WorksheetsAP Chemistry Semester 1 Review
Total questions: 20
Worksheet time: 1hrs 2mins
Which of the following is NOT isoelectronic with the other species?
S2-
Br-
Kr
Sr2+
Which of the following subshells has the lowest energy?
4d
5s
5p
5f
What is ionization energy?
How well an atom attracts electrons in a chemical bond
The relative size of an atom
An atom that has gained or lost an electron
The amount of energy it takes to remove an electron from the valence shell of an atom
Which of the following has the lowest 2nd ionization energy?
N
Mg
K
Cl
Which element has the largest atomic radius?
B
Al
Ca
Mg
Which element has electrons in the greatest number of subshells when it is in its ground state?
C
Na
Ar
Fe
Which element could #3 be based on ionization energy?
Na
Mg
Al
Si
Which of the following is NOT true about ionic compounds?
They conduct electricity when in the liquid state
They are comprised of positive and negative ions
They are ductile (can be made into wire)
They are brittle (break easily)
Which Lewis dot structure shows exactly two unshared pairs of valence electrons?
H2S
CO2
NH3
CBr4
What is the formal charge of Cl?
0
+1
-1
-2
What is the shape of PCl5?
Tetrahedral
Octahedral
Trigonal pyramidal
Trigonal bipyramidal
What type of hybridization does C have in CH2OH?
sp
sp2
sp3
sp3d
How many sigma and pi bonds are in C2H2?
3 sigma and 1 pi
3 sigma, 2 pi
4 sigma, 1 pi
4 sigma, 2 pi
Which of the following would require resonance structures to satisfactorily describe the bonding?
H2O
NO3-
CO2
OH-
Which molecule is nonpolar?
NH3
OF2
SF4
PF5
What is the oxidation state of S in Na2SO4?
-2
+2
+4
+6
Which of the following is NOT soluble in water?
NaSO4
AgBr
Ca(NO3)2
BaSO4
Which of the following would have a positive ΔS?
H2O (g) → H2O (l)
O2 (g) → O2 (aq)
CO2 (s) → CO2 (g)
Cl2 (aq) → Cl2 (s)
A cube of ice is added to some hot water in a rigid, insulated container, which is then sealed. There is no heat exchange with the surroundings. What has happened to the total energy when the system reaches equilibrium?
ΔH increases
ΔH decreases
ΔH remains the same
What is the correct coefficient for O2 when this reaction is balanced?
3
5
6
10
