Final answer:
The correct answer is d) Change in phase, as it is indicative of a physical change, not a chemical change. Changes in color, gas production, and temperature are typical signs of chemical changes.
Step-by-step explanation:
When determining if a substance has undergone a chemical change, there are several signs to look for. Among those, change in color, the production of gas, and the change in temperature are typical signs that a chemical change has taken place. However, a change in phase, such as from solid to liquid or liquid to gas, is typically indicative of a physical change rather than a chemical change. Therefore, the correct answer to the question of which is NOT a typical sign of chemical change is d) Change in phase. Chemical changes often result in the formation of a new substance with different chemical properties, while physical changes involve changes in the state or appearance of the substance without changing its chemical identity.