Question 27
The charts show the elements iron and sulfur and their properties. The arrows indicate that they may form either an iron-and-sulfur mixture or the compound iron sulfide.
| Element | Properties |
|---|---|
| Iron | magnetic, black |
| Sulfur | nonmagnetic, yellow |
Physical change → mixture: partially magnetic, black and yellow. Chemical change → iron sulfide compound: nonmagnetic, shiny, gray.
What evidence indicates that a chemical change took place when the iron and sulfur combined to form iron sulfide?
| Element | Properties |
|---|---|
| Iron | magnetic, black |
| Sulfur | nonmagnetic, yellow |
Physical change → mixture: partially magnetic, black and yellow. Chemical change → iron sulfide compound: nonmagnetic, shiny, gray.
What evidence indicates that a chemical change took place when the iron and sulfur combined to form iron sulfide?