8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Metallic Alloys and Material Properties 4 questions
Metallic Alloys and Material Properties
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
A substitutional alloy model has some atoms of a second element in places that would otherwise contain atoms of the main metal.
Question 1
What change produces a substitutional alloy in the model?
- Some main-metal atoms are replaced by atoms of a second element.
- Every atom loses its nucleus.
- The metal atoms separate into individual molecules of water.
- All atoms of the second element stay outside the solid.
Question 2
Explain how atoms of different sizes can make an alloy harder to deform than the pure metal in this model.
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Question 3
Which measurement most directly compares resistance to a permanent indentation?
- Electrical current at fixed voltage
- Indentation size under a specified test load
- Water volume in a container
- The total number of samples
Question 4
Explain why the composition alone does not establish whether an alloy meets a conductivity requirement.
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Choosing a Contact Material 4 questions
Choosing a Contact Material
Use the information below to answer the questions.
A model compares pure copper and two copper alloys. A contact needs a hardness score of at least 60 and a relative conductivity of at least 75. Higher values are preferred within each property.
| Material | Zinc (% by mass) | Hardness score | Relative conductivity |
|---|---|---|---|
| P | 0 | 45 | 100 |
| Q | 5 | 68 | 85 |
| R | 15 | 82 | 67 |
Question 5
Which material meets both requirements?
- P only
- Q only
- R only
- Q and R
Question 6
Use the data to explain the tradeoff when changing from Q to R.
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Question 7
How many more conductivity units would R need to meet the stated minimum?
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Question 8
If the minimum hardness is reduced to 40 while conductivity must still be at least 75, which materials meet both limits?
- P and Q
- P and R
- Q and R
- All three
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