CHEM 1 DEFINITIONS Various definitions needed for AS unit CHEM 1 according to the AQA exam board. 4.0 / 5 based on 4 ratings ? ChemistryASAll boards Created by: Former MemberCreated on: 22-03-11 19:26 ATOMIC NUMBER THE NUMBER OF PROTONS IN THE NUCLEUS OF AN ATOM. 1 of 9 CATALYTIC CRACKING OCCURS WHEN THE ENERGY REQUIRED FOR BOND BREAKING IN HYDROCARBONS IS PROVIDED BY HEAT, IN THE PRESENCE OF A CATALYST. 2 of 9 CO-ORDINATE BOND A COVALENT BOND FORMED WHEN THE PAIR OF ELECTRONS ORIGINATE FROM ONE ATOM. 3 of 9 COVALENT BOND A SHARED PAIR OF ELECTRONS. 4 of 9 CRACKING OCCURS WHEN LARGE ALKANES ARE BROKEN INTO SMALLER MOLECULES. 5 of 9 DISPLAYED FORMULA SHOWS ALL THE BONDS PRESENT IN A MOLECULE. 6 of 9 ELECTRONEGATIVITY THE POWER OF AN ATOM TO ATTRACT THE SHARED PAIR OF ELECTRONS IN A COVALENT BOND. 7 of 9 EMPIRICAL FORMULA THE SIMPLEST RATIO OF ATOMS OF EACH ELEMENT IN A COMPOUND. 8 of 9 ENTHALPY CHANGE THE AMOUNT OF HEAT ENERGY RELEASED OR ABSORBED WHEN A CHEMICAL OR PHYSICAL CHANGE OCCURS AT CONSTANT PRESSURE. 9 of 9
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