The true statement among the options provided is:
The density of a material may differ as it changes state.
When materials change states (e.g., from solid to liquid to gas), their density can change significantly. For example, ice (solid water) is less dense than liquid water, which is why ice floats.
The other statements have issues:
- "All physical properties depend on how much material you have" is not true for intrinsic properties like density, which is a ratio of mass to volume.
- "Changing the state of a material from solid to gas, for example, generally makes the material more dense" is incorrect; typically, gas is less dense than solid.
- "Some physical properties, like mass, volume, and density, depend on how much material you have" is partially true, as mass and volume do depend on the amount of material, but density is an intensive property that does not depend on the amount of material.