1. the substance is a solid at point _____\nf\nb\nd\na
1. the substance is a solid at point _____\nf\nb\nd\na
Answer
Explanation:
Step1: Analyze phase - change graph
On a temperature - time graph for a substance, the solid phase is before the melting point.
Step2: Identify solid - phase point
At point A, the substance has not yet started to melt and is in the solid phase. Points B and C are during the melting process (solid - liquid co - existence), point D is after melting (liquid phase), and point F is also in a non - solid phase.
Answer:
A. A