Final answer:
The property dependent on the amount of copper particles in the sample, which Daryl is experimenting with, is mass. Electrical and thermal conductivity do not change with the amount of material, while density remains constant for a pure substance.
Step-by-step explanation:
When Daryl conducts experiments on samples of pure copper (Cu), and records both the physical and chemical properties of the metal, the property that is dependent on the amount of copper particles in the sample is mass. The electrical conductivity and thermal conductivity of copper are intrinsic physical properties, which means they do not depend on the amount of material present. In contrast, mass is an extrinsic property that changes directly with the amount of material. Density, while an intensive property, is a ratio of mass to volume and does not depend on the amount of copper if the sample is pure and in a uniform state. The property that is dependent on the amount of copper particles in the sample is C) Mass.
Electrical and thermal conductivity are intrinsic properties of the material and depend on the nature and arrangement of the atoms or particles, not their quantity. These properties are generally considered intensive properties and are independent of the amount of substance present.
Density, on the other hand, is dependent on both mass and volume. The mass of a substance is directly proportional to its density. Therefore, as the amount of copper particles (mass) in the sample changes, the density of the sample will also change.
So, in this case, the property that directly depends on the amount of copper particles is the mass of the sample.