Physical and Chemical Change BY: John Carney These materials 2012 John Carney, Towson University, all rights reserved

The Question That greenish hue tarnish (oxidation) on a penny, have you ever wondered how does a shiny new penny change into a oxidized one? These materials 2012 John Carney, Towson University, all rights reserved

A Penny for your thoughts….  Now lets look at a regular penny. We are all familiar with them, they are coins that can be used in exchange for goods and services. Often penny's are used to make change and are made of copper.  Back to the Green stuff: Oxidation is a chemical process that occurs when oxygen encounters various materials. (copper penny)  The average life span of a penny is 25 years. Thats a lot of wear and Tear! These materials 2012 John Carney, Towson University, all rights reserved

Information..  Earlier this year we spoke about physical and chemical change and how we can tell the difference between the two. For example ice melting, when ice is in its solid state and changes to liquid state it is still water. This is an example of a physical change. An example of a chemical change would be wood burning and turning into ash. Once the wood has been burned it cannot be turned back in to wood so it is a chemical change.  Today everyone will have a chance to conduct their own experiment where in they will determine if the change they witness in the experiment is a physical or chemical change  On the next slide you will be given a set of instructions on how to complete your very own experiment These materials 2012 John Carney, Towson University, all rights reserved

Student Activity  Using your prior knowledge I would like for our class to examine old tarnished pennies, and make educated guesses on the changes you witness  Materials And Directions Materials And Directions  Data Sheet Data Sheet Break into lab partners Click on materials and directions Click on Data Sheet once you have checked your materials list These materials 2012 John Carney, Towson University, all rights reserved

The Assessment Activity  After you completed your Venn diagram part of the clean penny data sheet move on to the written part of the sheet.  Your lab partner and you should discuss the physical properties of the penny before and after the change. Provide evidence that a chemical change took place. **Hint check 4 th slide for clues. These materials 2012 John Carney, Towson University, all rights reserved

Enrichment Activity what happened in our experiment? Lets find out These materials 2012 John Carney, Towson University, all rights reserved

More Enrichment Activities  For more information on Chemical changes vs. Physical changes check these sites  i/session4/closer1.html i/session4/closer1.html 1. Physical&Chem-Changes.htmlhttp:// Physical&Chem-Changes.html 2.  Choose one of the above links and answer the questions. If you choose link 1 print the quiz and answer questions. If you choose link 2 print at the end of the quiz. Turn in all quizzes. These materials 2012 John Carney, Towson University, all rights reserved

Teacher Support Materials  State Standards  Maryland  Eight grade Chemistry  Standard 4.0 Chemistry  Topic D Indicator  Core Learning goals  Goal 4 Concepts of Chemistry 4.4 and 4.5  Maryland Teacher Technology Standards and Performance Indicators  Standard V: Integrating Technology into the Curriculum and Instruction Standard V: Integrating Technology into the Curriculum and Instruction These materials 2012 John Carney, Towson University, all rights reserved

Learning Objectives  Students will identify physical and chemical properties. Students will be able to differentiate between a physical change and a chemical change after performing the experiment. These materials 2012 John Carney, Towson University, all rights reserved

Materials  Laptop  Internet access  ¼ cup of Ketchup in a small bowl  ¼ cup of tomato paste in a small bowl  ¼ cup of Soy sauce  3 petri dishes (Labeled ketchup, Soy sauce, and Tomato paste)  Penny Data Sheet  List of ingredients in each condiment  Pencil or pen  3 oxidized (dirty pennies)  3 sheets of paper towels  Tape (to label petri dishes)  1 plastic spoon These materials 2012 John Carney, Towson University, all rights reserved

References   closer1.html closer1.html   Changes.html Changes.html  ade8.html ade8.html These materials 2012 John Carney, Towson University, all rights reserved