Final answer:
Copper has the highest specific heat, followed by lead and then iron, with each requiring different amounts of heat energy to change temperature.
Explanation:
The group of substances arranged in order of decreasing specific heat values is:
- Copper (highest specific heat)
- Lead
- Iron (lowest specific heat)
The rationale behind this arrangement is that substances with higher specific heat require more heat energy to raise their temperature, thus having a larger specific heat value.
Learn more about Specific Heat Values here:
https://brainly.com/question/31608647
