Final answer:
Setting an inflated balloon on fire is a chemical change that results in the formation of new substances. Deflating a balloon and changing its shape through twisting are physical changes.
Step-by-step explanation:
Setting an inflated balloon on fire represents a chemical change, as it involves a combustion reaction wherein the balloon material reacts with oxygen in the air to produce heat, light, and new substances. This change is different from the rest because it results in the formation of new substances with different properties.
Deflating a balloon by releasing all the air present in it represents a physical change, as the air molecules are simply being allowed to escape, causing a decrease in volume. Twisting a long balloon to change its shape to form a flower also represents a physical change, as the balloon material is simply being manipulated without any chemical reactions occurring.
Learn more about Types of changes (physical and chemical) in balloons