CHEM 1250 Study Guide - Quiz Guide: Scientific Notation, Unified Atomic Mass Unit, Lead
Dr. Zellmer Chemistry 1250 Thursday
Time: 30 mins Spring Semester 2016 January 28, 2016
Quiz I
Name Lab TA/time
----------------------------------------------------------------------------------------------------------------------------------------
Show ALL your work or EXPLAIN to receive full credit.
1. (2 pts) Indicate whether each of the following is a physical or chemical change.
a) iron combining with oxygen to form rust
b) boiling of ethanol
2. (4 pts) Perform the following mathematical operation and report your answer to the correct
number of significant figures. Report your answer in scientific notation. Include units.
(5.1000 cm2) (64.84 g + 57.085 g)
)))))))))))))))))))))))))))
=
14.5021 x 10-3 s
3. (2 pts) Fill in the blanks in the table below for the isotopes indicated.
Symbol number of number of number of atomic mass
protons neutrons electrons number number
)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
79
34Se
2!
34
)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
Copyright R. J. Zellmer, January 28, 2016
OVER ...
Document Summary
Show all your work or explain to receive full credit. 1. (2 pts) indicate whether each of the following is a physical or chemical change: iron combining with oxygen to form rust, boiling of ethanol. 2. (4 pts) perform the following mathematical operation and report your answer to the correct number of significant figures. Include units. (5. 1000 cm2) (64. 84 g + 57. 085 g) 3. (2 pts) fill in the blanks in the table below for the isotopes indicated. number of protons number of neutrons number of electrons atomic number mass number. 4. (6 pts) the amount of lead, pb, in the air in a room on a particular day is 1. 55 x 10!4 kg/m3. What volume of air (in ft3) contains 3. 90 x 10!3 lb of lead? (1. 000 lb = 453. 6 g, 1 in = 2. 54 cm) (you must use dimensional analysis (factor unit method) to receive full credit!)
