Chemistry unit A 3.0 / 5 based on 1 rating ? ScienceChemistryGCSEAQA Created by: tahmidaCreated on: 30-12-12 19:58 What is in the middle of the atom? The Nucleus 1 of 15 How are protons and Neutrons charged? protons= positively charged Neutrons= no charge 2 of 15 How are electrons charged? They are negatively charged 3 of 15 How many atoms does elements consist of? one 4 of 15 what is this symbol 'Mg'? Magnesium 5 of 15 How many electrons are aloud in each shell? 1= 2 electrons, 2= 8 electrons, 3=8 etc 6 of 15 What happens when different elements react? atoms form a chemical bonds 7 of 15 What happens in chemical reactions to atoms? Atoms aren't lost or made 8 of 15 What is the equation for limestone? calcium carbonate-->calcium oxide+carbon dioxide 9 of 15 what is the equation when acid is reacted? calcium carbonate+sulfuric acid--> calcium sulfate+carbon dioxide+water 10 of 15 What is the equation for limestone when reacted with water? calcium oxide+ water--->calcium hydroxide 11 of 15 What are the disadvantage's on quarrying limestone? noisy, and dusty and ruins landscapes 12 of 15 What are the advantages of quarrying limestone? you get dyes,paints, medicines and neutralise's acidic soil 13 of 15 state one advantage and disadvantage of limestone's products? pro- widely available con-some are very unattractive 14 of 15 why is recycling metals important? fossil fuels will run out soon 15 of 15
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