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- Compare some of the physical properties of TiH1.7, HCl, and CaH2.
Problem 61
Problem 62a
Describe the molecular geometry of:
(a) H2Se
Problem 62b
Describe the molecular geometry of:
(b) AsH3
Problem 62c
Describe the molecular geometry of:
(c) SiH4
- Describe the molecular geometry of: (a) GeH4 (b) NH3 (c) H2S
Problem 63
Problem 64
What is a nonstoichiometric compound? Give an example, and account for its lack of stoichiometry in terms of structure.
Problem 65
Explain why the hydrogen atoms in interstitial hydrides are mobile.
- Write a balanced net ionic equation for the reaction of each of the following hydrides with water: (b) NH3.
Problem 66
- Write a balanced net ionic equation for the reaction of each of the following hydrides with water: (a) HI (b) KH.
Problem 67
Problem 68
Look at the properties of the alkali metals summarized in
Table 22.2, and predict reasonable values for the melting
point, boiling point, density, and atomic radius of francium.
- Why does chemical reactivity increase from top to bottom in groups 1A and 2A?
Problem 69
- The industrial production of hydriodic acid takes place by treatment of iodine with hydrazine (N2H4): 2 I2 + N2H4 --> 4 HI + N2 (a) How many grams of I2 are needed to react with 36.7 g of (N2H4)?
Problem 70
Problem 70
Write chemical equations for the reaction of potassium with the following substances, making sure that the numbers and kinds of atoms are the same on both sides of the equations. If no reaction occurs, write N.R.
(a) H2O
- Write chemical equations for the reaction of calcium with the following substances, ensuring that the numbers and kinds of atoms are the same on both sides of the equations. If no reaction occurs, write N.R. (a) H2O (b) He
Problem 71
Problem 71c
Write chemical equations for the reaction of calcium with the following substances, making sure that the numbers and kinds of atoms are the same on both sides of the equations. If no reaction occurs, write N.R.
(c) Br2
Problem 71d
Write chemical equations for the reaction of calcium with the following substances, making sure that the numbers and kinds of atoms are the same on both sides of the equations. If no reaction occurs, write N.R.
(d) O2
- Complete the following equations so that the same numbers and kinds of atoms appear on both sides of the reaction arrow. If no reaction takes place, write N.R. (a) Cs(s) + H2O(l) → ? (b) Rb(s) + O2(g) → ?
Problem 72
- Predict the products of the following reactions, and balance the equations so that the numbers and kinds of atoms are the same on both sides of the reaction arrows. (a) Be(s) + Br2(l) → ? (b) Sr(s) + H2O(l) → ? (c) Mg(s) + O2(g) → ?
Problem 73
Problem 74
Milk of magnesia, a widely used antacid, is an aqueous suspension of Mg1OH22. How would you prepare Mg1OH22 from magnesium metal?
- Magnesium metal is produced by the electrolysis of molten magnesium chloride using inert electrodes. Predict the anode reaction, cathode reaction, and overall cell reaction.
Problem 76
- How many hours are required to produce 10.0 kg of magnesium by electrolysis of molten MgCl2 with a constant current of 1.00 * 10^4 A? How many liters of Cl2 at STP will be obtained?
Problem 77
- Assign charges to the oxygen-containing anions in the following compounds: (a) Na2O (b) K2O2
Problem 78
- Assign charges to the oxygen-containing anions in the following compounds: (a) CsO₂ (b) BaO₂
Problem 79
Problem 80a
Identify the group 3A element that best fits each of the following descriptions.
(a) Is the most abundant element of the group
Problem 80b
Identify the group 3A element that best fits each of the following descriptions.
(b) Is stable in the +1 oxidation state
Problem 80c
Identify the group 3A element that best fits each of the following descriptions.
(c) Is a semiconductor
Problem 81
Identify the group 3A element that best fits each of the following descriptions.
(a) Has an unusually low melting point
Problem 82
What is the most common oxidation state for each of the
group 3A elements?
- What is the oxidation state of the group 3A element in each of the following compounds? (a) NaBF4 (b) GaCl3 (c) TlCl (d) B2H6
Problem 83
Problem 86a
(a) Describe what is meant by an electron-deficient molecule.