Chemistry 0.0 / 5 ? ChemistryGCSEEdexcel Created by: PhoebeCreated on: 28-03-13 20:12 What is the relative atomic mass (Ar)? The weighted mean mass of an atom of an element relative to one-twelfth the mass of an atom of carbon-12. 1 of 8 What is the relative formula mass (Mr)? The sum of the relative atomic masses of all the atoms present in the formula of a substance. 2 of 8 What experiments can be done to show diffusion in gases? Ammonia and hydrogen chloride experiment and bromine gas experiment. 3 of 8 What experiment can be done to show diffusion in liquids? Potassium manganate VII experiment. 4 of 8 What is a molecule? The Smallest particle of a substance that can have a separate, individual existence. 5 of 8 What are monatomic molecules? Molecules that only contain one atom. 6 of 8 What is an atom? The smallest particle if an element that can take part in chemical reactions. 7 of 8 What is an element? A substance made up of atoms that all contain the same amount of protons. 8 of 8
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