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Investigating a Metal Hinge Fragment 5 questions
Investigating a Metal Hinge Fragment
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A school theater is replacing old metal hinges. Students receive simulated measurements from two separated metal samples. Each signal in the table identifies atoms with a particular proton count and mass number. Signal share is the percent of measured atoms in that sample.
| Sample | Protons per atom | Mass number | Signal share (%) |
|---|---|---|---|
| H | 28 | 58 | 70 |
| H | 28 | 60 | 30 |
| J | 27 | 59 | 100 |
Question 1
Use the periodic table. Which element accounts for both signals from sample H?
- Co
- Ni
- Cu
- Fe
Question 2
Explain how the two signals from H can have different mass numbers even though they come from the same element. Include the two neutron counts.
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Question 3
Approximate the mass of each isotope by its mass number in atomic mass units. Use the signal shares to estimate the average mass of a measured atom from H. Show your setup.
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In a separate measurement, an ion from H and an ion from J are each found to have 26 electrons. A student concludes that the ions must be from the same element.
Question 4
Use the measurements to evaluate the student’s conclusion.
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Question 5
What are the charges of the measured ions from H and J, respectively?
- +1 and +2
- +2 and +1
- −2 and −1
- +2 and +2
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