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Chemistry 1405
Chapter 10
Vocabulary Assignment: Quantity Relationships in Chemical Reactions
1. Stoichiometry - the quantitative relationships among the substances involved in a
chemical reaction, established by the equation for the reaction.
2. Give an example of a balanced equation to show how to obtain conversion
factors -
3. Write a stepwise mass to mass conversion for calculating mass of desired or
wanted chemical given the mass of one chemical the balanced chemical
equation -
4. What is the theoretical yield and how is it calculated? -
5. What is the actual or experimental yield? - the measured yield of a product of a
chemical change, determined by experiment or experience.
6. Write the formula for the percent yield why is this number important?-
percentage yield= actual yield/ theoretical yield x 100. The difference between the
actual yield and the theoretical yield of a chemical reaction expressed as a percentage.
7. Limiting reactant - the reactant first totally consumed in a reaction, thereby
determining the maximum yield possible.
8. Use the comparison of calculated mass method to determine limiting
reactant-
9. Excess reactant - the reactant(s) in a chemical reaction that remain when the
reaction is complete
10. energy -
11. Joule - the SI energy unit, defined as a source of one Newtown applied over a
distance of one meter; 1 J= 1kg x m^2/s^2; 1 joule= 0.239 calorie
12. Calorie a unit of heat energy equal to 4.184 joules
13. Enthalpy of reactions and its relationship to exothermic and endothermic
reactions-
14. Write a stepwise mass to energy conversion using a thermochemical
equation to calculate energy of a reaction -
