Chemistry 2nd Exam Practice
Cl- (Option A)
Based on Coulomb's law and the information in the table at left, which of the following anions is most likely to have the strongest interactions with nearby water molecules in an aqueous solution?
Option B
Steel is an alloy consisting of Fe with a small amount of C. Elemental Cr can be added to steel to make the steel less likely to rust; Cr atoms react with oxygen in the air to form a nonreactive layer of chromium oxide on the surface of the steel, preventing the oxidation of underlying Fe atoms. A sample of steel-chromium alloy contains 15 percent Cr by mass. Which of the following diagrams best shows a particle-level view of a surface section and an interior section of the alloy represented above? (The atomic radii of the atoms involved are given in the table above.)
The silicon-to-germanium bond is nonpolar covalent. (Option B)
The elements Si and Ge have the same electronegativity value, 1.4. Which of the following claims about the compound that forms from Si and Ge is most likely to be true?
Mg2+ (g) and O2- (g) (Option C)
The lattice energy of a salt is related to the energy required to separate the ions. For which of the following pairs of ions is the energy that is required to separate the ions largest? (Assume that the distance between that ions in each pair is equal to the sum of the ionic radii.)
The attractice and repulsion forces are balanced, so the atoms will maintain an average internuclear distance x. (Option A)
The potential energy of a system of two atoms as a function of their internuclear distance is shown in the diagram at left. Which of the following is true regarding the forces between the atom when their internuclear distance is x?
Network covalent, Metallic, Ionic (Option D)
Three substance were studied in the laboratory, and the data in the table above were collected. Based on the data, which of the following shows the type of bonding in each substance?
It contains ionic bonds. (Option C)
Two pure elements react to form a compound. One element is an alkali metal, X, and the other element is a halogen, Z. Which of the following is the most valid scientific claim that can be made about the compound?
Nonpolar covalent
What type of chemical bond is present in I2 molecule?
The atoms forms a bond with a bond length of 75 pm. (Option B)
Which of the following can be inferred from the diagram at right that shows the dependence of potential energy on the internuclear distance between two atoms.
H-F > N-F > F-F (Option A)
Which of the following has the bonds arranged in order of decreasing polarity
It is brittle, water-soluble electrolyte that is a poor thermal and electrical conductor as a solid. (Option C)
Which of the following most likely describes the solid represented in the diagram above?
The bond is highly polar. (Option D)
Which of the following scientific claims about the bond in the molecular compound HF is most likely to be true?
CaCl2 (Option C)
Which of the following substances has bonds with the greatest ionic character?