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Warm Up 5.4: Determine if a Chemical or Physical Change

Warm Up 5.4: Determine if a Chemical or Physical Change. P. C. C. P. C. P. P. C. P. Physical change effects…. Size Shape Color State of matter Additionally…. Reversible No energy. Chemical Change effects…. Composition Additionally… Energy involved New substance formed

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Warm Up 5.4: Determine if a Chemical or Physical Change

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  1. Warm Up 5.4: Determine if a Chemical or Physical Change P C C P C P P C P

  2. Physical change effects…. • Size • Shape • Color • State of matter Additionally…. • Reversible • No energy

  3. Chemical Change effects… • Composition Additionally… • Energy involved • New substance formed • Atoms rearranged

  4. Signs of Chemical Change • Color change • Energy: • Light • Heat • Fire • Electricity • Gas production: • Bubbles • Fizzing • Smoke • Odor change • Precipitate

  5. Basics Change into New one or more substances one or more substances Reactant Product

  6. Law of Conservation of Matter/Mass • Matter is not created nor destroyed • Just rearranged • Total mass of reactants = total mass of products

  7. Symbols used in equations After a chemical formula: (s) or ¯ : solid Cu(s) CaCo3¯ (g) or : gas H2 (g) O2 (l) : liquid H2O(l) (aq) : aqueous solution CaCl2 (aq) dissolved in H2O

  8. Other Symbols •  or heat :heat supplied to rxn • Chemical formula : catalyst

  9. All chemical rxns have…. a change in energy

  10. Ea: activation energy: Energy needed to start reactant collisions thus starting the rxn Activated Complex: “top of the hill” reactants’ atoms rearrange due to collisions. H: Enthalpy: change in heat: products – reactants

  11. Collision Theory( 1:17 min)

  12. Set up your paper

  13. “ Into”, absorb, heat added; heat needed Given off; heat produced; exit surroundings surroundings system system heat heat

  14. Reaction placement

  15. Activated complex Activated complex Ea Ea H=- heat given off Products Reactants H= + heat added Products Reactants

  16. Reactions Rates

  17. Catalyst • speeds up rxn w/o being used • Less activation energy is needed • Lowers the activated complex

  18. Other factors that effect rxn rate • Increase Temperature • Increase Pressure • Increase Concentration • amount of a substance per area • Bigger M = more concentration • Which will cause a faster reaction: 3M or 0.4M 3M will make the rxn faster

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