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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Glossary of chemistry terms | 20/20 | https://en.wikipedia.org/wiki/Glossary_of_chemistry_terms | reference | science, encyclopedia | 2026-05-05T07:59:20.572989+00:00 | kb-cron |
zone melting Any of several methods of purifying crystalline solids which involve applying heat to a small region of a larger solid (particularly a metal ingot) until localized melting occurs, creating a molten zone which is then slowly moved along the surface to other parts of the solid by moving the target of the heating element. As it moves, the forward edge of the molten zone continuously melts new areas of impure solid, while leaving a path of purer solid behind it as previously melted areas are cooled and resolidified; because the molten liquid phase can hold a higher concentration of impurities than the solid phase, the impurities of melted areas tend to concentrate in the molten zone and be carried along as it moves, leaving behind regions with fewer impurities. The process is commonly used in the refinement of high-purity metalloids for use in semiconductors.
zinc A metallic chemical element with atomic number 30 and symbol Zn.
zwitterion Also inner salt and dipolar ion. Any molecule that contains an internal polarity by virtue of having an equal number of positively charged and negatively charged functional groups.
== See also == Outline of chemistry Index of chemistry articles List of chemical elements Glossary of areas of mathematics Glossary of biology Glossary of engineering Glossary of physics
== References ==
== External links == IUPAC Compendium of Chemical Terminology