my presentation of me.

Hello, I am James

I am 15 year old. I live in Biarritz it's a surfers' town :). I play American football with a classmate Antoine Glory, I surf and skate. It has been 4 years since I have lived here. Before, I was living in Paris since I was 3 months old. And before that, I was born on the 11/06/1998 in Dallas/Texas USA. Then every summer I go there to visit my Dad and my family. I live with my mom, grand-mother and older sister. I have chosen Labatory science and Technology (stl), because a scientifque would of been to hard for me. With this diploma I want to be an enginer in the American Navy. It has been my dream since i was little. On the picture, I am kneeling, I am on the first row, wearing a shirt, on top of a white shirt with red letters on it saying:"Enjoy California", I am wearing blue pants with a pair of vans. I am also doing the surfer's sign with a huge smile.

Can you find me?

             

My presentation !

HI ! My name is Léa Pasternak and I am 17 years old. I live in Biarritz and my High School is Andre Malraux. I have chosen Laboratory Sciences and Technology (STL) because I like experimenting in a laboratory and I would like to work in cosmetology field later.

On the photo, I am the girl with the blue and orange pattern dress.

My presentation

HI! My name is Eva Hirigoyen and I am 16 years old. I live in Biarritz and my High School is in this town.
Its name is Andre Malraux. I have chosen Laboratory Sciences and technology (STL)  because I like very much carrying out in a laboratory.
On the photo I am the girl at the bottom in blue.

Presentation!

My name is Paul I live in Biarritz I chose Laboratory Science and Technology(STL) because I like experimenting. I am on the photo "Dream team number 2" at the left I'm standing with a blue skirt.

My presentation

My name is Tom AVRIL, I live in Biarritz I'm 16 years old, I've chosen the laboratory Science and Technology option because I want to do more chemistry theory and I really like to do experiments in physics. On the photo, I'm bottom left.

Basic-acid dosage

What is a dosage ?
Is to determine the amount of a chemical species.

how to make dosage?

hydrochloric acid assayed by a sodium hydroxide solution 
It is necessary to determine the concentration of the hydrochloric acid 
we will take a precise volume of solution (H+Cl-) 
to detect equivalence poured bromothymol blue.

Evolution of pH during dosage 

It is noted that the color is yellow at the start so that there is no acid,
then poured soda thus increasing pH (because disappearance of H + ions),
the solution turns blue, therefore the pH thereof is neutral,
it is called equivalence.
 

Alkanes

Alkanes are composed of carbon atoms and hydrogen atoms. Linear alkanes have the molecular formula CnH2n+2. Alkanes exist largely as a gas. As all hydrocarbons, they are insoluble in water.