At 20.°c, a 1.2-gram sample of mg ribbon reacts rapidly with 10.0 milliliters of 1.0 m hcl(aq). which change in conditions would have caused
the reaction to proceed more slowly?
(1) increasing the initial temperature to 25°c
(2) decreasing the concentration of hcl(aq) to 0.1 m
(3) using 1.2 g of powdered mg
(4) using 2.4 g of mg ribbon

The allotropes of carbon include a variety of structures that include three-dimensional tetrahedral lattices, planes of hexagonal rings, cylindrical tubes of hexagonal rings, and spheres of five- and six-membered rings. similar shapes of network covalent atomic solids are possible with carbon nitride, boron, and pure silicon (e.g., silicene is a graphene-like allotrope of pure silicon). in contrast, silicates exist as either highly ordered or amorphous (more random) three-dimensional lattices. what could explain why there are there no naturally occurring sheets, stacked sheets, cylindrical tubes, or spheres of network covalent atomic solids composed of silicon and oxygen (sio2)? would pure silicate structures make good lubricants or good electrical conductors?