Common names can be confusing when naming compounds Inaccurate and provides no hint of elements...
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Transcript of Common names can be confusing when naming compounds Inaccurate and provides no hint of elements...
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6.2 Names and Formulas of Common Compounds
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Common Names and Chemical Names
Common names can be confusing when naming compounds
Inaccurate and provides no hint of elements present
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Chalk
writing chalk (calcium sulfate)
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Antacids (calcium carbonate) – also in sea shells, snail shells, eggshells
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Every compound has a name and formula
Chemical formula – identifies which elements, and how much of each are in the compound
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Ion Charges
Ion notation – element symbol with a superscript and a + or – sign at the top right
Some metals are able to form more than one type of ion (have more than one charge)
A Roman number is included in the ion name to show the ion charge
(I) = 1 (II) = 2 (III) = 3 (IV) = 4
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Non-metals Name of non-metal changes to ‘ide’ at
the end
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Naming Ionic Compounds
Rules 1) Name the metal ion first (simply the
element name). **If an element can form more than one
kind of ion, include the Roman number to indicate the charge.
2) Name the non-metal second. Change the ending to ‘ide’.
**subscripts (small #) are ignored for naming compounds
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Multivalent Elements
For elements that can make more than one ion
You can find the Roman # to use by using the subscripts in the formula
This is written in the middle of the compound name
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Writing Formulas for Ionic Compounds
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