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# Stoichiometry - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Stoichiometry' - muncel

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### Stoichiometry

ICS III

Week 6

• 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 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

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).

• 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

• 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

+

+

+

Frame + 2 wheels + handlebar + 2 pedals bicycle

F + 2W + H + 2P --- FW2HP2

Product

Reactants

• 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

• 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

• 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?

• 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

Moles of wanted compound

Moles of given compound

• The coefficient goes in front

What is given

Convert from moles to grams

MOLE RATIO

Convert from grams to moles

What is wanted

• 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

(given quantity) (wanted quantity)

(given quantity) (wanted quantity)

(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