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How can we classify change?

How can we classify change?. What things changed in Monday’s lab?. Which did not change?. Physical Change. Changes that can be reversed are called Physical Changes

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How can we classify change?

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  1. How can we classify change?

  2. What things changed in Monday’s lab? Which did not change?

  3. Physical Change • Changes that can be reversed are called Physical Changes • Our experiments with mixtures and solutions were all physical changes – we could use the techniques of separation of mixtures to reverse them. • Remember the changes of state: melting, evaporation, freezing, etc? Do you think they are examples of physical change? • YES!

  4. Examples of Physical Change • Evaporation, Condensation, Melting, Freezing, Sublimation, Deposition • Chopping, crushing or breaking something • Bending or reforming stuff • Mixing stuff up • Absorption • What 2 physical changes are represented by this picture?

  5. What about changes that can’t be reversed? • Take 3 minutes to discuss with the student behind or in front of you what are some examples of changes that cannot be reversed. Write down what you come up with. • Let’s share! • Changes that cannot be reversed are called Chemical Change

  6. Chemical Change • Chemical change happens when a new substance is formed during the change. When this happens, the original substances cannot easily gotten back • With the same partner, brainstorm ways in which new substances are formed. You have 3 minutes. • Let’s share!

  7. Examples of Chemical Change

  8. What are the processes behind some of those chemical changes? • Burning • Eating • Breathing (and Photosynthesis) • Rust (oxidation) • Rotting • Also, certain chemicals can react when they combine to make a new substance • For example, acids and bases react to make salt

  9. Bibliography of Images • http://4.bp.blogspot.com/_kC5MT2r5U8s/TIdMBXtBxXI/AAAAAAAAQiw/HP_nuuh0tzs/s1600/GOP+red+kool+aid.jpg • http://t3.gstatic.com/images?q=tbn:ANd9GcQGpDrNQKXPF5e_y6oMi7gNy1BcIEnpUgPYE1BKyaL4UV6vG_o&t=1&usg=__7aMba67ItG7ux-UfxyRRA-6s06w= • http://ic2.pbase.com/o6/49/99249/1/70982707.xwHQllgm.OilonwaterNov30.2.jpg • http://www.pollsb.com/photos/o/38393-crushed_ice.jpg • http://news.pillaicenter.com/wp-content/uploads/2010/07/fire1.jpg • http://www.edb.utexas.edu/petrosino/Legacy_Cycle/mf_jm/Challenge2/images/breathing.gif • http://magickcanoe.com/history/rust-fence-tractor-large.jpg • http://blog.ecosmart.com/wp-content/300px-rotting_fruit.jpg • http://upload.wikimedia.org/wikipedia/commons/0/02/Fried_egg,_sunny_side_up.jpg

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