Review Topics Flashcards
1
Q
ionic compounds
A
- often metal and non-metal
- crystalline solids (made of ions)
- high melting and boiling points
- conduct electricity when melted
- many soluble in water but not in nonpolar liquid
2
Q
covalent compounds
A
- often nonmetal and nonmetal
- gases, liquid, or solids (made of molecules)
- low melting and boiling point
- poor electrical conductors in a phases
- many soluble in nonpolar liquids but not in water
3
Q
most main-group elements form ___________
A
one monatomic ion
4
Q
group 1A 2A 3A 5A 6A 7A
A
ion charge \+1 \+2 \+3 -3 -2 -1
5
Q
isotopes have
A
different numbers of neutron
6
Q
all atoms of an element have the ______ number of protons
A
same
7
Q
mass number is composed of
A
protons and neutrons
8
Q
atomic number is composed of
A
protons
9
Q
mass number is on the ______ for atomic symbols
A
top
10
Q
atomic number is on the _______ for atomic symbols
A
bottom
11
Q
unit of molecular mass:
A
“amu”=atomic mass units
12
Q
avogardo’s number
A
1 mole of things = 6.022x10^23 things
“things” can be atoms, molecules, or apples
13
Q
molarity
A
number of moles/volume in liters
