit. Columbia formed a new compound by combining platinum, fluorine, and the noble gas xenon.
  • In 2002, chemists created new compounds by bonding uranium with argon, krypton and xenon (all noble gases).

www2.chemistry.msu.edu

interesting facts1
Interesting Facts
  • Chromium has been used as a coating on car bumpers because it is nonreactive with oxygen (so the bumper is protected from rusting).
  • Rustproofing involves treating the car’s underside and panels with sealants, which penetrate the seams, cracks, and holes to keep out air and moisture – which would increase the rate of rusting.
substance identification
Substance Identification
  • Characteristic properties are used to identify and classify substances. They can include both physical and chemical properties. Examples: density, solubility, flammability, reactivity
  • These properties do not depend upon the size of the sample (so mass, weight and volume would not be characteristic properties).
substance identification1
Substance Identification
  • Example: How can you tell the difference between baking soda and baking powder if they are out of their container?
  • Reactivity with vinegar:
    • Baking soda reacts
    • Baking powder does not

Realplayer videos\SloMo - Baking soda + vinegar reaction @ 420 fps - Bing Videos.flv

chemical changes
Chemical Changes
  • Chemical changes are the processes by which one or more substances are changed into new substances.
indicators of chemical change
Indicators of Chemical Change
  • Change in color or scent

Realplayer videos\Chemical Changes color change.mov

  • Production of a gas – fizzing, foaming, effervescence.

Realplayer videos\Chemical Changes gas production.mov

indicators of chemical change1
Indicators of Chemical Change
  • Production of a solid (precipitate)

Realplayer videos\Precipitate formation Chemistry Comes Alive!.mov

  • Production of heat
  • Production of light or sound

Realplayer videos\Heat released in chemical reactions Chemistry Comes Alive!.mov

  • What indications of chemical change do you see in the next video?

Realplayer videos\Indicators of chemical change.flv

chemical changes1
Chemical Changes
  • Matter’s identity is changed in a chemical reaction.
  • Reversing a chemical reaction (getting back what you started with) is not always possible. If it is possible, it requires more chemical changes to take place.
  • Could you reverse the explosion of fireworks?
physical changes
Physical Changes
  • Since physical changes don’t change the composition of a substance, they are frequently easily reversible.
  • Example: Heating an ice cube to make it melt e cool the resulting liquid to make it freeze
  • Dissolving a solid in a liquid emaking the substance recrystallize from the solution

Realplayer videos\Crystallization of supersaturated sodium thiosulfate - Bing Videos2.flv

references
References:
  • http://www2.chemistry.msu.edu/portraits/PortraitsHH_Detail.asp?HH_LName=BartlettN
  • http://www.kenyacarbazaar.com/blog/?p=899
  • http://carondelet.net/Aspring08/Project2/Caitlin/New%20York%20City.htm
  • http://www.artmetal.com/images/sculpture_gallery/josh/2007/07/rusted_sculptures_update_0
  • http://www.manufactum.com/Artikel/99272/2GalvanizedSteelPlantTub.html
  • http://besbryant.sharpschool.com/cms/One.aspx?portalId=839802&pageId=2630106
  • http://mbt6644.k12.sd.us/frontpage1/project1/inthelab1/pictures.htm
  • http://miamirealestatecafe.com/2009/12/28/cleaning-tips-for-your-miami-home-using-everyday-items
  • http://www.bbc.co.uk/food/baking_powder
  • http://www.etftrends.com/2010/07/price-impact-aluminum-etf/
  • http://www.icollector.com/Lot-Of-7-Tin-Cans-Texaco-Capella-Oil-Tin-Can-Transmi_i8458786
  • http://qwickstep.com/search/chemical-changes-examples.html
  • http://www.chemistryland.com/CHM130W/04-Properties/PropertiesBook/ChangesAssignment.htm
  • http://www.queenmaryschool.net/ScienceFair/?tag=/chemical-change
  • http://picsdigger.com/keyword/chemical%20changes/
  • http://jchemed.chem.wisc.edu/JCESoft/CCA/pirelli/pages/cca1NaIHgCl2.html
  • http://www.treklens.com/gallery/North_America/Canada/photo154072.htm
  • http://micro.magnet.fsu.edu/moviegallery/chemicalcrystals.html