Practice Exercise. A closed steel reaction flask is initially filled with 1.75 mol of nitrogen gas at a pressure of 3.00 atm at 30 °C. After some of the nitrogen gas was allowed to escape, the final pressure

was 1.50 atm at 25 °C. Calculate the mols of nitrogen gas that escaped. ( 0.860 mols )

Label a-f based on the table using c for concentrated and d for dilute

Type the letter that represents the correct location for each particle type below. the neutron is found at __ the electron is found at __ the proton is found at __

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?