Name:_______________________________
Chemistry Final Practice
1. Convert 25mg to kg. Show your work using dimensional analysis.
25mg x 1kg
= 2.5 x10-5
1000000mg
2. Write the electron configuration, orbital diagram, electron dot structure, and atom model for
aluminum. * sorry for not showing the orbital diagram and the model, it was not possible to create
them with Word.
.
1s2 2s2 2p6 3s2 3p1
Al
. .
3. Compare ultra violet rays to gamma rays in terms of wavelength, frequency, energy and speed.
Gamma has a higher frequency and lower wavelength. They both have the same speed.
4. Draw the Lewis diagram between calcium and fluorine. What is the bond angle/shape?
F-Ca-F
Dots are not shown, but the shape should be linear /180o
5. Draw the Lewis diagram between phosphorous and iodine. What is the bond angle/shape?
P
I I I
6. Complete the following chart:
Element Atomic #
Mass #
Fe
26
56
+2
Zn
30
65
As-3
33
75
Hg-202
80
202
This should be pyramidal, 107.3
# of p+
26
30
33
80
7. a) Draw a molecule of methane. Bond angle?
H
C
H H H
b) Draw a molecule of water. Bond angle?
H O
H
# of e26
28
36
80
# of no
30
35
39
122
This should be tetrahedral, 109.5
This is bent ,104.5
8. A gas occupies 150mL at 25ºC and 100kPa. What is the volume at STP conditions?
100kpa x 150ml
298
= 101.3 kPa x V2
273
V2 = 140ml
Combined Gas Law
9. If you have 50g of carbon dioxide at 2atm and 20ºC, what is its volume?
PV = nRT
2atm x V = 1.14mol x 0.0821Latm/molK
V= 13.7L
10. Name the following compounds:
BeBr2: beryllium bromide_____________________________________
NiO nickel II oxide______________________________________
N3O5 trinitrogen pentaoxide_____________________________________
FeCO3 iron II carbonate____________________________________
C4H10 butane_____________________________________
11. Write the formula for the following compounds:
Aluminum sulfate __Al2(SO4)3______
Ammonium sulfide _(NH4)2S______
Copper (II) oxide ___CuO_____
Propene ___C3H6
Dihydrogen monoxide ___H2O____
12. Determine the percent composition of aluminum carbonate.
Total mass = 234g
Al = 23% C = 15% O=62%
13. What is the empirical and molecular formula for a compound that is 40.7% carbon, 54.2% oxygen
and 5.1% hydrogen? The molar mass of the compound is 177g/mol.
Empirical formula = C2H3O2
Molecular formula 177/59 = 3
C6H9O6
14. a) Write the balanced chemical reaction between calcium and water.
Ca(s) + 2H2O(l)  Ca(OH)2(aq) + H2(g)
b) What type of reaction is this? Single replacement___________________________________
3 Fe (s) + 4 H2O (g)  Fe3O4 + 4 H2 (g)
15.
a) When 30g of water is mixed with 60g of iron, which is the limiting and excess
reactant?
Iron is the limiting reactant
b) What mass of Fe3O4 will be produced?
Mass = 82.8 g
16. Consider bromine when answering the following:
a) What category of elements does Br belong to? ______nonmetal_________________
b) What group does it belong to? _______halogens__________________
c) What period does it belong to? ____4___
d) Number of valence electrons? ___7___
e) Number of energy levels in the neutral atom? ___4___
2 Pb(NO3)2 (s)  2 PbO (s) + 4 NO2 (g) + O2 (g) (Interpret the equation to answer the Q’s)
17.
a) What volume of oxygen gas is produced from 10g of Pb(NO3)2?
Volume = 0.338 L
b) How many moles of PbO form ?
moles= 0.03
18. Write out the combined gas law, the write the equations for Boyles, Charles and Guy-Lussac beneath
it.
P1V = P2V2
T1
T1
P1V = P2V2
Boyles
V = V2
T1 T1
Charles
P1 = P2 Guy-Lussac
T1 T1