CHEM 116 LAB FINAL EXAM QUESTIONS AND COMPLETE
ANSWERS A+ RATED
oxidation number of a free element (ex. He, N2) - ANSWER always zero
oxidation of a monatomic ion - ANSWER equals the charge of the ion (ex. Na+ oxidation
number is +1)
monatomic ion - ANSWER ion consisting of a single atom
oxidation number of H - ANSWER is +1 or -1
oxidation number of O - ANSWER is +2
sum of oxidation numbers of all atoms in neutral compounds equal - ANSWER zero
What is the oxidation number of S in Na2SO4? - ANSWER +6
what is the oxidation number of C in K2C2O4? - ANSWER +3
the study for how fast a rxn takes place - ANSWER chemical kinetics
, what changes can increase the rate of the formation of gaseous hydrogen in the general rxn:
M(s) + 2H+(aq) --> M2+(aq) + H2(aq) - ANSWER 1) replace large piece of metal with metal
dust
2) increase temp
3) add catalyst
How is surface area related to the size of the metal pieces? - ANSWER -small pieces of metal
have high surfaces areas
-large pieces of metals have low surface areas
the weaker the acid, the more_________the reaction rate. - ANSWER decreased
the ________ the acid, the more increased the reaction rate. - ANSWER stronger
The higher the molarity, the more __________the reaction rate. - ANSWER increased
the _______ the molarity, the more decreased the reaction rate. - ANSWER lower
what is an amphoterism? - ANSWER insoluble metal hydroxides that exhibit both acidic and
basic properties
ANSWERS A+ RATED
oxidation number of a free element (ex. He, N2) - ANSWER always zero
oxidation of a monatomic ion - ANSWER equals the charge of the ion (ex. Na+ oxidation
number is +1)
monatomic ion - ANSWER ion consisting of a single atom
oxidation number of H - ANSWER is +1 or -1
oxidation number of O - ANSWER is +2
sum of oxidation numbers of all atoms in neutral compounds equal - ANSWER zero
What is the oxidation number of S in Na2SO4? - ANSWER +6
what is the oxidation number of C in K2C2O4? - ANSWER +3
the study for how fast a rxn takes place - ANSWER chemical kinetics
, what changes can increase the rate of the formation of gaseous hydrogen in the general rxn:
M(s) + 2H+(aq) --> M2+(aq) + H2(aq) - ANSWER 1) replace large piece of metal with metal
dust
2) increase temp
3) add catalyst
How is surface area related to the size of the metal pieces? - ANSWER -small pieces of metal
have high surfaces areas
-large pieces of metals have low surface areas
the weaker the acid, the more_________the reaction rate. - ANSWER decreased
the ________ the acid, the more increased the reaction rate. - ANSWER stronger
The higher the molarity, the more __________the reaction rate. - ANSWER increased
the _______ the molarity, the more decreased the reaction rate. - ANSWER lower
what is an amphoterism? - ANSWER insoluble metal hydroxides that exhibit both acidic and
basic properties
