Dr. Chang
Chemistry 121
Autumn 2010
Quiz 1
Name_______________________
Wednesday
October 6, 2010
25 minutes/30 points
Rec. Instructor ______________
YOU MUST SHOW ALL WORK TO RECEIVE FULL CREDIT
1. (9 pts) Perform the following calculations and express the answer using the correct
number of significant figures.
17.65 + 2.035 + 7.0 =
633 x (56.8 – 31.3) =
=
5.032
(3.43 + 0.23)
2. (5 pts) The density of aluminum is 2.70 g/cm3. What is the mass of a 2.0 m x 4.0 m x
8.0 m cube of aluminum?
1
3. (9 pt) Give the chemical symbol or name for each of the following elements and ions.
O ___________
Si ___________
Zn ___________
ClO4- ___________
Potassium ___________
Gold ___________
F ___________
CN- ___________
H3O+ ___________
4. (7 pts) Fill in the blanks.
symbol
119
Sn
protons
neutrons
48
electrons
37
mass number
2
3