How could you decide whether a ring was 24-karat gold or 14-karat gold without damaging the ring?

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

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An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.