AS Chemistry Unit 1 (OCR) Test your knowledge on unit 1 AS chemistry! (For OCR exam board) 4.5 / 5 based on 9 ratings ? ChemistryBonding & shapesASOCR Created by: Lucy CarrCreated on: 02-01-13 12:40 The weighted mean mass of an atom of an element compared with 1/12 of the mass of an atom of carbon-12. Relative atomic mass 1 of 10 The energy required to remove electrons from an atom Ionisation energy 2 of 10 The simplest whole number ratio of elements in a compound. Empirical formulae 3 of 10 Solutions of low concentration can be described as... Dilute 4 of 10 A bond between shared pairs of electrons Covalent 5 of 10 The electrostatic attraction between oppositely charged ions. Ionic bond 6 of 10 Shape of a molecule containing four bonding pairs and zero lone pairs Tetrahedral 7 of 10 A measure of the ability of an atom to attract the bonding electrons in a covalent bond. Electronegativity 8 of 10 Weak attractive forces between molecules Intermolecular forces 9 of 10 A substance which is less dense than water and has a high surface tension Ice 10 of 10
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