How much heat is needed when 2.47 g sand, SiO2, is heated from 17.1 °C to 46.7°C

Which is true of a liquid? it has a definite volume but not a definite mass.it has a definite mass but not a definite volume.it has a definite volume but not a definite shape.it has a definite shape but not a definite volume.

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n

Describe the process that was used in this lab to create magnesium oxide, specifically identifying the type of chemical reaction. explain why the product had a higher mass than the reactant, and how this relates to conservation of matter.