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Chemical and physical change

annalise, lisa and kimberley
by

annalise valastro

on 10 June 2011

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Transcript of Chemical and physical change

Chemical and Physical Change!!! chemical change!!! A chemical change is when a substance has completely changed it's form e.g: when you burn a piece of paper, you can't change it back because it is now formed to ash. Physical Change!!! A physical change is when a subtance has changed visualy, but not completely e.g: if you scrunch up a piece of paper, you can undo it. Lava Lamp!!! - Water
- Vegetable Oil
- Food Dye
- Fizzy Tablets
- a clear plastic bottle
- a Funnel Experiments we have done!!! Method: Rock Candy!!! ingredIEnts: method: IngrediEnts: •
1.Clip the wooden skewer into the clothespin so that it hangs down inside the glass and is about 1 inch (2.5 cm) from the bottom of the glass. (as shown)
2.Remove the skewer and clothespin and put them aside for now.
3.Get a helpful adult!
4.Pour the water into a pan and bring it to boil.
5. Pour about 1/4 cup of sugar into the boiling water, stirring until it dissolves.
6.Keep adding more and more sugar, each time stirring it until it dissolves, until no more will dissolve. This will take time and patience and it will take longer for the sugar to dissolve each time.Be sure you don't give up too soon. Once no more sugar will dissolve, remove it from heat and allow it to cool for at least 20 minutes.
7.NOTE: While it is cooling, some peole like to dip half of the skewer in the sugar solution and then roll it in some sugar to help jump start the crystal growth. If you do this, be sure to let the skewer cool completely so that sugar crystals do not fall off when you place it back in the glass.
8.Have your friendly ADULT carefully pour the sugar solution into the jar almost to the top. Then submerge the skewer back into the glass making sure that it is hanging straight down the middle without touching the sides.
9.Allow the jar to fully cool and put it someplace where it will not be disturbed.
10.Now just wait. The sugar crystals will grow over the next 3-7 days. A wooden skewer (you can also use a clean wooden chopstick)
•A clothespin
•1 cup of water
•2-3 cups of sugar
•A tall narrow glass or jar This video is about chemical and physical change. We think that this video is really good to show what chemical and physical change is. 1.Measure three teaspoons of PVA glue into the plastic cup.
2.Add three teaspoons of water and stir.
3.Add a couple of drops of the food colouring of your choice (traditionally slime is green).
4.Place approximately one cup of water into the other plastic cup.
5.Stir in one heaped teaspoon of Borax powder. Once the mixture has been stirred thoroughly you have made a Borax solution.
6.Add one teaspoon of Borax solution to the glue paste and stir. As you stir the slime should start to form. You might need to add a little more Borax solution. Be careful when you are adding the Borax solution. If you add too much your slime will go hard.
7.If your slime feels very wet and slippery (but is not still runny), remove it from the container and knead it in your hands. In a few minutes, any extra Borax solution will evaporate or be absorbed.
8.Place the slime into a sealable plastic bag and it should go hard. PVA glue
food colouring
water
Borax
two plastic cups or similar containers
a sealable plastic bag
some paper towels
a pop stick for stirring
at least two plastic spoons. IngrediEnts: method: glue goo!!! our lava lamp!!! We made a lava lamp, and it was really cool. It was a chemical change because you can't change it back to oil, water, and Barocka's again. We made a lava lamp. It was a chemical change because you can't change it back to oil, water and barocka's!!! our glue goo!!! We made Glue Goo. It was a Chemical Change because you can't change it back to PVA glue, water and Borax. It didn't work because we added Bi-Carb Soda instead of Borax because we didn't have any!!! 1.Pour water into the plastic bottle until it is around one quarter full (you might want to use a funnel when filling the bottle so you don't spill anything).
2.Pour in vegetable oil until the bottle is nearly full.
3.Wait until the oil and water have separated.
4.Add around a dozen drops of food coloring to the bottle (choose any color you like).
5.Watch as the food coloring falls through the oil and mixes with the water.
6.Cut an Alka-Seltzer tablet into smaller pieces (around 5 or 6) and drop one of them into the bottle, things should start getting a little crazy, just like a real lava lamp!
7.When the bubbling stops, add another piece of Alka-Seltzer and enjoy the show! Our rock candy!!! We made rock candy. It was a Physical Change because the water can evaporate and the sugar is just sugar all over again. it worked in the end!!! :) ;) Fire works are a chemical change because once they explode, you can't change it back to its origninal form. An apple is a Physical Change because if you take a bite it may change colour, but it is still the same apple!!! examples of chemical and physical change !!! by kimberley taliana,
annalise valastro and
: ) lisA LEE!!! : )
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