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WorksheetsPRELIM EXAM
Total questions: 60
Worksheet time: 2hrs 30mins
Which one of the following statements about p orbitals is incorrect?
they are found in all principal energy levels
they have a dumb-bell shape
there are three types of p orbital
each p orbital can hold up to two electrons
Which one of the following statements about d orbitals is incorrect?
they are not found in the first two principal energy levels
they are associated with transition elements
there are 5 types of d orbital
d orbitals are filled before p orbitals in the same principal energy level
The Aufbau Principle states that...?
only two electrons can occupy an orbital
electrons enter the lowest available energy level
electrons remain unpaired if possible
orbitals are regions in space where one is likely to find an electron
orbitals are regions in space where one is likely to find an electron
orbitals can hold up to two electrons
orbitals are regions in space where one is likely to find an electron
orbitals can hold two electrons provided they are spinning in the same direction
s, p, d and f orbitals are possible
Which one of the following statements is correct?
the 3d sub level is filled before the 4s sub level
the 3rd principal energy level only contains 8 electrons
principal energy levels get closer together as they get further from the nucleus
orbitals are always filled in numerical order
The electronic configuration of an atom an element with atomic number 8 is...
1s2, 2s6
1s2, 2s2, 2p6
2s2, 2p6
1s2, 2s2, 2p4
Which one of the following is not the electronic configuration of atom of a noble gas?
1s2
1s2, 2s2
1s2, 2s2, 2p6
1s2, 2s2, 2p6, 3s2, 3p6
The order of filling orbitals is...
1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p
1s, 2s, 2p, 3s, 3p, 3d, 4p, 3d
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p
4p, 4s, 3d, 3p, 3s, 2p, 2s, 1s
Hund's Rule states that...
you must not sit next to another person on a bus
electrons enter the lowest available energy level
an orbital can hold up to two electrons
electrons in similar energy orbitals remain unpaired as far as possible
Which of the following atoms has three unpaired electrons?
B
C
N
O
What is the electronic configuration of a sodium ion Na+?
1s2, 2s2, 2p6
1s2, 2s2, 2p6, 3s1
1s2, 2s2, 2p6, 3s2
1s2, 2s2, 2p6, 3s2, 3p6, 4s1
What is the electronic configuration of an oxide ion O2-?
1s2, 2s2, 2p2
1s2, 2s2, 2p4
1s2, 2s2, 2p5
1s2, 2s2, 2p6
Which one of the following is not isoelectronic with the others?
Fˉ
Ne
Na+
Mg+
Which one of the following ions has an electronic configuration similar to argon?
Ti+
Ti2+
Ti3+
Ti4+
Electrons enter the 4s sub-level before the 3d sub-level because...
there is only one 4s orbital and there are 5 3d orbitals
the 4s orbital is spherical
the 4s orbital has a lower energy
the 3d orbitals have a lower energy
Which of the atom pairs both have only three unpaired electrons in their d orbitals?
Ti and V
Ti and Co
V and Cr
V and Co
Which of the following atoms has the greatest number of unpaired electrons ?
Ti
V
Cr
Mn
When a metal forms an ionic bond with a non-metal, the nonmetal atoms will _____.
lose an electron and become a positive ion
gain an electron and become a positive ion
lose and electron and become a negative ion
gain an electron and become a negative ion
Which type of bonding would be expected between Cu and S?
ionic
hydraulic
polar covalent
non-polar covalent
Which is true of a non-polar covalent bond?
the electron affinity difference of the atoms is very large
the electronegativity difference of the atoms is very large
the electron pair is shared unequally by the bonded atoms
the electron pair is shared equally by the bonded atoms
The relative numbers of atoms of each kind in any chemical compound (using atomic symbols and subscripts) is known as a _____.
compound formula
scientific formula
chemical formula
molecular formula
Of the following, the most likely pair to form an ionic bond is _____.
a halogen and a mettalloid
a halogen and an alkaline earth metal
an alkaline earth metal and a transition element
an alkali metal and an alkaline earth metal
Which type of bonding would be expected between H and F?
non-polar covalent
hydraulic
ionic
polar covalent
Polyatomic ions combine with ions of opposite charge to form _____.
covalent compounds
ionic compounds
charged particles
molecules
Which of the following is in an ionic bond?
F2
H2O
MgCl2
NO
Which of the following contains a nonpolar covalent bond?
NaCl
H2O
F2
MgO
Which of the following differences in electronegativity is most likely to result in the formation of an ionic bond?
greater than 1.7
between 0.3 and 1.7
less than zero
between zero and 0.3
What determines bond length?
the distance at which potential energy is at a minimum
the distance at which the two atoms are as close as possible
the point at which the attraction forces outweighs the repulsion forces
the distance at whch potential energy is at a maximum
The less the electronegativity differences between two bonded atoms, the greater the _____.
polar character
metallic character
ionic character
covalent character
How are bond length and bond energies related?
they are not related
the lower the bond energy, the shorter the bond length
the higher the bond energy, the longer the bond length
the higher the bond energy, the shorter the bond length
An atom has a mass number of 23 and atomic number 11. The number of protons are_________.
11
12
23
44
The mass of the atom is determined by________.
neutrons
neutron and proton
electron
electron and neutron
What are likely formula of BeF? , the number of the atom/subscript with "?" of your answer.
1
2
3
4
What are likely formula of H?O , the number of the atom/subscript with "?" of your answer.
1
2
3
4
What are likely formula of [Fe(CN)?]-3 , the number of the atom/subscript with "?" of your answer.
3
4
5
6
What are likely formula of [P?O7] -4 , the number of the atom/subscript with "?" of your answer.
4
3
2
1
Rank the following substances in order of increasing acidity: Acetone pKa=19.3, Phenol Ka=1.3 x10 exp.-10, Acetic Acid pKa=4.76, Pentane-2,4-dione Ka=1.0 x10 exp.-9
Acetone, Phenol, Acetic Acid, Pentane-2,4-dione
Acetone, Acetic Acid, Phenol, Pentane-2,4-dione
Acetone, Pentane-2,4-dione, Phenol, Acetic Acid
Pentane-2,4-dione, Phenol, Acetic Acetic Acid, Acetone
The ammonium ion has pKa= 10.66 and methylammonium ion has pKa= 9.25. Which is the stronger base?
Ammonium ion
Methylammonium ion
Both ions
Equal
Ammonia has pKa= 36 and acetone has Ka= 1.0 x 10 exp. -19. Which is the stronger acid?
Ammonia
Acetone
Both acids
None of the above
The organic acids methanol (pKa= 15.54), acetic acid (pKa= 4.76), and acetone (pKa= 19.3), which of the following is less acidic?
Methanol
Acetic Acid
Acetone
None of the above
Ammonia has pKa= 36 and acetone has Ka= 1.0 x 10 exp. -19, which is the weaker base?
Ammonia
Acetone
Both ammonia and acetone
None of the above
Indicate the direction of the bond polarity of H3C-Br
---|------------------------>
<------------------------|---
Indicate the direction of the bond polarity of H2N-H
---|------------------------>
<------------------------|---
Indicate the direction of the bond polarity of H3C-MgBr
---|------------------------>
<------------------------|---
Indicate the direction of the bond polarity of Ti-Cl3
---|------------------------>
<------------------------|---
Indicate the direction of the bond polarity of Mg-Cl2
---|------------------------>
<------------------------|---
Convert the line bond structure into molecular formula:
C20 H29 O
C20 H30 O
C19 H30 O
C20 H30
Convert the line bond structure into molecular formula:
C40 H56
C50 H40
C56 H40
C40 H55
Convert the molecular formula to line bond structure: C6H8O6
Convert the molecular formula to line bond structure: C2H6O
Which one of the following is a proper orbital configuration?
A
B
C
D
Which one of the following is a proper orbital configuration?
A
B
C
D
Which one of the following is the proper orbital configuration for a neutral lithium atom?
A
B
C
D
Calculate the formal charges on the indicated atoms in each compound below.
For the atom labeled letter "A"
0
+1
-1
+2
Calculate the formal charges on the indicated atoms in each compound below.
For the atom labeled letter "B"
0
+1
-1
+2
Calculate the formal charges on the indicated atoms in each compound below.
For the atom labeled letter "C"
0
+1
-1
+2
Calculate the formal charges on the indicated atoms in each compound below.
For the atom labeled letter "D"
0
+1
-1
+2
Tell whether the following structures are the resonance of this species. (TRUE or FALSE)
TRUE
FALSE
How many resonance structures for NO3- ion?
1
2
3
4
How many resonance structure can you draw for benzene?
4
3
2
1
