iPad Study of Physical and Chemical Properties and Changes Instructions: 1. Get into a group of 3­4 (no more!) people. 2. Take a large sheet of paper and a pad of sticky notes for each person. Draw a line cross the center of the paper (“hamburger­style”) 3. Take a few moments to think ​
to yourself​
about the kinds of things you can observe when looking at types of matter and how it behaves; such as its size, its color, that fact that it melts when it gets hot, etc. 4. Again without talking, take turns in your group writing a characteristic or property you can observe about matter on a sticky note and put it on the large sheet of paper. Keep going for at least 2 minutes. If someone can’t think of anything, they can pass ­ just keep adding as many NEW thoughts as you can. 5. Now go online and search for a definition for “Physical Property” and “Chemical Property.” As a group decide on the best definition for each and write them in the boxes below. Physical Property: Chemical Property: 6. Look at your sticky notes. Sort them according to whether you think they relate to Physical or Chemical properties. Put the Physical Properties above the line and the Chemical Properties below the line on the sheet of paper. 7. Look at the list below. As a group decide if the following properties are Chemical (C) or Physical (P) properties. Put a C or a P on the line next to the property. _____ blue color
_____ melts at 45 degrees Celsius
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_____ density of 2.8 g/cm​
_____ bubbles when put in water _____ flammable (burns)
_____ hard enough to scratch glass _____ dissolves in water
_____ boils at 140 degrees Celsius _____ fizzes in vinegar
_____ shiny _____ smells like rotten eggs
_____ tastes sour _____ rusts in air
_____ has a mass of 52.8 g 8. Now go to this link http://studyjams.scholastic.com/studyjams/jams/science/matter/changes­of­matter.htm Watch the video on Physical and Chemical Changes in Matter. Once you have watched the video, have your group complete the chart below by checking whether they think the change described is a Physical or Chemical Change. Change Physical Chemical A new substance is formed This type of change can usually be undone It can be a temporary change The composition of the substance changes The substance is still the same The change is usually irreversible Light or heat is given off during the change The matter changes size or shape It is a permanent change This change happens when a solid becomes a liquid or a gas There is a sudden color change There is a noticeable increase in temperature 9. Go to the following websites and find information that will let you check your group’s answers in the chart above. Make any corrections that you need to. These websites will help you learn about chemical and physical changes. Visit these websites in this order. 1. Physical and Chemical Changes at http://nobel.scas.bcit.ca/chem0010/unit2/2.3_changes.htm# 2. A Closer Look: Chemical vs. Physical Change at http://www.learner.org/courses/essential/physicalsci/session4/closer1.html 3. Chemical vs. Physical Change at ​
http://www.chem4kids.com/files/matter_chemphys.html 4. You can also find a couple of videos on BrainPop about Physical and Chemical Changes. 10. Again in your group, complete the table below checking whether you think that the changes described are physical or chemical changes. Be prepared to defend your answers! Example Physical Chemical Frying an egg Tearing paper Sharpening a pencil Breaking a window Rust forming on a bike Lighting off fireworks A tomato rotting Getting a bad hair cut Baking a cake Lighting a match Cutting down a tree Crumbling cookies Burning firewood Melting butter on pancakes 11. As a group, agree on a definition for each term and write it them in the boxes below: Physical Change: Chemical Change: 12. In your group, divide up the following scenarios so that each person in the group has 2 or 3 to do. Have them decide whether a physical or chemical change has occurred and give evidence for their decision. When everyone is done, discuss each scenario and come to some agreement. The first scenario is done for you. Scenario Physical or Chemical Evidence 1. A student removes a loaf of bread hot from the oven. The student cuts a slice off the bread and spreads butter on it. The butter melts. Physical The bread is still bread, even though it was cut. The butter is still butter, just melted. Nothing new was formed. No unexpected changes occurred ­ like gas forming or color changing 2. Your friend decides to toast a piece of bread, but leaves it in the toaster too long and it turns black. The kitchen fills will smoke. 3. You forgot to dry the bread knife after you washed it and it now has reddish­brown spots all over it. 4. You blow dry your hair after taking a shower. 5. In baking biscuits the baking powder reacts to release little bubbles of carbon dioxide gas. This causes the dough to rise. 6. You take out your mother’s fancy silver spoons and notice that they are an ugly blackish­grey and are covered with lots of dark spots. 7. A straight piece of wire is coiled to form a spring. 8. Food color is dropped into water to make it green. 9. 10. After a summer rainstorm the warm sunshine causes the puddles to evaporate from the road. 11. Acid rain damages a marble statue standing out in the open. 12. A bulldozer is used to rip up the old concrete in a parking lot. In a fireworks show, the fireworks explode giving off heat and light. 13. Each person in the group should write 4 quiz questions ­ one each about physical properties, chemical properties, physical changes and chemical changes. These questions (with correct answers )should be written on a separate sheet of paper and attached to the back of this packet. 14. Give the completed packet to a group member for safe keeping until we can discuss your work.