CHEMISTRY WKST
SEM 1 REVIEW PROBLEMS
NAME: ______________________________________
1.
Determine the density of an object having a volume of 234.4 mL and a mass of 132.1 g.
2.
Convert the following:
a) 1 L → mL
b) 0.0325 μg → ng
Convert the following:
a) 65 mi/h → m/s
b) 1.00 g/mL → lbs/gal
3.
4.
c) 43 m → km
d) 150 dg → cg
Given the following ions, write the correct formula for the compound formed.
2+
3
2
+
2+
3
a) Ba , N ‾
b) SO3 ‾, Rb
c) Pb , PO4 ‾
2
d) S ‾, Na
5.
Name the following compounds. (Don’t forget Roman numerals when applicable.)
a) MgCl2
d) NH4C2H3O2
g) Cl2O7
b) Ba(OH)2
e) Fe2O3
h) NCl3
c) Zn(NO3)2
f) CuSO4
i) SF4
6.
Write the formula for the following compounds.
a) calcium iodide
d) chromium(III) phosphate
b) potassium fluoride
e) strontium carbonate
c) silver chlorate
f) sodium chromate
7.
Name the following acids.
a) H2SO4
b) HCl
+
g) sulfur hexafluoride
h) iodine pentabromide
i) diphosphorus decoxide
c) HC2H3O2
8.
Balance the following equations.
a) ____Al2(SO4)3 + ____H3PO4 → ____AlPO4 + ____H2SO4
b) ____P2O5 + ____H2O → ____H3PO4
c) ____KBr + ____Al(NO3)3 → ____KNO3 + ____AlBr3
d) ____NH3 + ____NO → ____N2 + ____H2O
9.
Tell what type of reaction the following are—give all types. (synthesis, decomposition, single replacement, double
replacement, acid/base, combustion)
a) 4K + O2 → 2K2O
d) H2SO4 + 2NaOH → Na2SO4 + 2H2O
b) NaNO3 + NH4Cl → NaCl + NH4NO3
e) Mg + 2HCl → MgCl2 + H2
c) 2KClO3 → 2KCl + 3O2
f) CH4 + 2O2 → CO2 + 2H2O
10. Predict the products for the following and complete the equation. Balance the equation and include the physical
states for the products. If no reaction, write “NR”.
a) ____Al(NO3)2(aq) + ____LiOH(aq) →
b) ____Mg(s) + ____AlCl3(aq) →
c) ____K2CO3(aq) + ____Na3PO4(aq) →
d) ____Ba(ClO3)2(aq) + ____Na2CO3(aq) →
e) ____HNO3(aq) + ____RbOH(aq) →
f) ____KCl(s) →
g) ____Rb(s) + ____H2O(l) →
h) ____CaCO3(s) + ____H3PO4(aq) →
i) ____Mg(OH)2(s) →
11. Determine the molar mass of the following.
a) C12H22O11
b) Pb3(BO3)2
c) Ba(OH)2•8H2O
12. Determine the mass of the following.
a) 3.015 mol MgCl2
b) 3.2 x 10
13. Determine the moles of the following.
a) 15.3 g C4H10
b) 5.803 x 10
22
CO2 molecules
24
N2O3 molecules
14. Determine the number of oxygen atoms in the following.
a) 3.00 mol O2
b) 44.93 g Al2(CrO4)3
-215. Determine the molarity of the following solutions.
a) 0.825 mol NaCl dissolved in 1500.0 mL of solution
b) 15.00 g NaCl dissolved in 2.25 L of solution
16. Determine the percent by mass of 30.0 g NaOH dissolved in 125.0 g H 2O.
17. Determine the mass of NaOH needed to make 250.0 mL of a 3.00 M NaOH solution.
18. Calculate the mass percent of the elements in the compound Na 2Cr2O7.
19. What volume of H2O, in mL, is needed to make a 20.0 % MgCl2 solution containing 50.0 g of MgCl2?
20. Determine the empirical formula of the compound composed of the following.
a) 63.5% Ag, 8.2% N, and 28.2% O
b) 26.6 g K, 35.4 g Cr, and 38.0 g O
21. A certain compound was analyzed and found to have a composition of 54.6% C, 9.0% H, and 36.4% O. If the molar
mass for this compound is 176 g/mol, what is the molecular formula of the compound? (HINT: Find the empirical
formula first.)
22. For the reaction: 2Al + Fe2O3 → Al2O3 + 2Fe
a) How many moles of Al is needed to react with 27.8 g Fe2O3?
b) What mass of Al2O3 would form if 20.0 g Al reacted?
23. For the reaction: 3Ca(ClO3)2(aq) + 2Na3PO4(aq)  Ca3(PO4)2(s) + 6NaClO3(aq)
If 25.00 g Ca(ClO3)2 is mixed with 40.00 g Na3PO4:
a) What mass of Ca3(PO4)2 forms?
b) What is the limiting reactant?
c) Determine the amount of excess reactant remaining after the reaction.
24. For the reaction: 2H3PO4 + 3Na2CO3 → 2Na3PO4 + 3CO2 + 3H2O
a) What mass of Na2CO3 will react with 25.00 mL of a 0.750 M H3PO4 solution?
b) If 75.0 mL of a 1.10 M H3PO4 solution is mixed with 100.0 mL of a 0.950 M Na2CO3 solution, what is the
theoretical yield of CO2?
c) What is the limiting reactant in #c?
25. Convert the following temperatures:
a) 25°C → °F
b) 65°F → °C
c) −43°C → K
26. Write the ionic and net ionic equations for the following reactions:
a) 3Ca(ClO3)2(aq) + 2Na3PO4(aq)  Ca3(PO4)2(s) + 6NaClO3(aq)
b) 8KClO3(aq) + C12H22O11(s)  8KCl(aq) + 12CO2(g) + 11H2O(l)
c) Zn(s) + 2AgNO3(aq) → Zn(NO3)2(aq) + 2Ag(s)
27. Fill in the chart.
NUCLEAR
SYMBOL
ATOMIC
NUMBER
MASS
NUMBER
80
201
NUMBER
+
OF p
NUMBER
OF n°
NUMBER
OF e‾
33
42
16
78
36
18
19
CHARGE
13 l
64
2+
80
35
u
r1−
39
19
2-