jueves, 18 de octubre de 2012

We must be careful what we drink ...

I found a very cute and funny video about energy drinks as it is a really important issue as their consumption is increasing in adolescents and especially mixed with alcohol, I found very good video for students to see and well perhaps consider.


Best of video is that it provides a solution for those times when we feel tired, we tomarsi instead of reloading the energy body.

Do you think it is necessary to teach teenagers about energy drinks?

With that theme each year it could link high school students?

domingo, 7 de octubre de 2012

Greenhouse...


I found a wonderful video on the Greenhouse Effect.
It explains very well why it happens.
What axions considered important to care the ozone layer?
How to prevent pollution?
Do you think you can really change the world?

viernes, 5 de octubre de 2012

I propose a CHALLENGE...


                                                                                                           
When water begins to evaporate quickly heats up to a
the point where boiling starts.


What do we do?
We will use a paper cup or a balloon piñata to heat water without these
harm comes containers!

Materials

Candle or a lighter
metal support
metal ring
Paper cups or rubber balloons

Procedure

Select a paper cup or a balloon piñata
Place the paper cup into a hoop attached to a support
Adds water to the glass or fill the balloon with water and tie it to the hoop or a clamp

Gently heated the glass with its contents using a candle or a lighter
with the appropriate calls and taking care not to burn
Continue heating. Can you make the water ebulla?
Remove the heat source and allow the water to cool

What happened?
The water absorbs the heat energy rather than paper, and no vessel temperature
rises above the water temperature.
Water is a liquid with a great capacity to absorb heat itself before
heated, thanks to the structure and arrangement of its molecules. It is known that
Water molecules in the solid and liquid states are connected by links 21
hydrogen and therefore large quantity of caloric energy is expended in such break
links; addition, the ignition point of the rubber is much lower than the point of
boiling water and burn before it reaches the water to boil.
It should be noted that the flame should not be too much for the Heat have the time
enough to be absorbed by the system without exceeding the boiling point
water.





To think ...

Why water is the ideal liquid to put out fires?
If water is heated in a glass beaker, why glass gets hotter
the water while the paper?


Chemistry Home and Daily Living


       The chemical industry, manufacturing cleaning products, personal care products and care for children, developing materials for building appliances and enabling optimal food preservation, has contributed decisively to facilitate housework. In primitive economies, engaged 16 hours a day for basic needs, and in the modern world, only two, due to detergents, easy to iron clothes and clean, or frozen foods, for example.

       Starting with the kitchen, she found coated plastic utensils that do not adhere food containers and furniture of the same material, ceramic plates, transparent wrapping films, skid pans, canned and prepared foods internally protected against the effect of fungi and bacteria.
If we move to the living room there are TV, video, audio player, CDs, and tapes ... all made ​​of chemical materials from the lining of the television screens, to magnetic media, passing compact discs.
And in all rooms are chemicals derived elements: carpets, upholstery, fabrics, stuffing pillows, soap, perfume, paint, adhesives, toys, detergents, insecticides, cosmetics ... Look around and find some object for which component not chemistry has played an important role ... and this exercise will be repeated in the plane, car or on the street.

        The chemistry we dress for every occasion: go to the field, swim in the sea, play sports, climb a mountain or go to a party. Natural fibers are difficult to modify and produce a relatively inefficient manner. Synthetic fibers can be altered to meet specific needs and are produced in large quantities easily. In addition, natural fibers are not as natural as they seem. Did you see the wool as the sheep produce, or how is the cotton, having no chemical protection is attacked by a plague of beetles?

      Chemistry also helps us gain higher yields in the use of food, allowing its storage and refrigerated transport, preserving their properties and extending their life, both in slaughterhouses, as in department stores, shops, and Finally, domestic refrigerators and freezers. All these devices work with cryogenic gases "clean" and are thermally insulated with synthetic foams.

Finally must be mentioned the enormous importance of packaging manufactured chemicals for food preservation. These innocent-looking containers are admirable technological pieces. They should be light and strong, and there composed of numerous different film layers, each with specific properties and functions. The selective permeability to gases such as carbon dioxide and oxygen and to moisture and light, polymer-based materials has been used to develop packaging inside a modified atmosphere. If barrier properties are suitably selected, a packaging material can maintain a modified atmosphere within the container, extending the "shelf life" of the product.
Dehydrated products must be protected from moisture during storage. Fatty foods must be protected from the air to reduce oxidation. The fresh fruit, by contrast, must breathe, and it is necessary that the gases circulate container. For all these needs, sometimes contradictory, chemistry has the necessary materials.

        It is also important to highlight the importance of plastics in reducing packaging waste. Because of its strength and light weight allow to develop the main strategy, which consists of the reduction at source, on the other hand paying for recycling and reuse, thus showing their eco-efficiency.




       I think the chemistry is really important because it is in everything we see constantly in our daily lives, so it is very important to teach. But teach it from this point of view, students can see that chemistry is tangible, is, that exists in the life of each one of them, not a scientifically unattainable world. How about you?, Would not it be much easier and fun for our students bring to reality what we teach?, How do you think you could teach chemistry and life at a time?


jueves, 6 de septiembre de 2012



       I wanted to share with you this wonderful place, I think at this time of year many of us would give anything to be at this time there.
In February, a group of classmates we go, due to finish the race, and believe us, we are counting the days ...


miércoles, 29 de agosto de 2012




Hello everybody!
Today is a nice day, we are already halfway through the week and there is little else to finish classes!!
I hope you enjoy this spring day (although fresh medium je) ...

jueves, 23 de agosto de 2012

Albert Einstein


        Albert Einstein definitely was and is the greatest scientist in history.
Born in the Bavarian city of Ulm on March 14, 1879. He was the eldest son of Hermann Einstein and Pauline Koch, both Jews whose families came from Swabia. The following year they moved to Munich, where his father was established, along with his brother Jakob, as a trader in the developments of the era electro.

         Little Albert was a child still and pensive, which had a slow intellectual development. Einstein himself attributed to the fact that slowly have been the only person to develop a theory of relativity as "a normal adult is not concerned about the problems posed by space and time, believing that everything to know what is already known about since early childhood. I, on the contrary, I have had a development so slow that I have begun to wonder questions about space and time until I was old. "

        In 1894, the economic difficulties that the family did (increased since 1881, on the birth of a daughter, Maya) moved to Milan, Einstein stayed in Munich to finish high school, meeting with parents the following year. In the fall of 1896, he began his studies at the Technische Hochschule in Zurich Eidgenossische, where he was a pupil of the mathematician Hermann Minkowski, who later generalized four-dimensional formalism introduced by the theories of his former pupil. The June 23, 1902, began to provide services in the Office of Intellectual Property Confederal Berne, where he worked until 1909. In 1903, he married Mileva Maric, a former fellow student in Zurich, with whom he had two sons, Hans Albert and Eduard, born respectively in 1904 and 1910. In 1919 they divorced and remarried Einstein with his cousin Elsa.

During 1905, five papers published in the Annalen der Physik, the first of them earned a doctoral degree from the University of Zurich, and the remaining four eventually impose a radical change in the image that science offers the universe. Of these, the first providing a theoretical explanation, statistically, Brownian motion and the second gave a photoelectric effect interpretation based on the assumption that light is composed of individual quanta, later called photons, the two remaining work laid the foundations of the theory of relativity, establishing the equivalence between the energy E of a certain quantity of matter and its mass m, in terms of the famous equation E = mc ², where c is the speed of light, which assumed constant.


Einstein's effort placed him immediately among the most eminent physicists of Europe, but the public recognition of the true extent of his theories came quickly, the Nobel Prize in Physics, which was awarded in 1921 it was only "for his work on Brownian motion and its interpretation of the photoelectric effect ". In 1909, he began his career as a university lecturer in Zurich, then going back to Prague and back to Zurich in 1912 to become a professor at the Polytechnic, where he had studied. In 1914 he went to Berlin as a member of the Prussian Academy of Sciences. The outbreak of the First World War forced him to leave his family, then vacation in Switzerland and no longer meet him again.

Against the general feeling of the academic community in Berlin, Einstein then manifested openly antiwar attitudes influenced by the doctrines pacifist Romain Rolland. In scientific terms, its business focused, between 1914 and 1916, in the improvement of the general theory of relativity, based on the assumption that gravity is not a force but a field created by the presence of a mass in the space-time continuum. The confirmation of his predictions came in 1919, to photograph the solar eclipse of May 29, The Times introduced him as the new Newton and his international fame grew, forcing you to multiply your outreach conferences worldwide and popularizing his image Traveler the third class rail, with a violin case under his arm.

Over the next decade, Einstein concentrated on finding a mathematical relationship between electromagnetism and gravitational attraction, determined to move towards that, for him, should be the ultimate goal of physics: discover the common laws that supposedly had govern the behavior of all objects in the universe, from subatomic particles to the stellar bodies. Such research, he held the rest of his life, and eventually unsuccessful acarrearle estrangement from the rest of the scientific community.


Since 1933, with Hitler's accession to power, his loneliness was compounded by the need to renounce his German citizenship and move to the U.S., where he spent the last twenty years of his life at the Institute of Advanced Studies Princeton, the city where he died on April 18, 1955.

Einstein once said that politics had a passenger value, while a value equation for eternity. In the last years of his life, the bitterness over not find the formula to reveal the secret of the unity of the world had to accentuate the need that was felt dramatically intervene in the political sphere. In 1939, urged by physicists Leo Szilard and Wigner Paul, and convinced of the possibility that the Germans were able to build an atomic bomb, addressed to President Roosevelt urging him to undertake a program of research on atomic energy.

After the bombings of Hiroshima and Nagasaki, joined scientists seeking ways to prevent future use of the pump and proposed the formation of a world government from the embryo formed by the United Nations. But his proposals towards mankind avoid destruction threats individually and collectively, made ​​on behalf of a singular amalgam of science, religion and socialism, the politicians received a rejection comparable to criticism respectful scientists raised among successive versions of the idea of a unified field.


http://www.biografiasyvidas.com/monografia/einstein/

To my Einstein was and will be one of the greatest scientists in history, what do you think?, The scientist who was most important to you?

jueves, 2 de agosto de 2012

The atom and its evolution over the course of history:

In the V century. BC, Leuccipus said there was only one type of matter and thought that if we divided the matter into ever smaller parts, we get a piece that could not cut it anymore. Democritus called these chunks atoms ("no division").



In the fourth century BC., Empedocles postulated that matter was composed of 4 elements: earth, air, water and fire.       







Aristotle then postulated that matter was composed of these 4 elements but denies the idea of atom, a fact that was maintained until 200 years later in the thinking of mankind.



In 1808, John Dalton published his atomic theory, which incorporated the old ideas of Leucippus and Democritus. Dalton's theory: 
1. The elements are composed of tiny particles called atoms indivisible and unchanging.

Dalton established a system to designate each atom so that it could distinguish between the different elements:




2. Atoms of an element are all equal to each other in mass, size and on the other physical or chemical properties. By contrast, the atoms of different elements have different mass and properties.

3. The compounds are formed by the union of corresponding elements atoms as a simple numerical ratio constant.

Thomson's atomic model


For such a small mass of electrons, the English physicist J. J. Thomson assumed in 1904 that most of the mass of the atom corresponding to the positive charge, which therefore should occupy most of the atomic volume. Thomson imagined the atom as a kind of continuous positive field in which electrons are embedded (like raisins in a pudding).

Rutherford's atomic model


Thomson's model was widely accepted until in 1911 the English chemist and physicist Ernest Rutherford and his colleagues carried out the "Rutherford Experiment".

In the experiment, bombarded a thin gold foil with alpha particles (positive) from a radioactive material and noted that:

- Most of the alpha particles passed through the film without changing direction, as expected.

- Some alpha particles deviate considerably.
- A few alpha particles rebounded to the emission source

Accordingly, the atom was composed as follows:

- A central zone or core where the total charge is positive (the protons) and most of the mass of the atom, provided by the protons and neutrons.

- An outer zone or cortex where are the electrons orbiting the nucleus.

There are the same electrons in the cortex that protons in the core, so that the whole is electrically neutral atom.

Bohr's atomic model


To solve these problems, the Danish physicist Niels Bohr formulated in 1913, a hypothesis about the atomic structure. His assumptions were:
1) The electron only moves in a circular orbits "allowed" (stable) under which does not emit energy. The electron has a certain energy per orbit, which is greater the more remote the orbit the nucleus.
2) The power output occurs when an electron jumps from an initial state of higher energy to a lower energy.




lunes, 30 de julio de 2012

Water, an extraordinary substance ...


       Water is one of the most extraordinary substance existing, thanks to her there is life on the planet. It is the only substance in liquid is denser than solid state and thanks to that the ice floats, allowing the existence of the iceberg and life under water when frozen seas.
I leave the link of a very good video that explains very well the physical and chemical properties of water.

domingo, 29 de julio de 2012

The BING BANG theory...



      As many know one of the best and most complete explanations of the creation of the universe is the Big Bang theory.
I found online a very good article that explains in detail this theory, which seemed very good to me share with you because the students can go to ask it in class, especially those who are serving 3 rd.
Here I leave the link so they can read.

http://spiff.rit.edu/classes/phys240/lectures/bb/bb.html

Also I leave the link of a video that is very good about the Big Bang theory.

http://www.youtube.com/watch?v=pIn6Evqty_s&feature=player_embedded


                 

Learning theory of Vygotsky

          A few classes ago, we talked about learning theory of Vygotsky, the psychology of this study the activity of the subject and it does not respond to specific stimuli, but uses its transforming activity. To get to the modification of the subject uses stimuli mediating instruments. It is culture that provides the tools necessary to modify the environment, also to be culture consisting mainly of signs or symbols, they act as mediators of the actions.

       For Vygotsky, the social influences on learning rather than the attitudes and beliefs have a profound influence on how you think and what you think. The context is part of the development process and, as such, shape cognitive processes, the social context must be considered at several levels:
A. - The immediate interactive level, consisting of the (those) individuals who (is) the child interacts at the time.
2.-The structural level, constituted by the social structures that influence the child, such as family and school.
3. - The cultural and general social level, constituted by the society at large, such as language, number system


       The influence of context in the development of the child, for example, a child growing up in a rural environment where relationships are specified only to family ties will have a different development to that which is surrounded by cultural environments more conducive . The rural child develop faster your body control and knowledge of the field, the urban environment will have closer cultural and technological aspects.
       To Vygotsky development and personality formation occurs in the very process of teaching and learning.

                         
                                       

lunes, 23 de julio de 2012

I think they're funny...

I would like to share with you two pictures that I find very funny:                                


 ...a great time when Kekule discovered the benzene form, although I don't think it was in the way shown in the picture, jajajaja.




ok, maybe when we graduate we still thinking this!!!!!!!!

miércoles, 4 de julio de 2012

Incredible...

       Today, we had a test in biochemestry, and one of the topics was about the DNA, so I started thinking about the surpraisin of this.

     I do not know about you but I think it's really amazing how the man could get to discover something like that.
The composition of the structure of DNA was discovered in 1953 by two biologists. They know of the existence of nucleic acid and composed, they prepared an article in which they had come to count as the structure of DNA.
I read about this experiment and really surpriced me because it is amazing in which they lived in these Biolos arrived to discover the genetic code.

I was sare with you a link where you can read part of the article published by Watson and Crick (the  scientists who discovered the structure of DNA).

Enjoy it...
http://www.galileog.com/ciencia/biologia/adn/adn1.htm#descubrimientot...

lunes, 25 de junio de 2012

A SIMPLE REFLECTION...

Hello...
In the toxic class were talking about the Hydrosphere and I thought I would share with you the importance of water.
We often forget the importance of water for human life and we are not aware of the rich we are by being able to have water in our homes, while in many countries of the world there are millions of people who die because they not have drinking water. Maybe in some years the whole world and confront the reality of water pollution but who says that it's not too late.As a teachers we should educate our students about pollution and how we can work with small actions such as closing the tap.

Together, we can change the woeld.

Personally, I think in the fourth year of the program when we teach water and its distribution in the planet is extremely important to teach the importance of water in the world. Educating young people as we can make use of it and take care of both. What do you think? Do you think that man does wasting water? How do you think you could take care of water?

jueves, 21 de junio de 2012

Hi, I want to share this picture with you because I think that in this momente the education is reflect in ths picture, because we often must deal with parents witn students.
I don't know if you are agree whit me but, I think that it's a situacion in many highschool.
Kiss you......

lunes, 30 de abril de 2012

Hello....

Hello!!!
This is my new blog.
I'm new in this, but I think that maybe this can be fun.......

andre