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7 Cards in this Set

  • Front
  • Back
Mendeleev's periodic law
When the elements are arranged in order of increasing atomic number, certain sets of properties recur periodically
stoichiometry.
The study of the numerical relationship between
chemical quantities in a chemical reaction
Limiting reactant
the reactant that is completely consumed in a chemical reaction
Theoretical yield
the amount of product that can be made in a chemical reaction based on the amount of limiting reactant
actual yield
the amount of product actually produced by a chemical reaction
exothermic reactions
the sign of the enthalpy change is negative when:

– Thermal energy is produced by the reaction.

– The surroundings get hotter.

– Ex: For the reaction CH4(s) + 2 O2(g) → CO2(g) + 2
H2O(l), the ΔHrxn = −802.3 kJ per mol of CH4.
endothermic reactions
the sign of the enthalpy change is positive when:

– Thermal energy is absorbed by the reaction.

– The surroundings get colder.

– Ex: For the reaction N2(s) + O2(g) → 2 NO(g), the
ΔHrxn = +182.6 kJ per mol of N2.