Chemical Changes and Balancing
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Summary
These notes cover chemical changes, including physical and phase changes, chemical changes, reaction mechanisms, evidence of chemical changes, and Avogadro's number. They also include information on writing chemical equations.
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Chemical changes Physical or phase changes One in which the chemical composition does not change No new chemicals are formed Chemical changes New substances with different properties are formed Chemical changes Nuclear changes Eleme...
Chemical changes Physical or phase changes One in which the chemical composition does not change No new chemicals are formed Chemical changes New substances with different properties are formed Chemical changes Nuclear changes Elements are changed into different element Fission/fusion Why do reaction occurs? Kinetic molecular theory Smallest particles of matter are always in random motion Result in collisions among the particles These collisions may lead to particle rearranging to form new particles Evidence for chemical change Colour change Odour change Precipitate forms Energy changes Endo/exothermic Avogadro's # Determines # of particles(molecule) present Molecules is not the same as moles 6.02x1023 molecules in 1 mole of any substance 6.02x1023 molecule/mol When question asks for particles or molecules use this conversion Writing Chemical Equations Chemical Equation- 1. Need to know reactants & products 2. Must include correct elements 3. Charges must be balanced 4. Equal # number of elements on both reactant & product sides 5. Must have states for each compound Writing chemical equations Writing chemical equations
