Chemical Names and Formulas: Flashcards

Chemical Names and Formulas: Flashcards

1. Question

   How do you tell an ionic compound from a molecular one by its formula?

   Answer

   Ionic: contains a metal (or $\ce{NH4+}$). Molecular: non-metals only.

2. Question

   Give the formula and charge of the sulfate, nitrate, carbonate and hydroxide ions.

   Answer

   $\ce{SO4^2-}$, $\ce{NO3-}$, $\ce{CO3^2-}$, $\ce{OH-}$

3. Question

   Give the formula and charge of the ammonium and phosphate ions.

   Answer

   $\ce{NH4+}$ and $\ce{PO4^3-}$

4. Question

   Write the formula of aluminium oxide.

   Answer

   $\ce{Al2O3}$: 2 × (+3) + 3 × (−2) = 0

5. Question

   Write the formula of calcium hydroxide.

   Answer

   $\ce{Ca(OH)2}$: brackets because there are two hydroxide ions.

6. Question

   Name $\ce{FeCl3}$.

   Answer

   Iron(III) chloride: three $\ce{Cl-}$ give −3, so iron is +3.

7. Question

   What does -ide mean, and what does -ate mean?

   Answer

   -ide: an anion of one element (chloride, oxide). -ate: a polyatomic anion containing oxygen (sulfate, nitrate).

8. Question

   List the Greek prefixes from 1 to 6.

   Answer

   mono, di, tri, tetra, penta, hexa

9. Question

   Name $\ce{N2O5}$ and $\ce{CO}$.

   Answer

   Dinitrogen pentoxide; carbon monoxide (no "mono" on the first element).

10. Question

    Give the formulas of hydrochloric, nitric and sulfuric acid.

    Answer

    $\ce{HCl}$, $\ce{HNO3}$, $\ce{H2SO4}$

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