Chemistry 112
First Hour Exam
Name:____________
(4 points)
Please show all work for partial credit
All problems are worth 12 points
1. Below are four calculations and the answers to the calculation. Re-write the answers
to these calculations with the correct number of significant figures.
A.
.035 moles/.136 L = .257352941 moles/L
________________
B.
1.32x103 + 56158x10-3 =1376.158
________________
C.
(234 x 100) + ( .0034 x (5.3573x105))
________________
D.
The volume of a sphere with a radius of 5.060 m
=
=
2. Perform the following unit conversions
A. 15 ft to meters
B. 2.593 x103 cm to km
C. 1,360 ft/sec to miles/hour
D. The density of uranium 19.1 g/mL to lbs/ft3
(1 mL = 1 cm3)
3
=__5_4_2_.4_0_0_3_1_7_7__m___
2
3. What are the 4 major ideas or hypotheses that make up Dalton’s Atomic Theory?
4.Fill in the missing information on the following table:
Symbol
# Protons
# Neutrons
# electrons
C
20
16
18
Cr+6
5.
Name an Alkali metal____________
A halide (or halogen) will have what charge in an ionic compound?___________
Strontium belongs to what family?__________________
Which element does not belong to this set and why?
Si,P,Ge,As
Does not belong_______
Why?_______________________
Name the noble gas in the third period __________________
6. Name the following compounds;
MgCl2 _______________
CrO3 _______________
PO5
_______________
HBr
_______________
NaNO2 ______________
3
7. Give the chemical formula for the following compounds:
Potassium sulfide
_______________
Tin(IV) oxide
_______________
Magnesium sulfite _______________
Dinitrogen tetrahydride ____________
Nitrous Acid
_______________
8. Using unit conversions - In June the Army Corp of Engineers opened the dam at Lake
Oahe, and started releasing water at the rate of 150,000 cubic feet per second.
A. Express this rate in liters/msec
Dakota Dunes is a development along the Missouri river that was threatened with flooding
when this release occurred. Dakota Dunes is a 2000 acre tract of land, and an acre is
43,560 sq ft.
B. If all the water coming from Oahe was directed at Dakota Dunes, how deep
would the water be after 1 minute?
It looks like the largest fire currently burning in Texas is the Bastrop County Fire complex
in which 34,068 acres have been burned.
C. If all the water coming out of Oahe could have been directed at this fire, how long
would it take to cover the entire 34,068 acres with 1 inch of water?