Section 3 3 stoichiometry and chemical reactions
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Section 3.3 Stoichiometry and Chemical Reactions PowerPoint PPT Presentation


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Section 3.3 Stoichiometry and Chemical Reactions. In this section: a. Chemical reactions and equations b. Balancing equations c. Reaction stoichiometry. Chemical reactions and equations Reactants Products. CH 3 CHCH 2 + HCl. CH 3 CHClCH 3.

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Section 3.3 Stoichiometry and Chemical Reactions

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Section 3 3 stoichiometry and chemical reactions

Section 3.3Stoichiometry and Chemical Reactions


In this section a chemical reactions and equations b balancing equations c reaction stoichiometry

In this section:a. Chemical reactions and equationsb. Balancing equationsc. Reaction stoichiometry


Chemical reactions and equations reactants products

Chemical reactions and equations Reactants Products

CH3CHCH2 + HCl

CH3CHClCH3


Chemical equation before and after mechanism how you get there

Chemical equation: before and afterMechanism: how you get there

Step 1.

Step 2.


The most important thing it s the same atoms reactants products

The most important thing: It’s the same atoms Reactants Products

CH3CHCH2 + HCl

CH3CHClCH3


The law of conservation of matter it s the same atoms stoichiometric coefficients

CH3CHCH2 + HCl

CH3CHClCH3

The Law of Conservation of MatterIt’s the same atomsStoichiometric Coefficients:

C2H2 + 2 H2

CH3CH3


Section 3 3 stoichiometry and chemical reactions

Balancing Chemical EquationsGoal: same number of atoms of each element on both sidesRule: you can change stoichiometry coefficients,not the molecular formulas

CH4 + O2

CO2+ H2O


A bit harder

Another Example:

Mg + O2MgO

A bit harder

C4H10 + O2

CO2+ H2O


Big misconception stoichiometric coefficients are not how much reacts forms

CH4 + 2 O2

CO2+ 2 H2O

Big misconception: stoichiometric coefficients are NOT how much reacts/forms


Balancing equation mol to mol conversion factor

CH4 + 2 O2

CO2+ 2 H2O

Balancing Equation = mol to mol conversion factor


Amounts tables if 0 46 mol o 2 react how much co 2 and h 2 o are formed and how much ch 4 reacts

CH4 + 2 O2

CO2+ 2 H2O

Amounts tables: If 0.46 mol O2 react, how much CO2 and H2O are formed, and how much CH4 reacts?

change:


Section 3 3 stoichiometry and chemical reactions

Real experiments use mass, not moles.gram gram conversionsPath: grams A moles A moles B grams B


Section 3 3 stoichiometry and chemical reactions

25.0 g of O2 react. What mass of CH4 reacts and what masses

of CO2 and H2O are formed?

CH4 + 2 O2

CO2+ 2 H2O


Section 3 3 stoichiometry and chemical reactions

25.0 g of O2 react. What mass of CH4 reacts and what masses

of CO2 and H2O are formed?

CH4 + 2 O2

CO2+ 2 H2O


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