Atoms 0.0 / 5 ? ChemistryAtoms and compoundsIGCSEEdexcel Created by: Will.I.am J BentleyCreated on: 28-02-16 12:56 Who thought of particles in 1805? John Dalton 1 of 20 Could the atoms join together to make a new substances? Yes 2 of 20 Why is it difficult to describe atoms? They are too smal 3 of 20 How many atoms are in our body? 26 4 of 20 How can scientists measure very small forces? They use probes to detect particles and reposition them (atomic force microscopes) 5 of 20 What is a molecule? A group of 2 or more atoms bonded together 6 of 20 How can we use dilution of coloured solutions to detect atoms? When a solute (the dissolved substance in solution) is dissolved in a solvent 7 of 20 What is diffusion? When a gas moves freely from an area of high concentration to low concentration 8 of 20 How can we use diffusion to investigate particles? Wait, for five minutes, for the bromine gas to diffuse from its flask to the other 9 of 20 What will the experiment show? Both air and bromine particles are moving randomly and there re large gaps between the particles: therefore, they can easily mix together 10 of 20 What is an atom? The smallest particle of an element 11 of 20 What is an element? A pure substance that is listed on the Periodic Table and has only one type of atom 12 of 20 What is a compound? A pure substance made from more than one type of element, after being chemically bonded 13 of 20 What is a mixture? An impure substance made from different elements or compounds 14 of 20 What is distillation? The separation of a liquid from a solution 15 of 20 What is fractional distillation? To separate two or more liquids that are miscible with one another 16 of 20 What is filtration? The separation of an undissolved solid from a mixture of the solid and a liquid/solution 17 of 20 What is crystallisation? The separation of a dissolved solid from a solution, when the solid is much more soluble in hot solvent than in cold 18 of 20 What is paper chromatography? The separation of substances that have different solubilities in a given solvent 19 of 20 How can information from chromatograms be used to identify the composition of a mixture Calculate the distance moved by the compound/the distance moved by the solvent 20 of 20
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