Chem 162 Exam one 2025 Questions and
Verified Answers
What is the driving force for chemical reactions to occur in aqueous solutions?
Energy
-The system works to lower its overall energy
Three kinds of chemical reactions that occur in solution:
-Acid-base (neutralization) reactions
-Double displacement (Metathesis) reactions
-Oxidation-Reduction (Redox) reactions
What is a molecular equation?
A chemical equation in which the substances are written as if they were molecular
substances, even though they may actually exist in solution as ions.
What is a total ionic equation?
A chemical equation for a reaction involving ions in solution in which soluble substances
are represented by the formulas of the predominant species in solution.
What is a net ionic equation?
An ionic equation from which spectator ions have been eliminated
, Acid
H+ donor
Base
H+ acceptor
Weak acids are also weak _____________________.
1. electrolytes
Precipitation Reaction
A subset of class called double displacement (or metathesis) reactions
Double Displacement Reaction
Consists of the apparent exchange of ions between two compounds
Oxidation-Reduction Reactions
Involve the transfer of electrons from one species to another
Oxidation
Loss of electrons
Reduction
Gain of electrons
What is the purpose of oxidation numbers?
They provide an accounting system to keep track of electrons in redox reactions
Oxidation Number
The oxidation number of an atom in a substance is the actual charge of the atom if it exists as
a monatomic ion or a hypothetical charge assigned to the atom using certain rules.
Rules for assigning oxidation numbers: Elements
Verified Answers
What is the driving force for chemical reactions to occur in aqueous solutions?
Energy
-The system works to lower its overall energy
Three kinds of chemical reactions that occur in solution:
-Acid-base (neutralization) reactions
-Double displacement (Metathesis) reactions
-Oxidation-Reduction (Redox) reactions
What is a molecular equation?
A chemical equation in which the substances are written as if they were molecular
substances, even though they may actually exist in solution as ions.
What is a total ionic equation?
A chemical equation for a reaction involving ions in solution in which soluble substances
are represented by the formulas of the predominant species in solution.
What is a net ionic equation?
An ionic equation from which spectator ions have been eliminated
, Acid
H+ donor
Base
H+ acceptor
Weak acids are also weak _____________________.
1. electrolytes
Precipitation Reaction
A subset of class called double displacement (or metathesis) reactions
Double Displacement Reaction
Consists of the apparent exchange of ions between two compounds
Oxidation-Reduction Reactions
Involve the transfer of electrons from one species to another
Oxidation
Loss of electrons
Reduction
Gain of electrons
What is the purpose of oxidation numbers?
They provide an accounting system to keep track of electrons in redox reactions
Oxidation Number
The oxidation number of an atom in a substance is the actual charge of the atom if it exists as
a monatomic ion or a hypothetical charge assigned to the atom using certain rules.
Rules for assigning oxidation numbers: Elements
