뒤로
- Arrange the following oxides in order of increasing acidic character: BaO, Cl2O7, SO3, SnO2.
문제 127
- Which is more acidic? (a) Cr2O3 or CrO3 (b) N2O5 or N2O3 (c) SO2 or SO3
문제 128
- Which is more basic? (a) CrO or Cr2O3 (b) SnO2 or SnO (c) As2O3 or As2O5
문제 129
- Write a balanced net ionic equation for the reaction of each of the following oxides with water: (a) BaO (b) Cs2O (c) N2O5.
문제 131
- Write a balanced net ionic equation for the reaction of the amphoteric oxide ZnO with aqueous sodium hydroxide. [The product is Zn(OH)4^2-.]
문제 132
- Write a balanced net ionic equation for the reaction of the amphoteric oxide Ga2O3 with aqueous potassium hydroxide (KOH). [The product is Ga(OH)4-.]
문제 133
문제 134
Describe the structure of the sulfur molecules in:
(a) Rhombic sulfur (b) Monoclinic sulfur(c) Plastic sulfur (d) Liquid sulfur above 160 °C
- The viscosity of liquid sulfur increases sharply at about 160 °C and then decreases again above 200 °C. Explain.
문제 135
- Write a balanced net ionic equation for each of the following reactions. (a) Zn(s) + dilute H2SO4(aq) → ? (b) BaSO3(s) + HCl(aq) → ? (c) Cu(s) + hot, concentrated H2SO4(l) → ? (d) H2S(aq) + I2(aq) → ?
문제 136
- Write a balanced net ionic equation for each of the following reactions. (a) ZnS(s) + HCl(aq) → ? (b) H2S(aq) + Fe(NO3)3(aq) → ? (c) Fe(s) + dilute H2SO4(aq) → ? (d) BaO(s) + H2SO4(aq) → ?
문제 137
문제 138a
Account for each of the following observations.
(a) H2SO4 is a stronger acid than H2SO3.
문제 138b
Account for each of the following observations.
b. SF4 exists, but OF4 does not.
- Account for each of the following observations: (a) Oxygen is more electronegative than sulfur. (b) Sulfur forms long Sn chains, but oxygen does not.
문제 139
- (b) Why is the S8 ring nonplanar?
문제 141
- Fuming sulfuric acid is formed when sulfur trioxide dissolves in anhydrous sulfuric acid to form H2S2O7. Propose a structure for H2S2O7, which contains an S - O - S linkage.
문제 143
문제 144
Little is known about the chemistry of astatine (At) from direct observation, but reasonable predictions can be made.
(a) Is astatine likely to be a gas, a liquid, or a solid?
- Why does chemical reactivity decrease from top to bottom in group 7A?
문제 145
- The element bromine was first prepared by oxidation of aqueous potassium bromide with solid manganese(IV) oxide. Write a balanced net ionic equation for the reaction in an aqueous acidic solution. Mn2+ is also formed.
문제 146
- The first preparation of chlorine was similar to the synthesis of elemental bromine (Problem 22.146). A later method entailed the reaction of hydrogen chloride and oxygen at 400 °C. Write a balanced equation for the reaction. (Water is also formed.)
문제 147
- Reaction of titanium and chlorine at 300 °C yields a metal halide that is 25.25% Ti by mass. The melting point (124 °C) and boiling point (136 °C) of the halide suggest it is a molecular compound rather than an ionic one. (a) What are the formula and name of the compound, assuming the molecular formula is the same as the empirical formula? (b) Write the balanced equation for the reaction.
문제 148
- Niobium reacts with fluorine at room temperature to give a solid binary compound that is 49.44% Nb by mass. (a) What is the empirical formula of the compound? (b) Write a balanced equation for the reaction.
문제 149
문제 149a,b
Niobium reacts with fluorine at room temperature to give a solid binary compound that is 49.44% Nb by mass. (a) What is the empirical formula of the compound? (b) Write a balanced equation for the reaction.
문제 149c
Niobium reacts with fluorine at room temperature to give a solid binary compound that is 49.44% Nb by mass.
(c) The compound reacts with hydrogen to regenerate niobium. Write a balanced equation for the reaction.
- Write the formula for chlorous acid and indicate the oxidation state of the halogen.
문제 151
- Write an electron-dot structure for each of the following molecules or ions and predict the geometrical structure: (a) HIO3 (b) ClO2- (c) HOCl (d) IO6^5-
문제 152
- Write an electron-dot structure for each of the following molecules or ions, and predict the geometrical structure: (a) BrO4- (b) ClO3- (c) HIO4 (d) HOBr.
문제 153
- Explain why acid strength increases in the order HClO 6 HClO2 6 HClO3 6 HClO4.
문제 154
- Explain why acid strength increases in the order HIO < HBrO < HClO.
문제 155
- Iodine forms the acid anhydride I2O5. Write a balanced equation for the reaction of this anhydride with water, and name the acid that is formed.
문제 156
문제 157
Chlorine reacts with molten sulfur to yield disulfur dichloride, a yellowish-red liquid. Propose a structure for disulfur dichloride.