C4 - Purifying and Testing Water 0.0 / 5 ? SciencePurifying and Testing WaterGCSEOCR Created by: kaliSereneCreated on: 12-06-16 15:55 What are the three main stages in water purification? Sedimentation, filtration and chlorination 1 of 9 What happens in sedimentation? Chemicals are added to make solid particles and bacteria settle out. 2 of 9 What happens in filtration? A layer of sand on gravel filters out the remaining fine particles; some types of sand filter also remove microbes 3 of 9 What happens in chlorination? Chlorine is added to kill microbes 4 of 9 How does the purification of water increase global warming? Because it takes energy to pump and purify 5 of 9 How can dissolved substances in water be removed? By distillation 6 of 9 What is the problem with distillation? Takes huge amounts of energy, so it very expensive and it is only used when there is no fresh water 7 of 9 How can water be tested? With precipitation reactions using aqueous silver nitrate and barium chloride solutions 8 of 9 What is a precipitation reaction? Two solutions react to form a chemical that does not dissolve. 9 of 9
CHEMISTRY- metals, limestone, fuels, building materials BIOLOGY- reflex and sensory, menstrual hormones, 0.0 / 5
GCSE Chemistry C5- OCR 21st century Science Printable revision cards 5.0 / 5 based on 1 rating Teacher recommended
Comments
No comments have yet been made