Chem 2.1 Hard Water 3.0 / 5 based on 1 rating ? ChemistryWater hardness and solubilityGCSEAQA Created by: DanCreated on: 10-04-13 09:24 Water that lathers easily with soap is said to be called? Soft water 1 of 11 Why is hard water inefficient? Hard water uses more soap to produce lather and wash effectively 2 of 11 How is scum produced? Dissolved compounds react with soap to form scum 3 of 11 How do dissolved compounds get in to the water? When water passes through rocks, compounds from rock can dissolve into water 4 of 11 What compounds will create scum in the water? Calcium and Magnesium ions 5 of 11 State the symbols and ionic charge Ca2+ and Mg2+ 6 of 11 How is scale produced? When temporary hard water is heated, an insoluble product called scale is produced 7 of 11 What is bad about scale? It can clog up appliances and reduce efficiency for example, a kettle 8 of 11 How is calcium good for us? Helps develop strong bones and teeth, reduces risk of heart disease 9 of 11 What is the difference between scum and scale? Scum is formed when soap reacts with compounds in hard water, scale is formed when temporary hard water is boiled 10 of 11 Why is it better to drink hard water rather than soft? Hard water has minerals in it that contribute to a healthy diet 11 of 11
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