Chemistry Definitions 0.0 / 5 ? ChemistryEnthalpyASEdexcel Created by: ryanh2197Created on: 14-01-14 20:54 49265731810 Across 1. The number of atoms in exactly 12 grams of Carbon-12 (8, 8) 5. The smallest particle of a chemical element that can exist (4) 6. The enthalpy change for a reaction is independent to the route taken between products and reactants (5, 3) 8. A pure substance that cannot be broken down chemically into anything simpler (7) 10. The relative molecular or formula mass in grams per mole (5, 4) Down 2. Something that is composed of two or more separate elements (8) 3. A charged atom or charged group of atoms (3) 4. The heat exchanged by a reaction at constant pressure (8, 6) 7. The distortion of the negative ion as a result of the electrons being attracted by the positive ion (12) 9. The exact number of different atoms in one molecule of a compound (9, 7)
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