04 Notes - Balancing Equations

04 Notes - Balancing Equations - Pluchino Regents Chemistry...

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Pluchino – Regents Chemistry Atoms, Formuals & Reactions – 04 Balancing Equations Aim: How do you balance chemical equations? Do Now: What information can we get from the chemical equation below? 2H 2 (g) + O 2 (g) 2H 2 O (l) + 572 kJ Chemical Equations 2H 2 (g) + O 2 (g) 2H 2 O (l) + 572 kJ Type of substances that are reacting Type of substances that results If reaction requires or creates energy The state of matter of each substance How much starting material is needed How much ending product is produced Reactants: materials that enter a reaction. Products: materials that exit a reaction Energy: can be required or produced Why do chemical reactions occur? 1. The products have a lower energy than the reactants (enthalpy). 2. The products are more disordered than the reactants (entropy). Both of these lead to an overall decrease in energy of the system – this is a favorable change.
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04 Notes - Balancing Equations - Pluchino Regents Chemistry...

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