The anteroposterior full-spine films (Fig. 6.38) exhibit several lateral flexion-type subluxations (C-3) and a rotational type at the level of L5 (C-4). This patient presented with a history of acute pain in the left lateral rib cage about the level of the 3rd and 4th ribs.
paper burning is a chemical change. technically any chemical change is also a physical change, but not every physical change is a chemical change. It is a chemical change. When you burn paper, you see smoke and ash being formed, indicating a chemical change.
For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change - you can't 'unburn' it. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances.