Explain how you would obtain a pure sample of copper powder from a mixture of copper (ii) oxide and copper powders?

To obtain a pure sample of copper powder from a mixture of copper (II) oxide and copper powders, you can use the following steps:

1. Begin by heating the mixture of copper (II) oxide and copper powders in a crucible. The heat will cause the copper (II) oxide to decompose into copper metal and oxygen gas.

2. As the mixture is heated, the copper (II) oxide will react with the copper powders to form pure copper metal. The oxygen gas will be released as a byproduct.

3. Continue heating the mixture until all of the copper (II) oxide has been reduced to copper metal. This can be confirmed by observing the color change from black (copper (II) oxide) to reddish-brown (copper metal).

4. Once the reaction is complete, allow the crucible to cool. The pure copper powder can then be separated from any remaining impurities by carefully pouring off the excess liquid and rinsing the copper powder with distilled water.

5. Finally, dry the pure copper powder thoroughly before storing it in a clean, dry container for future use.

By following these steps, you can obtain a pure sample of copper powder from a mixture of copper (II) oxide and copper powders.