Download Chem 121 QU 34 Due in lecture

Chem 121 QU 34 Due in lecture: Name_______________________________________ page 1/2
DIRECTIONS: Write the correct answers in the appropriate blanks. Round – off problem answers
(but not numbers within a problem) to 3 significant figures. Write units. Text: CHEMISTRY A
molecular approach (2nd Ed.) by Tro.
1. Complete the table below from the information given:
Formula1
+ ion 2
- ion 3
Read the footnotes.
Compound name 4
NA = Not Applicable
Compound type5
Ca(NO3)2
XeO3
SF4
NA
NA
K+
CO32-
NA
NA
NA
NA
Dinitrogen oxide
Ammonium phosphate
CH3CH3
NA
NA
Magnesium chloride
Cu+
F-
Cu2+
F1. Write the formula of the compound (NaCl, etc.).
2. Write the formula of the cation (positive ion).
3. Write the formula of the anion(negative ion).
4. Write the name of the compound (Sodium chloride, etc.)
5. Write the type of compound (either ionic or covalent)
2. Balance the following equations: A blank space is assumed to be 1.
_____ Cu2S
+
_____O2
→
_____ Cu2O
_____ Bi2O3
+
_____C
→
_____Bi
_____H2O
→
_____H2SO4
_____ SF6
+
+
+
_____ SO2
_____ CO
+
_____ HF
3. Solve the following problem from pages 172-175.
50 → percent yield=___________________
54c →_________________________________
56c →___________________________________
68b →_________________________________
88e →_________________________________
Chem 121
QU 34 Due in lecture:
page 2/2
4. Answer the 5 questions concerning the following UNBALANCED equation:
_____ H+
+ ____ Zn
+ ____NO3-
→
_____ Zn2+
+
____NH4+
+ ____H2O
→ Write coefficients in the banks to balance the equation↑:
→ ______ Write the correct oxidation number for the Zn atom.
→ ______ Write the correct oxidation number for N in NH4+. Include the electric charge and sign.
→_______ Write the formula of the oxidizing agent.
→_______ Write the symbol of the element oxidized.
5. Answer the next 3 questions using the following: methyl ethanoate is 48.6% C, 8.1% H, and oxygen.
The molar mass of methyl ethanoate 74 g/mol.
→_____________ Calculate the % O.
→_____________________ Determine and write the empirical formula for methyl ethanoate.
→_____________________ Determine and write the molecular formula for methyl ethanoate.
6. Answer the next 2 questions using the following: Potassium chlorate (KClO3) decomposes to produce
potassium chloride and oxygen gas.
→___________________________________________________________________________________
Write and balance the chemical equation on the above line. ↑
→________________________ Calculate the mass of potassium chlorate necessary to produce 2.10 mol of
oxygen gas.
7. Answer the next 4 questions using the following: Sulfuric acid reacts with ammonium hydroxide to form
ammonium sulfate and water.
→[ precipitate
neutralization
redox ] ←Circle the type of reaction.
→___________________________________________________________________________________
Write and balance the molecular equation on the above line. ↑
→___________________________________________________________________________________
Write and balance the complete ionic equation on the above line. ↑
Cross-out the spectator ion(s).
→___________________________________________________________________________________
Write and balance the net ionic equation on the above line. ↑
8. Solve the following problems from pages 120 - 125:
38g →_________________________________
38h →___________________________________
50b →_________________________________
50e →___________________________________