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1)a. The question is: How salty does the water have to be for an egg to float ?
b. Many object float on the water but others no. In, this Power Point we are going to do an experiment on an egg to see at what density the water has to be for an egg to float.
For this experience we need:
- a spatula
- two glasses
- an electronique scale
- weighing dish
- a beaker

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c)

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Four words we learnt during this project:
-Feather duster : a stick with feathers attached to one end, used for cleaning dust from delicate objects or for finding fingerprints on surface with magnetic powder

- to moisturize: To put a special substance on your skin to stop becoming dry. Used by police when they catch our fingerprints.

-Loop:Pattern in fingers. The ridges enter from one side of a finger, form a curve, and then exit on that same side.

-whorl: Pattern in fingers. Ridges form circularly around a central point on the finger.

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a) By this experiment, we went to show the efficiency of the different protections of the sun (like the sun cream or sunglasses).

Which one protect us the most of the sun ?

b)On a transparent paper, we had highlight bright colors : blue, green, yellow and pink. And on other transparent papers, we had put different sun creams :

The first one Vichy with FPS 50, an other one Garnier with FPS 50 and the last one Nivea with FPS 30.

Under the UV lamp, we had put the transparent paper with highlighter. Over it we put the different papers with sun creams.

After we took off the papers with sun cream and we put between the UV lamp and the colored paper the different sun glasses, the Ray Ban one (sun glasses of quality) and the other one (cheap sun glasses).

c)

d)After this experiments, we saw different reactions.

First we found that the sun creams with FPS 30 reduce a little the colors of the highlighters

and the sun cream with FPS 50 reduce more the colors than the sun cream with FPS 30.

Secondly for the sunglasses, we saw that the two had approximately the same effects.

But we saw a little difference, the RayBan are quite better than the others. With the two sunglasses, we saw that the UV goes to the border of the paper, he is not completely protect.

e)This experiment gave us the answer at our question.

With this results, we have done a conclusion :

For the sun cream, we can see FPS 50 have the better protection. But FPS 30 have also a little protection for the skin.

And for the sunglasses, we see the sunglasses of quality have a quite better protection than the cheap ones but they don't protect totally the eyes from the sun because of the space between the eyes and the glasses. The sunglasses are not enough close to the eyes to catch all the sun rays.

It’s why the sunglasses don’t protect enough from the sun.

f)To improve our experiment, we can take a fabric or a mater which react like the skin, which have the same sensibility. The highlighter react as the UV but they don’t have the same reaction as skin.

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1) tuyau = pipe
2) moisissure = mold

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a) The goal of our experiment is to discovered how to make the bigger one lollipop by changing the saturation of the solution (sugar in water).
Our hypothesis is that if we get more sugar in the water, bigger will be the lollipop.

b) In order to verifiy this hypothesis, we followed the following procedure :
On first, put sugar in a plate and roll the stick in it. In a glassware, heat some water. Afterthat, prepare three containers (here it was a becker) with 100ml each of hot water heat previously. Put the sugar in the three containers by changing the saturation and mark it on the becker : 100g in the first one, 150g in the second one and 200g in the third one. Mise with a spatula until the sugar is dissolved. You can add some food coloring. Afterwards, let the glasses cool and put the three sticks (prepared previously) in the little holl of a pins each. In our experiment, we hadn't got pins, so we finally use some scotch. Put the sticks in the glasses. Be careful !!! They don't have to touch the edge or the bottom. Wait a week.
Finally, put out the sticks of the containers, let it dry in a clean glass during an our and look at the result.

c) Go to the bottom of the page.

d)On first, we can notice that for the recipe with the saturation of sugar about 100g, the experiment had not result, it didn't works. But for the beckers which contains the solutions with the saturations of 150g and 200g of sugar, we had lollipops with crystals of sugar. However, we can see a big difference between these two situations. There is only 3mm of lollipop for the green solution (with 150g of sugar) while for the yellow solution (with 200g of sugar) there is 10 cm of lollipop.

e) with these results, we can conclude that in order to make the bigger one lollipop, we have to change the saturation by get more sugar in the water.

f) We think that in order to improve our experiment, it xill be better to do it with solutions who contains a bigger one saturation of sugar like one of 225g of sugar for 100mm of water and an other one of 250g of sugar for 100mm of water. Also it will be better to use a magnetic stirrer than a spatula for mise the sugar on the water.

Scheme :

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A° In our project the goal was to answer the question :

How to melt ice ?

B° When we started this science project our first idea was to answer the question

How are sanitary protections dangerous to our health ?

But to answer this question, we would have needed a lot of differents chemicals that were practically impossible to get because of their dangerousness.

So we switch to another project : How soap (shampoo,…) can clean our body ?

But at the last minute, we change to another project and this is the final one :

How to melt ice ?

C° To answer this question, we used only 7 objects:

- ice cubes

- salt

- sugar

- a small refrigerator

- a cristalysor

- a small spatula

- a twine

We took some ice cube out of the small refrigerator to put them in the cristalysor, then with the spatula we took some salt tto put it on the ice cube, put the twine on the melting ice and put it back into the refrigerator.

After around 5 minutes, we took the ice cube out of the refrigerator and we were surprised to see that the twine was inside the ice cube .

Then we did almost the same experiment but this after putting the twine inside we didn’t took it to the refrigerator, and this the ice cube was totally melt.

Then we did the same experiment but instead of putting salt on top we put sugar, and put it inside the refrigerator, this time nothing happen as well.

Finally we did the experiment (the one with the sugar) but we didn’t put it in the refrigerator.

D° To conclude this experiment, we can say that the only time the ice melt around the twine was when we put salt on it and put it back into the refrigerator

E° We can conclude that ice only melted with salt, but with the help of a low temperature, the ice can be reformed around the salt, and yes this experiment help us answer our question.

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a) The goal of our experiment is to discover what's a fingerprint and how police takes them ?                                       b)  At the beginning, we did some background researches about fingerprints and we found differents informations and an idea of experiment.Then, at the lab, we started a first experiment which is to take classmates' fingerprints with moisturizing cream and ink. In aim to take fingerprints, we have to put a little bit of cream on the finger and spread it. After this, we put our finger in the ink and catch the fingerprint on a sheet of paper. For recording a fingerprint, we have to, on a clean surface (box) with only the fingerprint on it, put some magnetic powder with a feather duster. After putting the magnetic powder, you take off the surplus with the feather duster. And now, you can discover whose fingerprint it is.                                               c) Schemas at the end.             d) In conclusion, with our experiment, we can find who use the box by comparing the fingerprints on the paper and the one on the object .                                       e) To conclude, with this experiment, we learn what a fingerprint is. For example, now we know that fingerprints are created during the gestation and they don't change with age. When a person grows the pattern changes size but not shape. Also, the exact number, shape and spacing of the ridges change from person to person. Most importantly, there is 3 categories: loop: ridges enter from either side re-curve and past out or tend the same side they entered.Arch: ridges enter from one side make a rise in the center and exit on the other side. Whorl: circular ridges. We also learn how the police takes fingerprints and how they recognize it. First, they take our fingerprint with hydrating cream and ink. Then, they put magnetic powder and afeather duster to record it.                                               f) With an another experiment, we could find why fingerprints are unique with the help of acomputer and the Random DNA Sequence Generator website. 

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a) The goal of our experiment is to discover what's a fingerprint and how police takes them ?                                       b)  At the beginning, we did some background researches about fingerprints and we found differents informations and an idea of experiment.Then, at the lab, we started a first experiment which is to take classmates' fingerprints with moisturizing cream and ink. In aim to take fingerprints, we have to put a little bit of cream on the finger and spread it. After this, we put our finger in the ink and catch the fingerprint on a sheet of paper. For recording a fingerprint, we have to, on a clean surface (box) with only the fingerprint on it, put some magnetic powder with a feather duster. After putting the magnetic powder, you take off the surplus with the feather duster. And now, you can discover whose fingerprint it is.                                               c) Schemas at the end.             d) In conclusion, with our experiment, we can find who use the box by comparing the fingerprints on the paper and the one on the object .                                       e) To conclude, with this experiment, we learn what a fingerprint is. For example, now we know that fingerprints are created during the gestation and they don't change with age. When a person grows the pattern changes size but not shape. Also, the exact number, shape and spacing of the ridges change from person to person. Most importantly, there is 3 categories: loop: ridges enter from either side re-curve and past out or tend the same side they entered.Arch: ridges enter from one side make a rise in the center and exit on the other side. Whorl: circular ridges. We also learn how the police takes fingerprints and how they recognize it. First, they take our fingerprint with hydrating cream and ink. Then, they put magnetic powder and afeather duster to record it.                                               f) With an another experiment, we could find why fingerprints are unique with the help of acomputer and the Random DNA Sequence Generator website. 

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A) The goal of our experiment is to show why when we put mentos in coca there is a reaction?

B) To find why this reaction takes place, we try to do the same experiment without some coca ingredients. In first, we try without sugar(saccharose). After without gas.

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a)      We want to know in which orange juice there is the most vitamin C between commercial orange juice and freshly squeezed orange juice

b)      For our experiment we put 10mL of commercial orange juice with 20mL of water in a beaker. We put 10mL of freshly squeezed orange juice with 20mL of water. We put 3mL of starch in each beaker and we mixed with magnetic stirrer. After that we put the diode solution drop by drop in the two oranges juices with graduated burette. The solution has changed color ; the color move to yellow to black.

c)       Look at the picture at the bottom of the page

d)      For the freshly squeezed orange juice the color has changed after pouring 12,4 mL of diode solution into the beaker.

For the commercial orange juice the color has changed after pouring 9,8 mL of diode solution into the beaker.

The formula to find the mass of vitamin C is 0,88 x V.

0,88 x 12,4 = 10,912 mg

There are 10,912 mg of vitamin C in the freshly squeezed orange juice.

0,88 x 9,8 = 8,624

There are 8,624 mg of vitamin C in the commercial orange juice.

e)      With our experiment we found that there is more vitamin C in the freshly squeezed orange juice.

f)        We could do an experiment to know how many vitamin C there are in one orange.

Equipment for this experiment :

-a few deciliters of alcohol vinegar

-potassium permanganate

-a glass jar

-a pipette

-a filter

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A) The question we wanted to answer is «How does volcanoes are eruptting ?»

B) To verify our answer, we checked some web site about volcanoes and propose our experiment to see what is shooting out the lava from the magma chamber.

We made a supposition in which a lot of gas keep and increase the pressure, like a pressure cooker, and then, the lava blow up very powerfuly.

To confirm our supposition, we made an experimentation with a flak, a tube, a device to mesure pressure, a lid, some vinegar, some bicarbonate and some dye.

C) (see the video at the bottom of the page)

D) Wee saw through our experimentation that the gas made by the reaction until vinegar and bicarbonate make some pressure in the flask and that pressure rises a lot : from 998.2 hPa to 1300.4 hPa. It shows to us that, in the volacanoes, there is gas and that he is very powerful.

E) To conclue and after some research, we saw that the pressure rises in the magma chamber (through the experimentation with the flask). Finally, we saw (throught web sites) that our supposition was right but only for the explosive volcanoes.

F) To acheive our research, we could do an experimentation with a more liquid « lava » to show how the effusive vlocanoes are working.

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a) Note the goal of your experiment  (the question you want to answer)

b)      Explain the procedure

c)       make a scheme

d)      Note your results

e)      Make a conclusion : did your experiment give your the answer of your question? If no, explain problems, …

f)       what could you do to improve your experiment ? OR what other experiment could you do?1)      Prepare a report        a) Note the goal of your experiment  (the question you want to answer)