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Do Now:. Explain this joke. The last 2 weeks we have….  investigated how evidence of chemical reactions indicates that new substances with different properties are formed. Evidence of a chemical reaction: (chemical change). Production of a gas (bubbling, fizzing or foaming)

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Do now

Do Now:

Explain this joke.


The last 2 weeks we have

The last 2 weeks we have…

 investigated how evidence of chemical reactions indicates that new substances with different properties are formed.


Evidence of a chemical reaction chemical change

Evidence of a chemical reaction: (chemical change)

  • Production of a gas (bubbling, fizzing or foaming)

  • A change in temperature or light (an energy change)

  • Appearance of a precipitate (solid material)

  • A change in color


Chemical reaction dehydration of sugar

Chemical Reaction Dehydration of sugar…


Let s make some visual models with skittles

Let’s make some visual models with SKITTLES

You will be able to…

8.5(D)  recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts;

8.5(F)  recognize whether a chemical equation containing coefficients is balanced or not and how that relates to the law of conservation of mass.

  • Key

  • Red-Chlorine

  • Orange-Sodium

  • Yellow-Oxygen

  • Green-Hydrogen

  • Purple- Carbon


  • Review how to make a molecule

    Review: How to make a molecule…

    Formula

    Visual model

    H2O

    Subscript

    No Subscript,

    There is only 1

    atom of oxygen in

    the molecule


    Review how to make a molecule1

    Review: How to make a molecule…

    Formula

    Visual model

    H2O

    No Subscript,

    There is only 1

    atom of oxygen in

    the molecule

    Subscript

    H2O2


    Review how to make a molecule2

    Review: How to make a molecule…

    Formula

    Visual model

    6 H2O

    Coefficient- How many molecules you have.


    H 2 o

    H2O

    1 molecule of H2O


    3 h 2 o

    3 H2O

    3 molecules of H2O


    Let s now model another chemical equation with our skittles

    Let’s now model another chemical equation with our SKITTLES…

    1 atom carbon reacts with 1 molecule of oxygen

    1 molecule of CO2

    1 carbon 2 oxygen

    1 carbon 2 oxygen


    Is it a balanced equation how do we know

    Is it a balanced equation? How do we know?

    1 molecule CO2

    1 atom carbon + 1 molecule oxygen

    1 carbon 2 oxygen

    1 carbon 2 oxygen


    Law of conservation of mass

    Law of Conservation of Mass

    Matter is not created or destroyed, it just changes forms.

    In a chemical reaction…


    More practice

    More practice…

    2 atoms carbon react with 2 molecule oxygen

    3 molecules CO2

    2 carbons 4 oxygen

    3 carbons 6 oxygens

    Is it balanced?


    Do now

    The model above is best represented by:

    • H2O

    • 2OH

    • HOOH

    • H2O2


    Do now

    The above model shows:

    • 10 atoms

    • 2 molecules

    • 2CH3Cl

    • All of the above


    6co 2 6h 2 0 sun s light c 6 h 12 o 6 6o 2

    6CO2+ 6H20+ Sun’s light C6H12O6+6O2

    The above reaction…

    • is photosynthesis

    • Is respiration

    • Transforms radiant energy into chemical energy

    • Both a and c.


    Organic molecules all contain

    Organic Molecules all contain…

    • Sulfur

    • Carbon

    • Oxygen

    • nitrogen


    All of the following are organic molecules except

    All of the following are organic molecules except…

    • C6H12O6

    • CH4

    • C6H6O

    • H20


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