Robert is hiking through the forest and writing down his observations. He steps on a branch and it breaks into several pieces. Which of the following best describes the resulting properties of the branch? O The density of the branch decreased, since it now takes up less space. o The molecular arrangement of the branch changed as the broken pieces changed phase. O The total mass of the branch pieces is the same, and only a physical change has occurred. O The chemical composition of the branch changed as the broken pieces reacted with the environment.
