Hon Chem Sem 1 Exam Part I - PRACTICE
Name: ________________________ Per: ___
Answers are posted here: jing videos.
1. An empty graduated cylinder weighs 89.47 g. Some salt water (D = 1.145 g/mL) is added and the total mass of the
cylinder and salt water is 114.52 g. Then some metal pellets are added until the liquid level reaches the 50.0 mL mark.
Now the total mass is 286.33 g. Determine a) what volume of salt water is in the cylinder and b) the density of the metal
pellets.
a: _________ b: ________
2. Copper has two isotopes: 65Cu is the symbol for one isotope and it has a precise mass of 64.9278 and accounts for
30.830% of the element. What is a) the percent, b) the precise mass (to five sig figs) and c) the symbol of the other
isotope?
a: ________ b: _________ c: ________
3. E = h c =  h = 6.626 x 10-34 Js c = 3.00 x 108 m/s a) What is the wavelength (in m) of a 3.45 x 10-18J photon?
b) What would the wavelength be in nm?
c) What is its speed?
d) What is its frequency? e) How long will it
take for this photon to travel the length of your pen (18.4 cm)?
(1 m = 1x109nm) Watch units and sig figs.
Show your work:
a: __________
b: __________
c: __________
d: __________
e: __________
4. What will a 65.3 mL chuck of lead appear to weigh submerged in salt water? Lead’s density is 11.3 g/mL, and salt
water’s density is 1.154 g/mL
ans: _________
5. Write the long electron configuration for Ni (#28) _______________________________________________
Write the short-cut electron configuration for Bi(#83) __________________________________________
How many valence electrons does an atom of Ni have? ___
How many valence electrons does an atom of Bi have? ___
6. At right, use the circles provided to draw a Bohr diagram for sulfur (#16)
What is sulfur’s valence level? __ What is sulfur’s valence number? ___
In the sulfur atom, what effective nuclear charge (z*) would be “felt” by an electron
in the…
…1st level? ___ …2nd level? ___ …3rd level? ___ …4th level? ___
Put a triangle around one of the electrons that would be hardest to remove.
7.6 Draw Lewis structures for each of the following. (Use scrap paper if you wish; then transfer the answer to the box.)
a) BeBr2
b) SeF4
c) SiO32d) HCN
8. Draw 3-d sketches for the following molecules. The first is done for you.
F
FCF
F
I
I s I
I
IF5 (draw your own Lewis structure)!
F
FBF
H
HPH
F
C F
F F
9. How many atoms would be present in a 2.45 cm by 1.68 cm x 0.86 cm copper block (D = 8.96 g/mL)? ____
A mole of copper weighs 63.546 g and contains 6.002 x 1023 atoms. To receive full credit, your work must be in NEAT
factor label form.