Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.277 g of CO2 and 1.161 g of H2O. What is the empirical formula of the compound?
C5H2
CH2
C4H10
C2H5
What is the mass of 0.500 mol of trichlorofluoromethane, CCl3F?
275 g
3.64 * 10^-3 g
137 g
68.7 g
Use Lewis theory to determine the chemical formula for the compound formed between Mg and N
Mg2N3
MgN
MgN2
Mg2N
Mg3N2
Place the following in order of decreasing radius
Te2- F- O2-
F— > O2- > Te2-
F- > Te2- > O2-
Te2- > F- > O2-
Te2- > O2- > F-
O2- > F- > Te2-
Which one of the following elements is a poor conductor of heat and electricity?
copper
iron
iodine
lead
How many electrons are in the ion, S2-?
14
34
30
18
Identify the correct values for a 2p sublevel
n = 3, l = 1, ml = 0
n = 2, l = 1, ml = 0
n = 1, l = 0, ml = 0
n = 2, l = 1, ml = +2
n = 4, l = -1, ml = +2
Which of the following transitions (in a hydrogen atom) represent absorption of the smallest
frequency photon?
n = 1 to n = 4
n = 5 to n = 1
n = 3 to n = 1
n = 5 to n = 6
n = 1 to n = 2
What is the energy of light associated with a transition from 3s to 8p in a hydrogen atom? Does this represent absorption or emission of a photon? The Rydberg constant is 1.097 x 10^-2
2.08 x 10^-19 J, emission
2.08 x 10^-19 J, absorption
4.54 x 10^-19 J, absorption
4.54 x 10^-19 .1, emission
6.81 x 10^-20 J, absorption
Identify an anion
An atom that has lost an electron
an atom that has lost a neutron and a proton
an atom that has gained an electron
an atom that has gained a neutron and a proton
Neon belongs to the __ of the periodic table
alkali metal
noble gas
halogen
alkaline earth metal
Which species has the highest ionization energy?
Al2+
Mg+
Mg
Al+
Mg2+
Choose the compound below that should have the highest melting point according to the ionic bonding model
CaS
MgO
LiF
AlN
RbF
Give the structure for lithium chlorate
LiClO3
LiClO4
LiClO
LiClO2
What is the empirical formula of a compound that is 48.6% C, 8.2% H, and 43.2% 0 by mass?
C3H6O2
C6HO5
C6H12O4
C4H8O3
C3HO2
Give the number of valence electrons for SI4
28
34
32
30
Draw the best Lewis structure for CH3+1. What is the formal charge on the C?