Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. Which value has only 4 significant digits? c. 8450 d. 0.392 a. 6.930 b. 0.0450
____ 2. Which is the sum of these values, to the appropriate number of significant digits?
17.358 + 3.502 + 20.14 = a. 41 b. 41.00 c. 41.000 d. 41.0
____ 3. Which is the product of these numbers, to the appropriate number of significant digits?
56.2
×
9.2057 = a. 517 b. 517.4 c. 517.36 d. 517.00
____ 4. How many significant digits are in the value 530,405,000? a. 4 b. 5 c. 6 d. 9
____ 5. How many significant digits are in the value 0.0050340? a. 3 b. 5 c. 7 d. 8
Atom
Sodium
Protons
Atoms
Neutrons
12
Electrons Mass Number
23
Chlorine 17 17 35
____ 6. According to the table above, how many neutrons are in an atom of chlorine? a. 17 b. 18 c. 34 d. 35
____ 7. According to the table above, how many electrons are in an neutral atom of sodium? a. 22 c. 12 d. 23 b. 11
____ 8. Which is the number of protons in ? a. 26 b. 30 c. 56 d. 82
____ 9. Which is the number of neutrons in ? a. 35 b. 45 c. 80 d. 115

____ 10. Which is the correct formula for the compound formed between beryllium and nitrogen? a. BeN c. Be
3
N
2 d. Be
2
N
3 b. Be
3
N
____ 11. What is the correct formula for the compound formed between magnesium and the phosphate ion? a. MgPO b. Mg
3
4
PO
2 c. Mg
3
(PO
4
)
2 d. MgP
2
O
8
____ 12. Which is the correct formula for the compound Manganese (III) Fluoride? a. MnF b. Mn
3
F c. MnF
3 d. Mn
3
F
3
____ 13. Which is the correct formula for the compound Chromium (II) Nitrate? a. (Cr)
2
NO
3 b. Cr
2
NO
3 c. CrNO d. Cr(NO
2
3
)
2
____ 14. Which is the correct name for the compound FeS? a. Iron Sulfide c. Iron (II) Sulfide b. Iron (I) Sulfide d. Iron (II) Sulfide (II)
____ 15. Which is the correct name for the compound Na
3
P? a. Sodium Phosphide c. Sodium Phosphate b. Sodium Phosphite d. Sodium (III) Phosphide
____ 16. Which is the correct name for the compound CoCO
3
? a. Carbon Oxygen Carbonate b. Cobalt (II) Carbonate c. Cobalt Carbonate d. Cobalt Carbonoxide
____ 17. Which is the correct name for the compound CaClO
2
? a. calcium chloride c. calcium chlorite d. calcium chlorate b. calcium perchlorate
____ 18. Which is the correct name for the compound NH
4
SO
4
? a. Nitrogen Hydrogen Sulfate c. Ammonium (II) Sulfate b. Nitrogen Hydrosulfate d. Ammonium Sulfate
____ 19. Which of the following acids is named incorrectly? a. HC
2
H
3
O
2
; acetic acid b. HBr ; bromic acid c. H
2
SO
3
; sulfurous acid d. HClO
3
; chloric acid
____ 20. Which of the following elements is a metal? a. Boron b. Nitrogen c. Magnesium d. Carbon
____ 21. Which type of reaction can be recognized by the general pattern a. combustion c. single replacement d. decomposition b. synthesis
?
____ 22. Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water? a. decomposition b. double replacement c. synthesis d. combustion

____ 23. Which type of reaction is SiO
2
+ HF
→
SiF
4
+ H
2
O? a. synthesis b. double replacement c. single replacement d. combustion
____ 24. What are the correct coefficients when this equation is balanced? Sb + O
2
→
Sb
4
O
6 a. 1, 2, 10 c. 4, 3, 1 b. 4, 6, 1 d. 10, 5, 1
____ 25. Which are the product(s) of this reaction? Mg + N
2
→ a. NMg b. MgN c. Mg
2
N
3 d. Mg
3
N
2
____ 26. What are the correct coefficients when this chemical equation is balanced?
P
4
+ O
2
→
P
2
O
5 a. 4, 2, 7 c. 2, 5, 4 b. 1, 1, 1 d. 1, 5, 2
____ 27. Which is the molar mass of the element Calcium? a. 20 g/mol c. 40.078 g/mol d. 20.180 g/mol b. 40 g/mol
____ 28. Which is the correct molar mass for the compound FeSO
4
? a. 103.85 g/mol b. 151.85 g/mol c. 415.4 g/mol d. 247.85 g/mol
____ 29. Which is the mass of 8 moles of sodium chloride? a. 7.3 grams b. 468 grams c. 0.137 g/mole d. 468 moles
____ 30. How many grams are in 1.946 moles of NaCl? a. 113.8 g b. 30.1 g c. 0.033 g d. 44.7 g
____ 31. Calculate the number of molecules in 4.0 mol H
2
O. a. 0.60
×
10
23
molecules c. 2.4
×
10
–23
molecules b. 2.4
×
10
24
molecules d. 2.4
×
10
23
molecules
____ 32. Which is the correct mole ratio for aluminum chloride to chlorine in the chemical reaction
AlCl
3
+ Br
2
→
AlBr
3
+ Cl
2
? (Is the equation balanced?) a. 1:1 b. 2:3 c. 1:3 d. 3:2
____ 33. Determine the empirical formula of a compound that contains 40.0% carbon, 53.3% oxygen and 6.67% hydrogen by mass. a. CH
2
O b. C
3
H
7
O
3 c. C
2
H
2 d. CHO
O
2
____ 34. What is the percent composition of silicon nitride (Si
3
N
4
)? a. 30.21% Si and 68.79% N c. 54.03% Si and 45.97% N b. 42.92% Si and 57.08% N d. 60.06% Si and 39.94% N

____ 35. The empirical formula for a compound is CH
2
O, and the molar mass is 180.2g/mol. Which is the molecular formula for this compound? a. C
6
H
12
O
6 b. C
7
H
16
O
5 c. C d. C
8
3
H
H
20
6
O
O
3
4
____ 36. How many moles of KBr will be produced from 7 moles of BaBr
2
?
BaBr
2
+ K
2
SO
4
→
KBr + BaSO
4
( Is the equation balanced?) a. 1 mole b. 7 moles c. 14 moles d. 3.5 moles
____ 37. How many moles of Al would be produced from 20 moles of Al
2
O
3
?
Al
2
O
3
→
Al + O
2
(Is the equation balanced?) a. 10 moles b. 20 moles c. 40 moles d. 4 moles
____ 38. If 16.4 g of oxygen gas react with excess hydrogen gas, what mass of water can be produced?
(write and balance the equation first) c. 20.4g d. 23.9g a. 9.23g b. 18.5g
____ 39. Solid sodium metal and liquid water react to form sodium hydroxide and hydrogen gas. What mass of Na will be needed to react with excess water to produce 15.0g NaOH?
(write and balance the equation first) a. 4.3g b. 5.4g c. 8.6g d. 11g
____ 40. What is the number of moles of carbon dioxide produced from the complete combustion of 5.42 moles of ethanol (C
2
H
6
O). Write and balance the equation first. Remember, the combustion of ethanol requires oxygen gas and produces carbon dioxide gas and water. a. 5.42 moles b. 2.71 moles c. 10.84 moles d. 16.3 moles
Short Answer
41. Write the formulas for each of the following compounds:
a) silicon dioxide b) sodium sulfite c) nitrogen trichloride d) hydrobromic acid e) calcium iodide f) sulfurous acid

g) cesium perchlorate h) ammonia
42. i) tin (II) fluoride j) sulfur hexafluoride k) potassium chlorate l) aluminum nitride m) sodium peroxide n) nitric acid o) ammonium sulfite p) diphosphorous pentoxide q) cobalt (III) nitrate
How many oxygen atoms are there in 2.54 mg of Ca(OH)
2
?
SHOW ALL WORK AND SIG FIGS FOR CALCULATIONS!!
_________________________________________________________________________
43.
A sample of methane (CH
4
) has a mass of 31.1 g. How many molecules of methane are in this sample? SHOW ALL WORK AND SIG FIGS FOR CALCULATIONS!!
_________________________________________________________________

44.
Which compound has the highest percent by mass of oxygen?
Ba(OH)
2
, Cu(NO
3
)
2
, H
2
O, H
2
SO
4
, H
2
O
2
(show work)
45. Use the following reaction to answer questions a-g
Solid aluminum metal reacts with oxygen gas to produce solid aluminum oxide.
SHOW ALL WORK AND SIG FIGS FOR CALCULATIONS!! a. Write and balance the equation above, including symbols for the states of matter .
________________________________________________________ b. How many moles of oxygen gas will it take to react completely with 0.400 moles of aluminum? c. How many grams of oxygen gas is this? d.How many grams of aluminum are in 0.400 moles? e. How many grams of aluminum oxide can be produced from 0.400 moles of aluminum? f. Add the masses of reactants used:___________________
g. Add the masses of products formed:__________________ h. How does the mass from part f compare to the mass from part g? What chemical law does this illustrate?
_____________________________________________________________________

46.
If 11.9g of magnesium chloride reacts with 34.2g of silver nitrate:
a) Write and balance the chemical reaction that occurs
b) Write the net ionic reaction that occurs. (You musts determine which of the products is not soluble and will precipitate.)
c) Determine the limiting reactant
d) How many grams of the precipitate can theoretically be produced?
e) What is the mass of excess reactant?
_______________________________________
________________________