CHEM 1250 Study Guide - Quiz Guide: Scientific Notation, Sodium Bisulfate, Sodium Chloride
Dr. Zellmer Chemistry 1250 Tuesday
Time: 30 mins Spring Semester 2016 January 26, 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 property.
a) ammonia melts at !77.7EC
b) sodium combines with chlorine
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.
1.4557 x 103
J
))))))))))))))))
)))))))))
=
(0.3755 kg) x (46.75
o
C - 37.105
o
C)
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
)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
235
92U
4+
235
)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
Copyright R. J. Zellmer, January 26, 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 property: ammonia melts at !77. 7ec, sodium combines with chlorine. 2. (4 pts) perform the following mathematical operation and report your answer to the correct number of significant figures. 1. 4557 x 103 j (0. 3755 kg) x (46. 75oc - 37. 105oc) 3. (2 pts) fill in the blanks in the table below for the isotopes indicated. Symbol number of protons number of neutrons number of electrons atomic number mass number. 4. (6 pts) the amount of cadmium, cd, in the air on a particular day is 1. 59 x 10!10 lb/ft3. How many kilograms (kg) of cadmium are present in 3. 00 m3? (1. 000 lb = 453. 6 g, 1 in = 2. 54 cm) (you must use dimensional analysis (factor unit method) to receive full credit!)
