Question

question 3

1. look at the chart below. based on the chart, which substance is a pure substance?

substance	can you see parts?	can it be separated?
substance b	yes	yes
substance c	no	no

○ substance a
○ substance b
○ substance c
○ substance b and c

Explanation:

Step1: Recall pure substance properties

A pure substance (element or compound) has uniform composition, so no visible parts, and can't be separated by physical means. Mixtures have visible parts (heterogeneous) or uniform but separable (homogeneous).

Step2: Analyze each substance

• Substance A: No visible parts, but can be separated (so homogeneous mixture, not pure).
• Substance B: Visible parts (heterogeneous mixture, not pure).
• Substance C: No visible parts, can't be separated (matches pure substance definition).

Answer:

Substance C