The atom is a basic unit of matter that consists of a central nucleus surrounded by a cloud of negatively charged electrons. Positively charged nucleus is surrounded and neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus. The electrons in atoms are structured as shells. The outer shell is the one involved in molecular structure. Dipole-dipole interactions are weaker than London forces? Boiling points depend on the polarizability? Ethyl alcohol is soluble in water due to hydrogen bonding? Ice is good conductor of heat and electricity? Evaporation does not depend on surface area?
Vapor pressure depends upon the amount of liquid? One atmosphere is equal to 760 torr? Boiling point of water is less than 1000C in pressure cooker? Liquid crystals are always isotropic? Particles have fixed positions in solids? Particles in a solid are motionless? Amorphous solids have sharp melting points? Polymorphs have same physical properties but differ in chemical properties? Two crystalline forms of the same substance can co-exist in equilibrium with each other?
Electron gas theory was the first theory of metallic bonding? Rigidity and tensile strength in thread making materials is because of ____________? Tetragonal crystals have two axes equal and third one different while measure of angles is ___________? __________ is the temperature at which two crystalline forms co-exist in equilibrium? If a physical or chemical change takes place at constant pressure, heat change during the process is called? ___________?