GCSE Chemistry Revision notes 2020/2021 - S-cool

GCSE Chemistry Revision notes 2020/2021 ... We are surrounded by low-level radiation from rocks and cosmic rays called background radiation. ... First created in 2000 and updated in 2013, 2015 & 2020. 8 Acids and Alkalis Acids are a group of chemicals that taste sour, turn litmus paper red and react with metals to form salts. ................
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