Which describe chemical properties? 1. water freezes at 0 2. titanium is less dense than iron 3. mercury is a liquid at room temp 4 sugar burns in air to form water and carbon dioxide

The chemical properties of the substance are those that describe the changes it undergoes to form a new substance. On the other hand, the physical changes are those that describe the changing only the phases and other physical properties. From the choices, the answer is number "4. sugar burns in air to form water and carbon dioxide".