idk

When a stress is applied to an ionic crystal, the planes of the ions slide and seperate due to the alignment of like charges, as shown in the diagram above. Which of the following characteristics of the crystal is represented by the observation

Brittleness

On the basis of information above, which of the following arranges the binary compounds in order of increasing bond polarity?

CH4 < SiCl4 < SF4

PCl3, Cl2, CaCl2 Which of the following correctly ranks the substances listed above in order of increasing ionic character in their bonding?

Cl2, PCl3, CaCl2

To make Au stronger and harder, it is often alloyed with other metals, such as Cu and Ag. Consider two alloys, one of Au and Cu and one of Au and Ag, each with the same mole fraction of Au. If the Au/Cu alloy is harder than the Au/Ag alloy, then which of the following is the best explanation based on the information in the table above?

Cu atoms are smaller than Ag atoms, thus they interfere more with the displacement of atoms in the alloy

The melting point of mgO is higher than that of NaF. Explanations for this observation include which of the following I. Mg is more postively charged than Na II. O is more negatively charged than F III. The O ion is smaller than the F ion

I and II only

The lattice energy of a salt is related to the energy required to seperate the ions. For which of the following pairs of ions is the energy that is required to seperate the ions largest? (assume that the distance between the ions in each pair is equal to the sum of the ionic radii)

Mg (g) and O (g)

Which of the following compounds contains both ionic and covalent bonds?

NH4Cl

based on the data in the tables above, which of the following statements provides the best precidtion for the boiling point of NaCl?

NaCl will have a lower boiling point than NaF because the coulmbic attractions are weaker in NaCl than in NaF

of the following single bonds, which is the LEAST polar?

O--F

The table above shows the melting points of MgO (s) and NaF(s). Which of the following best helps explain why the melting point of MgO is much higher than that of NaF

The charges of Mg and O ions are greater than those of Na and F ions

The energy required to dissociate an ionic solid into gaseous ions (lattice energy) for the compounds NaF and MgF2 is shown in the table above. On the basis of Columb's law, which of the following best helps to explain the large difference between the lattice energies of NaF and MgF

the charge of the Mg cation is larger than that of the Na cation