Physical and Chemical Changes - ProTeacher Community


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Physical and Chemical Changes
Old 09-28-2006, 08:20 PM
 
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Does anyone have any Physical and Chemical Changes experiments that I can demonstrate in class, so that my students can get a visual...


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Physical and chemical changes
Old 09-29-2006, 04:59 PM
 
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Physical changes are easy - tear paper, cut an orange, break a pencil, mold clay, put a flpwer in water with food coloring

Chemical changes, burn something -- (paper)

Let steel wool sit in water so they can see that it rusts

Put a penny on a paper towel soaked in vinegar and see it tarnish

cut an apple adn let it turn brown
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Old 09-30-2006, 04:24 PM
 
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This one too, the kids love it.

Put food coloring in water - physical change

Add bleach (about 10 mL) - chemical change. It takes a few minutes but the water will go back to clear.

Baking soda in water - physical change (solubility)

Baking soda in vinegar - chemical change.

If you have a flask or a bottle of water you can do this one and right after you add the baking soda put a balloon over the top and as it mixes the gasses will blow up the balloon. You can also do this with water and baking soda and they can see that nothing happens to the ballon.
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physica/chemical changes
Old 10-01-2006, 08:31 PM
 
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Utah has a complete unit on them -coreacademyusu.edu- and they are really good.
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ahh... my favorite area of science
Old 04-09-2007, 04:53 PM
 
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1. Alka-Seltzer in a 35 mm film canister. Fill half-way with water and add a tablet. Put the lid on and set it down. You can even give it a little shake. I definitely make sure my kids wear goggles when we do this because some lids really take off.

2. Mentos and Coke: Buy a 2L of Coke and Dt.Coke (room temp.) and 2 rolls of Mentos (regular). I put the Mentos in a test tube and covered with my business card over top of the opened 2L. Remove the card and run because this is an instant reaction. This is a great activity to do OUTDOORS. This could be a fun, but expensive experiment to change a few variables around to see what would happen.

3. Another twist to making steel wool rust is to dip it into vinegar and let it sit on a paper towel. It will start to rust in about 5 min. Of course, if you leave it overnight, the rust is even better.

4. a burning candle or tea light

5. Curdle milk with vinegar (cider type). This looks like cottage cheese and really smells!!!

6. Dancing raisins: Mix a solution of water and vinegar and add baking soda. Gas bubbles visably form on the raisins which cause them to rise, then lower once the bubbles pop.

Let me know if you need more ideas.


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chemical physical reactions
Old 09-01-2007, 06:43 AM
 
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is adding food color to water a chemical or physical reaction
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chemical chages experiments
Old 02-11-2009, 02:19 AM
 
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i need this information for doing in school. kindly help me imm.
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Old 02-28-2011, 01:20 PM
 
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Thanks so much this is helping me with a science project
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Not an experiment but...
Old 02-28-2011, 01:32 PM
 
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my students really enjoy doing this. For physical changes, I have students tear up a piece of paper. The paper has still kep all of its qualities. For chemical changes, we make pancakes or waffles.
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Hmmm
Old 05-29-2011, 03:12 AM
 
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it is a physical change !!!!! gosh
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Old 12-10-2011, 04:41 AM
 
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does any one have a really good chemical or physical change for an experiment.
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Elephant Toothpaste
Old 03-13-2012, 03:07 PM
 
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this experiment has hydro peroxide, yeast/ warm water, and a little dish soap. I tryed it today it was really fun and cool
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Experiment to make Oxygen
Old 04-18-2012, 01:37 PM
 
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One thing that I find cool is that if you mix hydrogen peroxide and yeast together in a sealed plastic bag, it makes oxygen. To test that, break a Popsicle stick in half and light the end on fire. Blow out the flame but leave some embers. Quickly, open the bag and put the Popsicle stick in it. The popsicle stick will catch back on fire! This isn't a chem/phys change but it's a cool experiment. Give it a try!
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great
Old 05-15-2012, 08:19 AM
 
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this seem really fun thnx
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Chemical Change expirement- HELP????
Old 11-24-2012, 12:30 PM
 
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I need to do a chemical change expirement infront of my class. However, it cannot involve burning anything, or using vinegar and baking soda.........
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Old 11-24-2012, 12:31 PM
 
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it is a physical change. However, if you add bleach to the colored water, it is a chemical change.
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Physical and Chemical Change Experiment
Old 11-24-2012, 12:46 PM
 
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Place an ice cube in a snack size zip lock baggie. Time how long it takes to melt. You might put one in the window sill and another somewhere else in the room.

When the cube is melted add a Alka-Seltzer tablet. Then zip the snack size baggie closed again. The tablet will dissolve in the water and the chemical reaction will produce gas and the snack size baggie will inflate well.
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