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This question is about metals and alloys - AQA - GCSE Chemistry - Question 3 - 2015 - Paper 2
Question 3
This question is about metals and alloys. 3 (a) Explain how electricity is conducted in a metal. To gain full marks you must include a description of the structure ... show full transcript
Worked Solution & Example Answer:This question is about metals and alloys - AQA - GCSE Chemistry - Question 3 - 2015 - Paper 2
Step 1
Explain how electricity is conducted in a metal.
Answer
Electricity is conducted in a metal due to its unique structure and bonding characteristics. Metals consist of a giant structure composed of positive ions arranged in a closely packed lattice. The valence electrons in metals are delocalized, which means they are not bound to any specific atom and can move freely through the metal. This movement of electrons facilitates the flow of electric current, as these mobile electrons are able to carry charge throughout the metallic structure.
Step 2
Describe how the structure of an alloy is different from the structure of a pure metal.
Answer
An alloy is a mixture of different metals or a combination of metals and other elements. The structure of an alloy includes different types and sizes of atoms, resulting in distorted layers within its framework. In contrast, a pure metal has a uniform arrangement of identical atoms. This structural difference contributes to the enhanced properties of alloys, such as improved strength and resistance to corrosion.
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Step 6
How can the same reaction produce two different products?
Answer
The same reaction can produce two different products due to variations in conditions such as different temperatures, catalysts, or concentrations during the polymerization process, which influences the structure of the resulting poly(ethene).
Step 7
Give two reasons why instrumental methods of analysis are used to detect impurities in metals.
Answer
Instrumental methods of analysis are preferred for detecting impurities in metals because they are generally accurate and sensitive, allowing for the detection of very small amounts of impurities. This precision ensures quality control in metal production and recycling.