Chemistry 1320 EXAM 1
1.
How many sig figs does the result of the following operation contain?
8.52010 x 7.90 =
A) 4 B) 2 C) 3 D) 5 E) 6
2.
Which of the following wavelengths of electromagnetic radiation has the highest energy?
A) 2.50 x 10
-5
m B) 8.40 x 10
-7
m C) 224 nm D) 3.50 x 10
-9
m E) 450 nm
3.
Which element has the following ground-state electron configuration?
[Xe]6s 2 4f 14 5d 4
A) Re B) Pm C) Mo D) W E) Np
4.
Which is the correct formula for copper(II) phosphate?
A) Cu
2
PO
4
B) Cu
3
(PO
4
)
2
C) Cu
2
PO
3
D) Cu(PO
4
)
2
E) Cu(PO
3
)
2
5.
1 barrel of oil contains 42.0 gallons. How many liters is this? (1L = 1.06 qt and 4 qt = 1 gal.)
A) 11 L B) 142 L C) 158 L D) 9.9 L E) 178 L
6.
Arrange the following ions in order of decreasing ionic radius: Al 3+ , Mg decreasing radius

2+ , Na + , O 2.
A) O 2 > Na + > Mg 2+ > Al 3+ D) Al 3+ > Mg 2+ > O 2 > Na +
B) Al 3+ > Mg 2+ > Na + > O 2E) Na + > Mg 2+ > Al 3+ > O 2-
C) O
2-
> Al
3+
> Mg
2+
> Na
+
7.
Which of the following elements is chemically similar to magnesium?
A) sulfur B) potassium C) nickel D) calcium E) iron
8.
Predict the formula for the ionic compound formed between barium and phosphorus.
A) Ba
3
P
2
B) Ba
2
P C) Ba
2
P
3
D) BaP
2
E) BaP
9.
Which of the following atoms has the greatest electron affinity (largest positive value)?
A) Li B) P C) Br D) Ga E) S

10.
The effective nuclear charge (Z eff
) felt by the outermost electrons is the strongest for which of the following elements?
A) Si B) P C) Cl D) Al E) S
11.
Calculate the wavelength of a neutron that has a velocity of 250 cm/s. (The mass of a neutron = 1.675 x 10
-24
g)
A) 0.016 nm B) 1.6 x 10 -4 m C) 160 nm D) 1.6 pm E) 0.16 nm
12.
Which of the following compounds is ionic?
A) P
2
O
5
B) SOCl
2
C) HCl D) MgBr
2
E) H
2
O
13.
Calculate the average atomic mass of Element X using the following data:
Isotope Abundance Mass
6 X 7.5% 6.0151 amu
7
X 92.5% 7.0160 amu
A) 6.02 amu B) 7.02 amu C) 6.50 amu D) 6.51 amu E) 6.94 amu
14.
The correct name for NH
4
NO
3
is
A) ammonium nitrate
B) hydrogen nitrogen oxide
C) ammonium nitrogen trioxide
D) hydrogen nitrate
E) ammonia nitrogen oxide
15.
What is the energy in joules of a mole of photons associated with red light of wavelength 7.00 x 10 2 nm?
A) 4.72 x 10
-43
J B) 12.4 kJ C) 1.71 x 10
5
J D) 256 kJ E) 2.12 x 10
42
J
16.
How many valence electrons does S 2 have?
A) 4 B) 2 C) 8 D) 16 E) 6
17.
Which ground-state atom has an electron configuration described by the following orbital diagram ?
[Ar]
     
 
4s 3d 4p

A) tellurium B) germanium C) selenium D) phosphorus E) none of these

18.
For which of the following reactions is the enthalpy change equal to the third ionization energy of vanadium?
A) V 2+ (g)

V 3+ (g) + e -
B) V
3+
(g)

V
4+
(g) + e
-
C) V(g)

V 3+ (g) + 3e -
D) V 3+
E) V
2-
(g) + e
(g) + e
-

V

V
3-
2+ (g)
(g)
19.
Complete the following chart, in order from left to right:
Isotope Mass number Protons Neutrons Electrons
14 N
A) 14, 7, 14, 7
B) 14, 7, 7, 7
C) 7, 7, 7, 7
D) some other answer
E) 7, 14, 7, 7
20.
Which of the following make an isoelectric pair : Cl
-
, O
2-
, F, Ca
2+
, Fe
3+
?
A) O 2 and F D) Ca 2+ and Fe 3+
B) F and Cl -
C) Cl and Ca 2+
E) none of the above
21.
A possible set of quantum numbers for thelast electron added to complete an atom of gallium (Ga) in its ground state is n l m l m s
A. 3
B. 4
C. 3
1
2
1
1
1
0
+1/2
+1/2
-1/2
D. 4
E. 4
1
0
0
0
+1/2
-1/2
A) B B) D C) A D) E E) C
22.
What is the mass of 4.50 x 10
22
Cu atoms?
A) 7.46 x10 -2 g B) 7.47 x 10 -2 amu C) 63.55 amu D) 4.75 g E) 63.55 g

1) When photons with a wavelength of 310 nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 x 10
5
m/s. Find the de Broglie wavelength of these fastest ejected electrons.
2)
A excited hydrogen atom’s electron is in the n = 2 quantum state. To which quantum state will the electron be promoted if it absorbs a photon with frequency 4.565 x 10 14 s -1 ?