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WHAT IS STOICHIOMETRY?. INTERPRETING BALANCED CHEMICAL EQUATIONS STOICHIOMETRY IS THE STUDY OF THE QUANTITATIVE, OR MEASURABLE, RELATIONSHIPS THAT EXIST.

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Presentation on theme: "WHAT IS STOICHIOMETRY?. INTERPRETING BALANCED CHEMICAL EQUATIONS STOICHIOMETRY IS THE STUDY OF THE QUANTITATIVE, OR MEASURABLE, RELATIONSHIPS THAT EXIST."— Presentation transcript:

1 WHAT IS STOICHIOMETRY?

2 INTERPRETING BALANCED CHEMICAL EQUATIONS STOICHIOMETRY IS THE STUDY OF THE QUANTITATIVE, OR MEASURABLE, RELATIONSHIPS THAT EXIST IN CHEMICAL FORMULAS AND CHEMICAL REACTIONS. N 2 H H 2 O 2 -> N H 2 O The coefficients can indicate the following: 1 molecule N 2 H molecules H 2 O 2 -> 1 molecule N molecules H 2 O 1 mole N 2 H moles H 2 O 2 -> 1 mole N moles H 2 O 32 g N 2 H 4 + 2(34 g) H 2 O 2 -> 28 g N (18 g) H 2 O

3 HOW DO WE CALCULATE THE AMOUNT OF PRODUCT?

4 WHAT IS A LIMITING REACTANT? The reactant that limits the amount of product formed The reactant that in an experiment is all used up

5 Measures the efficiency of a reaction carried out in the lab Theoretical yield – the maximum amount of product that can form during a reaction (calculated) Actual yield – how much actually forms Factors causing % yield to be less than 100 Reaction not completing Impure reactants Loss of product during filtration Careless measurement Percent Yield

6 HOW DO WE DETERMINE PERCENT YIELD? Although you can determine the amount of product that will be produced in a chemical reaction, in reality, that calculated amount is not always the actual amount obtained from the reaction.

7 Shows the amount of heat produced or absorbed by a reaction Every reactant will have a certain heat content, or enthalpy (H) The change in enthalpy ( H) will tell us if the reaction is exo or endothermic Thermochemical Equation

8 If H is positive, reaction is endothermic (heat is a reactant) If H is negative, reaction is exothermic (heat is a product) Change in Enthalpy


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