Alyssa+R's+Science+Page

This is my Science Page.

Here is what I learned during our study of Structures and Mechanisms.

This is our bridge we came in 3rd place in the bridge building compettiton, we learned that it is important to have lots of stability,and strength.for our bridge to carry our load we used strong tight rods and lots of tape to make it sturdy in real life though,you would have to use cement ant metal to make it sturdy.



when we built our house out of popsicle sticks, we had to make sure that if there were a storm or hurican or it snowed the weight from those storms will carry through the house and down into the ground so our roof and walls would not collapse. when we made our egg protector we had to make sure that it could protect our egg from breaking and to make sure that our egg would not hit the floor so we had to desingni first.we only had a certain amount of materials we could use.we ended up coming in 3rd.

when we did the experiment with different ingredients and iodine we had, corn starch,salt,sugar,and baking soda.when we mixed the iodine with the corn starch it turned black and felt like wet chalk almost. when we mixed the sugar with it,it turned brown and became alittle wet and it also started to combine together. when we mixedthe baking soda and iodine it turned a very light brown and it was not powdery any more it also felt kinda smoothe after. when we mixed the iodine with the salt it had pretty much the same reaction as the sugar,it turned a little bit darker of a brown though and it combined a little better than the sugar.

all of these changes were physical changes because if you took all of the iodine out. The salt would be salt, the sugar would be sugar, the baking soda would be baking soda and the corn starch would be corn starch.

With this experiment we used steel wool and we put some in each test tube ,then we labeled each tube a different name we put salt in one ,sugar in another,nothing in the next, vinager in another and proxide in the other and water in the last.what happened with the water and steel wool was it became rusty.with the sugar suluotion and steel wool it also became rusty but had a sweet stench to it.when we had the salt suluotion and steel wool it went kinda green and rusty and smelt a little like a salt water pool that had hot dog water in it.what happened with the vinager and steel wool was it turned a yellowy green colour and had a very strong unige smell.what happened with the proxide and steel wool was it turned a brown gren yellowyish colour and smelled like nothing.the nothing and steel wool was that nothing happened it it stayed the same. all of this was a chemical change the steel wool can not be steel wool any more and the ingredients can not be turned back to normal.

My science report. Earaser. Extraction.

1.What are the natrual resources used in an eraser? The natural resources used in an eraser are rubber and sometimes pumice is added to make the eraser more abrasive.

2.Where are the resources obtained?

The rubber is obtained from rubber trees. Pumice is obtained from a volcanic rock.

3. How are the resources obtained?

Rubber is obtained from tapping a rubber tree and the milky sap called latex comes spilling out of the tree.

Pumice is formed when lava cools very quickly above ground. The vesicles or tiny holes all over are formed when heavy amounts of gas escape from the lava while cooling, leaving those air pockets. Even though it doesn't seem like it, pumice has a glassy texture just like obsidian glass, both of which form in very similar ways.

Rubber Trees grow mostly in Brazil. But they can also grow in other places. The first place that the rubber tree was grown outside of Brazil was in the botanical gardens in England. vinyl is mined in madagascar in the vinyl mines.sulpher occurs naturally in the enviroment. Vegetable oil comes from seeds and nuts that have been sqeezed and squished so that the oil from the nuts and seeds comes out.

4. Describe the the enviromnental consequences of extraction.

The environmental consequences are that if the tappers who tap the rubber trees tap the slits to thick or to thin it could damage the tree and it will stop growing or die.the envronmental consequences for mining pumice are soil erosion, deforestation and water contamanation.

Production.

5. Describe the changes the resource materials undergo.

The collected latex passes through a sieve to remove foreign objects.Some water is added to the latex and the water and latex is pumped into big horizontal tanks,with that have aluminum partitions in them.Dilute acetic acid or formic acid is added to the mixture to make rubber coagulateinto slabs on the partitions.The slabs are sprayed with water while they go through a bunch of rollers.Excess water is removedby a bunch more rollers.the slabs get pcked into bales that weigh 225 -250 Ib that are shaped like cubes that are 60 cm on each side.the bales get coated with clay to revent sticking,bound with metal then shipped to manufacturers.The rubber arives at the eraser factory, and gets mixed with pigments,vegetable oil,pumice,and sulfur.once it is mixed with every thing else it is heated and the erasers are formed.To make eraser plugs that will be attached to ends of pencilsthe rubber mixture is extruded and cut into plugs.in order to make rectangular erasers the mixture is put into molds and then they get cooled.

6. What waste materials are produced?

There appears to be no waste by products from this natural process.

7. What are the evironmental consequences of production?

The environmental consequences of production are the smog that the factory puffs out,and the smog that it spills out.The smog polutes the air and the other smog polutes the lakes rivers,etc.

8. How is the product distributed?

An eraser is distributed by ship or truck depending on how far away the buyer is.

9. Describe the environmental consequences of distribution.

The evironmental consequences of distributing an eraser is thet the vehical and ship puffs out smog and polutes the air.

10. How long does the product last?

An eraser lasts for about three years or until you have used it till you can use it no more.I know that my erasers usualy last until i use them.

11. How is the product disposed of.

If you wanted to recycle an eraser they would take the eraser and melt it together with the other erasers to remake another eraser.

12. Does the product naturaly break down?

The natural rubber itself will break down through a long period of time.when it is mixed with the other ingrdients though it will not break down.

13. Can your product be recycled?

Yes, an eraser can be recycled becuse they just melt the old erasers together to form new erasers.

14. Decribe the environmental consequences of disposal.

The environmental consequences of the disposal of an eraser are that it will not break down naturaly leaving it there forever.

15. Is the production of your product sustainable?

We can still grow rubber trees over and over again we will never run out but we can not get pumice forever because we will eventually run out of it becuase it is a rock and we can not mine it forever so no it is not sustainable.



There are pink erasers,white erasers,pink and blue erasers and just plain fun erasers. Erasers are amazing and neat!



Tranformationss in the Roll Back Can. We experimented on all sorts of energy. My group did the Roll Back Can.In the Roll Back Can, there were pennies attached to an elastic that attached to the can. The pennies wound the elastic up when we rolled the can and then the elastic rewound and the can rolled back. The transformation from the elastic turning, is called elastic energy. The next transformation of energy is, the friction from the can rubbing against the floor creates heat which is called thermal energy. Tranformations of energy are simple and easy to understand.