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Stoichiometry. ICS III Week 6. Baking Recipe. Ingredients 1 cup unsalted butter (B) 1 cup sugar (S) 1 cup brown sugar (Bs) 2 large eggs (E) 1 teaspoon pure vanilla extract (V) 3 cups flour (F) 1 teaspoon salt (Na) 2 cups chocolate chips (Cc) Bake for 30 minutes @ 375 degrees O F

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Stoichiometry

Stoichiometry

ICS III

Week 6


Baking recipe
Baking Recipe

  • Ingredients

    • 1 cup unsalted butter (B)

    • 1 cup sugar (S)

    • 1 cup brown sugar (Bs)

    • 2 large eggs (E)

    • 1 teaspoon pure vanilla extract (V)

    • 3 cups flour (F)

    • 1 teaspoon salt (Na)

    • 2 cups chocolate chips (Cc)

    • Bake for 30 minutes @ 375 degrees OF

  • Makes up to 50 cookies (Co)


Chemical reactions
Chemical Reactions

  • Chemical reaction

    • When bonds are broken and rearranged to form a new substance

    • Reactant(s)

      • A substance present at the start of a reaction

      • You can have 1 reactant or 1,000 reactants

    • Product(s)

      • Substance produced in a chemical reaction

      • You can have 1 product or 1,000 products


Yields

REACTANT 1 + REACTANT 2

PRODUCT 1 + PRODUCT 2

  • Chemical Equation

    • A representation of a chemical reaction

      • The formulas of the reactants (on the left) are connected by an arrow with the formulas of the product (on the right).


Baking recipe1
Baking Recipe

  • Ingredients

    • 1 cup unsalted butter (B)

    • 1 cup sugar (S)

    • 1 cup brown sugar (Bs)

    • 2 large eggs (E)

    • 1 teaspoon pure vanilla extract (V)

    • 3 cups flour (F)

    • 1 teaspoon salt (Na)

    • 2 cups chocolate chips (Cc)

    • Bake for 30 minutes @ 375 degrees OF

  • Makes up to 50 cookies (Co)

Letters are symbols that indicate a specific compound. B = butter

Reactants

Product


Chemical reaction for baking chocolate chip cookies
Chemical Reaction for Baking Chocolate Chip Cookies

  • 1 cup unsalted butter (B)

  • 1 cup sugar (S)

  • 1 cup brown sugar (Bs)

  • 2 large eggs (E)

  • 1 teaspoon pure vanilla extract (V)

  • 3 cups flour (F)

  • 1 teaspoon salt (Na)

  • 2 cups chocolate chips (Cc)

  • Bake for 30 minutes @ 375 degrees OF

  • Makes up to 50 cookies (Co)

  • When ever you don’t put a number, it automatically indicates only 1 compound

    • B + S + Bs + E + V + F + Na + Cc  Co

    • B + S + Bs + 2E + V + 3F + Na + 2Cc  50Co

    • Coefficient

      • A number that represents how many compounds are present in a reaction


    Making a bicycle
    Making a Bicycle

    +

    +

    +

    Frame + 2 wheels + handlebar + 2 pedals bicycle

    F + 2W + H + 2P --- FW2HP2

    Product

    Reactants


    Conservation of mass
    Conservation of Mass

    • In a chemical reaction mass and atoms are conserved in every chemical reaction.

      • What ever is on the left must equal what is on the right.

      • __ grams + 40 g = 77 g

      • 37 grams


    Stoichiometry1
    Stoichiometry

    • Stoichiometry

      • Calculation of quantities in chemical reactions

      • Allows chemists to tally the amounts of reactants and products using ratios of moles or representative particles.

    • Mole Ratio

      • Conversion factor derived from the coefficients of balanced chemical equations interpreted in terms of moles


    How stoichiometry works
    How Stoichiometry Works

    • If you react 20 grams of sodium hydroxide with an excess of hydrochloric acid, how much water would result?

      • You always want to work with moles!

      • Go through the steps

        • What is given

        • What are you looking for?

        • How do we get there?


    How stoichiometry works1
    How Stoichiometry Works

    • What is given?

      • 20 grams NaOH

    • What are we looking for?

      • Grams water (H2O)

    • How do we get there??

      • Convert to moles

      • Mole ratio

      • Convert to grams


    Mole ratio
    Mole Ratio

    Moles of wanted compound

    Moles of given compound

    • The coefficient goes in front


    How stoichiometry works2
    How Stoichiometry Works

    What is given

    Convert from moles to grams

    MOLE RATIO

    Convert from grams to moles

    What is wanted


    How stoichiometry works3
    How Stoichiometry Works

    • In this reaction, how many grams of Fe2O3 are required to completely react with 84 grams of CO?

    What is given

    Convert from moles to grams

    MOLE RATIO

    Convert from grams to moles

    What is wanted


    aG bW

    (given quantity) (wanted quantity)


    aG bW

    (given quantity) (wanted quantity)


    aG bW

    (given quantity) (wanted quantity)


    CH4 + 2O2 CO2 + 2H2O

    • The Equation above shows the reaction of methane (CH4) burning in the presence of oxygen. If 32 grams of methane react completely with oxygen, how many grams of carbon dioxide (CO2) will be formed?

    • 32 g

    • 44 g

    • 56 g

    • 88g


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