This video provides a basic introduction to prokaryotic cells. Topics discussed include: characteristics of bacteria, outer covering, bacterial shapes, key parts of bacterial cells, importance of bacteria and endosymbiotic theory.
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HS-PS1-1: Use the periodic table as a model to predict the relative properties of elements based on patterns of electrons in the outermost energy levels of atoms. This video gives a quick summary of how to determine the number of valence electrons in the representative elements. These are the elements found in the two left-most columns (below H and Be) and the six right most columns (below B, C, N, O, F and He). Many properties of the elements can be predicted once you know how many valence electrons an atom possesses. Elements in the same vertical column (H, Li, Na, K...) will have the same number of valence electrons which means that they will have similar chemical properties. One exception to this pattern is found in the Noble gases. Helium has only two valence electrons while the other Noble gases contain eight.
PhET is a collection of free simulations covering topics including; math, physics, chemistry biology and earth science. Many of the sims have been converted to HTML5, which means they are BYOD friendly because they will run on iPADs, Chromebooks and phones.
The sims can be run directly from the PhET site or embedded into your own website. The sim below was one that I used as one in a sequence of lessons covering the topic of orbiting objects. Students can choose a number of systems to analyze. The possibilities include; Sun/Earth, Sun/Earth/Moon, Earth/Moon, Earth/Satellite. HS-PS1-7: Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction. PS1-7 Evidence Statements The video below discusses the decomposition reaction of hydrogen peroxide and uses a balanced chemical equation and structural formulas to explain why the number of atoms is conserved in a chemical reaction. The video below discusses another example of a chemical reaction and discusses a strategy for writing a balanced equation. |
Noel PaullerThank for visiting my blog where I post thoughts from the random corner of the universe which is my brain. Archives
October 2022
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