Chemistry - Syllabus Questions 3.0 / 5 based on 1 rating ? ChemistryIGCSEAll boards Created by: Claudia ChakmatiCreated on: 17-05-13 00:57 What is an atom? An atom is the smallest particle in an element that is still that element 1 of 12 Name all the four methods of separation and purification Distillation, Crystallisation, Filtration and Fractional Distillation 2 of 12 Define solvent, solute and solution Solvent - Liquid that will do the dissolving. Solute - Material that will dissolve the solvent. Solution - Solvent with a solute dissolved in it. 3 of 12 Name 2 differences on physical and chemical changes Physical Changes - easily reversible, temporary colour change. Chemical Changes - irreversible, permanent colour change. 4 of 12 Define Isotopes Isotopes are the same element, with the same number of protons and electrons but different number of neutrons 5 of 12 Describe the Lattice Structure of Ionic Compounds Regular arrangement of alternating positive and negative ions, brittle, conducts electricity when in solution, high melting/boiling points 6 of 12 What is Covalent Bonding? The sharing of electrons between non-metallic elements in the outer shell. Can be a double sharing of electrons, triple etc. 7 of 12 Describe neutrality and relative acidity and alkalinity in terms of pH From pH 7 and down - acid. pH 7 - neutral. From pH 7 and up - alkali 8 of 12 The Halogens are from what Group number? Group 7 - Group VII 9 of 12 Why don't the Noble Gases use covalent bonding nor ionic bonding? Their outer shells are already fully complete 10 of 12 What does malleable mean? Can change its shape (The Alkali Metals are all malleable) 11 of 12 What is the name for the process of making ammonia? Haber Process 12 of 12
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