TTU General Chemistry

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Chem 111 - Quiz 3D - Fall, 1997
Chapter III: Chemical Reactions & Reactions Stoichiometry

1. What is the maximum amount of Ca3(PO4)2 that can be prepared from 9.8 g of Ca(OH)2 and 9.8 g of H3PO4?

3Ca(OH)2 + 2H3PO4 --> Ca3(PO4)2 + 6H2O

a) 6.8 g
b) 8.6 g
c) 10.3 g
d) 13.7 g
e) 15.5 g

2. How many grams of PI3 could be produced from 250 g of I2 and excess phosphorous if the reaction gives a 98.5% yield?
P4 + 6I2 --> 4PI3

a) 246 g
b) 254 g
c) 266 g
d) 270 g
e) 286 g

3. What mass of 30.0% Ca(NO3)2 solution contains 60.0 grams of water?

a) 42.0 g
b) 85.7 g
c) 58.0 g
d) 14.3 g
e) 62.4 g

4. If 40.0 mL of H2SO4 solution reacts with 0.212 g of Na2CO3, what is the molarity of the H2SO4 solution?

Na2CO3 + H2SO4 --> Na2SO4 + CO2 + H2O

a) 0.50 M
b) 0.10 M
c) 0.20 M
d) 0.40 M
e) 0.050 M

5. What volume of 0.122 M HCl would react with 26.2 mL of 0.176 M NaOH?

a) 37.8 mL
b) 18.2 mL
c) 5.56 mL
d) 26.3 mL
e) 75.6 mL

6. Which of the following is an alkaline earth metal?

a) Zr
b) Sn
c) Ca
d) Li
e)Th

7. Which element and group are NOT CORRECTLY matched?

a) Sb/metalloid
b) Kr/noble gas
c) Al/alkali metal
d) F/halogen
e) Ca/alkaline earth metal

8. Which one of the following is a strong acid?

a) HF
b) HNO3
c) CH3COOH
d) H2SO3
e) H2CO3

9. Which one of the following is a strong soluble base?

a) Ni(OH)2
b) Mg(OH)2
c) RbOH
d) Cr(OH)3
e) Fe(OH)3

10. Which one of the following salts is insoluble in water?

a) NH4CN
b) Ni(NO3)2-6H2O
c) LiNO3
d) MnS
e) Ba(CH3COO)2

11. What is the net ionic equation for the following formula equation?

Cu(NO3)2(aq) + H2S(aq) --> CuS(s) + 2HNO3(aq)

a) Cu2+ + H2S --> CuS + 2H+
b) Cu2+ + 2NO3- + H2S --> CuS + 2H+ + 2NO3-
c) Cu2+ + 2H+ + S2- --> CuS + 2H+
d) Cu2+ + S2- --> CuS

12. Write the balanced formula unit equation for the complete neutralization of H3PO4 with Ca(OH)2. What is the sum of the coefficients? Use the smallest whole number coefficients and don't forget coefficients of one.

a) 10
b) 12
c) 14
d) 16
e) 18

13. What is the oxidation number of N in NaNO3?

a) +1
b) +2
c) +3
d) +4
e) +5

14. What is the oxidation number of P in H2PO2-1?

a) +1
b) +2
c) +3
d) +4
e) +5

15. Which response includes all of the following that are oxidation-reducyion reactions and no others?

I. BaSO3 --> BaO + SO2
II. 2K + Br2 --> 2KBr
III. H2CO3 + Ca(OH)2 --> CaCO3 + 2H2O
IV. SnS2 + HCl --> H2SnCl6 + 2H2S
V. 3Cl2 + 6KOH --> 5KCl + KClO3 + 3H2O

a) II, III, and IV
b) I and III
c) II and V
d) I and IV
e) another one or another combination

KEY

1)d 2)c 3)b 4)e 5)a 6)c 7)c 8)b 9)c 10)d 11)a 12)b 13)e 14)a 15)c