## Ch. 8: Quantities in Chemical Reactions

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Danny626  on February 29, 2012

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# Ch. 8: Quantities in Chemical Reactions

 stoichiometry [stoi-kee-om-i-tree]The numerical relationship between chemical quantities of reactants and products in a balanced chemical equation. These chemical calculations are central to chemistry.
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#### Definitions

stoichiometry [stoi-kee-om-i-tree] The numerical relationship between chemical quantities of reactants and products in a balanced chemical equation. These chemical calculations are central to chemistry.
percent yield actual yield / theoretical yield = _______ _____
actual yield The amount of product actually formed by a chemical reaction. (______ _____)
theoretical yield The amount of product predicted from a chemical reaction based on the limiting reactant.
limiting reactant the substance that controls the quantity of product that can form in a chemical reaction (________ ________)
energy ______ is the capacity to do work, or supply heat. [ ] = Work + Heat
thermal energy _______ ______ is kinetic energy of molecular motion (translation, rotation, vibration).
potential; kinetic _________ energy is stored energy (chemical) and _______ energy is energy of motion.
heat Amount of thermal energy transferred between 2 objects at different temperatures.
4.18 1 cal = ___ J
1000 1 kcal = ____ cal
1000 1 C = ____ cal (nutritional calorie)
gram Fuel/caloric value: amount of energy per ____ of food.
enthalpy change ________ _______ is indicated by the symbol, ΔHreaction or ΔH° = ΔHp - ΔHr
mcΔT q =
q _ is the amount of heat needed to change the temperature of a substance
m _ is the mass of the heated substance
c _ is the specific heat capacity (if this is what you're looking for, then the equation should be Q / mΔT = [ ])
ΔT __ is the temperature difference; the difference in temperature before and after you applied the heat
endothermic heat flows into the system, ΔH is positive (ΔH = 22 kcal)
exothermic heat flows out of the system, ΔH is negative (ΔH = -213 kcal)
specific heat capacity Amount of heat required by 1 g of a substance to increase its temperature by 1°C. (J / g°C) ________ ____ ________

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