![]() ![]() Once the idea that the number and types of atoms before and after a reaction must remain constant, it can then be established that the mass before and after the reaction also must be constant. In other words, the number and type of atoms in the reactants and in the products must be made equal because matter can be neither created nor destroyed. It will be helpful to make explicit the connection between balanced equations and the Law of Conservation of Mass. This resource appears to be designed to build towards this performance expectation, though the resource developer has not explicitly stated so.Ĭomments about Including the Performance Expectationīalanced equations are a symbolic representation of the ratios in which atoms and molecules actually interact. After completing three introductory equations, the user can choose to play a game with varying levels of difficulty to reinforce the concepts. Alternatively, they can view a scale for each type of atom present that balances once the same number of each is reached on the reactant and product sides. In the introductory section, users can access a tool box in order to view a bar chart of each type of atom present in the reactants and products to reinforce the idea of what a balanced equation means. Once the equation is balanced, a big smiley face appears to indicate that the same number and type of atoms are present in the reactants and the products. They can count the number and kind of each atom and how a change in the coefficient changes the count of each atom. This allows the users to visualize what the symbols in the chemical equation actually mean. ![]() In this interactive simulation, users adjust the coefficients in an equation while the molecules are depicted in a box above the equation. ![]()
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