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True or False. 4. The maximum number of phases of a single substance which can c

ID: 844712 • Letter: T

Question

True or False.

4.

The maximum number of phases of a single substance which can coexist in equilibrium is two.

5.

The energy of a hydrogen bond is greater than that of a typical covalent bond.

6.

Only molecules which do not have dipole moments can experience dispersion forces.

7.

The surface tension of water is lowered when a detergent is present in solution.

8.

In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases.

9.

Ionic crystals are composed of charged spheres that are held together by covalent bonds.

10.

Solids are most stable in crystalline form.

11.

A face-centered crystal lattice has one atom in the center of the crystal.

12.

Molecular crystals are held together by the cohesive forces of dispersion and dipole-dipole forces and by hydrogen bonding.

4.

The maximum number of phases of a single substance which can coexist in equilibrium is two.

Explanation / Answer

4.

The maximum number of phases of a single substance which can coexist in equilibrium is two : False its 3

5.

The energy of a hydrogen bond is greater than that of a typical covalent bond. True

6.

Only molecules which do not have dipole moments can experience dispersion forces. False

7.

The surface tension of water is lowered when a detergent is present in solution.False it is increased

8.

In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases. True (packing efficiency and co ordibation no are directly related)

9.

Ionic crystals are composed of charged spheres that are held together by covalent bonds. False (ionic crystals are held together by electrovelnt bonds)

10.

Solids are most stable in crystalline form. True (higher packing efficiency)

11.

A face-centered crystal lattice has one atom in the center of the crystal. False (that is body centerd cubic lattice)

12.

Molecular crystals are held together by the cohesive forces of dispersion and dipole-dipole forces and by hydrogen bonding. True

4.

The maximum number of phases of a single substance which can coexist in equilibrium is two : False its 3

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