Summer 07
Chem 100
Ch 2.10, 3, 4
100 Pts
Name ____________________________
For Full Credit show all work
Part 1 Choose the single best answer
5 pts each
1) What is the specific heat of a metal if it takes 26.5 calories to raise the temperature of a piece weighing
50.0 g by 5.00 Celsius degrees?
A) 250 cal/g °C
B) 133 cal/g °C
C) 6.63 cal/g °C
D) 1.89 cal/g °C
E) 0.106 cal/g °C
2) How many electrons can occupy the 4d subshell?
A) 1
B) 2
C) 6
D) 8
E) 10
3) The atomic number of an atom containing 29 protons, 29 electrons, and 34 neutrons is
A) 5.
B) 29.
C) 34.
D) 58.
E) 63.
35 Cl contain ________ protons and ________ neutrons.
4) Atoms of 17
A) 17, 17
B) 17, 18
C) 18, 17
D) 35, 18
E) 35, 17
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5) What is the electron configuration of Mg?
A) 1s22s22p8
B) 1s22s22p63s2
C) 1s22s22p63s13p
D) 1 s22s22p63s23p64s23d
E) none of the above
35 Cl) for an element containing 27 protons, 27
6) In the space provided, write the Complete symbol (i.e. 17
electrons, and 36 neutrons, is
7) Which of the following electron configurations is most stable?
A) 1s22s2
B) 1s22s22p2
C) 1s22s22p3
D) 1s22s22p4
E) 1s22s22p6
8) An atom with 6 valence electrons will most likely ________
A) lose 6 electrons.
B) gain 6 electrons.
C) gain 4 electrons.
D) lose 3 electron.
E) gain two electron.
9) Which of the following elements is most likely to form an ion with a +2 charge?
A) Mg
B) Si
C) S
D) K
E) Br
10) What is the formula of a compound formed by the ions M 3- and X2+?
A) X3M2
B) X2M3
C) M2X3
D) M3X2
E) M2X3
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Part 2 Complete the following, show all of your work
10 pts each
11) If 275.0 g of water at 30.0°C absorbs 450 calories, the new temperature will be
12) An imaginary element Xq consists of two isotopes having masses of 100.0 amu and 102.0 amu. A sample of
Xq was found to contain 20.0% of the 100Xq isotope and 80.0% of the 102Xq. Calculate the atomic weight of
Xq.
13) Write both the complete and noble gas electron configurations for Tl-81
14) Write the complete electron configuration for S2-
15) Write the most likely molecular formula between an atom of gallium and oxygen
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