What is the density of an object with a mass of 8.7 g and a volume of 8.6 cm??

Which material burns faster? metal aluminum

Which of the following words describe the reality that the universe looks the same from various perspective

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o