Quiz 1 ChemLa Spring 2012 Name KEr
Each question is worth 5 points, totaling 40 points for 8 questions.
Useful information: l-Liter= L.0567quarts, 1.gallon=4quarts, Lfoot= L2 inches, Linch= 2.54cm
(exactly)
1.) ldentify the following as physical or chemical changes:
a. Nitric acid burns a hole in your jeans
b. Sugar dissolves in hot tea
2.) Write the equation for converting between deirees Fahren
oF = *("d. se
Convert 45'F to 7, a cetsius &8o,1 *",u'n
3.) How many significant figures are in the following numbers, or are they exact?
a. 0.00340321 g of graphite
b. 13 doughnuts 5iX
.o-vq&
4.) Write the answer with the correct number of significant figures:
a. You have two samples of the same substance. One weighs 0.3452 g and the other
weighs 2.560 g. The combined volume of the two samples is 3'05 mL.
what is the density? 0. 3qra + A, tbO t
@: 035a A l^L
5.) Small spheres of equal mass are made of lead (density 11.3 g/cm3), silver (density 10.5 g/cmt)
and aluminum (density 2.70 g/cm3). List the sphere in order of size from smallest to largest:
le,.l <
5.) Write the symbol or theypme for the following elements:
a' Carbon U
b. Pb
c. Silver
d.N
r chemical
eit and Celsius
nK
