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Across 3. A compound that has only carbon and hydrogen 5. Formula displaying the number of atoms in each element 6. Formula displaying only the carbon 'skeleton' 9. Where the same atoms are joined to each other in different spatial arrangements 10. Formula displaying all the bonds and atoms 11. An atom or group of atoms that define a hydrocarbon and its reactions (e.g. the -OH in alcohols) (2 Words) 12. Formula showing how atoms are joined together in a molecule

Down 1. Formula specific to different homologous series (e.g twice as many H than C in alkenes) 2. Hydrocarbons with the same functional group but different chain lengths (2 Words) 4. In C=C double bonds, these isomers are possible when one H atom is attached to each carbon of the double bond (2 Words) 7. The simplest whole-number ratio of elements in a compound 8. Has the same molecular formula but different structural formulae