What is anything that has mass and takes up space considered to be?

Which material burns faster? metal aluminum

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released