A graduated cylinder contains 100.0 mL of water. An irregularly shaped object is placed in
the cylinder, and the water level rises to the
250.0 mL mark. If the object has a mass of
450 g, what is the density?

3 g/mL

Explanation:

density is mass divided by volume

The mass of the object is 450g, and the volume is 150mL (the water level changes by 150mL).

450g/150mL = 3 g/mL

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.