Question 1: What are delocalized electrons in the context of metallic bonding?

Answer: Delocalized electrons are electrons that are not bound to a specific atom but are free to move throughout the metallic structure, forming a 'sea of electrons'.

Question 2: Explain how delocalized electrons contribute to the electrical conductivity of metals.

Answer: Delocalized electrons can move freely within the metal, allowing electric current to pass through easily, which makes metals good conductors.

Question 1: Define metallic bonding and describe the role of delocalized electrons in this type of bonding.

Answer: Metallic bonding is a type of chemical bonding where metal atoms release some of their electrons to form a 'sea of electrons' that are free to move around. These delocalized electrons hold the metal ions together and give metals their characteristic properties such as conductivity and malleability.

Question 2: List two properties of metals that are directly explained by the presence of delocalized electrons.

Answer: Electrical conductivity and malleability.

Question 1: Calculate the number of delocalized electrons in a copper atom, given that copper has an atomic number of 29 and typically contributes 1 electron to the 'sea of electrons'.

Answer: 1 electron per atom (since copper contributes 1 delocalized electron).

Question 2: If a metal sample contains 2.5 x 10^21 atoms, estimate the total number of delocalized electrons in the sample.

Answer: 2.5 x 10^21 electrons (assuming 1 delocalized electron per atom).

Question 1: Describe a simple experiment to demonstrate the electrical conductivity of a metallic sample. Include the main variables involved and safety precautions.

Answer: One experiment involves connecting a metal wire to a battery and a light bulb to test conductivity. The main variables are the type of metal (independent variable) and the brightness of the bulb (dependent variable). Safety precautions include ensuring connections are secure to prevent short circuits and handling electrical equipment carefully to avoid shocks.

Question 1: A new alloy is developed for use in electrical wiring. It contains a blend of metals with varied numbers of delocalized electrons. What property of the alloy would you expect to be enhanced as a result, and why?

Answer: The electrical conductivity of the alloy would likely be enhanced because a greater number of delocalized electrons can increase the flow of electric current throughout the material.

Question 2: Explain how the concept of delocalized electrons is important in the development of flexible electronic devices such as bendable screens.

Answer: Delocalized electrons allow metals and conducting materials to remain conductive even when bent or deformed, enabling the development of flexible electronic devices that can bend without losing their conductive properties.