Agate is a variety of the mineral, quartz. Quartz is composed of silicon dioxide (SiO2), which is one part silicon for every two parts of oxygen. Which statement correctly describes the extended structure of quartz?

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility