Flashcard: Understanding Purity in Substances — 10 carte

Pure substance — definition?

Contains only one element or compound.

Impure substance — role?

Contains a mixture of different substances.

Recognising purity — method?

Use melting and boiling point analysis.

Apparatus for filtration — components?

Filter paper and funnel.

Apparatus for evaporation — purpose?

To remove solvent and recover solids.

Pure water — melting point?

0°C, sharp and specific.

Impure sample — melting point?

Broader range, usually lower than pure.

Mixture — separation technique?

Physical methods exploiting physical differences.

Filtration — residue?

Solid left on filter paper.

Evaporation — process?

Heating solution to vaporize solvent.