Flashcards : Understanding Purity in Substances — 10 cartes

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1Question

Pure substance — definition?

Réponse

Contains only one element or compound.

2Question

Impure substance — role?

Réponse

Contains a mixture of different substances.

3Question

Recognising purity — method?

Réponse

Use melting and boiling point analysis.

4Question

Apparatus for filtration — components?

Réponse

Filter paper and funnel.

5Question

Apparatus for evaporation — purpose?

Réponse

To remove solvent and recover solids.

6Question

Pure water — melting point?

Réponse

0°C, sharp and specific.

7Question

Impure sample — melting point?

Réponse

Broader range, usually lower than pure.

8Question

Mixture — separation technique?

Réponse

Physical methods exploiting physical differences.

9Question

Filtration — residue?

Réponse

Solid left on filter paper.

10Question

Evaporation — process?

Réponse

Heating solution to vaporize solvent.

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1. When was melting point analysis established as a routine method for assessing the purity of substances in chemistry?

2. Who is credited with proposing the method of recognising purity through melting point analysis?

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