Identifying Pure Substances 10-Mark Quiz

In science, a pure substance is best described as…

Which result suggests a substance is pure when it melts?

If a sample melts over a temperature range, this usually means…

In chromatography, a pure substance usually produces…

Why is the start line in paper chromatography drawn in pencil?

Which statement about “pure orange juice” is correct in the scientific sense?

When measuring temperature accurately with a thermometer, the bulb should…

What can impurities do to melting/boiling behaviour?

Which chromatogram result most strongly suggests the sample is a mixture?

Which graph feature on a heating curve shows a pure substance changing state at a fixed temperature?