Chang 2 Flashcards
What are ionic compounds made up of?
Cations (positive ions) and anions (negative ions)
With the important exception of the ammonium ion, NH4+.
What are binary compounds?
Compounds formed from just two elements
Many ionic compounds are binary compounds.
What are ternary compounds?
Compounds consisting of three elements
Ternary compounds are a number of other ionic substances.
Which type of metals can form more than one type of cation?
Transition metals
Certain metals, especially the transition metals, can form more than one type of cation.
Give an example of a metal that can form more than one cation.
Iron
Iron can form two cations: Fe2+ and Fe3+.
What system is used to designate different cations with Roman numerals?
The Stock system
This system is used because certain metals can form multiple types of cations.
Fill in the blank: All cations of interest to us are derived from _______.
Metal atoms
True or False: The ammonium ion is a cation derived from a metal atom.
False
The ammonium ion, NH4+, is the important exception among cations.
What are molecular compounds composed of?
Nonmetallic elements
Molecular compounds typically consist of discrete molecular units.
How do molecular compounds differ from ionic compounds?
Molecular compounds contain discrete molecular units, while ionic compounds do not.
Ionic compounds consist of ions held together by electrostatic forces.
An acid can be described as a substance that yields hydrogen
ions (H+) when dissolved in water.
Oxoacids are acids that contain hydrogen
oxygen
another element (the central element).
An acid can be described as a substance that yields hydrogen
