Show:
Basic Math
Lewis Structures
and Electron Configurations
Molar Masses
and Conversions
Balancing Reactions
Ionic and Covalent Compounds
100
40 - (83 + 70)
- 113
100
How many electrons does hydrogen want to have in Lewis structures?
Two electrons
100
What are the standard units for molar mass?
g/mol (or grams per mole)
100
___ C + ___ O2 -> ___ CO
2 C + 1 O2 -> 2 CO
100
What is the chemical formula for dinitrogen monoxide?
N2O
200
6 x 20 x 3.5
420
200
Which elements are allowed to exceed the octet rule?
All elements in the third row or below.
200
What is the molar mass of HF? (Molar masses: H = 1, F = 19)
20
200
___ NH3 -> ___ N2 + ___ H2
2 NH3 -> N2 + 3 H2
200
What is the name of MgSO4?
Magnesium sulfate
300
sqrt(0.0004) x 30
0.6
300
Provide the full electron configuration for the Cl(2+) ion.
(1s2) (2s2) (2p6) (3s2) (3p3)
300
What is the molar mass of Na2CO3? (Molar masses: Na = 23, C = 12, O = 16)
106
300
___ H3BO3 + ___ HF ----------> ___ HBF4 + ___ H2O
1 H3BO3 + 4 HF ---------->1 HBF4 + 3 H2O
300
What is the name of CF4?
Carbon tetrafluoride
400
(1.52 - 0.80) / 144
0.005
400
Provide the complete Lewis structure for SF4.
(See the whiteboard.)
400
How many grams are in 2.0 moles of acetic acid (CH3COOH)? (Molar masses: H = 1, C = 12, O = 16)
120 grams
400
___ CaS + ___ P4 ----------> ___ Ca3P2 + ___ S8
24 CaS + 4 P4 ----------> 8 Ca3P2 + 3 S8
400
Provide the chemical formula for aluminum carbide.
Al4C3
500
(0.3)^2 x (0.4)^2 / (0.02)
0.72
500
Provide the complete Lewis structure for the chlorite ion.
(See the whiteboard.)
500
How many moles are in 5.0 grams of perchloric acid (HClO4)? (Molar masses: H = 1, O = 16, Cl = 35)
0.05 moles
500
___ C3H8 + ___ N2O5 ----------> ___ CO2 + ___ H2O + ___ NO2
1 C3H8 + 10 N2O5 ----------> 3 CO2 + 4 H2O + 20 NO2
500
Why do ionic bonds form when a metal and nonmetal combine to make a compound?
Nonmetals have a much higher electronegativity than metals, so they take electrons from metals to become anions. (Answers may vary.)