Ions
Magnessium bromide is an ionic compound with the chemical formula AlCl3 What does the 3 tell you?
there are three chlorine ions for every aluminum ion
A combination of symbols that show the ratio of elements in a compound
chemical formula
In what state of matter do ions conduct electricity?
liquid or aqueous (dissolved). The ions in solid crystals are tightly packed and cannot move. If the ions cannot move there is no current.
A molecular compound is
a compound that is composed of molecules (covalent bonds)
what is a molecule
two or more atoms joined by covalent bonds
When an atom loses an electron it becomes a_______
positive ion (cation)
What is the chemical name of CaF2
Calcium Fluoride
The attraction of a positive and negative ion results in a(n)___________________________
ionic bond
When electrons are ___________________between two atoms, a covalent bond is formed
shared
What is the chemical formula for hydrogen hydroxide
H2O or HOH
An ionic bond is__________
the attraction of oppositely charged ions
Name this compound Na2CO3
Sodium Carbonate
Identify the property of Ionic bonds: 1)They have low melting points 2)They have low boiling points 3)The form hard, brittle crystals with characteristics shape 4)They contain no charged ions
3 -- they form hard, brittle crystals with characteristic shape
what is a non-polar bond
What is a covalent bond in which electrons are equally shared
A chemical bond that is formed when two atoms share electrons is called
covalent bond
Ions that are made of more then one atom are examples of _______
polyatomic ions
When ions having a positive charge form bonds with ions having a negative charge, the charge on the resulting compound is
Neutral or Zero
Ionic compounds are electrically ___________
neutral
What are the seven diatomic elements?
Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
What is a double bond?
two pairs of electrons that are shared between two atoms
When an atom gains an electron it becomes a
negative ion (anion)
Hydroxide(OH-) and Cyanide(CN-) are examples of _______
polyatomic ions
What are the three properties of Ionic bonds?
1)Ionic crystals 2)High Melting Points 3)Electrical Conductivity
trisulfur heptaiodide
A covalent bond in which electrons are shared unequally is called
Polar