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Chemical Reactions. Topic 7. Chemical Reaction happen all around us – even inside of us!. Chemical Reaction about t o take p lace…. Chemical Reactions. Chemical Reactions (  must know!) Two or more substances undergo a reorganization of atoms to form other substances.

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chemical reaction happen all around us even inside of us
Chemical Reaction happen all around us – even inside of us!

Chemical Reaction about to

take place…

chemical reactions1
Chemical Reactions
  • Chemical Reactions (must know!)
    • Two or more substances undergo a reorganization of atoms to form other substances.
  • Reactants (must know!)
    • The substances that go into a chemical reaction
  • Products (must know!)
    • The substances that are produced from a chemical reaction

Reactant + Reactant  Products

chemical reactions2
Chemical Reactions
  • When iodine is placed on a potato - a chemical reaction occurs and a blue-black colour is left.
    • Colour change indicates a chemical reaction
  • When two solutions are put together – they may form a precipitate (solid)
    • A precipitate and/or gas forming indicates a chemical reaction
    • Example: Silver Nitrate with Sodium Hydroxide
    • Click here  http://www.youtube.com/watch?v=SuoN0hQPeMw
chemical reactions3
Chemical Reactions
  • When charcoal is burned, a chemical reaction occurs.
    • Heat and light production indicates a chemical reaction
  • When food spoils, its odour may change.
    • Odour change can indicate a chemical reaction
writing out chemical reactions
Writing out Chemical Reactions
  • Writing out word equations
  • Writing out chemical equations
baking soda and vinegar
Baking Soda and Vinegar!
  • We know Baking soda and vinegar go through a chemical reaction.
  • Word Equation

Baking soda + Vinegar 

Sodium acetate + water + carbon dioxide

  • Chemical Equation
try it out
Try it out

Situation: Burning Methane

Word Equation

Methane + Oxygen  Carbon Dioxide + Water

Chemical Equation

CH4(g) + O2(g) CO2(g) + H20(g)

energy in chemical bonds
Energy in Chemical Bonds

Energy is stored in chemical bonds

To break bonds – energy is required

To form bonds – energy is released

exothermic and endothermic
Exothermic and Endothermic

Even though many reactions take and release energy, we look at whether it takes more or loses more.

Exothermic – Heatexits the chemical reaction

Endothermic – Heatenters the chemical reaction

example
Example
  • Burning gas in the car
  • Word equation
    • Propane + oxygen  carbon dioxide + water
  • Chemical equation
    • C3H8(g) + O2(g)  CO2(g) + H2O(g) + energy (heat!)
  • Even though you need to put a little energy in to start the chemical reaction, the heat produced is enough to keep the reaction going and more.
do you recognize this reaction
Do You Recognize This Reaction?

Photosynthesis is a chemical reaction.

Is it exothermic or endothermic?

do you recognize this reaction1
Do You Recognize This Reaction?
  • Endothermic:
    • Why? Energy ENters the reaction
    • When you eat sugars and starches, you are eating molecules formed by endothermic reactions. Your cells break down these molecules in an exothermic process that supplies the body with energy. This exothermic process is called cellular respiration.
hot and cold packs
Hot and Cold Packs

Both hot and cold packs go through chemical reactions

Which goes through an endothermic reaction?

Which goes through an exothermic reaction?

hot and cold packs1
Hot and Cold Packs

Both hot and cold packs go through chemical reactions

Which goes through an endothermic reaction? Cold Packs

Which goes through an exothermic reaction? Hot packs

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