Patrocinadores Principais
Faz doações para resolver os problemas sociais e ambientais mais graves enfrentados pela sociedade, onde o capital de risco, responsavelmente investido, pode fazer a diferença ao longo do tempo.
National Science Foundation
Uma agência federal independente criada pelo Congresso em 1950 para promover o progresso da ciência.
Universidade Rei Saud pretende tornar-se líder na inovação pedagógica e tecnológica, a descoberta científica e a criatividade através da promoção de uma atmosfera de inspiração intelectual e da parceria para a prosperidade da sociedade.
A Fundação O'Donnell é dedicada à construção de programas de modelos para melhorar a qualidade da educação.
Reações & taxas
Explore what makes a reaction happen by colliding atoms and molecules. Design experiments with different reactions, concentrations, and temperatures. When are reactions reversible? What affects the rate of a reaction?
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Recursos Educativos
Tópicos Principais
- Reacção
- Cinemática
- Concentração
- Equilíbrio
Amostra das Metas de Aprendizagem
- Explain why and how a pinball shooter can be used to help understand ideas about reactions.
- Describe on a microscopic level what contributes to a successful reaction (with illustrations).
- Describe how the reaction coordinate can be used to predict whether a reaction will proceed or slow.
- Use the potential energy diagram to determine: The activation energy for the forward and reverse reactions; The difference in energy between reactants and products; The relative potential energies of the molecules at different positions on a reaction coordinate.
- Draw a potential energy diagram from the energies of reactants and products and activation energy.
- Sketch how the number of reactants and products will change as a reaction proceeds.
- Explain how they know that a system has reached equilibrium from a graph of number of reactants and products versus time.
- Predict how raising or lowering the temperature will affect a system in the equilibrium position.
- Describe the relative sizes of the forward and reverse rates at equilibrium.
- Explain what effects whether the equilibrium position favors the products or the reactants.
- Predict how addition of a reactant or product will affect the forward and reverse reaction rates, and once this new system reaches equilibrium how the reactant and product concentrations will compare to the original system at equilibrium.
- Compare graphs of concentration vs. time to determine which represents the fastest or slowest rate.
Dicas para Professores
O guia para professores (pdf) contém dicas criadas pela equipa PhET.
Ideias para o Ensino
Você pode submeter as suas ideias e actividades.
Versões Traduzidas:
Requisitos de Software
| Windows | Macintosh | Linux |
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Microsoft Windows
XP/Vista/7 Sun Java 1.5.0_15 or later |
OS 10.5 or later
Sun Java 1.5.0_19 or later |
Sun Java 1.5.0_15 or later |
Créditos
| Equipa de Design | Bibliotecas de Terceiros | Agradecimentos Para |
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