key-eng-fall07-q8059x02z8y - 1 pt ½ sig figs ½ units 4(3...

CHEM 2045C: Quiz 2 NAME __________KEY____________ N #_______________
Show your work for full credit Eng Q8059x02-zeta-8-y
Potentially helpful information
1 in = 2.54 cm (exactly) 1 lb = 453.59 g 1 L = 1.0567 qt ° C =
5
/
9
( ° F – 32) K = ° C + 273.15
For full credit, show all of your work legibly , observe all significant figures rules, and box your answers.
1. (4 pts) Give the missing name or chemical symbol of the element, as appropriate, for the following.
lithium Li
nitrogen N
manganese Mn
magnesium Mg
2. (5 pts) Convert 0.02500 ft
3
to cm
3
.
002500
12
1
254
1
707 9 3
3 3
3 3
3 3
3 3
3 .
.
. ft
in
ft
cm
in
cm × × =
2 points each conversion factor (1 pt if they didn’t cube)
1 point for the answer (½ sig figs, ½ units)
3. (2 pts) Silver melts at 1.763 × 10
3
° F. What is the melting point of silver in Kelvin?
Change Fahrenheit to Celsius
° C =
5
/
9
( ° F – 32) =
5
/
9
(1.763 × 10
3
° F – 32) = 961.7 ° C 1 pt
Change Celsius to Kelvin
K = ° C + 273.15 = 961.7 ° C + 273.15 = 1234.8 K