General Chemistry: Atoms First
Chapter 6 Chemical Arithmetic: Stoichiometry
6.1 Multiple Choice Questions
1) Which one of the following statements
... [Show More] about balanced equations is false? In a balanced reaction
A) atoms must be balanced on both sides of the reaction arrow.
B) mass must be conserved.
C) molecules must be balanced on both sides of the reaction arrow.
D) net charge must be balanced on both sides of the reaction arrow.
2) Which one of the following statements about balanced equations is true? A reaction is balanced by
A) changing the charge on an ion.
B) changing the formula of the molecule.
C) multiplying by suitable coefficients.
D) rearranging atoms in a molecule.
3) What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients
C3H8O(l) + O2(g) → CO2(g) + H2O(l)
A) 3
B) 5
C) 7
D) 9
4) What is the sum of the coefficients when the following equation is balanced using the lowest, whole numbered coefficients?
PH3(g) + O2(g) → P4O10(s) + H2O(g)
A) 10
B) 12
C) 19
D) 22
5) What is the sum of the coefficients when the following equation is balanced using the lowest, whole numbered coefficients?
B2O3(s) + HF(l) → BF3(g) + H2O(l)
A) 8
B) 11
C) 15
D) none of these
6) Aluminum metal reacts with iron(II) sulfide to form aluminum sulfide and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?
A) 1
B) 2
C) 3
D) 4
7) Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?
A) 1
B) 2
C) 3
D) none of these
8) Given the chemical equation: N2 + 3 H2 → 2 NH3. On a microscopic level, what do the coefficients mean?
A) 1 atom of nitrogen reacts with 3 atoms of hydrogen to give 2 atoms of ammonia.
B) 28 g of nitrogen reacts with 6 grams of hydrogen to give 34 grams of ammonia.
C) 1 mole of nitrogen reacts with 3 moles of hydrogen to give 2 moles of ammonia.
D) 1 molecule of nitrogen reacts with 3 molecules of hydrogen to give 2 molecules of ammonia.
9) Given the chemical equation: N2 + 3 H2 → 2 NH3. On a macroscopic level, what do the coefficients mean?
A) 1 atom of nitrogen reacts with 3 atoms of hydrogen to give 2 atoms of ammonia.
B) 1 mole of nitrogen reacts with 3 moles of hydrogen to give 2 moles of ammonia.
C) 1 molecule of nitrogen reacts with 3 molecules of hydrogen to give 2 molecules of ammonia.
D) all of the above
10) 1.00 mole of O2 contains the same number of molecules as
A) 0.667 mole of O3.
B) 1.00 mole of CH3CO2H.
C) 2.00 mole of CH3CH2OH.
D) all of the above.
11) 1.00 mole of O2 contains the same number of oxygen atoms as
A) 0.667 mole of O3.
B) 1.00 mole of CH3CO2H.
C) 2.00 mole of CH3CH2OH.
D) all of the above.
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