Physical and Chemical Change

BY: John Carney

These materials are @ 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 are @ 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 are @ 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 are @ 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

Data Sheet

Break into lab partners

Click on materials and directions

Click on Data Sheet once you have checked your materials list

These materials are @ 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 4th slide for clues.

These materials are @ 2012 John Carney, Towson University, all rights reserved

Enrichment Activity

what happened in our experiment?

Lets find out

These materials are @ 2012 John Carney, Towson University, all rights reserved

More Enrichment Activities For more information on Chemical changes vs.

Physical changes check these sites

http://www.learner.org/courses/essential/physicalsci/session4/closer1.html

1. http://www.chemteam.info/Matter/WS-Physical&Chem-Changes.html

2. http://www.quia.com/quiz/303980.html

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 are @ 2012 John Carney, Towson University, all rights

reserved

Teacher Support MaterialsState 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 t

he Curriculum and Instruction

These materials are @ 2012 John Carney, Towson University, all rights reserved

Learning ObjectivesStudents 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 are @ 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 are @ 2012 John Carney, Towson University, all rights reserved

References http://www.youtube.com/watch?v=9hB06gspEXE

http://www.learner.org/courses/essential/physicalsci/session4/closer1.html

http://www.quia.com/quiz/303980.html

http://www.chemteam.info/Matter/WS-Physical&Chem-Changes.html

http://mdk12.org/instruction/curriculum/science/standard4/grade8.html

These materials are @ 2012 John Carney, Towson University, all rights reserved