2. 54.0 g of dinitrogen trioxide contains: a)
4.28 x 1023 atoms of nitrogen b) 0.710 mol of dinitrogen
trioxide
c) 4.28 x 1023 moles of dinitrogen
trioxide d) 54 atoms of dinitrogen trioxide
3. Which one of the following is an molecular formula: and not
an empircal formula? a) O2
b) H2O2
c) Al2(SO4)3
d) C10H21F
4. Which of the following is one mole? a) 14.0 g nitrogen b) 7.0 g of N c) 6.02 x 1023 g of N d) 28.0 g of nitrogen
5. A base is a substance that: a) has pH below 7 b) is always ionic c) forms OH-1 in water
6. 1 mole of carbon is: a) 6.0 amu b) 12.0 amu c) 6.02 x 1023 atoms d) 12.0 molecules
7. To convert moles to grams: a) ÷ molar mass b) × molar mass c) ÷ 6.02 x 1023 d) × 6.02 x 1023
8. What is the mass of a chlorine atom? a) 6.02 x 1023 b) 35.5 g c) 5.90 x 10-23 g d) no correct answer
9. The formula weight of sodium nitride is: a) 37.0 b) 82.98 c) 65.01 d) 60.0
10. 0.50 mol of CO2 is: a) .5 g b) 3.01 x 1023 molecules c) 0.5 x 1023 g d) 44 g of CO2
11. The molar mass or formula weight of ammonium nitrate is: a) 88.99 c) 80.04 b) 98.08 d) 213.0
12. What is the molar mass of a substance with a formula of C4H3O2? a)47.03 b) 83.1 c) 29.02 d) 81.1
13. The reaction, Cs3N2 ¾®
3 Ca + N2 , is a: a) neutralization reaction
b) decomposition reaction c) single
replacement reaction d)
combination reaction
14. Balanced equations must follow the law of conservation of mass. a) true b) false
15. A neutralization reaction will always: a) have only 1 product
b) form HCl c) react an H+1 and OH-1
d) form NaOH
16. 4 pt In the expression 4 CaCl2, what
is the coefficient ____ and what is the subscript ____
17. 4 pt Which of the following is a decomposition reaction.
___ 2
Al + 3 Cu(NO3)2 ¾®
2 Al(NO3)3 + 3 Cu
___ 3
Ca + 2 P ¾®
Ca3P2
___ 2
NaHCO3 ¾®
Na2O + H2O
+ CO2
___ Ca(OH)2
+ 2 HC2H3O2¾®
Ca(C2H3O2)2
+ 2 H2O
18. 16 pt Balance the following equations:
a) sodium carbonate + acetic acid ¾® sodium acetate + carbon dioxide + water
b) potassium hydroxide + phoshoric acid ¾® potassium phoshate + water
19. 8 pt What is the percentage of each element in ammonium sulfate
20. 4 pt How moles are there in 5.80 x 1021
molecules of water?
21. 6 pt Defne the following terms:
a) neutralization
b) molar mass
22. 6pt What is the empirical formula of a compound with the following
composition:
N - 21.21%; O
- 48.45%; Ca - 30.34%
23. 4 pt Identify the following reaction as combination, decompostion, or neutralization
___________ a) Al + P ¾® AlP
___________ b) 2 NaOH + H2CO3 ¾® Na2CO3 + 2 H2O
24. 6 pt What is the mass of 2.0 x 1021 moles of hydrogen
25. 5pt How many moles in 4892 grams of vanadium (V) nitrate?
26. 6 pt What is the value of Avogadro's number? __________________