miércoles, 5 de junio de 2013
GAMES-VIDEOS
http://www.sciencekids.co.nz/gamesactivities.html
http://www.sciencemuseum.org.uk/onlinestuff/games/
http://resources.woodlands-junior.kent.sch.uk/revision/science/
http://www.scienceworld.ca/sites/default/files/flash/games/engagingscience/index.html
http://www.physicsclassroom.com/Class/newtlaws/u2l1a.cfm
http://science.discovery.com/games-and-interactives/newtons-laws-of-motion-interactive.htm
http://science.k12flash.com/newton3lawsmotion.html
http://teachertech.rice.edu/Participants/louviere/Newton/laws.html
martes, 4 de junio de 2013
SCIENCE FAIR
Science fair ppt:
http://www.slideshare.net/matias_lopera-A/science-fair-ppt?utm_source=ss&utm_medium=upload&utm_campaign=quick-view
Br: Matias Lopera
http://www.slideshare.net/matias_lopera-A/science-fair-ppt?utm_source=ss&utm_medium=upload&utm_campaign=quick-view
Br: Matias Lopera
jueves, 7 de marzo de 2013
Chemical proces
§Chemical:
§-Burning
§-Electrolisis
§-Neutralization
§- Corrison
§-Reduction
§-Ionization
§-Fermentation
§What is chemical: In its
most basic form, a chemical is an element, in that it has a specific molecular
composition and may be produced by or used during a natural chemical process.
§ An element is a chemical
substance made of specific kinds of atoms that cannot be broken down any
further; in short, elements are the purest forms of chemicals known to man.
§When multiple chemicals combine,
a chemical compound is formed, which exists in order to combine different types
of elements, and therefore, different reactions.
§What is chemical burning: Most chemical burns occur on the face,
eyes, hands, arms, and legs. Usually a chemical burn will be relatively small
and will require only outpatient treatment. Chemical burns can be deceiving,
however. Some agents can cause deep tissue damage that is not readily apparent
when people first look at it.
§Tissue damage from chemical burns depends on several factors.
§Chemical Electrolisis: how electrolysis can
cause a chemical reaction to occur, suppose we pass a direct electrical current through
1 M HCl. The H3O+ ions in this solution
will be attracted to the cathode, and the Cl– ions will migrate
toward the anode. At the cathode, H3O+ will be reduced to H2 gas according to the
half-equation.
§2H+ + 2e– → H2 (1a)
§Chemical neutralization:
chemical reaction, according to the Arrhenius theory of acids and bases,
in which a water solution of acid is mixed with a water solution of base to
form a salt and water; this reaction is complete only if the resulting solution
has neither acidic nor basic properties. Such a solution is called a neutral
solution. Complete neutralization can take place when a strong acid, such as
hydrochloric acid, HCl, is mixed with a strong
base, such as sodium hydroxide, NaOH. Strong acids and strong
bases completely break up, or dissociate, into their constituent ions when they
dissolve in water.
§Chemical Ionization: (EI) was introduced by Field and Munson
(1966). Their work stemmed from earlier
observations that some molecules introduced into an EI source at high pressure
would generate ions of the type [M+H]+ rather than the conventional M+
molecular ion. This process, which
became known as "self - CI" generated stable molecular species, so
Field and Munson sought to deliberately generate this type of species from a
wide range of molecular classes.
§§Chemical Fermentation: originally, the foaming that occurs during
the manufacture of wine and beer, a process at least 10,000 years old. That the
frothing results from the evolution of carbon dioxide gas was not recognized
until the 17th century. Louis Pasteur in the 19th century used the term
fermentation in a narrow sense to describe the changes brought about by yeasts
and other microorganisms growing in the absence of air (anaerobically); he also
recognized that ethyl alcohol and carbon dioxide are not the only products of
fermentation.
By: Matías lopera
miércoles, 6 de marzo de 2013
PHYSICAL AND CHEMICAL PROPERTIES
§Physical and Chemical Properties
§All substances have properties that we can use to identify them.
For example we can identify a person by their face, their voice, height, finger
prints, DNA etc.. The more of these properties that we can identify, the better
we know the person. In a similar way matter has properties - and there are many
of them. There are two basic types of properties that we can associate with
matter. These properties are called Physical properties and Chemical
properties:
§
§Physical properties: Properties
that do not change the chemical nature of matter
§Chemical properties: Properties
that do change the chemical nature of matter
§Physical properties are those that can be observed without changing
the identity of the substance. The general properties of matter such as color,
density, hardness, are examples of physical properties. Properties that
describe how a substance changes into a completely different substance are
called chemical properties. Flammability and corrosion/oxidation resistance are
examples of chemical properties
§Examples of physical properties are: color, smell, freezing point,
boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or
repulsion (diamagnetic) to magnets, opacity, viscosity and density. There are
many more examples. Note that measuring each of these properties will not alter
the basic nature of the substance.
§
§Examples of chemical properties are: heat of combustion, reactivity
with water, PH, and electromotive force.
§
§The more properties we can identify for a substance, the better we
know the nature of that substance. These properties can then help us model the
substance and thus understand how this substance will behave under various
conditions.
§The difference between a physical and chemical property is
straightforward until the phase of the material is considered. When a material
changes from a solid to a liquid to a vapor it seems like them become a
difference substance. However, when a material melts, solidifies, vaporizes,
condenses or sublimes, only the state of the substance changes. Consider ice,
liquid water, and water vapor, they are all simply H2O. Phase is a physical
property of matter and matter can exist in four phases – solid, liquid, gas and
plasma.
PHYSICAL PROCES
§A sustained phenomenon or one marked by
gradual changes through a series of states
§DESTILATION:Distillation is a widely
used method for separating mixtures based on differences in the conditions
required to change the phase of components of the mixture. To separate a
mixture of liquids, the liquid can be heated to force components, which have
different boiling points, into the gas phase.
§
§EVAPORATION Evaporation is the process by which
water is converted from its liquid form to its vapor form and thus transferred
from land and water masses to the atmosphere. Evaporation from the oceans
accounts for 80% of the water delivered as precipitation, with the balance occurring
on land, inland waters and plant surfaces.
§FILTRATION:The act or process of
filtering, especially the process of passing a liquid or gas, such as air,
through a filter in order to remove solid particles.
§
§DECANTATION:Decantation is a very quick
method for separating a mixture of a liquid and a heavier solid.
BY: MATIAS LOPERA
atomic models
ATOM MODELS
Thomson:
by: andres, correa
Thomson:
§Thomson's atomic model is a theory of
atomic structure proposed in 1904 by Joseph John Thomson, who discovered the
electrón1 in 1897, long before the discovery of the proton and the neutron. In
this model, the atom is composed of negatively charged electrons in an atom
positive pasas.2 as pudding was thought that the electrons are distributed
uniformly around the atom. At other times, instead of a cloud of negative
charge was running with a cloud of positive charge.
Rutherford:
§In 1909 Ernest Rutherford
conducted what is now a famous experiment where he bombarded gold foil with
alpha particles (Helium nuclei). A source which undergoes alpha decay is
placed in a lead box with a small hole in it. Any of the alpha particles
which hit the inside of the box are simply stopped by the box. Only those
which pass through the opening are allowed to escape, and they follow a
straight line to the gold foil. The animation below shows the experiment in action.
Bohr:
§Bohr used these observations to
argue that the energy of a bound electron is "quantized."
Quantized is a fancy word meaning only certain quantities of energy are
allowed. This explanation addresses the true origin
of light. Since only certain
energy levels are allowed it is actually possible to diagram the atom in terms
of its energy levels. In the animation below you will see a model of a
Hydrogen atom and to the right of it, a Bohr energy level diagram.
Cloud:
§The cloud model represents a
sort of history of where the electron has probably been and where it is likely
to be going. The red dot in the middle represents the nucleus while the
red dot around the outside represents an instance of the electron.
Imagine, as the electron moves it leaves a trace of where it was. This
collection of traces quickly begins to resemble a cloud. The probable
locations of the electron predicted by Schrödinger's equation happen to
coincide with the locations specified in Bohr's model.
reference:
by: andres, correa
Physical and chemical
Physical and chemical
PHYSICAL PROCESS
§A sustained phenomenon or one marked by
gradual changes through a series of states
§EVAPORATION Evaporation is the process by which water is converted from its liquid form to its vapor form and thus transferred from land and water masses to the atmosphere. Evaporation from the oceans accounts for 80% of the water delivered as precipitation, with the balance occurring on land, inland waters and plant surfaces.
§A sustained phenomenon or one marked by gradual changes through a series of states
§DESTILATION: Distillation is a widely used method for separating mixtures based on differences in the conditions required to change the phase of components of the mixture. To separate a mixture of liquids, the liquid can be heated to force components, which have different boiling points, into the gas phase.
§FILTRATION:The act or process of filtering, especially the process of passing a liquid or gas, such as air, through a filter in order to remove solid particles.
§DECANTATION: Decantation is a very quick method for separating a mixture of a liquid and a heavier solid.
reference:
by: Andres Correa
§EVAPORATION Evaporation is the process by which water is converted from its liquid form to its vapor form and thus transferred from land and water masses to the atmosphere. Evaporation from the oceans accounts for 80% of the water delivered as precipitation, with the balance occurring on land, inland waters and plant surfaces.
§A sustained phenomenon or one marked by gradual changes through a series of states
§DESTILATION: Distillation is a widely used method for separating mixtures based on differences in the conditions required to change the phase of components of the mixture. To separate a mixture of liquids, the liquid can be heated to force components, which have different boiling points, into the gas phase.
§FILTRATION:The act or process of filtering, especially the process of passing a liquid or gas, such as air, through a filter in order to remove solid particles.
§DECANTATION: Decantation is a very quick method for separating a mixture of a liquid and a heavier solid.
reference:
http://www.google.com.co/search?um=1&hl=es-419&tbo=d&biw=1347&bih=646&tbm=isch&sa=1&q=filtration+lab&oq=filtration+lab&gs_l=img.3...4018.10966.0.11357.22.15.4.3.3.0.220.1717.2j12j1.15.0...0.0...1c.1.3.img.vBvgWBBpPuM#imgrc=M0icZkOGctaffM%3A%3Btx8sYn4xrURJCM%3Bhttps%253A%252F%252Fmycotopia.net%252Fforums%252Fattachments%252Fbotanicals%252F206342d1295317151-peek-into-clandestine-chemistry-lab-filtration-buchner-funnel.jpeg%3Bhttps%253A%252F%252Fmycotopia.net%252Fforums%252Fbotanicals%252F76533-peek-into-clandestine-chemistry-lab.html%3B299%3B249
by: Andres Correa
SCIENCE FAIR:
SCIENCE FAIR
Publicado por: Matias Lopera
Publicado por: Matias Lopera
CAN THE PLANTS INCLINE TO THE
MAGNETS AND IT CAN AFFECT THE GROWTH OF THE PLANT?
ALBERTO
AGUDELO,SIMÓN GALINDO AND MATIAS LOPERA. 7-A
VERMONT SCHOOL
Can the plants incline to the
magnets and it can affect the growth of the plant?
Colegio
Gimnasio Vermont Medellín
Science
7_A
By
MATIAS
LOPERA,SIMÓN GALINDO AND ALBERTO AGUDELO
Medellín,
Antioquia
Mes, año
Can
the plants incline to the magnets and it can affect the growth of the plant?
Introduction….
In this Apa Template we are going
to see if magnetism affect the plants growth,see more about what is the
magnetism and how plants grow and change.
Theoretical
Background:
Magnetisnm:
Magnetism is the
force generated by any moving charged particle or charged particles. A magnetic
field is the result of the motion of a charged particle or charged particles,
and this field is generated in no other way. Any time a charged particle
moves, it creates a magnetic field around its path of travel. There are no
exceptions that we know of. Magnetism is a term that speaks to the phenomenon
associated with a magnetic field and with its action on other things.
The creation of a
magnetic field by a moving charge or moving charges is this fundamental concept
that is behind the term electromagnetic force, which is one of the four
fundamental forces in the universe. Electricity and magnetism are tied together
inextricably because of this
Does magnetism affect plants
growth?
A study was conducted to test the hypothesis that
a magnetic field can affect plant growth and health. The study divided plants
into three groups. The first group of plant seeds grew in a low magnetic field.
The second group grew in a high magnetic field. The third group grew in the
absence of a magnetic field, serving as a control group. Several growth
parameters were measured, including the germination rate, plant height, and
leaf size. In addition, the health status was measured by leaf color, spots, the
stem curvature, and the death rate. Plant growth was observed continuously for
four weeks. The results showed that magnetism had a significant positive effect
on plant growth. Plant seeds under the influence of the magnetic field had a
higher germination rate, and these plants grew taller, larger, and healthier
than those in the control group. No adverse effects of magnetism on plant
growth were noticed. However, the removal of the magnetic field weakened the
plant stem, suggesting the role of magnetism in supplying plants with energy.
How do plants grow and change?
Plants
need some primary needs to grow and change: They are water and sunlight.
The
plants start off as a seed and then slowly
develops into a seedling.During this moment the embryo help the seed to
supply food.
Later
the seed make the root grow. They need also carbon dioxide and oxygen to grow.
After a long time,with good conditions for the plant,the stem and the leaves
will appear.
1.
Objectives
1.
To
see if plants can grow with magnetisim and how affect?
2.
Know
more about the plants and their growth.
3.
Have
a good time with a funny project.
4.
Increase
our knowledge.
5.
See
our plant change using magnetism
2.
Materials
and Reactives
Materials
|
Reactives
|
Pots
(3)
|
Sunlight
|
Corn
seeds(1)
|
Water
|
Bean
seeds(1)
|
Soil
|
Mandarin
seed(1)
|
|
Magnets
(1)
|
|
Ruler
of about 30 cm. (1)
|
3.
Procedure
1.
Get all the materials.
2.
Place soil in the three pots.
3.
Plant the three seeds in the three pots.
4.
Place them in a wall because in a wall they will be protected of the cold.
5.
Put the magnets in front of two pots.
6.
They will have the same condition.
7.
Put them in the sun light and give them water
8.
Wait about 5 days and see if they have growth.
9.
Record data and take pictures of the project.
References
1. http://www.selah.k12.wa.us/soar/sciproj2001/JakeH.html
2.http://wiki.answers
3.http://www.selah.k12.wa.us/SOAR/SciProj2
jueves, 31 de enero de 2013
DICHOTOMUS KEY
publicado por: Andres Correa
dichotomus key:
is a path or route to helps us, with some strategies, to identify, organize and classify the living things.
Dichotomus means: divide into groups that are not a like.
example:
dichotomus key:
is a path or route to helps us, with some strategies, to identify, organize and classify the living things.
Dichotomus means: divide into groups that are not a like.
example:
jueves, 24 de enero de 2013
miércoles, 23 de enero de 2013
TAXONOMY
Publicado por: Matias Lopera
DEFINITION: THE CLASSIFICATION OF ORGANISMS IN AN ORDERED SYSTEM THAT INDICATES NATURAL RELATIONSHIPS.
FUNCTION: TO CLASSIFY, CATEGORIZE, ORDER, NAME IN AN ORGANIZED WAY FOR THE LIVING THINGS BY THEIR NATURAL RELATIONSHIPS.
DEFINITION: THE CLASSIFICATION OF ORGANISMS IN AN ORDERED SYSTEM THAT INDICATES NATURAL RELATIONSHIPS.
FUNCTION: TO CLASSIFY, CATEGORIZE, ORDER, NAME IN AN ORGANIZED WAY FOR THE LIVING THINGS BY THEIR NATURAL RELATIONSHIPS.
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