bubbles are given off near the surface of the manganese oxide, although it appears to
remain intact. Explain what happens and the role of the manganese oxide.- The following reactions were given in connection with the Solvay process used to
make sodium bicarbonate and sodium carbonate: (A) NaCl + NH 3 + CO 2 + H 2 O
→ NaHCO 3 (s) + NH 4 Cl, (B) 2NaHCO 3 + heat → Na 2 CO 3 + H 2 O(g) + CO 2 (g)
(C) 3H 2 + N 2 → 2NH 3 , (D) CaCO 3 + heat → CaO + CO 2 , (E) CaO + H 2 O →
Ca(OH) 2. Classify each of these reactions in the categories given in Section 4.6. - Given the chemical reaction 4CH 4 + 6NO 2 → 4CO + 3N 2 + 8H 2 O, write all the
possible mole ratios relating N 2 to each of the other reaction participants. - Given the atomic masses N 14.0, H 1.0, and Cl 35.5 and the reaction below, calculate
the mass of HCl produced when 12.7 g of NH 3 react.
2NH 3 + 3Cl 2 → N 2 + 6HCl- Given the atomic masses C 12.0, H 1.0, and O 16.0 and the reaction below, calculate
the mass of H 2 O produced when 15.6 g of O 2 react.
C 2 H 4 + 3O 2 → 2CO 2 + 2H 2 O - Match the reaction type from the list on the left with the example reaction from the
right, below. PbSO 4 is insoluble in water.
A. Decomposition 1. HCl + NaOH → H 2 O + NaCl
B. Neutralization 2. Pb(NO 3 ) 2 + Na 2 SO 4 → PbSO 4 + 2NaCl
C. Substitution 3. 2H 2 O 2 → 2H 2 O + O 2
D. Double displacement 4. CuSO 4 (aq) + Fe(s) → FeSO 4 (aq) + Cu(s)
and precipitate formation- Of the following, the untrue statement is
A. The symbol ←→ is used to show that a reaction goes both ways.
B. The notation (l) is used to show that a reactant or product is dissolved in
water.
C. A catalyst changes the rate of a reaction but is not itself consumed.
D. The symbol, ̈, is used to show application of heat to a reaction.
E. Simply because a chemical equation may be written and balanced does not
indicate for certain that the chemical reaction it indicates will occur.- Given the reaction 2S + 3O 2 → 2SO 2 and atomic masses of 32.0 and 16.0 for S
and O, respectively, calculate the mass of O 2 reacting with 15.0 g of S. - Given the reaction CH 4 + 2H 2 O → CO 2 + 4H 2 and atomic masses of C, 12.0,
H, 1.0; and O 16.0, calculate the total mass of products formed when 24.0 g of CH 4
reacts.
106 Green Chemistry, 2nd ed