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Chapter 1: Problem 26

Brass is an alloy (a solid solution) of copper, Cu, and zinc, Zn. Given this fact, answer the following: (a) Copper powder and zinc powder are ground together. Is the resulting product a solution or a heterogeneous mixture? Explain. (b) The Cu and Zn powders are ground together, and then the mixture is heated until it is molten metal. Is the molten metal a solution or a heterogeneous mixture? Explain. (c) The molten metal from part (b) is allowed to cool and solidify. Is the resulting solid a solution or a heterogeneous mixture? Explain.

Short Answer

Expert verified
(a) The resulting product of ground copper and zinc powders is a heterogeneous mixture because the mixing of the powders does not create a uniform substance. (b) The molten metal obtained by heating Cu and Zn powders is a solution (alloy) due to the even distribution of atoms achieved through metallic bonding in the molten state. (c) The solid obtained after cooling and solidifying the molten metal is a solution (alloy) as the uniform distribution of atoms is maintained, resulting in brass.

Step by step solution

01

(a) Discussing the mixture of copper and zinc powders

When copper and zinc powders are ground together, the resulting product is a heterogeneous mixture. This is because the mixing of powders does not lead to the formation of a uniform substance. You can still differentiate between copper and zinc powders in the mixture since they did not undergo any chemical change.
02

(b) Classifying molten metal as a solution or heterogeneous mixture

When the copper and zinc powders are mixed and then heated until they form molten metal, a homogeneous mixture, or a solution, is created. In the molten state, the copper and zinc atoms become evenly distributed due to the metallic bonding. This homogeneous distribution resulting from the heating process forms a solution, which is called an alloy.
03

(c) Identifying the resulting solid as a solution or heterogeneous mixture

When the molten metal from part (b) is allowed to cool and solidify, the resulting solid is a solution, an alloy. The cooling process of the molten metal doesn't change its homogeneous distribution of atoms. Copper and zinc atoms remain uniformly distributed in the solid state, maintaining the properties of a solid solution. This alloy is also known as brass.

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Most popular questions from this chapter

All the metals in the first column of the periodic table react with water because they all have a single electron in their outermost occupied electron shell. This statement is an example of a scientific _____ .(law or theory)

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