Answer
a. mixture; physical change
b. compound; chemical change
c. mixture; physical change
Work Step by Step
a. Distillation is a physical separation method. It separates components of a mixture based on differences in boiling points. No new substances are formed. So the material is a mixture and it suffers a physical change.
b. A single substance breaks down into two very different substances (gas + metal). This indicates a compound decomposing into its elements. Since new substances are formed, it’s a chemical change.
c. Sugar dissolves in tea, but its chemical structure remains the same. This is a mixture (tea + sugar solution). Dissolving is a physical change.
