Build an Atom - Phet Topics Atoms Atomic Structure Isotope Symbols Atomic Nuclei Description Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas! Sample Learning Goals Use the number of protons, neutrons, and electrons to draw a model of the atom, identify the element, and determine the mass and charge.Predict how addition or subtraction of a proton, neutron, or electron will change the element, the charge, and the mass.Use the element name, mass, and charge to determine the number of protons, neutrons, and electrons.Define proton, neutron, electron, atom, and ion.Generate an isotopic symbol for an atom, given the number of protons, neutrons, and electrons. 10 Incredible Chemical Reaction GIFs Explained We encounter thousands of chemical reactions every day: plants use them in photosynthesis, metals rust over time, and combustion reactions provide us with heat and light, among thousands of other daily uses. Chemical reactions occur when reactants transform into new substances, called products, through creating and breaking bonds between atoms. Sometimes the process creates some pretty wild effects. Check out our top 10 chemical reactions below: 1) Disintegration (Mercury Reacts with Aluminum) Image credit: Theodore Gray via Youtube When aluminum rusts, it creates a protective oxide layer that prevents the aluminum atoms underneath from further rusting. 2) Pharaoh's Serpent (Mercury (II) Thiocyanate Reacts with Oxygen) Image credit: tenkowal via Youtube The reaction depicted above, nicknamed the "Pharoah's Serpent," actually use to be a common classroom demonstration. 3) Explosive Gummi Bear (Heated Potassium Chlorate Reacts with a Gummi Bear) Image credit: ebaum via ebaumsworld.com
Biology activities Autumn leaf display This Double Helix Science Club activity provides instructions on how to make an autumn leaf display. Banana DNA This Double Helix Science Club activity provides instructions on how to extract DNA from a banana. DNA model This activity from CSIRO's Double Helix Science Club provides instructions for making your very own DNA model. Flower power This Double Helix Science Club activity provides instructions on how to dissect a flower. Mushroom flowers This Double Helix Science Club activity provides instructions on how to make images of a mushroom using its spores. Need a hand? Try this activity from CSIRO's Double Helix to make a working hand from just a little cardboard and string. Paper seeds This Double Helix Science Club activity shows you how to make a type of paper that will grow into a plant! Pollen trap When spring is in the air, you might be able to take a closer look at pollen.
REACCIONES QUÍMICAS INORGANICAS Es la parte de la química que se ocupa del cálculo de las cantidades de sustancia que intervienen en una reacción química. Definición Proceso en el que cambia la naturaleza de una o varias sustancias (reactivos), transformándose en otras nuevas(productos). coeficientes estequiométricos, loscuales nos indican la proporción (moles) de las sustancias que intervienen en la reacción (ajuste). Donde A y B son los reactivos, C y D los productos formados tras la reacción, y `x, y, z, t' son los coeficientesestequiométricos. a) 2Na + Cl 2NaCl (irreversible)b) H O (reversible)c) 2H (g) + O (g) 2H O(l) (estados de agregación) Los números de color azul son los coeficientes estequiométricos. Si atendemos al resultado global , las podemos clasificar en los siguientes tipos: Reacciones de Síntesis: Dos elementos químicos se combinan para formar un compuesto: 2Ca + O 2CaO2Mg + O 2MgO2CO + O 2) Reacciones de Descomposición: Una sustancia se descompone en otras más simples: (sueleser mediante calor Q) MgCO MgO + CO Ca(OH) 2KClO
There is no proof in science, but there are mountains of evidence | How to... (Part of the How to Talk to a Global Warming Skeptic guide) Objection: Correlation is not proof of causation. There is no proof that CO2 is the cause of current warming. Answer: There is no “proof” in science — that is a property of mathematics. In science, what matters is the balance of evidence, and theories that can explain that evidence. In the case of anthropogenic global warming, there is a theory (first conceived over 100 years ago) based on well-established laws of physics. Given the lack of any extra planet Earths and a few really large time machines, it is simply impossible to do any better than this. Aside: It is usually interesting to ask just what observations or evidence your skeptic would consider “proof” that global warming is caused by rising CO2 levels.
Tipos de Reacciones y Ecuaciones Químicas Las reacciones químicas, son proceso, en los que, algunas sustancias, se recombinan con otras, para formar, sustancias nuevas; es decir, diferentes a las que tenía al principio. Estas reacciones, se representan, a través de las ecuaciones químicas. Veamos un ejemplo, para explicarlo: se tiene el hidrógeno molecular, más, el oxígeno molecular, que reaccionan, para formar agua. Los principales tipos, de reacciones químicas son: *Reactivos de adición: Aquellos que tienen, dos o más reactivos, que se combinan para formar un producto, generalmente más complejo, que los reactivos anteriores. *Reactivos de descomposición: Aquellos en los que hay, solo un reactivo, que se “rompe”, para formar, dos o más productos; por ejemplo el Carbonato de Calcio, que va a descomponer en óxido de calcio y dióxido de carbono (Ca CO3----˃CaO+CO2). *Óxido-reducción: Los elementos, cambian su número de oxidación, y de esa forma, pierden o ganan electrones.
DESIGN SQUAD NATION . Home Come play again later! Come play again tomorrow!