How do ionic bonds affect the properties of ionic compounds?

the bonds weakly hold ions together, increasing the melting point.
the bonds strongly hold ions together, reducing the boiling point.
the bonds prevent ions from moving throughout the crystal, so a solid ionic compound is a poor conductor.
the bonds prevent electrons from moving throughout the crystal, so a solid ionic compound is a poor conductor.

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

What human activity increases beach erosion?

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.