8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Metallic Bonding and Conductivity 4 questions
Metallic Bonding and Conductivity
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
A model of metallic bonding shows positive ion cores held together by attraction to delocalized valence electrons.
Question 1
Which particles move through a solid metal to carry electric current in the model?
- Protons from the nuclei
- Delocalized electrons
- Neutral metal atoms
- Neutrons from the nuclei
Question 2
Explain how delocalized electrons help hold a metal together.
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Question 3
A metal strip bends without immediately breaking. Which description fits the metallic bonding model?
- The nuclei change into a different element.
- The delocalized electrons can still attract the cores as layers shift.
- All the electrons leave the strip.
- The metal must become an ionic solution.
Question 4
Explain why a solid ionic crystal and a solid metal can differ in electrical conductivity even though both contain charged particles.
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Comparing Conducting Strips 4 questions
Comparing Conducting Strips
Use the information below to answer the questions.
A lab records the resistance of three strips of the same length and cross-sectional area, measured at the same temperature. These are model readings. Lower resistance means better conductivity for these equal-sized strips.
| Strip material | Resistance (Ω) |
|---|---|
| Copper | 0.20 |
| Aluminum | 0.32 |
| Iron | 1.20 |
Question 5
Which strip conducts electricity best in this comparison?
- Copper
- Aluminum
- Iron
- All three conduct equally.
Question 6
How many times as great is the measured resistance of the iron strip as that of copper? Show your calculation.
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Question 7
Which change would make a new comparison harder to attribute to material alone?
- Keep all lengths the same.
- Use the same temperature for all strips.
- Use a thinner iron strip than the other strips.
- Repeat each measurement with the same meter.
Question 8
What mobile charge carriers allow both copper and iron to conduct? Give the measured resistance of each strip.
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