1 / 18

Stoichiometry

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

muncel
Download Presentation

Stoichiometry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stoichiometry ICS III Week 6

  2. 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)

  3. 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

  4. 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).

  5. 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

  6. 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

  7. Making a Bicycle + + + Frame + 2 wheels + handlebar + 2 pedals bicycle F + 2W + H + 2P --- FW2HP2 Product Reactants

  8. 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

  9. 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

  10. 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?

  11. 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

  12. Mole Ratio Moles of wanted compound Moles of given compound • The coefficient goes in front

  13. How Stoichiometry Works What is given Convert from moles to grams MOLE RATIO Convert from grams to moles What is wanted

  14. 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

  15. aG bW (given quantity) (wanted quantity)

  16. aG bW (given quantity) (wanted quantity)

  17. aG bW (given quantity) (wanted quantity)

  18. 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

More Related