CHEMISTRY PAPER 1 0.0 / 5 ? ChemistryAtomsGCSEAQA Created by: IJM22Created on: 07-05-19 19:56 Define element? When all the atoms are the same 1 of 18 What is the symbol for Magneisum? Mg 2 of 18 What is the symbol for Sulfur? S 3 of 18 What is a compound? Where it contains two or more different elements chemically combined in a fixed proportion 4 of 18 Give an example of a compound? Magnesium sulfide 5 of 18 Name a key fact about compounds? They usually have totally different properties to the elements that they're made from 6 of 18 What is a mixture? Where there are different elements or compounds not chemically combined together 7 of 18 How do you separate a mixture? By using a physical technique e.g. filtration or distilation 8 of 18 What is a molecule? Any elements chemically joined 9 of 18 What happened in 1897? Scientists discovered that atoms contain tiny negative particles called electrons 10 of 18 Why was the discovery in 1897 a big thing? As it showed that atoms are not spheres that cannot be divided - they have an internal structure 11 of 18 What did the plum-pudding model suggest? That atoms are a ball of positve charge with negative electrons embedded in it 12 of 18 What did scientists replace the plum pudding with? The nuclear model 13 of 18 What is the smaller number called in a symbol? Atomic number 14 of 18 What is the larger number called? The mass number 15 of 18 How do you work out the number of neutrons? Subtract the Mass number and Atomic number 16 of 18 Define Isotopes? Atoms of an element with different numbers of neutrons 17 of 18 What is it called when a solid changes to a liquid? Melting 18 of 18
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