Science Flashcards 2 2.0 / 5 based on 1 rating ? ScienceGCSEOCR Created by: FeeCreated on: 15-04-13 15:39 Two properties of alkalis turns litmus paper blue & neutralise acid soil and usedto make glass 1 of 9 sodium carbonate+ sulfuric acid -> sodium sulfate + water + carbon dioxide 2 of 9 Why does recyling lead batteries reduce pollution? recyling lead batteries reduces the need for processing or mining new land 3 of 9 The three diffferent chemical elements in PVC are... Carbon , chlorine and hydrogen 4 of 9 PVC can be made softer by adding small molecules called.. Plasticisers 5 of 9 A full LCA (life cycle assessment) is not always given. Why? LCA is not always posible because of insuffienct data (hard to measure some aspects. 6 of 9 A light year is about 1 X 10 km. Why? Light has a speed of 3000,000 km/s ; A light-year is how far light goes in a year; this is 3000,000 X60 X 60 X 24 X 365 = 9.46 X 10 km 7 of 9 Where does the sun get its energy from? The energy comes from fusion of hydrogen 8 of 9 After the big bang the Universe started to contain different elements. Where did they come from? Nuclear fusion in stars forces hydrogen atoms together to make helium. The heaviest elements are made when a star explodes at the end of its lifetime 9 of 9
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