Chemical changes
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Chemical Changes. What are chemical changes?. All have 2 parts. All have 2 parts Reactants- the substances you start with. All have 2 parts Reactants- the substances you start with Products- the substances you end up with. All have 2 parts Reactants- the substances you start with

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What are chemical changes
What are chemical changes?

  • All have 2 parts



  • All have 2 parts

    • Reactants- the substances you start with

    • Products- the substances you end up with


  • All have 2 parts

    • Reactants- the substances you start with

    • Products- the substances you end up with

  • Reactants turn into the products


  • All have 2 parts

    • Reactants- the substances you start with

    • Products- the substances you end up with

  • Reactants turn into the products

  • Matter is not ________or_________


  • All have 2 parts

    • Reactants- the substances you start with

    • Products- the substances you end up with

  • Reactants turn into the products

  • Matter is not created or_________


  • All have 2 parts

    • Reactants- the substances you start with

    • Products- the substances you end up with

  • Reactants turn into the products

  • Matter is not created or destroyed


Evidence of chemical reactions
Evidence of Chemical Reactions

  • Just because the evidence is there does NOT mean that it is a chemical reaction


Evidence
Evidence

  • Formation of Gas


Evidence1
Evidence

  • Formation of Gas

    Observations:


Evidence2
Evidence

  • Formation of Gas

    Observations:

    • Bubbles

    • Smoke

    • Odor/Fumes


Evidence3
Evidence

  • Formation of Gas

    Observations:

    • Bubbles

    • Smoke

    • Odor/Fumes

      Example: The Solvay Process (0:31)


Evidence4
Evidence

  • Change in Color


Evidence5
Evidence

  • Change in Color

    Observations:


Evidence6
Evidence

  • Change in Color

    Observations:

    • Be careful…some changes in color are physical changes!


Evidence7
Evidence

  • Change in Color

    Observations:

    • Be careful…some changes in color are physical changes!

      Example: Bromine and Alcohol (1:00)


Evidence8
Evidence

  • Formation of a Solid (Precipitate)


Evidence9
Evidence

  • Formation of a Solid (Precipitate)

    Observations:


Evidence10
Evidence

  • Formation of a Solid (Precipitate)

    Observations:

    • Cloudy

    • Foggy

    • Solid at bottom


Evidence11
Evidence

  • Formation of a Solid (Precipitate)

    Observations:

    • Cloudy

    • Foggy

    • Solid at bottom

      Example: Precipitate Reaction (0:25)


Evidence12
Evidence

  • Change in Heat or Light Energy


Evidence13
Evidence

  • Change in Heat or Light Energy

    • Observations:


Evidence14
Evidence

  • Change in Heat or Light Energy

    • Observations:

      • Gets warm/ hot/ cold

      • Spark or explosion

      • Glow


Evidence15
Evidence

  • Change in Heat or Light Energy

    • Observations:

      • Gets warm/ hot/ cold

      • Spark or explosion

      • Glow

  • Example: Glow Sticks (3:00)


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