Final answer:
Copper powder does not behave like iron powder when heated together, as each metal has distinct chemical properties and reactivity. Iron, being more reactive, participates in different chemical reactions compared to copper.
Step-by-step explanation:
The statement that copper powder behaves like iron powder when it is mixed and heated together in a test tube is false. When copper and iron powders are heated together, they do not behave the same way due to differences in reactivity and the chemical properties of these metals. Iron is more reactive than copper, so it will more readily participate in chemical reactions, such as oxidation. If these powders were heated together, they might form different products based not only on their chemical properties but also due to how they interact with each other and with any other substances present, like oxygen.
For example, if a copper sulfate crystal is heated over a Bunsen burner, it undergoes a chemical change where water is driven off, and a color change can be observed. Similarly, if zinc metal is mixed with copper ions, a spontaneous reaction occurs where zinc will replace the copper ions, forming zinc ions and copper metal due to the difference in their activity levels.
Binary compounds like copper (I) chloride are not malleable like pure metals, and they cannot be worked into useful shapes like a copper plate because they tend to fracture and turn into a powder upon impact.